• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 31 subscribers
  • Views 237 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TM4C1294KCPDT: GPIO PM port pin issue

Cherry Zhou
Mastermind 22235 points

Part Number: TM4C1294KCPDT

Hi team,

Here's an issue may need your help:

Issue: now PM0, PMI in parallel, PM2, PM3 in parallel, PM4, PM5 in parallel, PM6, PM7 in parallel, as CCP input to Timer (one measured rising edge, one measured falling edge), input square wave signal on PM0.1, it's found that PM2.3  also have similar square wave signal (large amplitude), PM4.5 PM6.7 too with small amplitude. Input the square wave on PM4.5, and the same square wave signal is found on PM6.7, PM0.1, PM2.3 also has very small square wave signals.

So the customer would like to know if the PM0, 1, 2, 3 Pin internal and PM4, 5, 6, 7 pin internal has some correlation? Could you help check this case? Thanks.

Best Regards,

Cherry

  • +1
    TI__Guru**** 191886 points

    Hi Cherry,

    Cherry Zhou said:
    input square wave signal on PM0.1, it's found that PM2.3  also have similar square wave signal (large amplitude), PM4.5 PM6.7 too with small amplitude.
    Cherry Zhou said:
    So the customer would like to know if the PM0, 1, 2, 3 Pin internal and PM4, 5, 6, 7 pin internal has some correlation?

    Each pin is independent of each other and each timer module is independent of each other too. Signal on PM0 for PM1 for Timer2 should not interfere with any other timer modules that receives signals on timer 3, 4 and 5. Please double check if you have correct pin muxing configuration. Is this a problem you only see on the custom board? Can you replicate on the LaunchPad? Please also double check if there is any crosstalk between signals on the custom board. 

     I'm still on vacation and please expect delay in response. I will be back on 1/4/2022.