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Problem of ADC with DMA

Question asked by zebidi.florian on Jan 28, 2016
Latest reply on Jan 28, 2016 by zebidi.florian

I have a STM32F429I Discovery and I want to sample a signal from a hydrophone of 60-90 KHz before performing an FFT.

I work on Linux with GCC-ARM without EDI. (my build environment)

So here's my problem: I use a code found on the forum to use three ADC with DMA and the value that is returned to me trough a software serial connection are inconsistent, see yourself:

My samples :

Sinus 10 to 100 Hz
Sinus 1 KHz to 10 KHz
Sinus 100 KHz and TTL 100 KHz

And my code :


I use a function generator directly in input of the ADC and my osciloscope confirms that it works.
Have an idea ? Thank you in advance and good day.