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TMS320C6748: UART pin not transmitting

AAAA PPPP
Expert 1410 points
Part Number: TMS320C6748

Hello,

I am using c6748 LCDK kit. I have succesfully tried UART2 starterware code. Now I want to transmit from UART1 of LCDK kit. The UART interrupts,enter ISR execute UARTputnonblocking() function for UART1register base address, but there is no variation in j15 pin19 UART1 TX in oscilloscope. Why do this happen ? Should I set anything like header or jumper in board? Please help.

Thanks in advance

Shalini K

  • 0
    Guru 26430 points
    You need to enable the clock and mux'ed in the correct pins for UART1. Also, on the LCDK, UART1 lines are shared with the AES850 fingerprint chip. Only the first versiions for the LCDK have the chip. Later versions doe not have the chip installed. The schematic would suugest that even though the chip is not installed, the UART1 lines are not connected either. Check that R205 and R208 are notpopulated. R206 and R209 will need to be populated. Or probe at R206 for TXD.
  • 0 in reply to Norman Wong
    Expert 1410 points
    Thank you sir...R206 and R209 were not populated...