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.