STM32L0 UART/LPUART wake from STOP MODE

[buff thokoa]

Hi,

I am using the MX Cube example in STM32Cube_FW_L0_V1.12.0\Projects\32L0538DISCOVERY\Examples\UART\LPUART_WakeUpFromStop.

I have modified it to use the STM32L0538NUCLEO BSP and to use USART2.

I had to add a HAL_SuspendTick in order to get into STOP mode.

All of that is working and I can get into stop mode. I am then trying to use a terminal to wake up the unit which never works.

Is there something else that has to be done to wake up the MCU via UART in stop mode??

I have added my code

[buff thokoa · Accepted solution]

This has been resolved...

The problem was the peripheral clock selection had not been updated

 PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USART2;

 PeriphClkInitStruct.Usart2ClockSelection = RCC_USART2CLKSOURCE_HSI;

[Imen.D]

Thanks @buff thokoa​  for sharing your solution 🙂

I marked your answer as Best, this will help other users find that answer faster.

Imen