I do not see problems in your UART code. However, you do not fill RX callback function. I do not know if this will cause your problem but you can fill it and have another test. If your UART is correctly configured, the TX(P1_6) should be "1" (high status). Do you want to disconnect P1_6 from PA0 and use scope to have a look? Check the TX status, is it high or low to make sure your SW and HW are no problem first.
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