zephyr

History

Keith Packard 0b90fd5adf samples, tests, boards: Switch main return type from void to int As both C and C++ standards require applications running under an OS to return 'int', adapt that for Zephyr to align with those standard. This also eliminates errors when building with clang when not using -ffreestanding, and reduces the need for compiler flags to silence warnings for both clang and gcc. Most of these changes were automated using coccinelle with the following script: @@ @@ - void + int main(...) { ... - return; + return 0; ... } Approximately 40 files had to be edited by hand as coccinelle was unable to fix them. Signed-off-by: Keith Packard <keithp@keithp.com>		2023-04-14 07:49:41 +09:00
..
boards	dts: arm: st: Remove obsolete properties for all STM32 ADC from dts	2023-01-25 15:00:21 +00:00
src	samples, tests, boards: Switch main return type from void to int	2023-04-14 07:49:41 +09:00
CMakeLists.txt
prj.conf
README.rst
sample.yaml	tests/samples: use integration_plaforms in more tests/samples	2022-11-29 16:03:23 +01:00

README.rst

.. _stm32_vbat_sensor:

STM32 VBat Sensor
#################

Overview
********

This sample reads the Vbat from the STM32 Internal
Sensor and displays the results.

Building and Running
********************

In order to run this sample, make sure to enable ``stm32_vbat`` node in your
board DT file or with a board overlay in the samples/sensor/stm32_temp_sensor/boards :


.. code-block:: dts

    stm32_vbat: stm32vbat {
        compatible = "st,stm32-vbat";
        io-channels = <&adc1 14>;
        ratio = <3>;
        status = "okay";
    };


Enable the corresponding ADC, with the correct vref value (in mV)

.. code-block:: dts

    &adc1 {
	vref-mv = <3000>;
	status = "okay";
    };


.. zephyr-app-commands::
   :zephyr-app: samples/sensor/stm32_vbat_sensor
   :board: nucleo_g071rb
   :goals: build
   :compact:

Sample Output
=============

.. code-block:: console

   Current Vbat voltage: 3.04 V