Question
STM32H7 UART DMA idle interrupt
hello
when i use UART Idle interupt with DMA on STM32H743XIH6 chip,i found ,the interupt function will run imediatly when HAL_UARTEx_ReceiveToIdle_DMA(&huart2, (uint8_t *)Uart2RxBuffer, 50)run,and this is my core code
MPU_Config();
// SCB_EnableICache();
// SCB_EnableDCache();
HAL_Init();
SystemClock_Config();
PeriphCommonClock_Config();
delay_init();
__HAL_RCC_BKPRAM_CLK_ENABLE();
HAL_PWR_EnableBkUpAccess();
MX_GPIO_Init();
User_GPIO_Init();
MX_DMA_Init();
MX_USART2_UART_Init();
HAL_UARTEx_ReceiveToIdle_DMA(&huart2, (uint8_t *)Uart2RxBuffer, 50);
///////////////////////////////////////////////////////////////////////////
UART_HandleTypeDef huart2;
DMA_HandleTypeDef hdma_usart2_rx;
/* USART2 init function */
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.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler(__LINE__,__FILE__);
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart2, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler(__LINE__,__FILE__);
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart2, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler(__LINE__,__FILE__);
}
if (HAL_UARTEx_DisableFifoMode(&huart2) != HAL_OK)
{
Error_Handler(__LINE__,__FILE__);
}
/* USER CODE BEGIN USART2_Init 2 */
/* USER CODE END USART2_Init 2 */
}
void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
if(uartHandle->Instance==USART2)
{
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USART2;
PeriphClkInitStruct.Usart234578ClockSelection = RCC_USART234578CLKSOURCE_D2PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
Error_Handler(__LINE__,__FILE__);
}
/* USART2 clock enable */
__HAL_RCC_USART2_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
/**USART2 GPIO Configuration
PD5 ------> USART2_TX
PD6 ------> USART2_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
/* USART2 DMA Init */
/* USART2_RX Init */
hdma_usart2_rx.Instance = DMA1_Stream6;
hdma_usart2_rx.Init.Request = DMA_REQUEST_USART2_RX;
hdma_usart2_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart2_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart2_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart2_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart2_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart2_rx.Init.Mode = DMA_CIRCULAR;
hdma_usart2_rx.Init.Priority = DMA_PRIORITY_LOW;
hdma_usart2_rx.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_usart2_rx) != HAL_OK)
{
Error_Handler(__LINE__,__FILE__);
}
__HAL_LINKDMA(uartHandle,hdmarx,hdma_usart2_rx);
HAL_NVIC_SetPriority(USART2_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(USART2_IRQn);
}
}
void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
{
if(uartHandle->Instance==USART2)
{
__HAL_RCC_USART2_CLK_DISABLE();
/**USART2 GPIO Configuration
PD5 ------> USART2_TX
PD6 ------> USART2_RX
*/
HAL_GPIO_DeInit(GPIOD, GPIO_PIN_5|GPIO_PIN_6);
HAL_DMA_DeInit(uartHandle->hdmarx);
HAL_NVIC_DisableIRQ(USART2_IRQn);
}
}
extern volatile uint8_t Uart2RxBuffer[50];
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
if(huart->Instance==USART2)
{
if(HAL_UART_RXEVENT_IDLE == HAL_UARTEx_GetRxEventType(huart))
{
printf("HAL_UART2_RXEVENT_IDLE:\r\n");
}
printf("HAL_UART2Ex_RxEventCallback:\r\n");
for(uint8_t i=0;i<50;i++)
{
printf("%c",Uart2RxBuffer[i]);
}
printf("(%d)\r\n",Size);
}
}
when power on or reset,the code that
HAL_UART2_RXEVENT_IDLE:
HAL_UART2Ex_RxEventCallback:
(50)
happen,and then i send "123456789"many times,it runs normal,why chip power on or reset it interupt imediatly,and size equals to HAL_UARTEx_ReceiveToIdle_DMA config size
Edited to apply source code formatting - please see How to insert source code for future reference.