TMS320F280049: which edge of the EXTSYNCIN1 is used to sync EPWM?

Aki Li

Part Number: TMS320F280049

I would like to use the falling edge of the GPIO pin to sync EPWM, so could you please help check whether it can support? Thank you.

over 5 years ago

0 Subrahmanya over 5 years ago

TI__Mastermind 24095 points

Hi,

Yes - use logic inversion inside GPIO. Please look for GPIOINV register in the device TRM.
Sync is always w.r.t. the rising edge. So, you can simply invert the GPIO pin polarity as needed.

0 Aki Li over 5 years ago in reply to Subrahmanya

TI__Genius 9915 points

Subrahmanya,

Actually, I want to use the falling edge of one EPWM output as a sync signal through X-BAR. It seems that GPIOINV register only applies for the input function?

0 Subrahmanya over 5 years ago in reply to Aki Li

TI__Mastermind 24095 points

Hi Aki,

You should be able to configure the GPxINV to use the inverted version of the PWM.
Refer - Figure 8-1. GPIO Logic for a Single Pin

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TMS320F280049: which edge of the EXTSYNCIN1 is used to sync EPWM?