OMAPL138B-EP: How to calculate coefficient for BPF and butterworth filter in real all-pole IIR filter in lattice structure

Part Number:OMAPL138B-EP

Dear Sir,

We want to use IIR filter on our input signal.I found out some example code for IIR filter.We want to calculate  coefficient for different cut off frequencies for BPF and butter worth filter.

The example code did not mentioned about the calculations.It has a hardcoded value.

Please let us know how to calculate those coefficients

Details are given below

1.CCS version :-7.3.0.00019 

2.DSP library:-dsplib_c674x_3_4_0_0

3.Example project:-DSPF_sp_iirlat

4.Board :-LCDK_OMAPL138

Regards,

Satheesh