Hi Sumit, Are you wanting to use FIFO mode or nonFIFO mode? With nonFIFO mode, you have to start your transmissions by writing to TX buffer first. With FIFO mode, you don't need to do this because interrupts will be triggered automatically based on the amount of space available in the TXFIFO to be written to. You will need to decide whether or not you are trying to operate in FIFO vs. nonFIFO mode as this will affect my response/suggestions accordingly. Best Regards, Allison
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