Posted on March 08, 2017 at 17:10I'm developping an application based on STM32L475. In this application I'm controlling a device that is managed via UART2 interface with AT commands. This device is correctly working in run mode but problem comes when working in Stop1 mode. I use UART2 with interrupts but, when going to Stop1 mode, are the functions 'HAL_UART_TxCpltCallback' and 'HAL_UART_RxCpltCallback' also working? Which is the functionality of the 'HAL_UARTEx_WakeupCallback' function?
Please, find here below a piece of my code when implementation to go to Stop1 mode is implemented (note, that I2C also wakes up device from Stop1 mode and it is correctly working):
......
/* Ensure that HSI is wake-up system clock => per poder despertar de Stop1 a causa de I2C o UART */
__HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_HSI);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
// Full equipment functionality
Tasques();
&sharpifndef EN_DEBUG
if((HAL_I2C_GetState(&H_i2c1)==HAL_I2C_STATE_READY))&&(__HAL_UART_GET_FLAG(&H_uart2, USART_ISR_BUSY) == RESET)&&(__HAL_UART_GET_FLAG(&H_uart2, USART_ISR_REACK) == SET))
{
//I2C enabled to wake up from Stop1
HAL_I2CEx_EnableWakeUp(&H_i2c1);
//UART enabled to wake up from Stop1
/* set the wake-up event:
* specify wake-up on RXNE flag */
WakeUpSelection_UART.WakeUpEvent=UART_WAKEUP_ON_READDATA_NONEMPTY;
if (HAL_UARTEx_StopModeWakeUpSourceConfig(&H_uart2, WakeUpSelection_UART)!= HAL_OK)
{
Error_Handler();
}
/* Enable the UART Wake UP from STOP1 mode Interrupt */
__HAL_UART_ENABLE_IT(&H_uart2, UART_IT_WUF);
/* enable MCU wake-up by UART */
HAL_UARTEx_EnableStopMode(&H_uart2);
//Stop1
HAL_PWREx_EnterSTOP1Mode(PWR_STOPENTRY_WFI);
SYSCLKConfig_STOP();
}
&sharpendif
/* USER CODE BEGIN 3 */
}
..........
#stop1 #stm32l4 #uart
