CCS/TMS320F28035: ADC triggering using EPWM for 8x oversampling .

Indrajit Lawande95

Part Number: TMS320F28035

Tool/software: Code Composer Studio

Hi , I am using TMS320F28035 controller . I have to over-sample the ADC signal . So i will use EPWM in UP-DOWN mode and at Zero , CMPA, CMPB , TBPRD events for triggering ADC.

Is following configuration trigger the ADC same channel for 4 different events ?

AdcRegs.ADCSOC1CTL.bit.TRIGSEL = ePWM1SOCA | ePWM1SOCB | ePWM2SOCA | ePWM2SOCB ; /* 5 | 6 | 7 | 8 => corresponding trig select values. */

will this instruction trigger the particular ADC channel 4 times ??

If not suggest me other method. for triggering same channel multiple times.

Thanks and Regards,

Indrajit.

over 8 years ago

0 Baskaran Chidambaram over 8 years ago

TI__Genius 17370 points

Hello,
I am writing to let you know that a C2000 team member has been assigned to this post and should be answering shortly.

Regards
Baskaran

0 tlee over 8 years ago

TI__Guru 62975 points

Indrajit,

You will not be able to use multiple trigger sources for a single SOC (although a single event can trigger multiple SOCs).

You can instead configure 4 SOCs with each SOC triggered by a unique EPWM SOC trigger source.

A second option is to configure 1 SOC that is triggered by a single EPWM with a PRD that is 4 times shorter than your control PRD. This however, will have tighter servicing deadlines. The CLA can help out if it is not currently being used.

-Tommy

0 Indrajit Lawande95 over 8 years ago in reply to tlee

Expert 1350 points

Thank you very much ..
I will try both method.

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CCS/TMS320F28035: ADC triggering using EPWM for 8x oversampling .