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STM23L031F6P6‘s UART don't work after resume from STOP mode with RTC

jz.266
Associate

‎2018-10-25 01:34 AM

It's my first time to use STM23L031F6P6，and i got some troubles

both UART2 & LPUART​1 don't work after resume from STOP mode

is there somebody can help me？

main code shows below：

​

​

void test1(void)
{
    HAL_Init();        
    RTC_Config();    
   
    while(1)
    {
        SystemClock_Config();
        init();
        printf("------- wake up --------\r\n");
        LedOn(1);
        HAL_Delay(5000);
        LedOff(1);
        HAL_Delay(5000);
        
        printf("\r\n------- sleep --------\r\n");
        rtc_wakeup_cfg();      
        SystemPower_Config();
        HW_WakeupPinInit();
        enter_stop_mode();
    }    
}
 
void rtc_wakeup_cfg(void)
{
    HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle);
    HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, RTC_TIME, 
    RTC_WAKEUPCLOCK_CK_SPRE_16BITS);
}
 
void enter_stop_mode(void)
{
    __HAL_RCC_PWR_CLK_ENABLE();
    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
}
 
void HW_WakeupPinInit(void)
{   
    GPIO_InitTypeDef GPIO_InitStruct;
 
    GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING; 
   
    __HAL_RCC_GPIOA_CLK_ENABLE();
 
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    
    GPIO_InitStruct.Pin = GPIO_PIN_13 | GPIO_PIN_14;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
    
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);    
    
    NVIC_SetPriority((IRQn_Type)(EXTI4_15_IRQn), 0x03);
    HAL_NVIC_EnableIRQ((IRQn_Type)(EXTI4_15_IRQn));
}
 
void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct;
    RCC_ClkInitTypeDef RCC_ClkInitStruct;
    RCC_PeriphCLKInitTypeDef PeriphClkInit;
 
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.HSICalibrationValue = 16;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4;
    RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_2;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
        _Error_Handler(__FILE__, __LINE__);
    }
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
    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_1) != HAL_OK)
    {
        _Error_Handler(__FILE__, __LINE__);
    }
    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2|RCC_PERIPHCLK_LPUART1;
    PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
    PeriphClkInit.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_PCLK1;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
    {
        _Error_Handler(__FILE__, __LINE__);
    }
    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
    HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
    HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}
 
static void SystemPower_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
 
    __HAL_RCC_PWR_CLK_ENABLE();
    HAL_PWREx_EnableUltraLowPower();
    HAL_PWREx_EnableFastWakeUp();
    __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_MSI);
 
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOH_CLK_ENABLE();
 
    GPIO_InitStructure.Pin = GPIO_PIN_All;
    GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStructure.Pull = GPIO_NOPULL;
 
    HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); 
    HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
    HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
    HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);
 
    __HAL_RCC_GPIOA_CLK_DISABLE();
    __HAL_RCC_GPIOB_CLK_DISABLE();
    __HAL_RCC_GPIOC_CLK_DISABLE();
    __HAL_RCC_GPIOH_CLK_DISABLE();
}
 
static void RTC_Config(void)
{
  RTCHandle.Instance = RTC;
 
  RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
  RTCHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
  RTCHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
  RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
  RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
  if(HAL_RTC_Init(&RTCHandle) != HAL_OK)
 {
    Error_Handler(); 
  }
}
 
void MX_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;
 
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOH_CLK_ENABLE();
 
    GPIOA->MODER = 0xFFFFFFFF;
    GPIOB->MODER = 0xFFFFFFFF;
    GPIOC->MODER = 0xFFFFFFFF;
    GPIOH->MODER = 0xFFFFFFFF;
 
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1, GPIO_PIN_RESET);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4|GPIO_PIN_5, GPIO_PIN_SET);
 
    GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_4|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
    GPIO_InitStruct.Pull = GPIO_PULLDOWN;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    __HAL_RCC_GPIOB_CLK_DISABLE();
    __HAL_RCC_GPIOC_CLK_DISABLE();
    __HAL_RCC_GPIOH_CLK_DISABLE();
    HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);
}
 
 void MX_DMA_Init(void) 
{
  __HAL_RCC_DMA1_CLK_ENABLE();
  HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
}
 
void MX_LPUART1_UART_Init(void)
{
    hlpuart1.Instance = LPUART1;
    hlpuart1.Init.BaudRate = 115200;
    hlpuart1.Init.WordLength = UART_WORDLENGTH_8B;
    hlpuart1.Init.StopBits = UART_STOPBITS_1;
    hlpuart1.Init.Parity = UART_PARITY_NONE;
    hlpuart1.Init.Mode = UART_MODE_TX_RX;
    hlpuart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    hlpuart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
    hlpuart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
    if (HAL_UART_Init(&hlpuart1) != HAL_OK)
    {
        _Error_Handler(__FILE__, __LINE__);
    }
}
 
 void MX_USART2_UART_Init(void)
{
    huart2.Instance = USART2;
    huart2.Init.BaudRate = 115200;
    huart2.Init.WordLength = UART_WORDLENGTH_8B;
    huart2.Init.StopBits = UART_STOPBITS_1;
    huart2.Init.Parity = UART_PARITY_NONE;
    huart2.Init.Mode = UART_MODE_TX_RX;
    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
    huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
    huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
    if (HAL_UART_Init(&huart2) != HAL_OK)
    {
        _Error_Handler(__FILE__, __LINE__);
    }
}
void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  if(huart->Instance==LPUART1)
  {
    __HAL_RCC_LPUART1_CLK_ENABLE();
 
    GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF6_LPUART1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    hdma_lpuart1_rx.Instance = DMA1_Channel3;
    hdma_lpuart1_rx.Init.Request = DMA_REQUEST_5;
    hdma_lpuart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_lpuart1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_lpuart1_rx.Init.MemInc = DMA_MINC_ENABLE;
    hdma_lpuart1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_lpuart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    hdma_lpuart1_rx.Init.Mode = DMA_NORMAL;
    hdma_lpuart1_rx.Init.Priority = DMA_PRIORITY_LOW;
    if (HAL_DMA_Init(&hdma_lpuart1_rx) != HAL_OK)
    {
      _Error_Handler(__FILE__, __LINE__);
    }
    __HAL_LINKDMA(huart,hdmarx,hdma_lpuart1_rx);
    HAL_NVIC_SetPriority(AES_RNG_LPUART1_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(AES_RNG_LPUART1_IRQn);
  }
  else if(huart->Instance==USART2)
  {
    __HAL_RCC_USART2_CLK_ENABLE();
    GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(USART2_IRQn);
  }
}
 
void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
{
  if(huart->Instance==LPUART1)
  {
    __HAL_RCC_LPUART1_CLK_DISABLE();
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_2|GPIO_PIN_3);
    HAL_DMA_DeInit(huart->hdmarx);
    HAL_NVIC_DisableIRQ(AES_RNG_LPUART1_IRQn);
  }
  else if(huart->Instance==USART2)
  {
    __HAL_RCC_USART2_CLK_DISABLE();
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);
    HAL_NVIC_DisableIRQ(USART2_IRQn);
  }
}
 
void EnableUartIT(void)//′??ú3?ê??ˉ
{
    __HAL_UART_ENABLE_IT(&hlpuart1, UART_IT_IDLE);
    __HAL_UART_CLEAR_IDLEFLAG(&hlpuart1);    HAL_UART_Receive_DMA(&hlpuart1,LPUart1type.LPUart1DMARecBuff,LPUART1_DMA_REC_SIZE); 
    __HAL_UART_ENABLE_IT(&huart2, UART_IT_RXNE);
    HAL_UART_Receive_IT(&huart2, &Usart2Rx, 1); 
}

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1 REPLY 1
Mohamed Aymen HZAMI
ST Employee

‎2019-01-09 07:32 AM

Hello,

In your configuration, after initializing both UARTs, you put all the GPIOs in analog mode, in this case, the UART pins are no longer configured.

You need to change the SystemPower_Config function like this :

static void SystemPower_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
 
  __HAL_RCC_PWR_CLK_ENABLE();
  HAL_PWREx_EnableUltraLowPower();
  HAL_PWREx_EnableFastWakeUp();
  __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_MSI);
 
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
 
  GPIO_InitStructure.Pin = GPIO_PIN_All;
  GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStructure.Pull = GPIO_NOPULL;
 
  HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
	HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
  HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);
	
/* Retain the state of USART2, LPUART1 and EXTI PINs */
	GPIO_InitStructure.Pin = GPIO_PIN_All & (~GPIO_PIN_2) & (~GPIO_PIN_3) & (~GPIO_PIN_9) & (~GPIO_PIN_10) & (~GPIO_PIN_6) & (~GPIO_PIN_7);
	HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); 
 
  __HAL_RCC_GPIOA_CLK_DISABLE();
  __HAL_RCC_GPIOB_CLK_DISABLE();
  __HAL_RCC_GPIOC_CLK_DISABLE();
  __HAL_RCC_GPIOD_CLK_DISABLE();
  __HAL_RCC_GPIOH_CLK_DISABLE();
}

In this way, you make sure that the USART pins are still in their state.

Best Regards,

Mohamed Aymen.

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