I plugged a CN-0540 into a NUCLEO-L496ZG. I then ported the Example Program to STM32CubeIDE without Mbed.
As a sort of verification test, I connected a 1 kΩ resistor across P1 (GND and VIN) and did 17 - Do the FFT, which yielded:
THD:-2.038 dB
SNR:-7.394 dB
DR:104.990 dB
Fundamental:-117.300 dBFS
Fundamental:148.438 Hz
RMS noise:25.390626 uV
LSB noise:52.000
12 - Read ADC master status reports no FAULTs. Then, I did 18 - FFT settings, 3 - Print FFT plot, and then graphed the results:
I connected a Wilcoxon 786A general purpose accelerometer.
With the accelerometer just lying on the bench, FFT yielded:
THD: -1.475 dB
SNR: -1.380 dB
DR: 98.336 dB
Fundamental: -102.672 dBFS
Fundamental: 179.688 Hz
RMS noise: 83.984378 uV
LSB noise: 172.000
I (loosely) attached a vibrator and got this:
THD: -7.439 dB
SNR: -4.976 dB
DR: 51.531 dB
Fundamental: -56.702 dBFS
Fundamental: 1210.938 Hz
RMS noise: 9252.442047 uV
LSB noise: 18949.000
- STM32CubeIDE
- CMSIS-DSP libraries. Some information about how to install the libraries can be found at