ADC module in Concerto

Peter Puerta

In my application I need to acquire the analog values each 25 us, with precise time period. My control application runs in a high priority interrupt, and that takes 65 us to execute.

In the Concerto parts, it seems that the ADC module is controlled by the CPU and the ARM can access (read only) the ADC registers.

I believe that is not possible to configure the ARM to read the ADC results and put them available to the CPU, right?

An alternative is adding a fast external serial ADC converter that is readed by the ARM at each 25 us. Than, the ARM can put the results in the shared RAM for the CPU processor access. But this needs extra hardware.

Does anyone faced the same problem before?

Regards,

Peter

over 12 years ago

0 Igor Gorbachev over 12 years ago

Guru 20525 points

Hi Peter!

For getting more exact info about ADC features of M35 I would recommend you this workshop's material (p.79-86) 3580.F28M35x_Workshop_2-0.pdf.

Regards,

Igor

0 Peter Puerta over 12 years ago in reply to Igor Gorbachev

Prodigy 160 points

From what I understand so far, is that it is possible to program the sample sequence from the CPU. The ARM can receive the corresponding interrupt calls, make some calculations and send back to the CPU the results by the shared memory. Meanwhile, the CPU is processing the critical control algorithm without the need to check if the ADC conversions are finished. I believe that this corresponds to one possible use of the to processors.

Regards,

Peter

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ADC module in Concerto