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各位大牛，我在使用HAL库 空闲中断接收不定长数据，然后将接收到的数据再发送到电脑，第一帧数据一定会丢失，后面就正常了。有谁遇到过这样的问题的吗？
void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(uartHandle->Instance==USART1)
{
/* USER CODE BEGIN USART1_MspInit 0 */
/* USER CODE END USART1_MspInit 0 */
/* USART1 clock enable */
__HAL_RCC_USART1_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/**USART1 GPIO Configuration
PA9 ------> USART1_TX
PA10 ------> USART1_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USART1 DMA Init */
/* USART1_RX Init */
hdma_usart1_rx.Instance = DMA1_Channel5;
hdma_usart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_usart1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart1_rx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart1_rx.Init.Mode = DMA_NORMAL;
hdma_usart1_rx.Init.Priority = DMA_PRIORITY_HIGH;
if (HAL_DMA_Init(&hdma_usart1_rx) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(uartHandle,hdmarx,hdma_usart1_rx);
/* USART1_TX Init */
hdma_usart1_tx.Instance = DMA1_Channel4;
hdma_usart1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_usart1_tx.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_usart1_tx.Init.MemInc = DMA_MINC_ENABLE;
hdma_usart1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_usart1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_usart1_tx.Init.Mode = DMA_NORMAL;
hdma_usart1_tx.Init.Priority = DMA_PRIORITY_HIGH;
if (HAL_DMA_Init(&hdma_usart1_tx) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(uartHandle,hdmatx,hdma_usart1_tx);
/* USART1 interrupt Init */
HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART1_IRQn);
HAL_UART_Receive_DMA(uartHandle,recieve,64); //½óêÕ3õê¼»ˉ
HAL_UART_Transmit_DMA(uartHandle,send,64); //·￠Ëí3õê¼»ˉ
__HAL_UART_ENABLE_IT(uartHandle,UART_IT_IDLE);
__HAL_UART_CLEAR_IDLEFLAG(&huart1);
/* USER CODE END USART1_MspInit 1 */
}
}
if(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE)==SET)
{
__HAL_UART_CLEAR_IDLEFLAG(&huart1);
//__HAL_UART_CLEAR_PEFLAG(&huart1);
temp = huart1.Instance->DR;
temp = huart1.Instance->SR;
temp = temp;
len = 0;
HAL_UART_DMAStop(&huart1);
temp=__HAL_DMA_GET_COUNTER(&hdma_usart1_rx);
len = 64 - temp;
HAL_UART_Receive_DMA(&huart1,recieve,64); //½óêÕ3õê¼»ˉ
memcpy(send,recieve,len);
rx_flag =1 ;
}
while (1)
{
if(rx_flag == 1)
{
HAL_UART_Transmit_DMA(&huart1,send,len);
rx_flag=0;
}
}
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发表于 2020-12-4 10:33:38
楼主
发表于 2020-12-4 11:10:27
