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acassis pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git
The following commit(s) were added to refs/heads/master by this push:
new 3ba6047e294 drivers/sensors/tmp112: Add support for TMP112 temperature
sensor
3ba6047e294 is described below
commit 3ba6047e2940f84d0e24bee2fb84be20cb5c8ef3
Author: Niccolò Maggioni <nicco.maggi...@gmail.com>
AuthorDate: Mon Aug 11 14:19:07 2025 +0200
drivers/sensors/tmp112: Add support for TMP112 temperature sensor
Add support for the Texas Instruments TMP112 I2C/SMBus digital
temperature sensor. Also add a new defconfig that includes
support for a TMP112 sensor and extend the existing documentation
to include its description.
Signed-off-by: Niccolò Maggioni <nicco.maggioni+nu...@gmail.com>
---
.../arm/rp2040/boards/raspberrypi-pico/index.rst | 66 +++--
boards/arm/rp2040/common/include/rp2040_tmp112.h | 89 ++++++
boards/arm/rp2040/common/src/Make.defs | 4 +
.../arm/rp2040/common/src/rp2040_common_bringup.c | 17 ++
boards/arm/rp2040/common/src/rp2040_tmp112.c | 105 +++++++
.../raspberrypi-pico/configs/tmp112/defconfig | 58 ++++
drivers/sensors/CMakeLists.txt | 4 +
drivers/sensors/Kconfig | 15 +
drivers/sensors/Make.defs | 4 +
drivers/sensors/tmp112.c | 304 +++++++++++++++++++++
include/nuttx/sensors/tmp112.h | 117 ++++++++
11 files changed, 764 insertions(+), 19 deletions(-)
diff --git
a/Documentation/platforms/arm/rp2040/boards/raspberrypi-pico/index.rst
b/Documentation/platforms/arm/rp2040/boards/raspberrypi-pico/index.rst
index 955fa88b7d9..020fb24beac 100644
--- a/Documentation/platforms/arm/rp2040/boards/raspberrypi-pico/index.rst
+++ b/Documentation/platforms/arm/rp2040/boards/raspberrypi-pico/index.rst
@@ -48,34 +48,34 @@ Pad Signal Notes
===== ========== ==========
1 GPIO0 Default TX for UART0 serial console
2 GPIO1 Default RX for UART0 serial console
-3 Ground
-4 GPIO2
-5 GPIO3
+3 Ground
+4 GPIO2
+5 GPIO3
6 GPIO4 Default SDA for I2C0
7 GPIO5 Default SCL for I2C0
-8 Ground
+8 Ground
9 GPIO6 Default SDA for I2C1
10 GPIO7 Default SCL for I2C1
11 GPIO8 Default RX for SPI1
12 GPIO9 Default CSn for SPI1
-13 Ground
+13 Ground
14 GPIO10 Default SCK for SPI1
15 GPIO11 Default TX for SPI1
-16 GPIO12
-17 GPIO13
-18 Ground
-19 GPIO14
-20 GPIO15
+16 GPIO12
+17 GPIO13
+18 Ground
+19 GPIO14
+20 GPIO15
21 GPIO16 Default RX for SPI0
22 GPIO17 Default CSn for SPI0
-23 Ground
+23 Ground
24 GPIO18 Default SCK for SPI0
25 GPIO19 Default TX for SPI0
26 GPIO20 Default TX for UART1 serial console
27 GPIO21 Default RX for UART1 serial console
-28 Ground
-29 GPIO22
-30 Run
+28 Ground
+29 GPIO22
+30 Run
31 GPIO26 ADC0
32 GPIO27 ADC1
33 AGND Analog Ground
@@ -83,7 +83,7 @@ Pad Signal Notes
35 ADC_VREF Analog reference voltage
36 3V3 Power output to peripherals
37 3V3_EN Pull to ground to turn off.
-38 Ground
+38 Ground
39 VSYS +5V Supply to board
40 VBUS Connected to USB +5V
===== ========== ==========
@@ -217,7 +217,7 @@ LCD1602 Segment LCD Display (I2C).
:widths: auto
:header-rows: 1
- * - PCF8574 BackPack
+ * - PCF8574 BackPack
- Raspberry Pi Pico
* - GND
- GND (Pin 3 or 38 or ...)
@@ -263,7 +263,7 @@ card support enabled.
* - SD card slot
- Raspberry Pi Pico
- * - DAT2
+ * - DAT2
- Not connected
* - DAT3/CS
- GP17 (SPI0 CSn) (Pin 22)
@@ -277,7 +277,7 @@ card support enabled.
- GND (Pin 3 or 38 or ...)
* - DAT0/DO
- GP16 (SPI0 RX) (Pin 21)
- * - DAT1
+ * - DAT1
- Not connected
Card hot swapping is not supported.
@@ -300,7 +300,7 @@ for SSD1306 OLED display (I2C) test configuration.
- 3V3 OUT (Pin 36)
* - SDA
- GP4 (I2C0 SDA) (Pin 6)
- * - SCL
+ * - SCL
- GP5 (I2C0 SCL) (Pin 7)
st7735
@@ -332,6 +332,34 @@ ST7735 SPI LCD.
* - RESET
- GP10 (Pin 14)
+tmp112
+------
+
+NuttShell configuration (console enabled in USB Port, at 115200 bps) with
support for Texas Instruments TMP112 sensor:
+
+.. list-table:: TMP112 connections
+ :widths: auto
+ :header-rows: 1
+
+ * - TMP112
+ - Raspberry Pi Pico
+ * - GND
+ - GND (Pin 3 or 38 or ...)
+ * - VCC
+ - 3V3 OUT (Pin 36)
+ * - SDA
+ - GP4 (I2C0 SDA) (Pin 6)
+ * - SCL
+ - GP5 (I2C0 SCL) (Pin 7)
+ * - ADD0
+ - GND (Pin 3 or 38 or ...)
+
+.. code-block:: console
+
+ nsh> tmp112
+ Sensor #1 = 27.688 degrees Celsius
+ nsh>
+
usbmsc
------
diff --git a/boards/arm/rp2040/common/include/rp2040_tmp112.h
b/boards/arm/rp2040/common/include/rp2040_tmp112.h
new file mode 100644
index 00000000000..657cbe04047
--- /dev/null
+++ b/boards/arm/rp2040/common/include/rp2040_tmp112.h
@@ -0,0 +1,89 @@
+/****************************************************************************
+ * boards/arm/rp2040/common/include/rp2040_tmp112.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_ARM_RP2040_COMMON_INCLUDE_RP2040_TMP112_H
+#define __BOARDS_ARM_RP2040_COMMON_INCLUDE_RP2040_TMP112_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/i2c/i2c_master.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Inline Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_tmp112_initialize
+ *
+ * Description:
+ * Initialize and register the TMP112 temperature sensor driver.
+ *
+ * Input Parameters:
+ * i2c - An instance of the I2C interface to use.
+ * devno - The device number, used to build the device path as /dev/tempN.
+ * addr - The I2C address to use.
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_tmp112_initialize(FAR struct i2c_master_s *i2c, int devno,
+ uint8_t addr);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __BOARDS_ARM_RP2040_COMMON_INCLUDE_RP2040_TMP112_H */
diff --git a/boards/arm/rp2040/common/src/Make.defs
b/boards/arm/rp2040/common/src/Make.defs
index e6c4e73d5ad..c7c0fef41ba 100644
--- a/boards/arm/rp2040/common/src/Make.defs
+++ b/boards/arm/rp2040/common/src/Make.defs
@@ -109,6 +109,10 @@ ifeq ($(CONFIG_SENSORS_MAX6675),y)
CSRCS += rp2040_max6675.c
endif
+ifeq ($(CONFIG_SENSORS_TMP112),y)
+ CSRCS += rp2040_tmp112.c
+endif
+
DEPPATH += --dep-path src
VPATH += :src
CFLAGS +=
${INCDIR_PREFIX}$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)src
diff --git a/boards/arm/rp2040/common/src/rp2040_common_bringup.c
b/boards/arm/rp2040/common/src/rp2040_common_bringup.c
index e91f5e6563d..8536f24adf5 100644
--- a/boards/arm/rp2040/common/src/rp2040_common_bringup.c
+++ b/boards/arm/rp2040/common/src/rp2040_common_bringup.c
@@ -90,6 +90,12 @@
#include "rp2040_max6675.h"
#endif
+#ifdef CONFIG_SENSORS_TMP112
+#include <nuttx/sensors/tmp112.h>
+#include "rp2040_tmp112.h"
+#include "rp2040_i2c.h"
+#endif
+
#ifdef CONFIG_RP2040_PWM
#include "rp2040_pwm.h"
#include "rp2040_pwmdev.h"
@@ -569,6 +575,17 @@ int rp2040_common_bringup(void)
}
#endif
+#ifdef CONFIG_SENSORS_TMP112
+ /* Try to register TMP112 device at I2C0 with a common address */
+
+ ret = board_tmp112_initialize(rp2040_i2cbus_initialize(0), 0,
+ TMP112_ADDR_1);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "Failed to initialize TMP112 driver: %d\n", ret);
+ }
+#endif
+
#ifdef CONFIG_VIDEO_FB
ret = fb_register(0, 0);
if (ret < 0)
diff --git a/boards/arm/rp2040/common/src/rp2040_tmp112.c
b/boards/arm/rp2040/common/src/rp2040_tmp112.c
new file mode 100644
index 00000000000..8fcbea6e33d
--- /dev/null
+++ b/boards/arm/rp2040/common/src/rp2040_tmp112.c
@@ -0,0 +1,105 @@
+/****************************************************************************
+ * boards/arm/rp2040/common/src/rp2040_tmp112.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/tmp112.h>
+
+#include "rp2040_i2c.h"
+#include "rp2040_tmp112.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_tmp112_initialize
+ *
+ * Description:
+ * Initialize and register the TMP112 temperature sensor driver.
+ *
+ * Input Parameters:
+ * i2c - An instance of the I2C interface to use.
+ * devno - The device number, used to build the device path as /dev/tempN.
+ * addr - The I2C address to use.
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int board_tmp112_initialize(FAR struct i2c_master_s *i2c, int devno,
+ uint8_t addr)
+{
+ char devpath[11];
+ int ret;
+
+ sninfo("Initializing TMP112 with address %#4x\n", addr);
+
+ if (i2c)
+ {
+ snprintf(devpath, sizeof(devpath), "/dev/temp%d", devno);
+ ret = tmp112_register(devpath, i2c, addr);
+ if (ret < 0)
+ {
+ snerr("ERROR: Error registering TMP112 at /dev/temp%d\n", devno);
+ }
+ }
+ else
+ {
+ ret = -ENODEV;
+ }
+
+ return ret;
+}
diff --git a/boards/arm/rp2040/raspberrypi-pico/configs/tmp112/defconfig
b/boards/arm/rp2040/raspberrypi-pico/configs/tmp112/defconfig
new file mode 100644
index 00000000000..06db48e6e5e
--- /dev/null
+++ b/boards/arm/rp2040/raspberrypi-pico/configs/tmp112/defconfig
@@ -0,0 +1,58 @@
+#
+# 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_DEV_CONSOLE is not set
+# CONFIG_LIBC_LONG_LONG is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+# CONFIG_NSH_DISABLE_DATE is not set
+# CONFIG_NSH_DISABLE_LOSMART is not set
+# CONFIG_RP2040_UART0 is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="raspberrypi-pico"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_RASPBERRYPI_PICO=y
+CONFIG_ARCH_CHIP="rp2040"
+CONFIG_ARCH_CHIP_RP2040=y
+CONFIG_ARCH_RAMVECTORS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARDCTL_RESET=y
+CONFIG_BOARD_LOOPSPERMSEC=10450
+CONFIG_BUILTIN=y
+CONFIG_CDCACM=y
+CONFIG_CDCACM_CONSOLE=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DISABLE_POSIX_TIMERS=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_EXAMPLES_TMP112=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_PROCFS_REGISTER=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_LIBC_FLOATINGPOINT=y
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_READLINE=y
+CONFIG_NSH_USBCONSOLE=y
+CONFIG_RAM_SIZE=270336
+CONFIG_RAM_START=0x20000000
+CONFIG_READLINE_CMD_HISTORY=y
+CONFIG_RP2040_I2C0=y
+CONFIG_RP2040_I2C=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_SENSORS=y
+CONFIG_SENSORS_TMP112=y
+CONFIG_START_DAY=9
+CONFIG_START_MONTH=2
+CONFIG_START_YEAR=2021
+CONFIG_SYSTEM_NSH=y
+CONFIG_TESTING_GETPRIME=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_USBDEV=y
+CONFIG_USBDEV_BUSPOWERED=y
diff --git a/drivers/sensors/CMakeLists.txt b/drivers/sensors/CMakeLists.txt
index 9f4810a40ef..b3ca24e07b0 100644
--- a/drivers/sensors/CMakeLists.txt
+++ b/drivers/sensors/CMakeLists.txt
@@ -340,6 +340,10 @@ if(CONFIG_SENSORS)
list(APPEND SRCS amg88xx.c)
endif()
+ if(CONFIG_SENSORS_TMP112)
+ list(APPEND SRCS tmp112.c)
+ endif()
+
endif() # CONFIG_I2C
# These drivers depend on SPI support
diff --git a/drivers/sensors/Kconfig b/drivers/sensors/Kconfig
index c23cac7986f..0d630a22f92 100644
--- a/drivers/sensors/Kconfig
+++ b/drivers/sensors/Kconfig
@@ -2146,4 +2146,19 @@ config SENSORS_FS3000_THREAD_STACKSIZE
endif # SENSORS_FS3000
+config SENSORS_TMP112
+ bool "Texas Instruments TMP112x Temperature Sensor support"
+ default n
+ select I2C
+ ---help---
+ Enable driver support for the Texas Instruments TMP112x
temperature sensor.
+
+if SENSORS_TMP112
+
+config TMP112_I2C_FREQUENCY
+ int "TMP112 I2C frequency"
+ default 400000
+
+endif #SENSORS_TMP112
+
endif # SENSORS
diff --git a/drivers/sensors/Make.defs b/drivers/sensors/Make.defs
index d3d7e0f554e..870afeb40df 100644
--- a/drivers/sensors/Make.defs
+++ b/drivers/sensors/Make.defs
@@ -332,6 +332,10 @@ ifeq ($(CONFIG_SENSORS_BMM150),y)
CSRCS += bmm150_uorb.c
endif
+ifeq ($(CONFIG_SENSORS_TMP112),y)
+ CSRCS += tmp112.c
+endif
+
endif # CONFIG_I2C
# These drivers depend on SPI support
diff --git a/drivers/sensors/tmp112.c b/drivers/sensors/tmp112.c
new file mode 100644
index 00000000000..6cf70658252
--- /dev/null
+++ b/drivers/sensors/tmp112.c
@@ -0,0 +1,304 @@
+/****************************************************************************
+ * drivers/sensors/tmp112.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 <errno.h>
+#include <debug.h>
+#include <string.h>
+#include <time.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/kmalloc.h>
+#include <nuttx/signal.h>
+#include <nuttx/fs/fs.h>
+#include <nuttx/i2c/i2c_master.h>
+#include <nuttx/random.h>
+
+#include <nuttx/sensors/tmp112.h>
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct tmp112_dev_s
+{
+ FAR struct i2c_master_s *i2c; /* I2C interface */
+ uint8_t addr; /* TMP112 I2C address */
+ int freq; /* TMP112 Frequency */
+ uint16_t tmp112_temp_raw; /* Temperature as read from TMP112 */
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/* Character driver methods */
+
+static ssize_t tmp112_read(FAR struct file *filep, FAR char *buffer,
+ size_t buflen);
+
+static ssize_t tmp112_write(FAR struct file *filep, FAR const char *buffer,
+ size_t buflen);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct file_operations g_tmp112fops =
+{
+ NULL, /* open */
+ NULL, /* close */
+ tmp112_read, /* read */
+ tmp112_write, /* write */
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static uint16_t tmp112_getreg16(FAR struct tmp112_dev_s *priv,
+ uint8_t regaddr, uint8_t ms_delay)
+{
+ struct i2c_config_s config;
+ uint16_t msb;
+ uint16_t lsb;
+ uint16_t regval = 0;
+ int ret;
+
+ /* Set up the I2C configuration */
+
+ config.frequency = priv->freq;
+ config.address = priv->addr;
+ config.addrlen = 7;
+
+ /* Register to read */
+
+ ret = i2c_write(priv->i2c, &config, ®addr, 1);
+ if (ret < 0)
+ {
+ snerr("ERROR: i2c_write failed: %s (%d)\n", strerror(-ret), ret);
+ return ret;
+ }
+
+ if (ms_delay > 0)
+ {
+ nxsig_usleep(ms_delay * 1000);
+ }
+
+ /* Read register */
+
+ ret = i2c_read(priv->i2c, &config, (FAR uint8_t *)®val, 2);
+ if (ret < 0)
+ {
+ snerr("ERROR: i2c_read failed: %d\n", ret);
+ return ret;
+ }
+
+ /* MSB and LSB are inverted */
+
+ msb = (regval & 0xff);
+ lsb = (regval & 0xff00) >> 8;
+
+ regval = (msb << 4) | (lsb >> 4);
+
+ return regval;
+}
+
+static int tmp112_putreg16(FAR struct tmp112_dev_s *priv, uint8_t regaddr,
+ uint16_t regval)
+{
+ struct i2c_config_s config;
+ uint8_t data[3];
+ int ret;
+
+ /* Set up the I2C configuration */
+
+ config.frequency = priv->freq;
+ config.address = priv->addr;
+ config.addrlen = 7;
+
+ data[0] = regaddr;
+ data[1] = (regval >> 8) & 0xff;
+ data[2] = regval & 0xff;
+
+ /* Write the register address and value */
+
+ ret = i2c_write(priv->i2c, &config, (FAR uint8_t *)&data, 3);
+ if (ret < 0)
+ {
+ snerr("ERROR: i2c_write failed: %s (%d)\n", strerror(-ret), ret);
+ return ret;
+ }
+
+ return OK;
+}
+
+static int tmp112_writeconfig(FAR struct tmp112_dev_s *priv)
+{
+ /* Datasheet Table 7-10: Configuration and Power-Up/Reset Formats
+ * | BYTE | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
+ * |------|-----|-----|-----|-----|-----|-----|-----|-----|
+ * | 1 | OS | R1 | R0 | F1 | F0 | POL | TM | SD |
+ * | | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
+ * |------|-----|-----|-----|-----|-----|-----|-----|-----|
+ * | 2 | CR1 | CR0 | AL | EM | 0 | 0 | 0 | 0 |
+ * | | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
+ * |------|-----|-----|-----|-----|-----|-----|-----|-----|
+ */
+
+ /* Byte 1: set 12 bit resolution, Comparator mode, Continuous
+ * Conversion mode
+ */
+
+ const uint8_t b1 = 0b01100000;
+
+ /* Byte 2: set 4Hz conversion rate, non-Extended mode */
+
+ const uint8_t b2 = 0b10100000;
+
+ return tmp112_putreg16(priv, TMP112_REG_CONFIG, (b1 << 8) | b2);
+}
+
+static void tmp112_read_temp(FAR struct tmp112_dev_s *priv)
+{
+ /* Wait 1.5x typical conversion time (10ms) to ensure that the
+ * temperature register is primed and then read it.
+ */
+
+ uint16_t value = tmp112_getreg16(priv, TMP112_REG_TEMP, 15);
+
+ if (value >= UINT16_MAX - __ELASTERROR)
+ {
+ snerr("ERROR: Invalid temperature read\n");
+ priv->tmp112_temp_raw = 0;
+ }
+ else
+ {
+ priv->tmp112_temp_raw = value;
+ sninfo("Temperature (raw) = %" PRIu16 "\n", priv->tmp112_temp_raw);
+ }
+}
+
+static ssize_t tmp112_read(FAR struct file *filep, FAR char *buffer,
+ size_t buflen)
+{
+ FAR struct inode *inode = filep->f_inode;
+ FAR struct tmp112_dev_s *priv = inode->i_private;
+ FAR float *temperature = (FAR float *)buffer;
+
+ if (!buffer)
+ {
+ snerr("ERROR: Buffer is null\n");
+ return -1;
+ }
+
+ if (buflen != 4)
+ {
+ snerr("ERROR: You can't read something other than 32 bits "
+ "(4 bytes)\n");
+ return -1;
+ }
+
+ /* Refresh the temperature */
+
+ tmp112_read_temp(priv);
+
+ /* Get the temperature */
+
+ *temperature = (float)priv->tmp112_temp_raw * 0.0625f;
+
+ /* Return size of data (float, 4 bytes) */
+
+ return sizeof(float);
+}
+
+static ssize_t tmp112_write(FAR struct file *filep, FAR const char *buffer,
+ size_t buflen)
+{
+ return -ENOSYS;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: tmp112_register
+ *
+ * Description:
+ * Register the TMP112 character device as 'devpath'
+ *
+ * Input Parameters:
+ * devpath - The full path to the driver to register. E.g., "/dev/temp0"
+ * i2c - An instance of the I2C interface to use.
+ * addr - The I2C address to use.
+ * When multiple sensors are connected to the same bus, each one
+ * must be electrically configured to use a different I2C
+ * address as specified in the datasheet.
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int tmp112_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+ uint8_t addr)
+{
+ FAR struct tmp112_dev_s *priv;
+ int ret;
+
+ /* Initialize the TMP112 device structure */
+
+ priv = (FAR struct tmp112_dev_s *)kmm_malloc(sizeof(struct tmp112_dev_s));
+ if (!priv)
+ {
+ snerr("ERROR: Failed to allocate instance\n");
+ return -ENOMEM;
+ }
+
+ priv->i2c = i2c;
+ priv->addr = addr;
+ priv->freq = CONFIG_TMP112_I2C_FREQUENCY;
+
+ /* Write the configuration registers */
+
+ sninfo("Writing configuration\n");
+ tmp112_writeconfig(priv);
+
+ /* Register the character driver */
+
+ ret = register_driver(devpath, &g_tmp112fops, 0666, priv);
+ if (ret < 0)
+ {
+ snerr("ERROR: Failed to register driver: %d\n", ret);
+ kmm_free(priv);
+ }
+
+ sninfo("Driver loaded successfully\n");
+ return ret;
+}
diff --git a/include/nuttx/sensors/tmp112.h b/include/nuttx/sensors/tmp112.h
new file mode 100644
index 00000000000..f6821686146
--- /dev/null
+++ b/include/nuttx/sensors/tmp112.h
@@ -0,0 +1,117 @@
+/****************************************************************************
+ * include/nuttx/sensors/tmp112.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 __INCLUDE_NUTTX_SENSORS_TMP112_H
+#define __INCLUDE_NUTTX_SENSORS_TMP112_H
+
+#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_TMP112)
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/i2c/i2c_master.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define TMP112_REG_CONFIG 0x01
+#define TMP112_REG_TEMP 0x00
+
+/* Addresses for the Alert-only and Address+Alert versions of this IC.
+ * Typically include:
+ * - TMP112D0 (X2SON-5 package)
+ * - TMP112D1 (X2SON-5 package)
+ * - TMP112D2 (X2SON-5 package)
+ * - TMP112D3 (X2SON-5 package)
+ * - TMP112A (SOT563-6 package)
+ * - TMP112B (SOT563-6 package)
+ * - TMP112D (SOT563-6 package)
+ * - TMP112N (SOT563-6 package)
+ */
+
+#define TMP112_ADDR_1 0x48
+#define TMP112_ADDR_2 0x49
+#define TMP112_ADDR_3 0x4A
+#define TMP112_ADDR_4 0x4B
+
+/* Addresses for the Address-only version of this IC.
+ * Typically includes:
+ * - TMP112D (X2SON-5 package)
+ */
+
+#define TMP112_ALT_ADDR_1 0x40
+#define TMP112_ALT_ADDR_2 0x41
+#define TMP112_ALT_ADDR_3 0x42
+#define TMP112_ALT_ADDR_4 0x43
+
+/* Configuration ************************************************************/
+
+/* Prerequisites:
+ *
+ * CONFIG_SENSORS_TMP112
+ * Enables support for the TMP112 driver
+ */
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: tmp112_register
+ *
+ * Description:
+ * Register the TMP112 character device as 'devpath'
+ *
+ * Input Parameters:
+ * devpath - The full path to the driver to register. E.g., "/dev/temp0"
+ * i2c - An instance of the I2C interface to use.
+ * addr - The I2C address to use.
+ * When multiple sensors are connected to the same bus, each one
+ * must be electrically configured to use a different I2C
+ * address as specified in the datasheet.
+ *
+ * Returned Value:
+ * Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int tmp112_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+ uint8_t addr);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_I2C && CONFIG_SENSORS_TMP112 */
+#endif /* __INCLUDE_NUTTX_SENSORS_TMP112_H */
