stm32f4 串口DMA,空闲中断接收数据，单步调试成功，全速运...

wangjinkui 提问时间：2017-10-30 22:24 /

本帖最后由 wangjinkui 于 2017-10-30 22:29 编辑

stm32F4 使用串口DMA，空闲中断接收不定长的数据，单步调试的时候没有问题，全速运行时就出错了，出错的原因是进入中断后只收到几个数据，我想是不是时序的问题，改不过来了，请问有没有了解这是什么情况的能不能给一下指导，谢谢。相关代码如下：
主函数：

HAL_UART_Transmit(&huart2,HG1134_stop,6, 0xFFFF); //
// HAL_UART_Transmit(&huart6,HG1134_stop,6, 0xFFFF); //
__HAL_UART_DISABLE_IT(&huart3, UART_IT_IDLE); //
__HAL_UART_ENABLE_IT(&huart2, UART_IT_IDLE); //
HAL_UART_Receive_DMA(&huart2, Usart2Type.usartDMA_rxBuf, RECEIVELEN); //
while(Eph_ready == 0)
{
HAL_UART_Transmit(&huart2,HG1134_stop,6, 0xFFFF); //
HAL_Delay(1);
HAL_UART_Transmit(&huart2,HG1134_ephout,8, 0xFFFF); //
HAL_UART_Transmit(&huart6,HG1134_ephout,8, 0xFFFF); //
HAL_Delay(300);
huart2.hdmarx->State = HAL_DMA_STATE_READY;
HAL_UART_Receive_DMA(&huart2,Usart2Type.usartDMA_rxBuf,RECEIVELEN);
}
__HAL_UART_DISABLE_IT(&huart2, UART_IT_IDLE); //
HAL_UART_DMAStop(&huart2); //
HAL_UART_Transmit(&huart3,HG1134_close,7, 0xFFFF); //
__HAL_UART_ENABLE_IT(&huart3, UART_IT_IDLE); //
HAL_UART_Receive_DMA(&huart3, Usart3Type.usartDMA_rxBuf, RECEIVELEN);

复制代码

中断函数

：

void Usart2Receive_IDLE(UART_HandleTypeDef *huart)
{
uint32_t temp;
if((__HAL_UART_GET_FLAG(huart,UART_FLAG_IDLE) != RESET))
{
__HAL_UART_CLEAR_IDLEFLAG(huart);
HAL_UART_DMAStop(huart);
temp = __HAL_DMA_GET_COUNTER(huart->hdmarx);
Usart2Type.rx_len = RECEIVELEN - temp;
if(Usart2Type.usartDMA_rxBuf[0] == 0x90&&Usart2Type.usartDMA_rxBuf[1] ==0xEB&&Usart2Type.usartDMA_rxBuf[4] ==0x45)
{
Eph_ready = 1;
Eph_len = Usart2Type.rx_len;
memcpy(Eph_buf,Usart2Type.usartDMA_rxBuf,Usart2Type.rx_len);
}
}
}