HAL_DMA_Start_IT(&hdma, (uint32_t)&GPIOA->IDR, (uint32_t)&data_array[i], 1);是什么意思,中文解释
时间: 2024-05-20 13:16:36 浏览: 15
uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)
This function is used to start a direct memory access (DMA) transfer with interrupt (IT) enabled. It takes three parameters: the source address, the destination address, and the length of the data to be transferred. Once called, the DMA controller will transfer data from the source address to the destination address for the given length, and generate an interrupt when the transfer is complete. This function is typically used in conjunction with the HAL_DMA_IRQHandler() function, which handles the interrupt and allows the application to perform any necessary post-transfer processing.
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HAL_DMA_Start_IT(&hdma, (uint32_t)&GPIOA->IDR, (uint32_t)&data_array[i], 1);什么意思
void HAL_DMA_Start_IT(
DMA_HandleTypeDef *hdma,
uint32_t SrcAddress,
uint32_t DstAddress,
uint32_t DataLength
);
This function starts a DMA transfer with interrupt enabled. The source address, destination address, and data length are passed as parameters, along with a pointer to the DMA handle. The DMA transfer will transfer DataLength bytes from the source to the destination address. Once the transfer is complete, an interrupt will be generated and the corresponding function in the DMA handle will be called.
__HAL_DMA_GET_FLAG(&hdma_usart2_rx
__HAL_DMA_GET_FLAG(&hdma_usart2_rx, DMA_FLAG_TC4)是一个用于获取DMA传输完成标志的宏定义。其中,hdma_usart2_rx是一个DMA句柄,DMA_FLAG_TC4是一个传输完成标志。该宏定义会返回一个非零值,表示传输已经完成。下面是一个使用__HAL_DMA_GET_FLAG()宏定义的例子:
```c
if(__HAL_DMA_GET_FLAG(&hdma_usart2_rx, DMA_FLAG_TC4))
{
// DMA传输已经完成
}
```