CCS/EK-TM4C123GXL: PF0 not working as PWM output

Sheldon Maciel

Tool/software: Code Composer Studio

Hello,

I have been testing the functionality of all of the PWM enabled pins on the Tiva C Series tm4c123g, and got 15 out of the 16 rated PWM pins to work. I could not seem to get PF0 to work with PWM output. I have all of the other PWM pins outputting perfectly fine at the same time, but PF0 does not wat to work.

I used the PWM signals table as a reference which is attached.

Please let me know if you have any ideas or suggestions.

Thanks,

Sheldon

over 9 years ago

0 Sheldon Maciel over 9 years ago

Intellectual 400 points

If you need the code I am using, I will upload that as well. Thanks!

0 Petrei over 9 years ago in reply to Sheldon Maciel

Guru 26105 points

Hi,

PF0 starts up as NMI pin. To use it for other puposes, you need to unlock it first and re-configure as you need.

Search the forum, many users had this problem.

0 Sheldon Maciel over 9 years ago in reply to Petrei

Intellectual 400 points

Thank you, Petrei! I will search the other forums for that issue. Have a great day!

0 Charles Tsai over 9 years ago in reply to Sheldon Maciel

TI__Guru**** 191886 points

Petrei, thanks for providing the tips.

Sheldon, please also find issue#1 in this post e2e.ti.com/.../374640 that lists what pins must be first unlocked before using alternate functions.

0 Sheldon Maciel over 9 years ago in reply to Charles Tsai

Intellectual 400 points

Thanks Charles for the extra information!

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CCS/EK-TM4C123GXL: PF0 not working as PWM output