Solved
STM32L4 exit from Sleep/Low power sleep by UART RX ISR does not work
Hello, I'm trying to set up sleep mode and wake up from it by sending UART message to MCU.
However, MCU does not wake up.
Details:
UART baudrate - 115200
UArt set up in DMA mode, however, before going to sleep I activate RX in IT mode.
clocks setup:
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSI
|RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = 0;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_8;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig (&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_USART2
|RCC_PERIPHCLK_ADC;
PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_HSI;
PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
PeriphClkInit.AdcClockSelection = RCC_ADCCLKSOURCE_PLLSAI1;
PeriphClkInit.PLLSAI1.PLLSAI1Source = RCC_PLLSOURCE_HSI;
PeriphClkInit.PLLSAI1.PLLSAI1M = 1;
PeriphClkInit.PLLSAI1.PLLSAI1N = 8;
PeriphClkInit.PLLSAI1.PLLSAI1P = RCC_PLLP_DIV7;
PeriphClkInit.PLLSAI1.PLLSAI1Q = RCC_PLLQ_DIV2;
PeriphClkInit.PLLSAI1.PLLSAI1R = RCC_PLLR_DIV2;
PeriphClkInit.PLLSAI1.PLLSAI1ClockOut = RCC_PLLSAI1_ADC1CLK;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
/** Configure the main internal regulator output voltage
*/
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
{
Error_Handler();
}
}sleep procedure:
/* Ensure that MSI is wake-up system clock */
__HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_MSI);
/* Enable Power Clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* Enable Flash power down mode during Sleep mode */
/* (uncomment this line if power consumption figures */
/* must be measured with Flash still on in Low Power */
/* Sleep mode) */
__HAL_FLASH_SLEEP_POWERDOWN_ENABLE();
/* Reset all RCC Sleep and Stop modes register to */
/* improve power consumption */
RCC->AHB1SMENR = 0x0;
RCC->AHB2SMENR = 0x0;
RCC->AHB3SMENR = 0x0;
RCC->APB1SMENR1 = 0x0;
RCC->APB1SMENR2 = 0x0;
RCC->APB2SMENR = 0x0;
while (1)
{
/* USER CODE END WHILE */
print_debug_msg("Enter sleep mode", DEBUG_MSG);
HAL_Delay(4);
HAL_UART_Abort(&huart1);
/* Activate UART RX in IT mode */
HAL_UART_Receive_IT(&huart1, (uint8_t *)uart1_rx_buf, UART_BUF_SIZE);
/* Reduce the System clock to below 2 MHz */
__HAL_RCC_MSI_RANGE_CONFIG(RCC_MSIRANGE_0);
/* Suspend Tick increment to prevent wakeup by Systick interrupt. */
/* Otherwise the Systick interrupt will wake up the device within 1ms */
/* (HAL time base). */
HAL_SuspendTick();
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
/* ... Low-power SLEEP mode ... */
/* System is Low Power Run mode when exiting Low Power Sleep mode,
disable low power run mode and reset the clock to initialization configuration */
HAL_PWREx_DisableLowPowerRunMode();
SystemClock_Config();
/* Resume Tick interrupt if disabled prior to Low Power Sleep mode entry */
HAL_ResumeTick();
print_debug_msg("Exit sleep mode", DEBUG_MSG);
}When MCU goes into sleep mode I send a message over UART and expect it to wake from UART RX ISR, which was activate in UART init fct:
HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART1_IRQn);Any suggestions?