[quote]In any case, DMA has the advantage that it runs even when an interrupt handler is currently executing. So even in the worst case, you have increased the buffer size from one byte (RXBUF) to multiple bytes.[/quote] At least in theory. Actually, DMA must share the AHB with other masters. One needs to read the datasheet carefully for possible bus contentions. Unfortunately my knowledge of the MSP432 is rather limited, but I know this issue from other Cortex M devices. A FIFO doesn't need to share any bus until it is full - but it seems the MSP432 USCI/UART doesn't have one (in difference to the TM4C) ...
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