Commit 3dabe035 authored by Adam Berlinger's avatar Adam Berlinger Committed by Anas Nashif
Browse files

samples: boards: stm32: Add example for STOP3 mode on STM32U5 



Simple blinky example, but using STOP3 mode. When in STOP3 mode,
GPIOs are not driven, but only pull-up or pull-down can be enabled
based on value in PWR registers.

Signed-off-by: default avatarAdam Berlinger <adam.berlinger@st.com>
parent 19b39406

boards/st/nucleo_u575zi_q/nucleo_u575zi_q-common.dtsi

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@@ -199,3 +199,13 @@ zephyr_udc0: &usbotg_fs { 
&vbat4 {

	status = "okay";

};



&clk_lsi {

	status = "okay";

};



stm32_lp_tick_source: &lptim1 {

	clocks = <&rcc STM32_CLOCK_BUS_APB3 0x00000800>,

		 <&rcc STM32_SRC_LSI LPTIM1_SEL(1)>;

	status = "okay";

};

samples/boards/stm32/power_mgmt/stop3/CMakeLists.txt

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# SPDX-License-Identifier: Apache-2.0



cmake_minimum_required(VERSION 3.20.0)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})

project(stm32_pm_stop3)



target_sources(app PRIVATE src/main.c)

samples/boards/stm32/power_mgmt/stop3/README.rst

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.. _stm32-pm-stop3:



STM32 PM STOP3 mode

###################



Overview

********



This sample is a minimum application to demonstrate basic power management

behavior in a basic blinking LED set up and STM32U5 STOP3 low power mode.



.. _stm32-pm-stop3-requirements:



Requirements

************



At the moment, only ``nucleo_u575zi_q`` board is supported.

The board shall have an RTC to use it during the standby mode as a replacement

for LPTIM (which is disabled).



Building and Running

********************



Build and flash examples as follows:



.. zephyr-app-commands::

   :zephyr-app: samples/boards/stm32/power_mgmt/stop3

   :board: nucleo_u575zi_q

   :goals: build flash

   :compact:



After flashing, the LED starts to blink.



PM configurations

*****************



By default, :kconfig:option:`CONFIG_PM_DEVICE` and :kconfig:option:`CONFIG_PM_DEVICE_RUNTIME`

are enabled.

samples/boards/stm32/power_mgmt/stop3/boards/nucleo_u575zi_q.overlay

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/*

 * SPDX-License-Identifier: Apache-2.0

 *

 * Copyright (c) 2024 STMicroelectronics

 */



/ {

	chosen {

		st,lptim-stdby-timer = &rtc;

	};

};



&cpu0 {

	cpu-power-states = <&stop0 &stop1 &stop2 &stop3>;

};



&rtc {

	status = "okay";

	clocks = <&rcc STM32_CLOCK_BUS_APB3 0x00200000>,

			<&rcc STM32_SRC_LSI RTC_SEL(2)>;

	prescaler = <32768>;

};

samples/boards/stm32/power_mgmt/stop3/prj.conf

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CONFIG_PM=y

CONFIG_PM_DEVICE=y

CONFIG_PM_DEVICE_RUNTIME=y

CONFIG_PM_DEVICE_RUNTIME_EXCLUSIVE=n

CONFIG_ASSERT=y

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