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The following commit(s) were added to refs/heads/master by this push:
new 946bd2b36e7 boards/risc-v/esp32c3: add Waveshare ESP32-C3-Zero
946bd2b36e7 is described below
commit 946bd2b36e7790fcc33b4151b937a2ac3a095661
Author: simbit18 <[email protected]>
AuthorDate: Mon Dec 15 17:08:00 2025 +0100
boards/risc-v/esp32c3: add Waveshare ESP32-C3-Zero
- Add initial support for Waveshare ESP32-C3-Zero.
Signed-off-by: simbit18 <[email protected]>
---
.../esp32c3/boards/esp32-c3-zero/ESP32-C3-Zero.jpg | Bin 0 -> 19861 bytes
.../risc-v/esp32c3/boards/esp32-c3-zero/index.rst | 285 +++++++++++
boards/Kconfig | 13 +
.../esp32c3/common/include/esp_board_bmp280.h | 76 +++
boards/risc-v/esp32c3/common/src/Make.defs | 4 +
.../risc-v/esp32c3/common/src/esp_board_bmp280.c | 94 ++++
boards/risc-v/esp32c3/esp32-c3-zero/Kconfig | 8 +
.../esp32c3/esp32-c3-zero/configs/jumbo/defconfig | 61 +++
.../esp32c3/esp32-c3-zero/configs/nsh/defconfig | 45 ++
.../esp32-c3-zero/configs/sta_softap/defconfig | 83 +++
.../esp32c3/esp32-c3-zero/configs/usbnsh/defconfig | 45 ++
.../esp32c3/esp32-c3-zero/configs/wifi/defconfig | 79 +++
.../risc-v/esp32c3/esp32-c3-zero/include/board.h | 41 ++
.../risc-v/esp32c3/esp32-c3-zero/scripts/Make.defs | 61 +++
boards/risc-v/esp32c3/esp32-c3-zero/src/Make.defs | 45 ++
.../esp32c3/esp32-c3-zero/src/esp32-c3-zero.h | 121 +++++
.../esp32c3/esp32-c3-zero/src/esp32c3_appinit.c | 83 +++
.../esp32c3/esp32-c3-zero/src/esp32c3_boot.c | 89 ++++
.../esp32c3/esp32-c3-zero/src/esp32c3_bringup.c | 492 ++++++++++++++++++
.../esp32c3/esp32-c3-zero/src/esp32c3_buttons.c | 200 ++++++++
.../esp32c3/esp32-c3-zero/src/esp32c3_gpio.c | 558 +++++++++++++++++++++
.../esp32c3/esp32-c3-zero/src/esp32c3_reset.c | 83 +++
22 files changed, 2566 insertions(+)
diff --git
a/Documentation/platforms/risc-v/esp32c3/boards/esp32-c3-zero/ESP32-C3-Zero.jpg
b/Documentation/platforms/risc-v/esp32c3/boards/esp32-c3-zero/ESP32-C3-Zero.jpg
new file mode 100644
index 00000000000..e5f18825445
Binary files /dev/null and
b/Documentation/platforms/risc-v/esp32c3/boards/esp32-c3-zero/ESP32-C3-Zero.jpg
differ
diff --git
a/Documentation/platforms/risc-v/esp32c3/boards/esp32-c3-zero/index.rst
b/Documentation/platforms/risc-v/esp32c3/boards/esp32-c3-zero/index.rst
new file mode 100644
index 00000000000..6f3905877bd
--- /dev/null
+++ b/Documentation/platforms/risc-v/esp32c3/boards/esp32-c3-zero/index.rst
@@ -0,0 +1,285 @@
+===============================
+Waveshare ESP32-C3-Zero
+===============================
+
+.. tags:: chip:ESP32-C3
+
+The `Waveshare ESP32-C3-Zero <https://www.waveshare.com/wiki/ESP32-C3-Zero>`_
is a compact development board supplied by Waveshare.
+
+.. figure:: ESP32-C3-Zero.jpg
+ :align: center
+
+Features
+========
+
+* Low-power RISC-V 32-bit Single-core processor, up to 160MHz main frequency.
+* Supports 2.4GHz Wi-Fi (802.11 b/g/n) and Bluetooth® 5 (LE).
+* 400KB SRAM, 384KB ROM and built-in 4MB flash memory.
+* 15 multi-function GPIO pins.
+* 3× SPI, 1× I2C, 2× UART, 1× I2S, 2× ADC.
+* Onboard WS2812 RGB led.
+* Compact SMD ceramic antenna.
+* Ultra-compact size: 23.5 × 18 mm
+
+Buttons and LEDs
+================
+
+There are two buttons labeled BOOT and RESET.
+The BOOT button is connected to GPIO9. On reset it is used as a strapping pin
to determine whether the chip boots normally or into the serial bootloader.
After reset, however, the BOOT button can be used for software input.
+
+WS2812 LED is connected to GPIO10 and is available for software.
+
+Pin Mapping
+===========
+
+Pads numbered anticlockwise from USB connector.
+
+===== ========== ==========
+Pad Signal Notes
+===== ========== ==========
+1 5V +5V Supply to board
+2 GND Ground
+3 3V3 Power output to peripherals
+4 GPIO0
+5 GPIO1
+6 GPIO2
+7 GPIO3
+8 GPIO4 SCK (bit-banging)
+9 GPIO5 MISO (bit-banging)
+10 GPIO6 MOSI (bit-banging)
+11 GPIO7 CSn (bit-banging)
+12 GPIO8 SCL (bit-banging)
+13 GPIO9 SDA (bit-banging)
+14 GPIO10 To connect with WS2812 RGB LED
+15 GPIO18 USB_D+
+16 GPIO19 USB_D-
+17 GPIO20 Default RX for UART0 serial console
+18 GPIO21 Default TX for UART0 serial console
+===== ========== ==========
+
+.. note:: The Waveshare ESP32-C3-Zero does not have dedicated I2C and SPI pins.
+ However, you can implement software-based I2C or SPI (bit-banging) using
any available GPIO pins.
+
+
+Power Supply
+============
+
+There are two mutually exclusive ways to provide power to the board:
+
+* USB Type-C Port
+
+* supplying via VIN (5V) pin (3.3–6 V) and GND pin headers
+
+
+
+Installation & Build
+====================
+
+For instructions on how to to install the build dependencies and create a NuttX
+image for this board, consult the main :doc:`ESP32-C3 documentation
+<../../index>`.
+
+Serial Console
+==============
+
+A **USB Serial Adapter** is required to run NuttX on ESP32-C3-Zero with UART0
serial console.
+
+Connect the USB Serial Adapter to ESP32-C3-Zero Serial Console at:
+
+.. list-table:: USB Serial connections
+ :widths: auto
+ :header-rows: 1
+
+ * - USB Serial
+ - ESP32-C3-Zero Pin
+ * - GND
+ - GND (Pin 2)
+ * - RX
+ - GPIO21 (UART0 TX) (Pin 18)
+ * - TX
+ - GPIO20 (UART0 RX) (Pin 17)
+
+A USB serial adapter with **+3.3V TTL level** UART signals is required.
+
+Connect ESP32-C3-Zero to our computer with the USB Serial Adapter.
+On our computer, start a Serial Terminal and connect to the USB Serial Port
+at **115200 bps**.
+
+NuttX will appear in the Serial Console when it boots on ESP32-C3-Zero.
+
+Configurations
+==============
+
+All configurations listed below can be configured using the following command
in
+the ``nuttx`` directory (again, consult the main :doc:`ESP32-C3 documentation
+<../../index>`):
+
+.. code:: console
+
+ $ ./tools/configure.sh esp32-c3-zero:<config_name>
+
+where <config_name> is the name of board configuration you want to use, i.e.:
nsh, usbnsh, wifi...
+
+.. list-table:: Build System
+ :widths: auto
+ :header-rows: 1
+
+ * - Build System
+ - Support
+ * - Make
+ - Yes
+ * - CMake
+ - No
+
+.. code:: console
+
+ $ make flash ESPTOOL_PORT=/dev/ttyUSB0 -j
+
+Then use a serial console terminal like ``picocom`` configured to **115200
8N1**.
+
+jumbo
+----------
+
+This configuration enables many Apache NuttX features (console enabled in
UART0, at **115200** bps).
+This is mostly to help provide additional code coverage in CI, but also allows
for a users
+to see a wide range of features that are supported by the OS.
+
+
+**I2C**
+
+The I2C Tool can be used to scan and manipulate I2C devices.
+You can scan for all I2C devices using the following command::
+
+ nsh> i2c dev -b 3 00 77
+ NOTE: Some devices may not appear with this scan.
+ You may also try a scan with the -z flag to discover more devices using a
zero-byte write request.
+ 0 1 2 3 4 5 6 7 8 9 a b c d e f
+ 00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
+ 70: -- -- -- -- -- -- 76 --
+ nsh>
+
+.. tip:: Please refer to :doc:`I2C Tool </applications/system/i2c/index>`
+ for more information.
+
+**SPI**
+
+The SPI Tool provides a way to debug SPI related problems.
+You can test it by connecting MOSI and MISO pins which are GPIO6 and GPIO5
+by default to each other and running the ``spi`` example::
+
+ nsh> spi exch -b 3 "AB"
+ Sending: AB
+ Received: AB
+
+.. tip:: Please refer to :doc:`SPI Tool </applications/system/spi/index>`
+ for more information.
+
+**bmp280**
+
+You can check that the Bosch BMP280 sensor over I2C is working by using the
:doc:`bmp280 </applications/examples/bmp280/index>` application:
+
+.. list-table:: BMP280 connections
+ :widths: auto
+ :header-rows: 1
+
+ * - BMP280
+ - ESP32-C3-Zero Pin
+ * - VCC
+ - 3V3 OUT (Pin 3)
+ * - GND
+ - GND (Pin 2)
+ * - SCL
+ - GPIO8 (SCL) (Pin 12)
+ * - SDA
+ - GPIO9 (SDA) (Pin 13)
+
+.. code-block:: console
+
+ nsh> bmp280
+ Absolute pressure [hPa] = 1003.359985
+ Temperature [C] = 18.969999
+
+**sensortest**
+
+You can check that the Bosch BMP280 sensor over I2C is working by using the
``sensortest`` application:
+
+.. code-block:: console
+
+ nsh> sensortest -n 10 baro0
+ SensorTest: Test /dev/uorb/sensor_baro0 with interval(1000000us),
latency(0us)
+ baro0: timestamp:3449690000 value1:1023.23 value2:19.75
+ baro0: timestamp:3449690000 value1:1023.23 value2:19.75
+ baro0: timestamp:3449690000 value1:1023.23 value2:19.75
+ baro0: timestamp:3449690000 value1:1023.23 value2:19.75
+ baro0: timestamp:3449690000 value1:1023.23 value2:19.75
+ baro0: timestamp:3449700000 value1:1023.23 value2:19.75
+ baro0: timestamp:3449700000 value1:1023.23 value2:19.75
+ baro0: timestamp:3449710000 value1:1022.82 value2:19.86
+ baro0: timestamp:3449710000 value1:1022.82 value2:19.86
+ baro0: timestamp:3449720000 value1:1022.82 value2:19.86
+ SensorTest: Received message: baro0, number:10/10
+ nsh>
+
+nsh
+---
+
+Basic configuration that runs NuttShell (console enabled in UART0, at **115200
bps**).
+This configuration is focused on low level, command-line driver testing.
+Built-in applications are supported, but none are enabled.
+
+.. tip:: Please refer to :doc:`NuttShell (NSH) </applications/nsh/index>`
+ for more information.
+
+sta_softap
+----------
+
+With this configuration you can run these commands to be able
+to connect your smartphone or laptop to your board::
+
+ nsh> ifup wlan1
+ nsh> dhcpd_start wlan1
+ nsh> wapi psk wlan1 mypasswd 3
+ nsh> wapi essid wlan1 nuttxap 1
+
+In this case, you are creating the access point ``nuttxapp`` in your board and
to
+connect to it on your smartphone you will be required to type the password
``mypasswd``
+using WPA2.
+
+.. tip:: Please refer to :ref:`ESP32 Wi-Fi SoftAP Mode <esp32_wi-fi_softap>`
+ for more information.
+
+The ``dhcpd_start`` is necessary to let your board to associate an IP to your
smartphone.
+
+usbnsh
+------
+
+Basic NuttShell configuration using CDC/ACM serial (console enabled in USB
Port, at **115200 bps**).
+This is another NSH example. If differs from other ‘nsh’ configurations in
that this configurations
+uses a USB serial device for console I/O.
+
+wifi
+----
+
+Enables Wi-Fi support. You can define your credentials this way::
+
+ $ make menuconfig
+ -> Application Configuration
+ -> Network Utilities
+ -> Network initialization (NETUTILS_NETINIT [=y])
+ -> WAPI Configuration
+
+Or if you don't want to keep it saved in the firmware you can do it
+at runtime::
+
+ nsh> wapi psk wlan0 mypasswd 3
+ nsh> wapi essid wlan0 myssid 1
+ nsh> renew wlan0
+
+.. tip:: Please refer to :ref:`ESP32 Wi-Fi Station Mode <esp32_wi-fi_sta>`
+ for more information.
diff --git a/boards/Kconfig b/boards/Kconfig
index 04e8d823a48..b9c76f80693 100644
--- a/boards/Kconfig
+++ b/boards/Kconfig
@@ -438,6 +438,15 @@ config ARCH_BOARD_ESP32C3_XIAO
The XIAO-ESP32C3 from Seeed Studio features the ESP32-C3 CPU
with a RISC-V core,
supporting IEEE 802.11 b/g/n WiFi, and Bluetooth 5 (BLE)
protocols.
+config ARCH_BOARD_ESP32_C3_ZERO
+ bool "Waveshare ESP32-C3-Zero"
+ depends on ARCH_CHIP_ESP32C3
+ select ARCH_HAVE_BUTTONS
+ select ARCH_HAVE_IRQBUTTONS
+ ---help---
+ The ESP32-C3-Zero from Waveshare features the ESP32-C3 CPU with
a RISC-V core,
+ supporting IEEE 802.11 b/g/n WiFi, and Bluetooth 5 (BLE)
protocols.
+
config ARCH_BOARD_ESP32S2_KALUGA_1
bool "Espressif ESP32-S2-Kaluga-1 V1.3"
depends on ARCH_CHIP_ESP32S2WROVER
@@ -3537,6 +3546,7 @@ config ARCH_BOARD
default "esp32c3-legacy-devkit-rust-1" if
ARCH_BOARD_ESP32C3_LEGACY_DEVKIT_RUST1
default "esp32c3-legacy-devkit" if
ARCH_BOARD_ESP32C3_LEGACY_DEVKIT
default "esp32c3-xiao" if ARCH_BOARD_ESP32C3_XIAO
+ default "esp32-c3-zero" if ARCH_BOARD_ESP32_C3_ZERO
default "esp32s2-kaluga-1" if ARCH_BOARD_ESP32S2_KALUGA_1
default "esp32s2-saola-1" if ARCH_BOARD_ESP32S2_SAOLA_1
default "franzininho-wifi" if ARCH_BOARD_FRANZININHO_WIFI
@@ -4793,6 +4803,9 @@ endif
if ARCH_BOARD_ESP32C3_XIAO
source "boards/risc-v/esp32c3/esp32c3-xiao/Kconfig"
endif
+if ARCH_BOARD_ESP32_C3_ZERO
+source "boards/risc-v/esp32c3/esp32-c3-zero/Kconfig"
+endif
if ARCH_BOARD_ESP32S2_KALUGA_1
source "boards/xtensa/esp32s2/esp32s2-kaluga-1/Kconfig"
endif
diff --git a/boards/risc-v/esp32c3/common/include/esp_board_bmp280.h
b/boards/risc-v/esp32c3/common/include/esp_board_bmp280.h
new file mode 100644
index 00000000000..8ead77a14e4
--- /dev/null
+++ b/boards/risc-v/esp32c3/common/include/esp_board_bmp280.h
@@ -0,0 +1,76 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/common/include/esp_board_bmp280.h
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_RISCV_ESP32C3_COMMON_INCLUDE_ESP_BOARD_BMP280_H
+#define __BOARDS_RISCV_ESP32C3_COMMON_INCLUDE_ESP_BOARD_BMP280_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_bmp280_initialize
+ *
+ * Description:
+ * Initialize and register the BMP280 Pressure Sensor driver.
+ *
+ * Input Parameters:
+ * devno - The device number, used to build the device path as /dev/pressN
+ *
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SENSORS_BMP280
+int board_bmp280_initialize(int devno);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __BOARDS_RISCV_ESP32C3_COMMON_INCLUDE_ESP_BOARD_BMP280_H */
diff --git a/boards/risc-v/esp32c3/common/src/Make.defs
b/boards/risc-v/esp32c3/common/src/Make.defs
index c5b84dea7e1..03d09271575 100644
--- a/boards/risc-v/esp32c3/common/src/Make.defs
+++ b/boards/risc-v/esp32c3/common/src/Make.defs
@@ -70,6 +70,10 @@ ifeq ($(CONFIG_SENSORS_BMP180),y)
CSRCS += esp_board_bmp180.c
endif
+ifeq ($(CONFIG_SENSORS_BMP280),y)
+ CSRCS += esp_board_bmp280.c
+endif
+
ifeq ($(CONFIG_MMCSD_SPI),y)
CSRCS += esp_board_mmcsd.c
endif
diff --git a/boards/risc-v/esp32c3/common/src/esp_board_bmp280.c
b/boards/risc-v/esp32c3/common/src/esp_board_bmp280.c
new file mode 100644
index 00000000000..6aa1a9f77fd
--- /dev/null
+++ b/boards/risc-v/esp32c3/common/src/esp_board_bmp280.c
@@ -0,0 +1,94 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/common/src/esp_board_bmp280.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/sensors/bmp280.h>
+#include <nuttx/i2c/i2c_master.h>
+
+#ifndef CONFIG_ESPRESSIF_I2C_BITBANG
+#include "espressif/esp_i2c.h"
+#else
+#include "espressif/esp_i2c_bitbang.h"
+#endif
+
+#include "esp_board_bmp280.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_bmp280_initialize
+ *
+ * Description:
+ * Initialize and register the BMP280 Pressure Sensor driver.
+ *
+ * Input Parameters:
+ * devno - The device number, used to build the device path as /dev/pressN
+ *
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_bmp280_initialize(int devno)
+{
+ struct i2c_master_s *i2c;
+ int ret;
+
+ sninfo("Initializing BMP280!\n");
+
+ /* Initialize I2C */
+
+#ifndef CONFIG_ESPRESSIF_I2C_BITBANG
+ i2c = esp_i2cbus_initialize(ESPRESSIF_I2C0);
+#else
+ i2c = esp_i2cbus_bitbang_initialize();
+#endif
+
+ if (i2c)
+ {
+ /* Then try to register the barometer sensor in I2C0 */
+
+ ret = bmp280_register(devno, i2c);
+ if (ret < 0)
+ {
+ snerr("ERROR: Error registering BMP280 in I2C0\n");
+ }
+ }
+ else
+ {
+ ret = -ENODEV;
+ }
+
+ return ret;
+}
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/Kconfig
b/boards/risc-v/esp32c3/esp32-c3-zero/Kconfig
new file mode 100644
index 00000000000..70d6283b7ce
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/Kconfig
@@ -0,0 +1,8 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+if ARCH_BOARD_ESP32_C3_ZERO
+
+endif # ARCH_BOARD_ESP32_C3_ZERO
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/configs/jumbo/defconfig
b/boards/risc-v/esp32c3/esp32-c3-zero/configs/jumbo/defconfig
new file mode 100644
index 00000000000..03bd912777d
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/configs/jumbo/defconfig
@@ -0,0 +1,61 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed
.config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that
includes your
+# modifications.
+#
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ARCH="risc-v"
+CONFIG_ARCH_BOARD="esp32-c3-zero"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32_C3_ZERO=y
+CONFIG_ARCH_CHIP="esp32c3"
+CONFIG_ARCH_CHIP_ESP32C3=y
+CONFIG_ARCH_INTERRUPTSTACK=1536
+CONFIG_ARCH_RISCV=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_RESET=y
+CONFIG_BOARD_LOOPSPERMSEC=15000
+CONFIG_BUILTIN=y
+CONFIG_ESPRESSIF_GPIO_IRQ=y
+CONFIG_ESPRESSIF_I2C_BITBANG=y
+CONFIG_ESPRESSIF_I2C_BITBANG_SCLPIN=9
+CONFIG_ESPRESSIF_I2C_BITBANG_SDAPIN=8
+CONFIG_ESPRESSIF_SPI_BITBANG=y
+CONFIG_ESPRESSIF_SPI_BITBANG_CLKPIN=4
+CONFIG_ESPRESSIF_SPI_BITBANG_CSPIN=7
+CONFIG_ESPRESSIF_SPI_BITBANG_MISOPIN=5
+CONFIG_ESPRESSIF_SPI_BITBANG_MOSIPIN=6
+CONFIG_EXAMPLES_BMP280=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_FLOATINGPOINT=y
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_STRERROR=y
+CONFIG_PREALLOC_TIMERS=0
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SENSORS=y
+CONFIG_SENSORS_BMP280=y
+CONFIG_START_DAY=29
+CONFIG_START_MONTH=11
+CONFIG_START_YEAR=2019
+CONFIG_SYSTEM_DUMPSTACK=y
+CONFIG_SYSTEM_I2CTOOL=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_SENSORTEST=y
+CONFIG_SYSTEM_SPITOOL=y
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_UART0_SERIAL_CONSOLE=y
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/configs/nsh/defconfig
b/boards/risc-v/esp32c3/esp32-c3-zero/configs/nsh/defconfig
new file mode 100644
index 00000000000..2f4aead1ae1
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/configs/nsh/defconfig
@@ -0,0 +1,45 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed
.config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that
includes your
+# modifications.
+#
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ARCH="risc-v"
+CONFIG_ARCH_BOARD="esp32-c3-zero"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32_C3_ZERO=y
+CONFIG_ARCH_CHIP="esp32c3"
+CONFIG_ARCH_CHIP_ESP32C3=y
+CONFIG_ARCH_INTERRUPTSTACK=1536
+CONFIG_ARCH_RISCV=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_RESET=y
+CONFIG_BOARD_LOOPSPERMSEC=15000
+CONFIG_BUILTIN=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_STRERROR=y
+CONFIG_PREALLOC_TIMERS=0
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=29
+CONFIG_START_MONTH=11
+CONFIG_START_YEAR=2019
+CONFIG_SYSTEM_DUMPSTACK=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_UART0_SERIAL_CONSOLE=y
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/configs/sta_softap/defconfig
b/boards/risc-v/esp32c3/esp32-c3-zero/configs/sta_softap/defconfig
new file mode 100644
index 00000000000..2df8690ad99
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/configs/sta_softap/defconfig
@@ -0,0 +1,83 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed
.config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that
includes your
+# modifications.
+#
+# CONFIG_NDEBUG is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ALLOW_BSD_COMPONENTS=y
+CONFIG_ARCH="risc-v"
+CONFIG_ARCH_BOARD="esp32-c3-zero"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32_C3_ZERO=y
+CONFIG_ARCH_CHIP="esp32c3"
+CONFIG_ARCH_CHIP_ESP32C3=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_RISCV=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_RESET=y
+CONFIG_BOARD_LOOPSPERMSEC=15000
+CONFIG_BUILTIN=y
+CONFIG_DRIVERS_IEEE80211=y
+CONFIG_DRIVERS_WIRELESS=y
+CONFIG_ESPRESSIF_SPIFLASH=y
+CONFIG_ESPRESSIF_SPIFLASH_SPIFFS=y
+CONFIG_ESPRESSIF_WIFI=y
+CONFIG_ESPRESSIF_WIFI_STATION_SOFTAP=y
+CONFIG_EXAMPLES_DHCPD=y
+CONFIG_EXAMPLES_RANDOM=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=8192
+CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=128
+CONFIG_IOB_NBUFFERS=160
+CONFIG_IOB_THROTTLE=24
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_NETDB_DNSCLIENT=y
+CONFIG_NETDEV_LATEINIT=y
+CONFIG_NETDEV_PHY_IOCTL=y
+CONFIG_NETDEV_WIRELESS_IOCTL=y
+CONFIG_NETUTILS_CJSON=y
+CONFIG_NETUTILS_DHCPD=y
+CONFIG_NETUTILS_IPERF=y
+CONFIG_NET_BROADCAST=y
+CONFIG_NET_ETH_PKTSIZE=1514
+CONFIG_NET_ICMP_SOCKET=y
+CONFIG_NET_TCP=y
+CONFIG_NET_TCP_DELAYED_ACK=y
+CONFIG_NET_TCP_WRITE_BUFFERS=y
+CONFIG_NET_UDP=y
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_STRERROR=y
+CONFIG_PREALLOC_TIMERS=0
+CONFIG_PTHREAD_MUTEX_TYPES=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_LPWORK=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SIG_DEFAULT=y
+CONFIG_START_DAY=29
+CONFIG_START_MONTH=11
+CONFIG_START_YEAR=2019
+CONFIG_SYSTEM_DHCPC_RENEW=y
+CONFIG_SYSTEM_DUMPSTACK=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_PING=y
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_TLS_TASK_NELEM=4
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_WIRELESS=y
+CONFIG_WIRELESS_WAPI=y
+CONFIG_WIRELESS_WAPI_CMDTOOL=y
+CONFIG_WIRELESS_WAPI_INITCONF=y
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/configs/usbnsh/defconfig
b/boards/risc-v/esp32c3/esp32-c3-zero/configs/usbnsh/defconfig
new file mode 100644
index 00000000000..87358fe3d2c
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/configs/usbnsh/defconfig
@@ -0,0 +1,45 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed
.config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that
includes your
+# modifications.
+#
+# CONFIG_ESPRESSIF_UART0 is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ARCH="risc-v"
+CONFIG_ARCH_BOARD="esp32-c3-zero"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32_C3_ZERO=y
+CONFIG_ARCH_CHIP="esp32c3"
+CONFIG_ARCH_CHIP_ESP32C3=y
+CONFIG_ARCH_INTERRUPTSTACK=1536
+CONFIG_ARCH_RISCV=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_RESET=y
+CONFIG_BOARD_LOOPSPERMSEC=15000
+CONFIG_BUILTIN=y
+CONFIG_ESPRESSIF_USBSERIAL=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_STRERROR=y
+CONFIG_PREALLOC_TIMERS=0
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=29
+CONFIG_START_MONTH=11
+CONFIG_START_YEAR=2019
+CONFIG_SYSTEM_DUMPSTACK=y
+CONFIG_SYSTEM_NSH=y
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/configs/wifi/defconfig
b/boards/risc-v/esp32c3/esp32-c3-zero/configs/wifi/defconfig
new file mode 100644
index 00000000000..0180fb99d06
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/configs/wifi/defconfig
@@ -0,0 +1,79 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed
.config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that
includes your
+# modifications.
+#
+# CONFIG_NDEBUG is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ALLOW_BSD_COMPONENTS=y
+CONFIG_ARCH="risc-v"
+CONFIG_ARCH_BOARD="esp32-c3-zero"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32_C3_ZERO=y
+CONFIG_ARCH_CHIP="esp32c3"
+CONFIG_ARCH_CHIP_ESP32C3=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_RISCV=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=15000
+CONFIG_BUILTIN=y
+CONFIG_DRIVERS_IEEE80211=y
+CONFIG_DRIVERS_WIRELESS=y
+CONFIG_ESPRESSIF_SPIFLASH=y
+CONFIG_ESPRESSIF_SPIFLASH_SPIFFS=y
+CONFIG_ESPRESSIF_WIFI=y
+CONFIG_EXAMPLES_RANDOM=y
+CONFIG_FS_PROCFS=y
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=8192
+CONFIG_INTELHEX_BINARY=y
+CONFIG_IOB_BUFSIZE=128
+CONFIG_IOB_NBUFFERS=160
+CONFIG_IOB_THROTTLE=24
+CONFIG_LIBC_PERROR_STDOUT=y
+CONFIG_LIBC_STRERROR=y
+CONFIG_NETDB_DNSCLIENT=y
+CONFIG_NETDEV_LATEINIT=y
+CONFIG_NETDEV_PHY_IOCTL=y
+CONFIG_NETDEV_WIRELESS_IOCTL=y
+CONFIG_NETUTILS_CJSON=y
+CONFIG_NETUTILS_IPERF=y
+CONFIG_NET_BROADCAST=y
+CONFIG_NET_ETH_PKTSIZE=1514
+CONFIG_NET_ICMP_SOCKET=y
+CONFIG_NET_TCP=y
+CONFIG_NET_TCP_DELAYED_ACK=y
+CONFIG_NET_TCP_WRITE_BUFFERS=y
+CONFIG_NET_UDP=y
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_STRERROR=y
+CONFIG_PREALLOC_TIMERS=0
+CONFIG_PTHREAD_MUTEX_TYPES=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_BACKTRACE=y
+CONFIG_SCHED_LPWORK=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SIG_DEFAULT=y
+CONFIG_START_DAY=29
+CONFIG_START_MONTH=11
+CONFIG_START_YEAR=2019
+CONFIG_SYSTEM_DHCPC_RENEW=y
+CONFIG_SYSTEM_DUMPSTACK=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_PING=y
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_TLS_TASK_NELEM=4
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_WIRELESS=y
+CONFIG_WIRELESS_WAPI=y
+CONFIG_WIRELESS_WAPI_CMDTOOL=y
+CONFIG_WIRELESS_WAPI_INITCONF=y
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/include/board.h
b/boards/risc-v/esp32c3/esp32-c3-zero/include/board.h
new file mode 100644
index 00000000000..365c142a6db
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/include/board.h
@@ -0,0 +1,41 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/include/board.h
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_RISCV_ESP32C3_ESP32_C3_ZERO_INCLUDE_BOARD_H
+#define __BOARDS_RISCV_ESP32C3_ESP32_C3_ZERO_INCLUDE_BOARD_H
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* GPIO pins used by the GPIO Subsystem */
+
+#define BOARD_NGPIOOUT 2 /* Amount of GPIO Output pins */
+#define BOARD_NGPIOINT 1 /* Amount of GPIO Input w/ Interruption pins */
+
+/* esp32-c3-zero GPIOs */
+
+/* BOOT Button */
+
+#define BUTTON_BOOT 9
+
+#endif /* __BOARDS_RISCV_ESP32C3_ESP32_C3_ZERO_INCLUDE_BOARD_H */
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/scripts/Make.defs
b/boards/risc-v/esp32c3/esp32-c3-zero/scripts/Make.defs
new file mode 100644
index 00000000000..d03f1ce9362
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/scripts/Make.defs
@@ -0,0 +1,61 @@
+############################################################################
+# boards/risc-v/esp32c3/esp32-c3-zero/scripts/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+###########################################################################
+
+include $(TOPDIR)/.config
+include $(TOPDIR)/tools/Config.mk
+include $(TOPDIR)/tools/espressif/Config.mk
+include $(TOPDIR)/arch/risc-v/src/common/Toolchain.defs
+
+# Remove quotes from CONFIG_ESPRESSIF_CHIP_SERIES configuration
+
+CHIP_SERIES = $(patsubst "%",%,$(CONFIG_ESPRESSIF_CHIP_SERIES))
+
+# Pick the linker scripts from the board level if they exist, if not
+# pick the common linker scripts.
+
+ARCHSCRIPT += $(BOARD_COMMON_DIR)/scripts/$(CHIP_SERIES)_aliases.ld
+ARCHSCRIPT += $(call FINDSCRIPT,$(CHIP_SERIES)_flat_memory.ld)
+
+ifeq ($(CONFIG_ESPRESSIF_BOOTLOADER_MCUBOOT),y)
+ ARCHSCRIPT += $(call FINDSCRIPT,$(CHIP_SERIES)_sections.ld)
+else ifeq ($(CONFIG_ESPRESSIF_SIMPLE_BOOT),y)
+ ARCHSCRIPT += $(call FINDSCRIPT,$(CHIP_SERIES)_sections.ld)
+else
+ ARCHSCRIPT += $(call FINDSCRIPT,$(CHIP_SERIES)_legacy_sections.ld)
+endif
+
+ARCHPICFLAGS = -fpic
+
+CFLAGS := $(ARCHCFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES)
$(ARCHDEFINES) $(EXTRAFLAGS) -Werror=return-type
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS)
$(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
+AFLAGS := $(CFLAGS) -D__ASSEMBLY__
+
+# Loadable module definitions
+
+LDMODULEFLAGS += -melf32lriscv
+
+# ELF module definitions
+
+LDELFFLAGS += -melf32lriscv
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/Make.defs
b/boards/risc-v/esp32c3/esp32-c3-zero/src/Make.defs
new file mode 100644
index 00000000000..de99c8deadb
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/Make.defs
@@ -0,0 +1,45 @@
+#############################################################################
+# boards/risc-v/esp32c3/esp32-c3-zero/src/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+#############################################################################
+
+include $(TOPDIR)/Make.defs
+
+CSRCS = esp32c3_boot.c esp32c3_bringup.c
+
+ifeq ($(CONFIG_BOARDCTL),y)
+ CSRCS += esp32c3_appinit.c
+
+ ifeq ($(CONFIG_BOARDCTL_RESET),y)
+ CSRCS += esp32c3_reset.c
+ endif
+endif
+
+ifeq ($(CONFIG_DEV_GPIO),y)
+ CSRCS += esp32c3_gpio.c
+endif
+
+ifeq ($(CONFIG_ARCH_BUTTONS),y)
+ CSRCS += esp32c3_buttons.c
+endif
+
+DEPPATH += --dep-path board
+VPATH += :board
+CFLAGS +=
${INCDIR_PREFIX}$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)board
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32-c3-zero.h
b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32-c3-zero.h
new file mode 100644
index 00000000000..506b3d094a1
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32-c3-zero.h
@@ -0,0 +1,121 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/src/esp32-c3-zero.h
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __BOARDS_RISCV_ESP32C3_ESP32_C3_ZERO_SRC_ESP32_C3_ZERO_H
+#define __BOARDS_RISCV_ESP32C3_ESP32_C3_ZERO_SRC_ESP32_C3_ZERO_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* RMT gpio */
+
+#define RMT_RXCHANNEL 2
+#define RMT_TXCHANNEL 0
+
+#ifdef CONFIG_RMT_LOOP_TEST_MODE
+# define RMT_INPUT_PIN 0
+# define RMT_OUTPUT_PIN 0
+#else
+# define RMT_INPUT_PIN 2
+# define RMT_OUTPUT_PIN 10
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp_bringup
+ *
+ * Description:
+ * Perform architecture-specific initialization.
+ *
+ * CONFIG_BOARD_LATE_INITIALIZE=y :
+ * Called from board_late_initialize().
+ *
+ * CONFIG_BOARD_LATE_INITIALIZE=y && CONFIG_BOARDCTL=y :
+ * Called from the NSH library via board_app_initialize().
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; A negated errno value is returned on
+ * any failure.
+ *
+ ****************************************************************************/
+
+int esp_bringup(void);
+
+/****************************************************************************
+ * Name: board_twai_setup
+ *
+ * Description:
+ * Initialize TWAI and register the TWAI device
+ *
+ * Input Parameters:
+ * None
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; A negated errno value is returned on
+ * any failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_ESPRESSIF_TWAI
+int board_twai_setup(void);
+#endif
+
+/****************************************************************************
+ * Name: esp_gpio_init
+ *
+ * Description:
+ * Configure the GPIO driver.
+ *
+ * Returned Value:
+ * Zero (OK).
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_DEV_GPIO
+int esp_gpio_init(void);
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __BOARDS_RISCV_ESP32C3_ESP32_C3_ZERO_SRC_ESP32_C3_ZERO_H */
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_appinit.c
b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_appinit.c
new file mode 100644
index 00000000000..ab3478a7f60
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_appinit.c
@@ -0,0 +1,83 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_appinit.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+
+#include <nuttx/board.h>
+
+#include "esp32-c3-zero.h"
+
+#ifdef CONFIG_BOARDCTL
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_app_initialize
+ *
+ * Description:
+ * Perform application specific initialization. This function is never
+ * called directly from application code, but only indirectly via the
+ * (non-standard) boardctl() interface using the command BOARDIOC_INIT.
+ *
+ * Input Parameters:
+ * arg - The boardctl() argument is passed to the board_app_initialize()
+ * implementation without modification. The argument has no
+ * meaning to NuttX; the meaning of the argument is a contract
+ * between the board-specific initialization logic and the
+ * matching application logic. The value could be such things as a
+ * mode enumeration value, a set of DIP switch settings, a
+ * pointer to configuration data read from a file or serial FLASH,
+ * or whatever you would like to do with it. Every implementation
+ * should accept zero/NULL as a default configuration.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; a negated errno value is returned on
+ * any failure to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int board_app_initialize(uintptr_t arg)
+{
+#ifdef CONFIG_BOARD_LATE_INITIALIZE
+ /* Board initialization already performed by board_late_initialize() */
+
+ return OK;
+#else
+ /* Perform board-specific initialization */
+
+ return esp_bringup();
+#endif
+}
+
+#endif /* CONFIG_BOARDCTL */
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_boot.c
b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_boot.c
new file mode 100644
index 00000000000..5e77d94eea2
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_boot.c
@@ -0,0 +1,89 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_boot.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp_board_initialize
+ *
+ * Description:
+ * All Espressif boards must provide the following entry point.
+ * This entry point is called early in the initialization -- after all
+ * memory has been configured and mapped but before any devices have been
+ * initialized.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * None.
+ *
+ ****************************************************************************/
+
+void esp_board_initialize(void)
+{
+}
+
+/****************************************************************************
+ * Name: board_late_initialize
+ *
+ * Description:
+ * If CONFIG_BOARD_LATE_INITIALIZE is selected, then an additional
+ * initialization call will be performed in the boot-up sequence to a
+ * function called board_late_initialize(). board_late_initialize() will
+ * be called immediately after up_initialize() is called and just before
+ * the initial application is started. This additional initialization
+ * phase may be used, for example, to initialize board-specific device
+ * drivers.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * None.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_BOARD_LATE_INITIALIZE
+void board_late_initialize(void)
+{
+ /* Perform board-specific initialization */
+
+ esp_bringup();
+}
+#endif
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_bringup.c
b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_bringup.c
new file mode 100644
index 00000000000..c2bc6bf853f
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_bringup.c
@@ -0,0 +1,492 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_bringup.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+#include <fcntl.h>
+#include <syslog.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <nuttx/fs/fs.h>
+
+#include "esp_board_ledc.h"
+
+#ifdef CONFIG_ESPRESSIF_ADC
+# include "esp_board_adc.h"
+#endif
+
+#ifdef CONFIG_WATCHDOG
+# include "espressif/esp_wdt.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_SPIFLASH
+# include "esp_board_spiflash.h"
+#endif
+
+#ifdef CONFIG_TIMER
+# include "espressif/esp_timer.h"
+#endif
+
+#ifdef CONFIG_ONESHOT
+# include "espressif/esp_oneshot.h"
+#endif
+
+#ifdef CONFIG_RTC_DRIVER
+# include "espressif/esp_rtc.h"
+#endif
+
+#ifdef CONFIG_DEV_GPIO
+# include "espressif/esp_gpio.h"
+#endif
+
+#ifdef CONFIG_INPUT_BUTTONS
+# include <nuttx/input/buttons.h>
+#endif
+
+#ifdef CONFIG_ESPRESSIF_EFUSE
+# include "espressif/esp_efuse.h"
+#endif
+
+#ifdef CONFIG_ESP_RMT
+# include "esp_board_rmt.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_I2C
+# include "esp_board_i2c.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_I2S
+# include "esp_board_i2s.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_SPI
+# include "espressif/esp_spi.h"
+# include "esp_board_spidev.h"
+# ifdef CONFIG_ESPRESSIF_SPI_BITBANG
+# include "espressif/esp_spi_bitbang.h"
+# endif
+#endif
+
+#ifdef CONFIG_ESPRESSIF_TEMP
+# include "espressif/esp_temperature_sensor.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_WIFI_BT_COEXIST
+# include "private/esp_coexist_internal.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_WIFI
+# include "esp_board_wlan.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_BLE
+# include "esp_ble.h"
+#endif
+
+#ifdef CONFIG_SPI_SLAVE
+# include "espressif/esp_spi.h"
+# include "esp_board_spislavedev.h"
+#endif
+
+#ifdef CONFIG_SYSTEM_NXDIAG_ESPRESSIF_CHIP_WO_TOOL
+# include "espressif/esp_nxdiag.h"
+#endif
+
+#ifdef CONFIG_ESP_SDM
+# include "espressif/esp_sdm.h"
+#endif
+
+#ifdef CONFIG_ESPRESSIF_SHA_ACCELERATOR
+# include "espressif/esp_sha.h"
+#endif
+
+#ifdef CONFIG_MMCSD_SPI
+# include "esp_board_mmcsd.h"
+#endif
+
+#ifdef CONFIG_SENSORS_BMP180
+# include "esp_board_bmp180.h"
+#endif
+
+#ifdef CONFIG_SENSORS_BMP280
+# include "esp_board_bmp280.h"
+#endif
+
+#include "esp32-c3-zero.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp_bringup
+ *
+ * Description:
+ * Perform architecture-specific initialization.
+ *
+ * CONFIG_BOARD_LATE_INITIALIZE=y :
+ * Called from board_late_initialize().
+ *
+ * CONFIG_BOARD_LATE_INITIALIZE=y && CONFIG_BOARDCTL=y :
+ * Called from the NSH library via board_app_initialize().
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; A negated errno value is returned on
+ * any failure.
+ *
+ ****************************************************************************/
+
+int esp_bringup(void)
+{
+ int ret = OK;
+
+#ifdef CONFIG_FS_PROCFS
+ /* Mount the procfs file system */
+
+ ret = nx_mount(NULL, "/proc", "procfs", 0, NULL);
+ if (ret < 0)
+ {
+ _err("Failed to mount procfs at /proc: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_FS_TMPFS
+ /* Mount the tmpfs file system */
+
+ ret = nx_mount(NULL, CONFIG_LIBC_TMPDIR, "tmpfs", 0, NULL);
+ if (ret < 0)
+ {
+ _err("Failed to mount tmpfs at %s: %d\n", CONFIG_LIBC_TMPDIR, ret);
+ }
+#endif
+
+#if defined(CONFIG_ESPRESSIF_EFUSE)
+ ret = esp_efuse_initialize("/dev/efuse");
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: Failed to init EFUSE: %d\n", ret);
+ }
+#endif
+
+#if defined(CONFIG_ESPRESSIF_SHA_ACCELERATOR) && \
+ !defined(CONFIG_CRYPTO_CRYPTODEV_HARDWARE)
+ ret = esp_sha_init();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR,
+ "ERROR: Failed to initialize SHA: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_MWDT0
+ ret = esp_wdt_initialize("/dev/watchdog0", ESP_WDT_MWDT0);
+ if (ret < 0)
+ {
+ _err("Failed to initialize WDT: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_MWDT1
+ ret = esp_wdt_initialize("/dev/watchdog1", ESP_WDT_MWDT1);
+ if (ret < 0)
+ {
+ _err("Failed to initialize WDT: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_RWDT
+ ret = esp_wdt_initialize("/dev/watchdog2", ESP_WDT_RWDT);
+ if (ret < 0)
+ {
+ _err("Failed to initialize WDT: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_XTWDT
+ ret = esp_wdt_initialize("/dev/watchdog3", ESP_WDT_XTAL32K);
+ if (ret < 0)
+ {
+ _err("Failed to initialize WDT: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_TIMER
+ ret = esp_timer_initialize(0);
+ if (ret < 0)
+ {
+ _err("Failed to initialize Timer 0: %d\n", ret);
+ }
+
+#ifndef CONFIG_ONESHOT
+ ret = esp_timer_initialize(1);
+ if (ret < 0)
+ {
+ _err("Failed to initialize Timer 1: %d\n", ret);
+ }
+#endif
+#endif
+
+#ifdef CONFIG_ESPRESSIF_SPI
+# ifdef CONFIG_ESPRESSIF_SPI2
+ ret = board_spidev_initialize(ESPRESSIF_SPI2);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: Failed to init spidev 2: %d\n", ret);
+ }
+# endif /* CONFIG_ESPRESSIF_SPI2 */
+
+# ifdef CONFIG_ESPRESSIF_SPI_BITBANG
+ ret = board_spidev_initialize(ESPRESSIF_SPI_BITBANG);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: Failed to init spidev 3: %d\n", ret);
+ }
+# endif /* CONFIG_ESPRESSIF_SPI_BITBANG */
+#endif /* CONFIG_ESPRESSIF_SPI */
+
+#if defined(CONFIG_ESPRESSIF_SPI) && defined(CONFIG_MMCSD_SPI)
+ ret = esp_mmcsd_spi_initialize();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: failed to init MMCSD SPI\n");
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_SPIFLASH
+ ret = board_spiflash_init();
+ if (ret)
+ {
+ syslog(LOG_ERR, "ERROR: Failed to initialize SPI Flash\n");
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_TEMP
+ struct esp_temp_sensor_config_t cfg = TEMPERATURE_SENSOR_CONFIG(10, 50);
+ ret = esp_temperature_sensor_initialize(cfg);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize temperature sensor driver: %d\n",
+ ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_WIFI_BT_COEXIST
+ esp_coex_adapter_register(&g_coex_adapter_funcs);
+ coex_pre_init();
+#endif
+
+#ifdef CONFIG_ESPRESSIF_WIFI
+ ret = board_wlan_init();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: Failed to initialize wireless subsystem=%d\n",
+ ret);
+ }
+#endif
+
+#ifdef CONFIG_RTC_DRIVER
+ /* Initialize the RTC driver */
+
+ ret = esp_rtc_driverinit();
+ if (ret < 0)
+ {
+ _err("Failed to initialize the RTC driver: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_BLE
+ ret = esp_ble_initialize();
+ if (ret)
+ {
+ syslog(LOG_ERR, "ERROR: Failed to initialize BLE\n");
+ return ret;
+ }
+#endif
+
+#if defined(CONFIG_SPI_SLAVE) && defined(CONFIG_ESPRESSIF_SPI2)
+ ret = board_spislavedev_initialize(ESPRESSIF_SPI2);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize SPI%d Slave driver: %d\n",
+ ESPRESSIF_SPI2, ret);
+ }
+#endif
+
+#ifdef CONFIG_ONESHOT
+ ret = esp_oneshot_initialize();
+ if (ret < 0)
+ {
+ _err("Failed to initialize Oneshot Timer: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESP_RMT
+ ret = board_rmt_txinitialize(RMT_TXCHANNEL, RMT_OUTPUT_PIN);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: board_rmt_txinitialize() failed: %d\n", ret);
+ }
+
+ ret = board_rmt_rxinitialize(RMT_RXCHANNEL, RMT_INPUT_PIN);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: board_rmt_txinitialize() failed: %d\n", ret);
+ }
+#endif
+
+#if defined(CONFIG_ESPRESSIF_I2S)
+ /* Configure I2S peripheral interfaces */
+
+ ret = board_i2s_init();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize I2S driver: %d\n", ret);
+ }
+#endif
+
+#if defined(CONFIG_ESPRESSIF_I2C)
+ /* Configure I2C peripheral interfaces */
+
+ ret = board_i2c_init();
+
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize I2C driver: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_SENSORS_BMP180
+ /* Try to register BMP180 device in I2C0 */
+
+ ret = board_bmp180_initialize(0);
+
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize BMP180 "
+ "Driver for I2C0: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_SENSORS_BMP280
+ /* Try to register BMP280 device in I2C0 */
+
+ ret = board_bmp280_initialize(0);
+
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize BMP280 "
+ "Driver for I2C0: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESP_SDM
+ struct esp_sdm_chan_config_s config =
+ {
+ .gpio_num = 5,
+ .sample_rate_hz = 1000 * 1000,
+ .flags = 0,
+ };
+
+ struct dac_dev_s *dev = esp_sdminitialize(config);
+ ret = dac_register("/dev/dac0", dev);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize DAC driver: %d\n",
+ ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_TWAI
+
+ /* Initialize TWAI and register the TWAI driver. */
+
+ ret = board_twai_setup();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: board_twai_setup failed: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_DEV_GPIO
+ ret = esp_gpio_init();
+ if (ret < 0)
+ {
+ ierr("Failed to initialize GPIO Driver: %d\n", ret);
+ }
+#endif
+
+#if defined(CONFIG_INPUT_BUTTONS) && defined(CONFIG_INPUT_BUTTONS_LOWER)
+ /* Register the BUTTON driver */
+
+ ret = btn_lower_initialize("/dev/buttons");
+ if (ret < 0)
+ {
+ ierr("ERROR: btn_lower_initialize() failed: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_LEDC
+ ret = board_ledc_setup();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: board_ledc_setup() failed: %d\n", ret);
+ }
+#endif /* CONFIG_ESPRESSIF_LEDC */
+
+#ifdef CONFIG_SYSTEM_NXDIAG_ESPRESSIF_CHIP_WO_TOOL
+ ret = esp_nxdiag_initialize();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: esp_nxdiag_initialize failed: %d\n", ret);
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_ADC
+ ret = board_adc_init();
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize ADC driver: %d\n", ret);
+ }
+#endif
+
+ /* If we got here then perhaps not all initialization was successful, but
+ * at least enough succeeded to bring-up NSH with perhaps reduced
+ * capabilities.
+ */
+
+ return ret;
+}
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_buttons.c
b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_buttons.c
new file mode 100644
index 00000000000..5177ff4d2a3
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_buttons.c
@@ -0,0 +1,200 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_buttons.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/* Config */
+
+#include <nuttx/config.h>
+
+/* Libc */
+
+#include <assert.h>
+#include <debug.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+/* NuttX */
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+#include <nuttx/irq.h>
+#include <arch/irq.h>
+
+/* Arch */
+
+#include "espressif/esp_gpio.h"
+
+/* Board */
+
+#include "esp32-c3-zero.h"
+#include <arch/board/board.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_button_initialize
+ *
+ * Description:
+ * board_button_initialize() must be called to initialize button resources.
+ * After that, board_buttons() may be called to collect the current state
+ * of all buttons or board_button_irq() may be called to register button
+ * interrupt handlers.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * The number of buttons that were initialized.
+ *
+ ****************************************************************************/
+
+uint32_t board_button_initialize(void)
+{
+ esp_configgpio(BUTTON_BOOT, INPUT_FUNCTION_2 | PULLUP);
+ return 1;
+}
+
+/****************************************************************************
+ * Name: board_buttons
+ *
+ * Description:
+ * After board_button_initialize() has been called, board_buttons() may be
+ * called to collect the state of all buttons.
+ *
+ * Input Parameters:
+ * None.
+ *
+ * Returned Value:
+ * An 8-bit bit set with each bit associated with a button. See the
+ * BUTTON_*_BIT definitions in board.h for the meaning of each bit.
+ *
+ ****************************************************************************/
+
+uint32_t board_buttons(void)
+{
+ uint8_t ret = 0;
+ int i = 0;
+ int n = 0;
+
+ bool b0 = esp_gpioread(BUTTON_BOOT);
+
+ for (i = 0; i < 10; i++)
+ {
+ up_mdelay(1); /* TODO */
+
+ bool b1 = esp_gpioread(BUTTON_BOOT);
+
+ if (b0 == b1)
+ {
+ n++;
+ }
+ else
+ {
+ n = 0;
+ }
+
+ if (3 == n)
+ {
+ break;
+ }
+
+ b0 = b1;
+ }
+
+ iinfo("b=%d n=%d\n", b0, n);
+
+ /* Low value means that the button is pressed */
+
+ if (!b0)
+ {
+ ret = 0x1;
+ }
+
+ return ret;
+}
+
+/****************************************************************************
+ * Name: board_button_irq
+ *
+ * Description:
+ * board_button_irq() may be called to register an interrupt handler that
+ * will be called when a button is depressed or released. The ID value is
+ * a button enumeration value that uniquely identifies a button resource.
+ * See the BUTTON_* definitions in board.h for the meaning of enumeration
+ * value.
+ *
+ * Input Parameters:
+ * id - Identifies the button to be monitored. It is equivalent to
+ * the bit used to report the button state in the return value
+ * from board_buttons().
+ * irqhandler - The handler that will be invoked when the interrupt occurs.
+ * arg - Pointer to the arguments that will be provided to the
+ * interrupt handler.
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_ARCH_IRQBUTTONS
+int board_button_irq(int id, xcpt_t irqhandler, void *arg)
+{
+ int ret;
+ DEBUGASSERT(id == 0);
+
+ int irq = ESP_PIN2IRQ(BUTTON_BOOT);
+
+ if (NULL != irqhandler)
+ {
+ /* Make sure the interrupt is disabled */
+
+ esp_gpioirqdisable(irq);
+
+ gpioinfo("Attach %p\n", irqhandler);
+
+ ret = irq_attach(irq, irqhandler, arg);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: irq_attach() failed: %d\n", ret);
+ return ret;
+ }
+
+ /* Configure the interrupt for rising and falling edges */
+
+ gpioinfo("Enabling the interrupt\n");
+ esp_gpioirqenable(irq, CHANGE);
+ }
+ else
+ {
+ gpioinfo("Disable the interrupt\n");
+ esp_gpioirqdisable(irq);
+ }
+
+ return OK;
+}
+#endif
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_gpio.c
b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_gpio.c
new file mode 100644
index 00000000000..a07be9746d0
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_gpio.c
@@ -0,0 +1,558 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_gpio.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/* Config */
+
+#include <nuttx/config.h>
+
+/* Libc */
+
+#include <sys/types.h>
+#include <syslog.h>
+#include <assert.h>
+#include <debug.h>
+
+/* NuttX */
+
+#include <arch/irq.h>
+#include <nuttx/irq.h>
+#include <nuttx/ioexpander/gpio.h>
+
+/* Arch */
+
+#include "espressif/esp_gpio.h"
+#ifdef CONFIG_ESPRESSIF_DEDICATED_GPIO
+#include "espressif/esp_dedic_gpio.h"
+#endif
+
+/* Board */
+
+#include "esp32-c3-zero.h"
+#include <arch/board/board.h>
+
+/* HAL */
+
+#include <arch/chip/gpio_sig_map.h>
+
+#if defined(CONFIG_DEV_GPIO) && !defined(CONFIG_GPIO_LOWER_HALF)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Pin 1 and 2 are used for this example as GPIO outputs. */
+
+#define GPIO_OUT1 1
+#define GPIO_OUT2 2
+
+#if !defined(CONFIG_ESPRESSIF_GPIO_IRQ) && BOARD_NGPIOINT > 0
+# error "NGPIOINT is > 0 and GPIO interrupts aren't enabled"
+#endif
+
+/* Interrupt pins. GPIO9 is used as an example, any other inputs could be
+ * used.
+ */
+
+#define GPIO_IRQPIN 9
+
+/* Dedicated GPIO pins. GPIO4 and GPIO5 is used as an example, any other
+ * GPIOs could be used.
+ */
+
+#define GPIO_DEDIC1 4
+#define GPIO_DEDIC2 5
+#define GPIO_DEDIC_COUNT 2
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct espgpio_dev_s
+{
+ struct gpio_dev_s gpio;
+ uint8_t id;
+};
+
+struct espgpint_dev_s
+{
+ struct espgpio_dev_s espgpio;
+ pin_interrupt_t callback;
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+#if BOARD_NGPIOOUT > 0
+static int gpout_read(struct gpio_dev_s *dev, bool *value);
+static int gpout_write(struct gpio_dev_s *dev, bool value);
+static int gpout_setpintype(struct gpio_dev_s *dev,
+ enum gpio_pintype_e pintype);
+#endif
+
+#if BOARD_NGPIOINT > 0
+static int gpint_read(struct gpio_dev_s *dev, bool *value);
+static int gpint_attach(struct gpio_dev_s *dev,
+ pin_interrupt_t callback);
+static int gpint_enable(struct gpio_dev_s *dev, bool enable);
+static int gpint_setpintype(struct gpio_dev_s *dev,
+ enum gpio_pintype_e pintype);
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#if BOARD_NGPIOOUT > 0
+static const struct gpio_operations_s gpout_ops =
+{
+ .go_read = gpout_read,
+ .go_write = gpout_write,
+ .go_attach = NULL,
+ .go_enable = NULL,
+ .go_setpintype = gpout_setpintype,
+};
+
+/* This array maps the GPIO pins used as OUTPUT */
+
+static const uint32_t g_gpiooutputs[BOARD_NGPIOOUT] =
+{
+ GPIO_OUT1, GPIO_OUT2
+};
+
+static struct espgpio_dev_s g_gpout[BOARD_NGPIOOUT];
+#endif
+
+#if BOARD_NGPIOINT > 0
+static const struct gpio_operations_s gpint_ops =
+{
+ .go_read = gpint_read,
+ .go_write = NULL,
+ .go_attach = gpint_attach,
+ .go_enable = gpint_enable,
+ .go_setpintype = gpint_setpintype,
+};
+
+/* This array maps the GPIO pins used as INTERRUPT INPUTS */
+
+static const uint32_t g_gpiointinputs[BOARD_NGPIOINT] =
+{
+ GPIO_IRQPIN,
+};
+
+static struct espgpint_dev_s g_gpint[BOARD_NGPIOINT];
+#endif
+
+/* This array maps the GPIO pins used as Dedicated GPIO */
+
+#ifdef CONFIG_ESPRESSIF_DEDICATED_GPIO
+static const int g_gpioidedic[GPIO_DEDIC_COUNT] =
+{
+ GPIO_DEDIC1, GPIO_DEDIC2
+};
+
+static struct esp_dedic_gpio_flags_s dedic_gpio_flags =
+{
+ .input_enable = 1,
+ .invert_input_enable = 0,
+ .output_enable = 1,
+ .invert_output_enable = 0
+};
+
+struct esp_dedic_gpio_config_s dedic_gpio_conf =
+{
+ .gpio_array = g_gpioidedic,
+ .array_size = GPIO_DEDIC_COUNT,
+ .flags = &dedic_gpio_flags,
+ .path = "/dev/dedic_gpio0"
+};
+
+struct file *dedicated_gpio = NULL;
+#endif
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: gpout_read
+ *
+ * Description:
+ * Read a digital output pin.
+ *
+ * Parameters:
+ * dev - A pointer to the gpio driver struct.
+ * value - A pointer to store the state of the pin.
+ *
+ * Returned Value:
+ * Zero (OK).
+ *
+ ****************************************************************************/
+
+#if BOARD_NGPIOOUT > 0
+static int gpout_read(struct gpio_dev_s *dev, bool *value)
+{
+ struct espgpio_dev_s *espgpio = (struct espgpio_dev_s *)dev;
+
+ DEBUGASSERT(espgpio != NULL && value != NULL);
+ DEBUGASSERT(espgpio->id < BOARD_NGPIOOUT);
+ gpioinfo("Reading...\n");
+
+ *value = esp_gpioread(g_gpiooutputs[espgpio->id]);
+ return OK;
+}
+
+/****************************************************************************
+ * Name: gpout_write
+ *
+ * Description:
+ * Write to a digital output pin.
+ *
+ * Parameters:
+ * dev - A pointer to the gpio driver struct.
+ * value - The value to be written.
+ *
+ * Returned Value:
+ * Zero (OK).
+ *
+ ****************************************************************************/
+
+static int gpout_write(struct gpio_dev_s *dev, bool value)
+{
+ struct espgpio_dev_s *espgpio = (struct espgpio_dev_s *)dev;
+
+ DEBUGASSERT(espgpio != NULL);
+ DEBUGASSERT(espgpio->id < BOARD_NGPIOOUT);
+ gpioinfo("Writing %d\n", (int)value);
+
+ esp_gpiowrite(g_gpiooutputs[espgpio->id], value);
+ return OK;
+}
+
+/****************************************************************************
+ * Name: gpout_setpintype
+ *
+ * Description:
+ * Set digital output pin type.
+ *
+ * Parameters:
+ * dev - A pointer to the gpio driver struct.
+ * pintype - The pin type. See nuttx/ioexpander/gpio.h.
+ *
+ * Returned Value:
+ * Zero (OK) on success; -1 (ERROR) otherwise.
+ *
+ ****************************************************************************/
+
+static int gpout_setpintype(struct gpio_dev_s *dev,
+ enum gpio_pintype_e pintype)
+{
+ struct espgpio_dev_s *espgpio = (struct espgpio_dev_s *)dev;
+
+ DEBUGASSERT(espgpio != NULL);
+ DEBUGASSERT(espgpio->id < BOARD_NGPIOOUT);
+ gpioinfo("Setting pintype: %d\n", (int)pintype);
+
+ esp_gpio_matrix_out(g_gpiooutputs[espgpio->id],
+ SIG_GPIO_OUT_IDX, 0, 0);
+
+ switch (pintype)
+ {
+ case GPIO_INPUT_PIN:
+ esp_configgpio(g_gpiooutputs[espgpio->id], INPUT);
+ break;
+ case GPIO_INPUT_PIN_PULLUP:
+ esp_configgpio(g_gpiooutputs[espgpio->id], INPUT_PULLUP);
+ break;
+ case GPIO_INPUT_PIN_PULLDOWN:
+ esp_configgpio(g_gpiooutputs[espgpio->id], INPUT_PULLDOWN);
+ break;
+ case GPIO_OUTPUT_PIN:
+ esp_configgpio(g_gpiooutputs[espgpio->id], INPUT | OUTPUT);
+ break;
+ case GPIO_OUTPUT_PIN_OPENDRAIN:
+ esp_configgpio(g_gpiooutputs[espgpio->id],
+ INPUT | OUTPUT_OPEN_DRAIN);
+ break;
+ default:
+ return ERROR;
+ break;
+ }
+
+ return OK;
+}
+#endif
+
+/****************************************************************************
+ * Name: espgpio_interrupt
+ *
+ * Description:
+ * Digital input interrupt handler.
+ *
+ * Input Parameters:
+ * irq - Identifier of the interrupt request.
+ * context - Context data from the ISR.
+ * arg - Opaque pointer to the internal driver state structure.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; a negated errno value is returned
+ * on failure.
+ *
+ ****************************************************************************/
+
+#if BOARD_NGPIOINT > 0
+static int espgpio_interrupt(int irq, void *context, void *arg)
+{
+ struct espgpint_dev_s *espgpint = (struct espgpint_dev_s *)arg;
+
+ DEBUGASSERT(espgpint != NULL && espgpint->callback != NULL);
+ gpioinfo("Interrupt! callback=%p\n", espgpint->callback);
+
+ espgpint->callback(&espgpint->espgpio.gpio, espgpint->espgpio.id);
+ return OK;
+}
+
+/****************************************************************************
+ * Name: gpint_read
+ *
+ * Description:
+ * Read a digital input pin.
+ *
+ * Parameters:
+ * dev - A pointer to the gpio driver struct.
+ * value - A pointer to store the state of the pin.
+ *
+ * Returned Value:
+ * Zero (OK).
+ *
+ ****************************************************************************/
+
+static int gpint_read(struct gpio_dev_s *dev, bool *value)
+{
+ struct espgpint_dev_s *espgpint =
+ (struct espgpint_dev_s *)dev;
+
+ DEBUGASSERT(espgpint != NULL && value != NULL);
+ DEBUGASSERT(espgpint->espgpio.id < BOARD_NGPIOINT);
+ gpioinfo("Reading int pin...\n");
+
+ *value = esp_gpioread(g_gpiointinputs[espgpint->espgpio.id]);
+ return OK;
+}
+
+/****************************************************************************
+ * Name: gpint_attach
+ *
+ * Description:
+ * Attach the ISR to IRQ and register the callback. But it still doesn't
+ * enable interrupt yet.
+ *
+ * Parameters:
+ * dev - A pointer to the gpio driver struct.
+ * callback - User callback function.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; A negated errno value is returned
+ * to indicate the nature of any failure.
+ *
+ ****************************************************************************/
+
+static int gpint_attach(struct gpio_dev_s *dev,
+ pin_interrupt_t callback)
+{
+ struct espgpint_dev_s *espgpint =
+ (struct espgpint_dev_s *)dev;
+ int irq = ESP_PIN2IRQ(g_gpiointinputs[espgpint->espgpio.id]);
+ int ret;
+
+ gpioinfo("Attaching the callback\n");
+
+ /* Make sure the interrupt is disabled */
+
+ esp_gpioirqdisable(irq);
+ ret = irq_attach(irq,
+ espgpio_interrupt,
+ &g_gpint[espgpint->espgpio.id]);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: gpint_attach() failed: %d\n", ret);
+ return ret;
+ }
+
+ gpioinfo("Attach %p\n", callback);
+ espgpint->callback = callback;
+ return OK;
+}
+
+/****************************************************************************
+ * Name: gpint_enable
+ *
+ * Description:
+ * Enable/Disable interrupt.
+ *
+ * Parameters:
+ * dev - A pointer to the gpio driver struct.
+ * enable - True to enable, false to disable.
+ *
+ * Returned Value:
+ * Zero (OK).
+ *
+ ****************************************************************************/
+
+static int gpint_enable(struct gpio_dev_s *dev, bool enable)
+{
+ struct espgpint_dev_s *espgpint = (struct espgpint_dev_s *)dev;
+ int irq = ESP_PIN2IRQ(g_gpiointinputs[espgpint->espgpio.id]);
+
+ if (enable)
+ {
+ if (espgpint->callback != NULL)
+ {
+ gpioinfo("Enabling the interrupt\n");
+
+ /* Configure the interrupt for rising edge */
+
+ esp_gpioirqenable(irq, RISING);
+ }
+ }
+ else
+ {
+ gpioinfo("Disable the interrupt\n");
+ esp_gpioirqdisable(irq);
+ }
+
+ return OK;
+}
+
+/****************************************************************************
+ * Name: gpint_setpintype
+ *
+ * Description:
+ * Set digital interrupt pin type.
+ *
+ * Parameters:
+ * dev - A pointer to the gpio driver struct.
+ * pintype - The pin type. See nuttx/ioexpander/gpio.h.
+ *
+ * Returned Value:
+ * Zero (OK) on success; -1 (ERROR) otherwise.
+ *
+ ****************************************************************************/
+
+static int gpint_setpintype(struct gpio_dev_s *dev,
+ enum gpio_pintype_e pintype)
+{
+ struct espgpint_dev_s *espgpint = (struct espgpint_dev_s *)dev;
+
+ DEBUGASSERT(espgpint != NULL);
+ DEBUGASSERT(espgpint->espgpio.id < BOARD_NGPIOINT);
+ gpioinfo("Setting pintype: %d\n", (int)pintype);
+ switch (pintype)
+ {
+ case GPIO_INTERRUPT_HIGH_PIN:
+ esp_configgpio(g_gpiointinputs[espgpint->espgpio.id],
+ INPUT_PULLUP);
+ break;
+ case GPIO_INTERRUPT_LOW_PIN:
+ esp_configgpio(g_gpiointinputs[espgpint->espgpio.id],
+ INPUT_PULLDOWN);
+ break;
+ default:
+ return ERROR;
+ break;
+ }
+
+ return OK;
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: esp_gpio_init
+ *
+ * Description:
+ * Configure the GPIO driver.
+ *
+ * Returned Value:
+ * Zero (OK).
+ *
+ ****************************************************************************/
+
+int esp_gpio_init(void)
+{
+ int pincount = 0;
+ int i;
+
+#if BOARD_NGPIOOUT > 0
+ for (i = 0; i < BOARD_NGPIOOUT; i++)
+ {
+ /* Setup and register the GPIO pin */
+
+ g_gpout[i].gpio.gp_pintype = GPIO_OUTPUT_PIN;
+ g_gpout[i].gpio.gp_ops = &gpout_ops;
+ g_gpout[i].id = i;
+ gpio_pin_register(&g_gpout[i].gpio, pincount);
+
+ /* Configure the pins that will be used as output */
+
+ esp_gpio_matrix_out(g_gpiooutputs[i], SIG_GPIO_OUT_IDX, 0, 0);
+ esp_configgpio(g_gpiooutputs[i], OUTPUT_FUNCTION_2 | INPUT_FUNCTION_2);
+ esp_gpiowrite(g_gpiooutputs[i], 0);
+
+ pincount++;
+ }
+#endif
+
+#if BOARD_NGPIOINT > 0
+ for (i = 0; i < BOARD_NGPIOINT; i++)
+ {
+ /* Setup and register the GPIO pin */
+
+ g_gpint[i].espgpio.gpio.gp_pintype = GPIO_INTERRUPT_PIN;
+ g_gpint[i].espgpio.gpio.gp_ops = &gpint_ops;
+ g_gpint[i].espgpio.id = i;
+ gpio_pin_register(&g_gpint[i].espgpio.gpio, pincount);
+
+ /* Configure the pins that will be used as interrupt input */
+
+ esp_configgpio(g_gpiointinputs[i], INPUT_FUNCTION_2 | PULLDOWN);
+
+ pincount++;
+ }
+#endif
+
+#ifdef CONFIG_ESPRESSIF_DEDICATED_GPIO
+ dedicated_gpio = esp_dedic_gpio_new_bundle(&dedic_gpio_conf);
+
+ pincount++;
+#endif
+
+ return OK;
+}
+#endif /* CONFIG_DEV_GPIO && !CONFIG_GPIO_LOWER_HALF */
diff --git a/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_reset.c
b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_reset.c
new file mode 100644
index 00000000000..c68e3fb9c55
--- /dev/null
+++ b/boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_reset.c
@@ -0,0 +1,83 @@
+/****************************************************************************
+ * boards/risc-v/esp32c3/esp32-c3-zero/src/esp32c3_reset.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <assert.h>
+#include <debug.h>
+#include <stdlib.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/board.h>
+
+#include "espressif/esp_systemreset.h"
+
+#ifdef CONFIG_BOARDCTL_RESET
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_reset
+ *
+ * Description:
+ * Reset board. Support for this function is required by board-level
+ * logic if CONFIG_BOARDCTL_RESET is selected.
+ *
+ * Input Parameters:
+ * status - Status information provided with the reset event. This
+ * meaning of this status information is board-specific. If not
+ * used by a board, the value zero may be provided in calls to
+ * board_reset().
+ *
+ * Returned Value:
+ * If this function returns, then it was not possible to power-off the
+ * board due to some constraints. The return value in this case is a
+ * board-specific reason for the failure to shutdown.
+ *
+ ****************************************************************************/
+
+int board_reset(int status)
+{
+ syslog(LOG_INFO, "reboot status=%d\n", status);
+
+ switch (status)
+ {
+ case EXIT_SUCCESS:
+ up_shutdown_handler();
+ break;
+ case CONFIG_BOARD_ASSERT_RESET_VALUE:
+ default:
+ break;
+ }
+
+ up_systemreset();
+
+ return 0;
+}
+
+#endif /* CONFIG_BOARDCTL_RESET */
