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Receiving variable-length UART messages

Messages of unknown length arrive over UART at 921600 baud. You use DMA into a buffer. How do you know a message has ended?

A.Wait for the DMA transfer-complete interrupt and nothing elseB.Poll the RX pin in the main loop until it has read low twiceC.Start a 1-second software timer after each byte that arrivesD.Use the UART idle-line interrupt, which fires when the line goes quiet

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Receiving variable-length UART messages

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