how to use 4 channels of ADC(192 KHz signal) with DMA such that out of total decided buffer size of 4096, we can populate the first 1024 buffers with ADC channel 1 , second 1024 buffers with adc channel 2 and so on ?

[NKarn.1]

I am building a radar back end wherein I have to process 4 ADC channels coming in from radar front end and want to do processing on each channel and want to store the adc values in the buffer so that I can do DSP on it.

[TDK]

This cannot be done directly out of the DMA. You'll have to postprocess the values to arrange them how you want.

[NKarn.1]

Hi ,Thanks for the reply. Can you elaborate on what you meant by postprocessing the values.?

[TDK]

Suppose your buffer length is 16. When the ADC/DMA is complete, your values in memory will be

`1234123412341234`

where 1 is a result from channel 1, 2 is from channel 2, etc.

You need to rearrange them so they are in the order:

`1111222233334444`

There's probably a way to do this with a minimal amount of temporary storage needed, but you could also create a separate 4096 size buffer and move them into that buffer in the correct order.

[NKarn.1]

Thanks... I will keep you informed about it goes.

[waclawek.jan]

The DSP routines can be written/modified so that they take into account the staggered input data. Unless you want to throw at them some prechewed libraries you don't have sources for.

JW

[NKarn.1]

Thanks... I will keep you informed about it goes.