TMS320F28379D: CCS

Mohammad Irfan

Part Number: TMS320F28379D

Tool/software:

Hi,

I’m working on a TMS320F28379D-based project where I trigger ADC conversions using ePWM1 SOCA, and read ADC results in the epwm_isr_1() interrupt. The setup involves:

ePWM1 configured in up-down count mode with SOCA triggered on CTR = PRD/Zero

ADC-A configured with multiple SOCs (SOC0–SOC5), all triggered by ePWM1 SOCA

ADCINT1 enabled and mapped to EOC5 (INT1SEL = 5)

In epwm_isr_1(), I wait for ADCINT1 flag, clear it, and then read ADCRESULT4

Despite the interrupt executing correctly and ePWM frequency being correct, the ADC values appear stale or not updated in the ISR.

What is the recommended method to safely synchronize SOC and result reading in epwm_isr_1()?

Screen shots are attached for your reference.

Thanks and best Regards,

Sameer

4 months ago

+1 Stevan Duraskovic 4 months ago

TI__Expert 4690 points

Hello,

You are currently using both ePWM and ADC to set an interrupt. You should choose just one source. For instance, you can set ADCSOC with ePWM trigger submodule and set interrupt when your last ADC conversion is done. Also, you should clear your interrupt flag at the very end of ISR.

0 Mohammad Irfan 4 months ago in reply to Stevan Duraskovic

Prodigy 120 points

Hi,

Thanks for your guidance. it resolved the issue. it was due to not clearing the interrupt flag at the very end of ISR.

Best regards,

Sameer

0 Stevan Duraskovic 4 months ago in reply to Mohammad Irfan

TI__Expert 4690 points

Glad I could help!

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TMS320F28379D: CCS