测试效果是两次HAL_UART_RECEPTION_TOIDLE
实际上空闲中断标志也会置位的,只是DMA传输完成中断回调里面将空闲中断关闭了,所以DMA传输完毕后,没有再进一步触发空闲。
[C] 纯文本查看 复制代码 /**
* @brief DMA UART receive process complete callback.
* @param hdma DMA handle.
* @retval None
*/
static void UART_DMAReceiveCplt(DMA_HandleTypeDef *hdma)
{
UART_HandleTypeDef *huart = (UART_HandleTypeDef *)(hdma->Parent);
/* DMA Normal mode */
if (hdma->Init.Mode != DMA_CIRCULAR)
{
huart->RxXferCount = 0U;
/* Disable PE and ERR (Frame error, noise error, overrun error) interrupts */
CLEAR_BIT(huart->Instance->CR1, USART_CR1_PEIE);
CLEAR_BIT(huart->Instance->CR3, USART_CR3_EIE);
/* Disable the DMA transfer for the receiver request by resetting the DMAR bit
in the UART CR3 register */
CLEAR_BIT(huart->Instance->CR3, USART_CR3_DMAR);
/* At end of Rx process, restore huart->RxState to Ready */
huart->RxState = HAL_UART_STATE_READY;
/* If Reception till IDLE event has been selected, Disable IDLE Interrupt */
if (huart->ReceptionType == HAL_UART_RECEPTION_TOIDLE)
{
CLEAR_BIT(huart->Instance->CR1, USART_CR1_IDLEIE);
}
}
/* Check current reception Mode :
If Reception till IDLE event has been selected : use Rx Event callback */
if (huart->ReceptionType == HAL_UART_RECEPTION_TOIDLE)
{
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/*Call registered Rx Event callback*/
huart->RxEventCallback(huart, huart->RxXferSize);
#else
/*Call legacy weak Rx Event callback*/
HAL_UARTEx_RxEventCallback(huart, huart->RxXferSize);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
}
else
{
/* In other cases : use Rx Complete callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/*Call registered Rx complete callback*/
huart->RxCpltCallback(huart);
#else
/*Call legacy weak Rx complete callback*/
HAL_UART_RxCpltCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
}
}
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