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new 1eb4ec6d494 boards/nucleo-g0b1re: Add USB device configurations
1eb4ec6d494 is described below
commit 1eb4ec6d4947ef1502c2e51ec225ec42f8c787e7
Author: jsanchez-2g <[email protected]>
AuthorDate: Thu Aug 20 13:30:31 2026 -0500
boards/nucleo-g0b1re: Add USB device configurations
Add HSI48 clock selection, USB pull-up control, automatic CDC/ACM
registration during board bring-up, USB test configurations, and board
documentation.
Assisted-by: OpenAI Codex
Signed-off-by: jsanchez-2g <[email protected]>
---
.../arm/stm32g0/boards/nucleo-g0b1re/index.rst | 16 ++++++
.../nucleo-g0b1re/configs/usb-cdc/defconfig | 59 ++++++++++++++++++++++
.../nucleo-g0b1re/configs/usb-clocks/defconfig | 54 ++++++++++++++++++++
boards/arm/stm32g0/nucleo-g0b1re/include/board.h | 9 ++++
boards/arm/stm32g0/nucleo-g0b1re/src/stm32_boot.c | 55 ++++++++++++++++++++
.../arm/stm32g0/nucleo-g0b1re/src/stm32_bringup.c | 11 ++++
6 files changed, 204 insertions(+)
diff --git a/Documentation/platforms/arm/stm32g0/boards/nucleo-g0b1re/index.rst
b/Documentation/platforms/arm/stm32g0/boards/nucleo-g0b1re/index.rst
index 648d4a66d05..e6a744017ce 100644
--- a/Documentation/platforms/arm/stm32g0/boards/nucleo-g0b1re/index.rst
+++ b/Documentation/platforms/arm/stm32g0/boards/nucleo-g0b1re/index.rst
@@ -55,3 +55,19 @@ nsh:
This configuration provides a basic NuttShell configuration (NSH) on the
Nucleo virtual console (VCOM on UART2).
+
+usb-clocks:
+-----------
+
+This configuration enables the STM32G0 USB device controller and its HSI48
+clock source. It provides NSH on the Nucleo virtual console but does not
+register a USB device class.
+
+usb-cdc:
+--------
+
+This configuration extends ``usb-clocks`` with the CDC/ACM serial device
+class and the ``sercon`` and ``serdis`` commands. Connect an external USB
+device connector to PA11 (USB DM) and PA12 (USB DP). The CDC/ACM device is
+registered during board bring-up and enumerates when connected to the host.
+Run ``serdis`` to disconnect it and ``sercon`` to connect it again.
diff --git a/boards/arm/stm32g0/nucleo-g0b1re/configs/usb-cdc/defconfig
b/boards/arm/stm32g0/nucleo-g0b1re/configs/usb-cdc/defconfig
new file mode 100644
index 00000000000..6db323eac14
--- /dev/null
+++ b/boards/arm/stm32g0/nucleo-g0b1re/configs/usb-cdc/defconfig
@@ -0,0 +1,59 @@
+#
+# 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_ARCH="arm"
+CONFIG_ARCH_BOARD="nucleo-g0b1re"
+CONFIG_ARCH_BOARD_NUCLEO_G0B1RE=y
+CONFIG_ARCH_CHIP="stm32g0"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32G0=y
+CONFIG_ARCH_CHIP_STM32G0B1RE=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=4164
+CONFIG_BUILTIN=y
+CONFIG_CDCACM=y
+CONFIG_CDCACM_RXBUFSIZE=256
+CONFIG_CDCACM_TXBUFSIZE=256
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEBUG_USB=y
+CONFIG_DISABLE_ENVIRON=y
+CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_POSIX_TIMERS=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=1536
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LINE_MAX=64
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=64
+CONFIG_NSH_READLINE=y
+CONFIG_NUNGET_CHARS=0
+CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE=1536
+CONFIG_PTHREAD_MUTEX_UNSAFE=y
+CONFIG_PTHREAD_STACK_DEFAULT=1536
+CONFIG_RAM_SIZE=147456
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=19
+CONFIG_START_MONTH=5
+CONFIG_START_YEAR=2013
+CONFIG_STDIO_DISABLE_BUFFERING=y
+CONFIG_STM32_PWR=y
+CONFIG_STM32_USART2=y
+CONFIG_STM32_USB=y
+CONFIG_SYSTEM_CDCACM=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USART2_SERIAL_CONSOLE=y
+CONFIG_USBDEV_TRACE=y
+CONFIG_USBDEV_TRACE_STRINGS=y
diff --git a/boards/arm/stm32g0/nucleo-g0b1re/configs/usb-clocks/defconfig
b/boards/arm/stm32g0/nucleo-g0b1re/configs/usb-clocks/defconfig
new file mode 100644
index 00000000000..992ffd6962a
--- /dev/null
+++ b/boards/arm/stm32g0/nucleo-g0b1re/configs/usb-clocks/defconfig
@@ -0,0 +1,54 @@
+#
+# 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_ARCH="arm"
+CONFIG_ARCH_BOARD="nucleo-g0b1re"
+CONFIG_ARCH_BOARD_NUCLEO_G0B1RE=y
+CONFIG_ARCH_CHIP="stm32g0"
+CONFIG_ARCH_CHIP_STM32=y
+CONFIG_ARCH_CHIP_STM32G0=y
+CONFIG_ARCH_CHIP_STM32G0B1RE=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_BOARD_LOOPSPERMSEC=4164
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DISABLE_ENVIRON=y
+CONFIG_DISABLE_MOUNTPOINT=y
+CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_POSIX_TIMERS=y
+CONFIG_DISABLE_PSEUDOFS_OPERATIONS=y
+CONFIG_EXAMPLES_HELLO=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=1536
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LINE_MAX=64
+CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=64
+CONFIG_NSH_READLINE=y
+CONFIG_NUNGET_CHARS=0
+CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE=1536
+CONFIG_PTHREAD_MUTEX_UNSAFE=y
+CONFIG_PTHREAD_STACK_DEFAULT=1536
+CONFIG_RAM_SIZE=147456
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=19
+CONFIG_START_MONTH=5
+CONFIG_START_YEAR=2013
+CONFIG_STDIO_DISABLE_BUFFERING=y
+CONFIG_STM32_PWR=y
+CONFIG_STM32_USART2=y
+CONFIG_STM32_USB=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USART2_SERIAL_CONSOLE=y
diff --git a/boards/arm/stm32g0/nucleo-g0b1re/include/board.h
b/boards/arm/stm32g0/nucleo-g0b1re/include/board.h
index 6120aad294e..1d1997ca78e 100644
--- a/boards/arm/stm32g0/nucleo-g0b1re/include/board.h
+++ b/boards/arm/stm32g0/nucleo-g0b1re/include/board.h
@@ -53,6 +53,15 @@
#define STM32_HSE_FREQUENCY STM32_BOARD_XTAL
#define STM32_LSE_FREQUENCY 32768 /* X2 on board */
+/* 48MHz clock configuration. HSI48 is the only 48MHz source on STM32G0 and
+ * is trimmed by the CRS from the USB start of frame packet.
+ */
+
+#if defined(CONFIG_STM32_USB) || defined(CONFIG_STM32_RNG)
+# define STM32_USE_CLK48 1
+# define STM32_HSI48_SYNCSRC SYNCSRC_USB
+#endif
+
/* Main PLL Configuration.
*
* PLL source is HSI = 16,000,000
diff --git a/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_boot.c
b/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_boot.c
index 231a9256892..b971f5b68af 100644
--- a/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_boot.c
+++ b/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_boot.c
@@ -26,9 +26,16 @@
#include <nuttx/config.h>
+#include <stdbool.h>
+
#include <nuttx/board.h>
+#include <nuttx/irq.h>
+#include <nuttx/usb/usbdev.h>
#include <arch/board/board.h>
+#include "arm_internal.h"
+#include "hardware/stm32_usbdev.h"
+#include "stm32_usbdev.h"
#include "nucleo-g0b1re.h"
/****************************************************************************
@@ -61,6 +68,54 @@ void stm32_boardinitialize(void)
#endif
}
+#if defined(CONFIG_STM32_USB) && defined(CONFIG_USBDEV)
+
+/****************************************************************************
+ * Name: stm32_usb_setpullup
+ *
+ * Description:
+ * Drive the embedded DP pull-up, which connects the device to the host.
+ *
+ ****************************************************************************/
+
+int stm32_usb_setpullup(bool enable)
+{
+ irqstate_t flags;
+ uint32_t regval;
+
+ flags = enter_critical_section();
+ regval = getreg32(STM32_USB_BCDR);
+
+ if (enable)
+ {
+ regval |= USB_BCDR_DPPU;
+ }
+ else
+ {
+ regval &= ~USB_BCDR_DPPU;
+ }
+
+ putreg32(regval, STM32_USB_BCDR);
+ leave_critical_section(flags);
+
+ return OK;
+}
+
+bool stm32_usb_pullup_enabled(void)
+{
+ return (getreg32(STM32_USB_BCDR) & USB_BCDR_DPPU) != 0;
+}
+
+int stm32_usbpullup(FAR struct usbdev_s *dev, bool enable)
+{
+ return stm32_usb_setpullup(enable);
+}
+
+void stm32_usbsuspend(FAR struct usbdev_s *dev, bool resume)
+{
+}
+#endif
+
/****************************************************************************
* Name: board_late_initialize
*
diff --git a/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_bringup.c
b/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_bringup.c
index d852c55b2a2..ac8455443ae 100644
--- a/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_bringup.c
+++ b/boards/arm/stm32g0/nucleo-g0b1re/src/stm32_bringup.c
@@ -34,6 +34,7 @@
#include <nuttx/board.h>
#include <nuttx/input/buttons.h>
#include <nuttx/leds/userled.h>
+#include <nuttx/usb/cdcacm.h>
#include <arch/board/board.h>
#include "nucleo-g0b1re.h"
@@ -73,6 +74,16 @@ int stm32_bringup(void)
{
int ret;
+#if defined(CONFIG_CDCACM) && !defined(CONFIG_CDCACM_CONSOLE)
+ /* Register the CDC/ACM device at boot. */
+
+ ret = cdcacm_initialize(0, NULL);
+ if (ret < 0)
+ {
+ syslog(LOG_ERR, "ERROR: cdcacm_initialize failed: %d\n", ret);
+ }
+#endif
+
#ifdef HAVE_LEDS
/* Register the LED driver */
