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commit 65a1279e306cfd8905cc90c1b65dc0975ae4db2d Author: jsanchez-2g <[email protected]> AuthorDate: Wed Aug 19 16:09:49 2026 -0500 docs/boards: Document the Nucleo L073RZ USB CDC configuration. Document the USART2 NSH console, USB FS pins, HSI48/CRS clock source and the usb-cdc configuration that exposes a separate USB CDC/ACM serial device. Assisted-by: GitHub Copilot:claude-opus-5 Signed-off-by: jsanchez-2g <[email protected]> --- .../arm/stm32l0/boards/nucleo-l073rz/index.rst | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/Documentation/platforms/arm/stm32l0/boards/nucleo-l073rz/index.rst b/Documentation/platforms/arm/stm32l0/boards/nucleo-l073rz/index.rst index 3000df30ae2..201ead1d850 100644 --- a/Documentation/platforms/arm/stm32l0/boards/nucleo-l073rz/index.rst +++ b/Documentation/platforms/arm/stm32l0/boards/nucleo-l073rz/index.rst @@ -7,3 +7,33 @@ ST Nucleo L073RZ .. tags:: chip:stm32, chip:stm32l0, chip:stm32l073 The Nucleo L073RZ is a member of the Nucleo-64 board family. + +Serial Console +============== + +The ``nsh`` and ``usb-cdc`` configurations use USART2 as the NSH console at +115200 8N1 through the ST-LINK virtual COM port. + +USB Device +========== + +The STM32L073RZ USB FS device interface uses PA11 for USB_DM and PA12 for +USB_DP. The ``usb-cdc`` configuration uses the internal HSI48 oscillator as +the 48 MHz USB clock. The clock recovery system synchronizes HSI48 from USB +start of frame packets, so no external 48 MHz crystal is required. + +Configurations +============== + +Each configuration is maintained in a sub-directory and selected with:: + + tools/configure.sh nucleo-l073rz:<subdir> + +nsh: +---- +Configures the NuttShell (NSH) on USART2. + +usb-cdc: +-------- +Configures NSH on USART2 and exposes a separate USB CDC/ACM serial device on +the USB FS connector.
