ADC completion for multiple SOC's triggered by the same source (28069)

John Lagerquist

I have a number of channels all triggered by the same source. Due to the round-robin scheduling, I don't know which channel will be completed last. How can I determine when all of the conversions are complete? I don't have enough ADC interrupts to assign one to each channel.

over 13 years ago

0 Daniel Chang over 13 years ago

TI__Expert 4120 points

Hi,

How many ADC sequences do you have? If you have only one, you can determine the exact order, using your configuration and the RR priority rules. If some signals need to occur before others, you can try using priority or just re-ordering them in the configuration. You can know when they complete using either an ADC interrupt or calculating the cycles.

Regards,

Daniel

0 Daniel Chang over 13 years ago in reply to Daniel Chang

TI__Expert 4120 points

In a system with only one ADC sequence, the ADC input tied to the last SOC is converted last.

0 John Lagerquist over 13 years ago in reply to Daniel Chang

Intellectual 695 points

I have two asynchronous sequences. No channels are shared between the two sequences. I will look into the priority some more.

0 Daniel Chang over 13 years ago in reply to John Lagerquist

TI__Expert 4120 points

If you can provide more info on the sequences and why this a concern for you, I can help you more. As it is, I don't see why there is trouble knowing which channel finishes last. If sequence one uses SOC 0-7 and sequence two uses SOC 8-15, either 7 or 15 will always be the last in each sequence.

0 John Lagerquist over 13 years ago in reply to Daniel Chang

Intellectual 695 points

That's how ended up implementing it. Works great!

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ADC completion for multiple SOC's triggered by the same source (28069)