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Hi,
I would like to enable center-aligned PWM across 3 PWM modules so I can trigger ADC conversions during the low period of the PWM signals. I see that the ePWM module has an up/down counter option so it should be theoretically possible. Does anyone know the steps for setting up what I've described above on TMS320F2800157 MCU?
Thanks.
Hello Anurag,
Yes its possible to configure pwm output as center-aligned or edge aligned.
For center-aligned output, I would suggest using up-down count mode of the module and set the CMPA/CMPB values such the the pulse is centered around the period as shown below.
For triggering adc conversion I would suggest referring to the 14.10 Event-Trigger (ET) Submodule in the Technical reference manual. The ET submodule can be used to start adc conversion on specific events set by user code. For starters I would advice to begin with epwm examples available in C2000WARE.
Thanks.