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Pleae understand that DMA completed does not means UART has completely send the data since DMA just move the data to the UART buffer. Then, it will take time for UART to shift the data out to the TX pin.
Generally, TI chip will go to sleep when no task is waiting. So, you may try to add a delay after DMA completed. Or, put the chip in PWRMGR_ALWAYS_ON or disable the POWER_SAVING mode for testing purpuse.
