![]() Then I found an STM32 application note (AN4841) stating that the fastest FIR calculation is with float32, followed by Q31, followed by Q15. Is blocksize = 1? So *pSrc and *pDst point to only one value? Will the previous values remain stored in pState of arm_fir_instance_f32? How is the ring buffer realized or is it all in the CMSIS functions? All the examples I found calculate a large number of stored samples and create a complete waveform output instead of just the current output value. Select Generate MATLAB code from the File menu, choose Filter Design Function and specify the filename in the Generate MATLAB code dialog box. This enables you to embed your design into existing code or automate the creation of your filters in a script. Now I want to change this to CMSIS FIR functions to increase speed and test Q15 and Q31 types, but I struggle with my realtime approach with one new value for every calculation run. Filter Designer allows you to generate MATLAB code to re-create your filter. All this runs fine for me, feeding the system with a frequency sweep I can see on an oscilloscope the low pass function at DAC output signal. ![]() Then I run one filter calculation and get an output for this point in time. The input buffer is filled with one new value periodically at sample frequency with the output of an ADC. With these I programmed a standard FIR filter algorithm in C. Also I have an input buffer of 32 values that I designed as a ring buffer. Later, there was disappointment when the pool filters were backwashed and wastewater was found running from the pools plant area down a street toward the. ![]() This is a low pass filter with an order of 31, so 32 coefficients. I am new to DSP things and I just built my first test project.
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