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IIR functions in DSP libraries (STM32F407xx)

Question asked by zach.juergen on Sep 28, 2012
Dear colleagues,

      are there any stable libraries for IIR (recursive) filters for the STM32F4x, aside of the CMSIS DSP software library? The CMSIS has only lattice (arm_iir_lattice***) or biquad (arm_biquad_cascade***) implementations. I'm simply looking for a straightforward regular implementation with recursive b[n] and a[n] coefficients. Only up to n=5 or 6, so the biquad functions are an overkill; plus, I would like to avoid having to calculate the coefficients (I've got tons of filters in standard recursive form).

Thanks for any hints,