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STM32 UART DMA Circular Buffer ReceiveToIdle

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Запись принятых по UART данных в Circular Buffer (круговой буфер) с использованием DMA (процессор не тратит свое время на заполнение массива с принятыми данными).
Запускаем HAL_UARTEx_ReceiveToIdle_DMA
Прерывания по Idle HAL_UARTEx_RxEventCallback

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...
/* USER CODE BEGIN 0 */
#define UART1RxBufferLength 26
 
uint8_t UART1_RecieveBuffer[UART1RxBufferLength];
uint8_t UART2_TransmitBuffer[100];
 
uint8_t t_MakeUARTTransmit = 0;
 
volatile uint16_t t_UART_Errors_C = 0;
volatile uint32_t t_UARTRecieveCNT = 0;
volatile uint16_t t_CurrentUART1RxBufferPosition = 0;
 
void ResetUART1RxBuffer(void)
{
	uint16_t i = 0;
	while (i < UART1RxBufferLength)
	{
		UART1_RecieveBuffer[i] = 0;
		i++;
	}
}
 
void StartUART1RecieveToIdleDMA(void)
{
	ResetUART1RxBuffer();
	HAL_UARTEx_ReceiveToIdle_DMA(&huart1, UART1_RecieveBuffer, UART1RxBufferLength);
}
 
void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)
{
	if (huart->Instance == USART1)
	{
		StartUART1RecieveToIdleDMA();
		t_UART_Errors_C++;
	}
}
 
void  HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
	t_UARTRecieveCNT++;
	t_CurrentUART1RxBufferPosition = Size;
	//t_UARTRecievedDataSize = Size;
 
	HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_4);
 
}
/* USER CODE END 0 */
...
/* USER CODE BEGIN WHILE */
  StartUART1RecieveToIdleDMA();
  uint8_t TransferLength = 0;
  while (1)
  {
    if (t_MakeUARTTransmit == 1)
	{
		TransferLength = sprintf((char*)UART2_TransmitBuffer, "1234567890");
		HAL_UART_Transmit(&huart2, UART2_TransmitBuffer, TransferLength, 100);
		HAL_Delay(1);
		HAL_UART_Transmit(&huart2, UART2_TransmitBuffer, TransferLength, 100);
		HAL_UART_Transmit(&huart2, UART2_TransmitBuffer, TransferLength, 100);
 
		t_MakeUARTTransmit = 0;
	}
    /* USER CODE END WHILE */



Разбор данных UART из Circular Buffer (пример)


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...
/* USER CODE BEGIN 0 */
#define UART1RxBufferLength 24
 
uint8_t UART1_RecieveBuffer[UART1RxBufferLength];
uint8_t UART2_TransmitBuffer[100];
 
uint8_t t_MakeUARTTransmit = 0;
 
volatile uint16_t t_UART_Errors_C = 0;
volatile uint32_t t_UARTRecieveCNT = 0;
volatile uint16_t t_CurrentUART1RxBufferPosition = 0;
 
volatile uint16_t t_CurrentProcessedBufferPosition = 0;
 
volatile uint8_t t_CanMakeUARTBufferProcessing = 0;
volatile uint32_t t_UART1RecievedAt = 0;
 
uint8_t t_UARTExtractedData[10];
 
void ResetUART1RxBuffer(void)
{
	uint16_t i = 0;
	while (i < UART1RxBufferLength)
	{
		UART1_RecieveBuffer[i] = 0;
		i++;
	}
}
 
void ResetUARTExtractedDataBuffer(void)
{
	uint16_t i = 0;
	while (i < 10)
	{
		t_UARTExtractedData[i] = 0;
		i++;
	}
}
 
void StartUART1RecieveToIdleDMA(void)
{
	ResetUART1RxBuffer();
	HAL_UARTEx_ReceiveToIdle_DMA(&huart1, UART1_RecieveBuffer, UART1RxBufferLength);
}
 
void HAL_UART_ErrorCallback(UART_HandleTypeDef *husart)
{
	if (husart->Instance == USART1)
	{
		StartUART1RecieveToIdleDMA();
		t_UART_Errors_C++;
	}
}
 
void  HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *husart, uint16_t Size)
{
	t_UARTRecieveCNT++;
	t_CurrentUART1RxBufferPosition = Size;
	t_UART1RecievedAt = HAL_GetTick();
	t_CanMakeUARTBufferProcessing = 1;
}
 
uint8_t t_Value = 0;
uint16_t t_LengthToProcess = 0;
 
void ProcessUARTBuffer(void)
{
	uint16_t i = t_CurrentProcessedBufferPosition;
	uint16_t k = 0;
	uint16_t LengthToProcess = 0;
	uint16_t Processed_C = 0;
	uint8_t Started = 0;
	uint16_t CurrentUART1RxBufferPosition = t_CurrentUART1RxBufferPosition;
 
	ResetUARTExtractedDataBuffer();
 
	if (CurrentUART1RxBufferPosition >= t_CurrentProcessedBufferPosition)
	{
		LengthToProcess = CurrentUART1RxBufferPosition - t_CurrentProcessedBufferPosition;
	} else
	{
		if (t_CurrentProcessedBufferPosition > CurrentUART1RxBufferPosition)
		{
			LengthToProcess = (int)UART1RxBufferLength - t_CurrentProcessedBufferPosition + CurrentUART1RxBufferPosition;
		}
	}
 
	t_LengthToProcess = LengthToProcess;
	//HAL_Delay(2000);
 
	while (Processed_C < LengthToProcess)
	{
		if (Started == 1)
		{
			if (UART1_RecieveBuffer[i] == '_')
			{
				t_CurrentProcessedBufferPosition = i+1;
				if (t_CurrentProcessedBufferPosition >= UART1RxBufferLength)
				{
					t_CurrentProcessedBufferPosition = 0;
				}
				break;
			}
			t_UARTExtractedData[k] = UART1_RecieveBuffer[i];
			k++;
		}
 
		if (UART1_RecieveBuffer[i] == '$')
		{
			if (Started == 0)
			{
				Started = 1;
			} else
			{
				ResetUARTExtractedDataBuffer();
				break;
			}
		};
 
		LengthToProcess++;
		i++;
		if (i == UART1RxBufferLength)
		{
			i = 0;
		}
	}
}
/* USER CODE END 0 */
...
/* USER CODE BEGIN WHILE */
  StartUART1RecieveToIdleDMA();
  uint8_t TransferLength = 0;
  while (1)
  {
    if (t_MakeUARTTransmit == 1)
	{
		TransferLength = sprintf((char*)UART2_TransmitBuffer, "$1234567_");
		HAL_UART_Transmit(&huart2, UART2_TransmitBuffer, TransferLength, 100);
 
		t_MakeUARTTransmit = 0;
	}
 
    if (t_MakeUARTTransmit == 2)
	{
		TransferLength = sprintf((char*)UART2_TransmitBuffer, "$ABC_");
		HAL_UART_Transmit(&huart2, UART2_TransmitBuffer, TransferLength, 100);
 
		t_MakeUARTTransmit = 0;
	}
 
    /*if (t_CanMakeUARTBufferProcessing == 1)
    {
    	t_CanMakeUARTBufferProcessing = 0;
    	ProcessUARTBuffer();
    }*/
    if ((t_UART1RecievedAt > 0) && (HAL_GetTick() > (t_UART1RecievedAt + 10)))
    {
    	ProcessUARTBuffer();
    	t_UART1RecievedAt = 0;
    }
    /* USER CODE END WHILE */
...



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