An ACK signal would be visible with the oscilloscope/logic analyzer, which is vital for debugging communication (I2C, UART, SPI, etc.) issues. Printing serial data will not do you much good here, you need to access a debugger using some form of FET tool. Extracting and pasting driverlib only makes your code more confusing. UCTXIFG staying set means that new data is never ready to be written into UCAxTXBUF, most likely because the slave is not returning an ACK. You can view the UCNACKIFG bit to see if this is the case. Regards, Ryan
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