HAL_UART_Transmit与HAL_UART_Transmit_IT()的区别

baiye2019

在写串口的时候发现了两个发射函数HAL_UART_Transmit()和HAL_UART_Transmit_IT()，在工程中注释的解释如下：
(#) There are two mode of transfer:
       (+) Blocking mode: The communication is performed in polling mode.
           The HAL status of all data processing is returned by the same function
           after finishing transfer.
       (+) Non-Blocking mode: The communication is performed using Interrupts
           or DMA, These API's return the HAL status.
           The end of the data processing will be indicated through the
           dedicated UART IRQ when using Interrupt mode or the DMA IRQ when
           using DMA mode.
           The HAL_UART_TxCpltCallback(), HAL_UART_RxCpltCallback() user callbacks
           will be executed respectively at the end of the transmit or Receive process
           The HAL_UART_ErrorCallback()user callback will be executed when a communication error is detected

    (#) Blocking mode API's are :
        (+) HAL_UART_Transmit()
        (+) HAL_UART_Receive()

    (#) Non-Blocking mode API's with Interrupt are :
        (+) HAL_UART_Transmit_IT()
        (+) HAL_UART_Receive_IT()
        (+) HAL_UART_IRQHandler()


但是看得不是很明白（好像是中断和DMA和中断用IT的，其他的用没有IT的）希望大神能解释一下，这两个函数的具体区别。这两个函数分别具体在什么情况下用。

glenxu

你理解是对的！
一个用于查询方式，一个是中断方式（含DMA中断）

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c781918946

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