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TM4C1294KCPDT: There is no data on the serial port on the microcontroller

Mayra Martinez
Prodigy 160 points
Part Number: TM4C1294KCPDT
Other Parts Discussed in Thread: EK-TM4C1294XL
Hello

I have a question, I have a microcontroller soldered to a PCB, I programmed it with a TIVA TM4C129, 
when disconnecting the PCB from the power and reconnecting it, 
the TX signal of the UART0 of the microcontroller on the PCB is in a high state, but not I see data 
transmitted on an oscilloscope. There is only data on the TX pin if I reprogram the PCB and keep it connected. 
I cannot be programming the PCB every time I need to transmit data via UART. Could you give me an idea why 
there is no data after disconnecting the PCB from the power?


Mayra
  • 0
    TI__Guru**** 191026 points

    Hi,

      Normally, when you load a new firmware, the debugger will run code the device boot code and halt at main().

      Can you try your code on a LaunchPad? Do you see the same problem?

      Can you try the C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl\uart_echo example? Do you see the same problem on either the LaunchPad or your custom board? What is the result?

      Can you show your code and also compare with the example code?

      

  • 0 in reply to Charles Tsai
    TI__Guru**** 191026 points

    Hi Mayra,

      I have not heard back from you. I hope your problem is resolved. I will close the thread for now. If you have any update, you can write back to the post and the thread will automatically reopen to Open status.