/* Include library */ #include "fir.h" /* Filter objects */ movingAverage_t fir_ftr; movingAverage_t fir_ftr_2; /* co-eff value calculated from Iowa Hills FIR Filters tool */ float low_pass_coeff[] = { 0.033037850144342927, 0.115593443353483427, 0.195352709288829529, 0.244281564490212016, 0.244281564490212016, 0.195352709288829529, 0.115593443353483427, 0.033037850144342927 }; float high_pass_coeff[] = { 0.020062112266054671, 0.039940619065501934, 0.053593365042411495, 0.053416852363487331, 0.031286041832566183, -0.023735038477653174, -0.142727313632826841, -0.612151054466002487, 0.612151054466002487, 0.142727313632826841, 0.023735038477653174, -0.031286041832566183, -0.053416852363487331, -0.053593365042411495, -0.039940619065501934, -0.020062112266054671 }; void main() { /* Initialization of filters */ fir_create(&fir_ftr, low_pass_coeff, 8, 1.176, 100); /* filter size 8, sample time 100ms */ fir_create(&fir_ftr_2, high_pass_coeff, 16, 1, 150); /* filter size 16, sample time 150ms */ while(1) { signal = signal_source(); /* signal source function may ADC, Capture count, sensor data*/ /* Filter process  *   * call this function maximum passible short time  */ fir_filter(&fir_ftr, signal); fir_filter(&fir_ftr_2, signal); process_or_print = fir_ftr.filtered; process_or_print = fir_ftr_2.filtered; } }