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TM4C123GH6PM: Possible conflict between UART3 and M1PWM2

Part Number: TM4C123GH6PM

I'm checking if there is any known conflicts between UART3 and M1PWM2.

Configure UART3 and output data on the TX pin. Scope confirms output.

Then configure M1PWM2 to generate a  ~300kHz 50% signal, no interrupts, just the output signal. Scope confirms output.

However, now no signal is output on UART3 TX.

UART3 is on GPIOC. M1PWM2 is on GPIOA, PA6. Don't see how they can interact.

Is there something I don't understand?

  • I've checked your pin listings - find those (just) as you've stated.      Agreed - I see no reason for any interaction.

    Note too that all of your chosen pins are brought out upon the 4C123 LPad - enabling others to test/confirm.

    May we see your "focused code" - which configures both UART3 and M1PWM2?       Just as you conclude - any "interaction" is beyond my recognition...

  • Hi Keith,
    Like cb1 said, there is no interaction between these two. We can take a look if you paste your code.