TMS320F28035: ADC result register read/write

Matias Anun

Part Number: TMS320F28035

Dear TI community,

We are normally concerned about reading an ADC result register while the peripheral is writing to it but I have my doubts about this being a real potential issue.

I was able to find documentation for the TMS320x281x DSP where it is stated that this is taken care of and there is no risk when reading a result asynchronously from the SOC and EOC.

However I have not been able to find this information for piccolo 28035 specifically. Could anybody point out to documentation for this particular DSP? (if any)

In case it helps, this is the way we are operating the ADC for a power converter:

- PWM is issuing the SOC to converter 15 channels with priority.

- The EOC is set to trigger after the 3rd conversion where we process the first 3 results for real time control.

- The remaining of the results are read asynchronously when needed by the system.

Thanks for your help.

Best regards,

Matias

over 7 years ago

0 tlee over 7 years ago

TI__Guru 62975 points

Matias,

There should be no problem with reading the ADCRESULT registers asynchronously with ADC operation. Arbitration for simultaneous access is handled automatically. At worst, you would read back the previously valid ADCRESULT value before the new value replaces it on the next clock cycle.

-Tommy

0 Matias Anun over 7 years ago in reply to tlee

Intellectual 360 points

Hi Tommy,

Thanks for the quick response. Is there any documentation for Piccolo stating this fact?

Matias

0 tlee over 7 years ago in reply to Matias Anun

TI__Guru 62975 points

Matias,

I don't think that this is explicitly stated in published documentation.

-Tommy

0 Victor Lazzaroli over 7 years ago

Prodigy 50 points

Hi Matias,

I've the same doubt with 28335 DSP. Can you please provide a link of the documentation of the TMS320x281x DSP (and the page) where you find the information?
So I can try to find the same for my DSP model.

Thank you.

0 Matias Anun over 7 years ago in reply to Victor Lazzaroli

Intellectual 360 points

Hi Victor,

Here is the link www.ti.com/lit/ug/spru060d/spru060d.pdf

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TMS320F28035: ADC result register read/write