CPU Timer with ePWM

Kyle Crockett

Hello, I am currently trying to run ePWM 1,2 and 3 on a F28027 while using CPU Timer interrupts 0 and 2. With the ePWM dissabled I am able to catch both timer interrupts. When the ePWM is enabled I am only able to get the CPU Timer 0 interrupt to work.

The PWM are on Group 3 PIE and the CPU Timers are on Group 1.

I dont understand why the ePWM would be interfering with the timer interrupts.

Any guidance would be greatly appreciated.

over 12 years ago

0 Gautam Iyer over 12 years ago

Guru 192875 points

Hi Kyle,

Check this out:

http://processors.wiki.ti.com/index.php/Interrupt_Nesting_on_C28x

Regards,

Gautam

0 Igor Gorbachev over 12 years ago

Guru 20525 points

Hi,

perhaps this thread will be useful also

http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/315412.aspx

Regards,

Igor

0 Kyle Crockett over 12 years ago in reply to Igor Gorbachev

Prodigy 210 points

So, the nesting only seems to work for PIE groups 1-12. Timer 0 is in PIE group 1 and PWM is on PIE group 3, however Timer 1 and Timer 2 are in PIE groups 13 and 14 respectively.

I am not able to understand how to nest or change priorities on groups that seem to have no resisters or access to any kind of control structure.

Correction: 13 and 14 are not on the PIE and are just interrupts.

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CPU Timer with ePWM