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drivers: serial: stm32u5: Serial wakeup is based on autonomous capability #65532

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Nov 21, 2023
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drivers: serial: stm32u5: Serial wakeup is based on autonomous capability #65532

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bf3ed19
drivers: serial: stm32u5: Serial wakeup is based on autonomous capabi…
erwango Nov 21, 2023
b7dfad2
samples: stm32: serial_wakeup: b_u585i_iot02a support
erwango Nov 21, 2023
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8 changes: 5 additions & 3 deletions drivers/serial/uart_stm32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1279,7 +1279,8 @@ static void uart_stm32_isr(const struct device *dev)
uart_stm32_err_check(dev);
#endif /* CONFIG_UART_ASYNC_API */

#ifdef CONFIG_PM
#if defined(CONFIG_PM) && defined(IS_UART_WAKEUP_FROMSTOP_INSTANCE) \
&& defined(USART_CR3_WUFIE)
if (LL_USART_IsEnabledIT_WKUP(config->usart) &&
LL_USART_IsActiveFlag_WKUP(config->usart)) {

Expand Down Expand Up @@ -2017,13 +2018,14 @@ static int uart_stm32_init(const struct device *dev)
* CONFIG_PM_DEVICE=n : Always active
* CONFIG_PM_DEVICE=y : Controlled by pm_device_wakeup_enable()
*/

#ifdef USART_CR3_WUFIE
LL_USART_Disable(config->usart);
LL_USART_SetWKUPType(config->usart, LL_USART_WAKEUP_ON_RXNE);
LL_USART_EnableIT_WKUP(config->usart);
LL_USART_ClearFlag_WKUP(config->usart);
LL_USART_EnableInStopMode(config->usart);
LL_USART_Enable(config->usart);
#endif
LL_USART_EnableInStopMode(config->usart);

if (config->wakeup_line != STM32_EXTI_LINE_NONE) {
/* Prepare the WAKEUP with the expected EXTI line */
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34 changes: 34 additions & 0 deletions samples/boards/stm32/power_mgmt/serial_wakeup/boards/b_u585i_iot02a.overlay
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Original file line number Diff line number Diff line change
@@ -0,0 +1,34 @@
/*
* Copyright (c) 2023 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/

&cpu0{
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/* USART Wakeup requires automatic HSI16 switch on in deepsleep mode
* which isn't possible in Stop Mode 2.
* Remove Stop Mode 2 from supported modes
*/
cpu-power-states = <&stop0 &stop1>;
};

&usart1 {
/* Set domain clock to HSI to allow wakeup from Stop mode */
clocks = <&rcc STM32_CLOCK_BUS_APB2 0x00004000>,
<&rcc STM32_SRC_HSI16 USART1_SEL(2)>;

/* Configure device as wakeup source */
wakeup-source;

/* Configure sleep pinctrl configuration which will be used when
* device is not configured as wakeup source by the application.
* This use case is only applicable in PM_DEVICE mode.
*/
pinctrl-1 = <&analog_pa9 &analog_pa10>;
pinctrl-names = "default", "sleep";
};

&clk_hsi {
/* Make sure HSI is enabled */
status = "okay";
};
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