In circular mode, it is essential to choose the buffer size large enough to capture all possible data reception. But in the case of variable length reception situation, idle line interrupt comes into play. ![]() After the reception of given sized character, UART will rise a Transfer Complete interrupt. Normally, when we use UART with DMA method, we need to know the size of the transmission. This duration is inversely proportional with the baud rate. UART has a useful interrupt handler, called idle line detection, which is triggered if receive line is inactive 1 character frame. ![]() This example is implemented for STM32 microprocessors but can easily be adapted other MCUs. In this article, you will find the usage of UART with DMA mode.
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