Test and study how FMAC (Filter Math ACcelerator) works

• NUCLEO-G474RE_FMAC_Adaptive_FIR_AN5305 = first try but did not proceed, just print out data of 2 tones
• NUCLEO-G474RE_FMAC_FIR_DMAToIT = no activiry
• NUCLEO-G474RE_FMAC_FIR_PollingToIT = modify to printout data after FMAC, added waveforms, added excel plot and analysis

2021-02-05

• Added this readme

2021-02-06

• Added waveforms on the duration of each codes

2021-02-17

• Tests are done on NUCLEO-G474RE_FMAC_FIR_PollingToIT
• Use HSE instead of HSI
• Use aCalculatedFilteredData1 and aCalculatedFilteredData2 and append data
• Offset the signal so all of it are positive and no negative before feeding to the FMAC
• changed GAIN to 0, GAIN = 1
• Filter using Low Pass and High Pass
• Exported to excel and graphs

2021-02-18

• uploaded excel waveforms

2021-03-03

• Added Sine1k_15k from NUCLEO-G474RE_2tonegenerator and check if still can apply filter.

Excel waveforms

• Initially worked on original data of AC signal Integer input then converted to Float. This is not necessary as FMAC will process Q15

  Input conveted to Float

  

  Input FFT using excel and some arbitrary sampling rate

  

  Low pass filter coeffs

  

  Low pass filter output

  

  High pass filter coeffs

  

  High pass filter output

  

  Very low pass filter coeffs

  

  Very low pass filter

  

• Now add DC offset to simulate input going to the ADC pin like a voltage feedback where input is only positive, These data are not converted to float and all are Q15

  Input Integer w/ offset. Signals are 2 frequencies

  

  Low pass filter coeffs

  

  Low pass filter output, high frequency signal is removed

  

  Low pass filter output calculated FFT using excel

  

  High pass filter coeffs

  

  High pass filter output, low frequency signal is removed

  

  High pass filter output calculated FFT using excel

  

  Sine1k_15k input Line

  

  Sine1k_15k input Bar

  

  Sine1k_15k output HPF

  

  Sine1k_15k output LPF

  

Other References :

STM32F429I-DISC1_FIR_FFT_wth_Print Project

CMSIS DSP

Use of FMAC for Real Time FIR/IIR Filter

Disclaimer: Updated Disclaimer

The projects posted here are for my Personal reference, learning and educational purposes only. The purpose of a certain project may be for testing a module and may be just a part of a whole project. It should not be used in a production or commercial environment. Any cause of injury and/or death is the sole responsibility of the user.