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iir_filter.c
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iir_filter.c
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#include "iir_filter.h"
//#include "debug_macros.h"
//int16_t new_raw_data;
static int32_t iir_data_out;
alg_data_t m_alg_data_t;
alg_data_t * alg_data = &m_alg_data_t;
void iir_filter_para_init(void)
{
alg_data->iir_data.fir2_dly = 0;
alg_data->iir_data.fir2_dly2 = 0;
alg_data->iir_data.sec1_dly = 0;
alg_data->iir_data.sec1_dly2 = 0;
alg_data->iir_data.sec1_out = 0;
alg_data->iir_data.fir2_dly = 0;
alg_data->iir_data.fir2_dly2 = 0;
alg_data->iir_data.sec2_dly = 0;
alg_data->iir_data.sec2_dly2 = 0;
alg_data->iir_data.out = 0;
}
int32_t iir_filter_process(uint16_t data_ppg,uint8_t data_gsensor,uint8_t low_fre,uint8_t high_fre,uint8_t abnormal_jump_remove)
{
static int32_t fir1 = 0;
static int32_t fir2 = 0;
static int32_t fir1_gsensor = 0;
static int32_t fir2_gsensor = 0;
// alg_data->fifo_num = 0;
// alg_data->clip_cnt = 0;
// ppg data process
fir1 = data_ppg*FIR1_B1 \
+ (alg_data->iir_data.flt_in_dly)*FIR1_B2 \
+ (alg_data->iir_data.flt_in_dly2)*FIR1_B3;
alg_data->iir_data.flt_in_dly2 = alg_data->iir_data.flt_in_dly;
alg_data->iir_data.flt_in_dly = data_ppg;
alg_data->iir_data.sec1_out = fir1 - ((IIR1_A2*(alg_data->iir_data.sec1_dly) + \
IIR1_A3*(alg_data->iir_data.sec1_dly2))>>6);
alg_data->iir_data.sec1_dly2 = alg_data->iir_data.sec1_dly;
alg_data->iir_data.sec1_dly = alg_data->iir_data.sec1_out;
fir2 = alg_data->iir_data.sec1_out*FIR2_B1 + \
(alg_data->iir_data.fir2_dly)*FIR2_B2 + \
(alg_data->iir_data.fir2_dly2)*FIR2_B3;
alg_data->iir_data.fir2_dly2 = alg_data->iir_data.fir2_dly;
alg_data->iir_data.fir2_dly = alg_data->iir_data.sec1_out;
alg_data->iir_data.out = fir2 - ((IIR2_A2*(alg_data->iir_data.sec2_dly) + \
IIR2_A3*(alg_data->iir_data.sec2_dly2))>>6);
alg_data->iir_data.sec2_dly2 = alg_data->iir_data.sec2_dly;
alg_data->iir_data.sec2_dly = alg_data->iir_data.out;
//data_fre[i] = alg_data->iir_data.out; //
iir_data_out = alg_data->iir_data.out;
// gsensor data process
fir1_gsensor = data_gsensor*FIR1_B1 \
+ (alg_data->iir_data_gsen.flt_in_dly)*FIR1_B2 \
+ (alg_data->iir_data_gsen.flt_in_dly2)*FIR1_B3;
alg_data->iir_data_gsen.flt_in_dly2 = alg_data->iir_data_gsen.flt_in_dly;
alg_data->iir_data_gsen.flt_in_dly = data_gsensor;
alg_data->iir_data_gsen.sec1_out = fir1_gsensor - ((IIR1_A2*(alg_data->iir_data_gsen.sec1_dly) + \
IIR1_A3*(alg_data->iir_data_gsen.sec1_dly2))>>6);
alg_data->iir_data_gsen.sec1_dly2 = alg_data->iir_data_gsen.sec1_dly;
alg_data->iir_data_gsen.sec1_dly = alg_data->iir_data_gsen.sec1_out;
fir2_gsensor = alg_data->iir_data_gsen.sec1_out*FIR2_B1 + \
(alg_data->iir_data_gsen.fir2_dly)*FIR2_B2 + \
(alg_data->iir_data_gsen.fir2_dly2)*FIR2_B3;
alg_data->iir_data_gsen.fir2_dly2 = alg_data->iir_data_gsen.fir2_dly;
alg_data->iir_data_gsen.fir2_dly = alg_data->iir_data_gsen.sec1_out;
alg_data->iir_data_gsen.out = fir2_gsensor - ((IIR2_A2*(alg_data->iir_data_gsen.sec2_dly) + \
IIR2_A3*(alg_data->iir_data_gsen.sec2_dly2))>>6);
alg_data->iir_data_gsen.sec2_dly2 = alg_data->iir_data_gsen.sec2_dly;
alg_data->iir_data_gsen.sec2_dly = alg_data->iir_data_gsen.out;
// remove the jump points
if(1 == abnormal_jump_remove)
{
if(alg_data->iir_data.out > 16000)
{
alg_data->iir_data.out = 16000;
}else if(alg_data->iir_data.out < - 16000)
{
alg_data->iir_data.out = -16000;
}
}
//data_fre[i] = alg_data->iir_data_gsen.out; //
//iir_data_out = alg_data->iir_data_gsen.out;
iir_data_out = alg_data->iir_data.out;
return iir_data_out;
}
int32_t iir_filter_process_v2(uint16_t data_ppg,uint8_t data_gsensor,uint8_t low_fre,uint8_t high_fre, uint8_t abnormal_jump_remove)
{
static int32_t fir1 = 0;
static int32_t fir2 = 0;
static int32_t iir_out_fifo [20] = {0};
static int32_t raw_data_diff_fifo [7];
static start_ind = 0;
static end_ind = 19;
static int32_t flt_cnt = 0;
int32_t iir_out = 0;
uint8_t abnormal_jump = 0;
int8_t ii;
static uint16_t data_time_pre = 0;
static int32_t abnormal_jump_ind = 0, abnormal_jump_ind_ref = 0;
static uint8_t abnormal_jump_cnt = 0;
for (ii = 5; ii >= 1; ii--) {
raw_data_diff_fifo[ii+1] = raw_data_diff_fifo[ii];
}
if (flt_cnt > 0)
raw_data_diff_fifo[1] = (data_ppg - data_time_pre);
abnormal_jump_ind = raw_data_diff_fifo[6] + raw_data_diff_fifo[1] + raw_data_diff_fifo[2] \
+ raw_data_diff_fifo[3] + raw_data_diff_fifo[4] + raw_data_diff_fifo[5];
abnormal_jump_ind = abs(abnormal_jump_ind);
if (flt_cnt > 0)
abnormal_jump_ind_ref = (abnormal_jump_ind_ref*(flt_cnt-1) + abnormal_jump_ind + (flt_cnt>>1))/flt_cnt;
else
abnormal_jump_ind_ref = abnormal_jump_ind;
if (abnormal_jump_ind > 4*abnormal_jump_ind_ref) {
abnormal_jump_cnt = 1;
} else if (abnormal_jump_cnt == 60){
abnormal_jump_cnt = 0;
} else if (abnormal_jump_cnt > 0) {
abnormal_jump_cnt ++;
}
abnormal_jump = (abnormal_jump_cnt > 0)? 1:0;
fir1 = data_ppg*FIR1_B1 \
+ (alg_data->iir_data.flt_in_dly)*FIR1_B2 \
+ (alg_data->iir_data.flt_in_dly2)*FIR1_B3;
alg_data->iir_data.flt_in_dly2 = alg_data->iir_data.flt_in_dly;
alg_data->iir_data.flt_in_dly = data_ppg;
alg_data->iir_data.sec1_out = fir1 - ((IIR1_A2*(alg_data->iir_data.sec1_dly) + \
IIR1_A3*(alg_data->iir_data.sec1_dly2))>>6);
alg_data->iir_data.sec1_dly2 = alg_data->iir_data.sec1_dly;
alg_data->iir_data.sec1_dly = alg_data->iir_data.sec1_out;
fir2 = alg_data->iir_data.sec1_out*FIR2_B1 + \
(alg_data->iir_data.fir2_dly)*FIR2_B2 + \
(alg_data->iir_data.fir2_dly2)*FIR2_B3;
alg_data->iir_data.fir2_dly2 = alg_data->iir_data.fir2_dly;
alg_data->iir_data.fir2_dly = alg_data->iir_data.sec1_out;
iir_out = fir2 - ((IIR2_A2*(alg_data->iir_data.sec2_dly) + \
IIR2_A3*(alg_data->iir_data.sec2_dly2))>>6);
alg_data->iir_data.sec2_dly2 = alg_data->iir_data.sec2_dly;
alg_data->iir_data.sec2_dly = iir_out;
flt_cnt++;
// printf("Remove data at %d %d %d %d %d %d %d\n", flt_cnt, data_time, data_time_pre, abnormal_jump_ind, abnormal_jump_ind_ref, \
// abnormal_jump, abnormal_jump);
// printf("fifo: %d %d %d %d %d %d %d\n", raw_data_diff_fifo[6], raw_data_diff_fifo[5], raw_data_diff_fifo[4], raw_data_diff_fifo[3], \
// raw_data_diff_fifo[2], raw_data_diff_fifo[1], raw_data_diff_fifo[0] );
if (flt_cnt >=21) { //fifo full,begin to output
if ((abnormal_jump == 0) || (abnormal_jump_remove == 0)) {
alg_data->iir_data.out = iir_out_fifo[end_ind];
} else {
alg_data->iir_data.out = 0;
printf("Remove data at %d\n", flt_cnt);
}
iir_out_fifo[start_ind] = iir_out;
start_ind++;
end_ind++;
if (start_ind > 20)
start_ind = 0;
if (end_ind > 20)
end_ind = 0;
}
//data_fre[i] = alg_data->iir_data.out; //
data_time_pre = data_ppg;
// printf("FIlter out: %d %d %d %d %d %d %d %d\n", \
// data_time, fir1, IIR1_A2, ((IIR1_A2*(alg_data->iir_data.sec1_dly) + \
// IIR1_A3*(alg_data->iir_data.sec1_dly2))>>6), \
// alg_data->iir_data.sec1_out, alg_data->iir_data.sec1_dly, \
// IIR1_A2*(alg_data->iir_data.sec1_dly), alg_data->iir_data.out);
}