luo xiaoming
Q
Fork of
RD117_MBED
by 
Maxim Integrated
Diff: algorithm/algorithm.cpp
- Revision:
- 2:560e76e77544
- Parent:
- 1:e88f22c6c1b0
- Child:
- 3:7c0fb55eb3ff
--- a/algorithm/algorithm.cpp Wed Apr 20 23:05:38 2016 +0000
+++ b/algorithm/algorithm.cpp Thu Apr 21 18:25:34 2016 +0000
@@ -84,31 +84,31 @@
{
- uint32_t irMean ,onlyOnce ;
- int32_t k ,iRatioCount;
- int32_t i,s ,m, exact_ir_valley_locs_count ,middleIdx;
- int32_t th1, n_npks,cMin;
- int32_t ir_valley_locs[15] ;
- int32_t exact_ir_valley_locs[15] ;
- int32_t dx_peak_locs[15] ;
- int32_t peakintervalSum;
+ uint32_t un_ir_mean ,un_only_once ;
+ int32_t k ,n_i_ratio_count;
+ int32_t i,s ,m, n_exact_ir_valley_locs_count ,n_middle_idx;
+ int32_t n_th1, n_npks,n_c_min;
+ int32_t n_ir_valley_locs[15] ;
+ int32_t n_exact_ir_valley_locs[15] ;
+ int32_t n_dx_peak_locs[15] ;
+ int32_t n_peak_interval_sum;
- int32_t yAC, xAC;
- int32_t spo2calc;
- int32_t yDCmax, xDCmax;
- int32_t yDCmaxIdx, xDCmaxIdx;
- int32_t ratio[5],ratioAverage;
- int32_t nume, denom ;
+ int32_t n_y_ac, n_x_ac;
+ int32_t n_spo2_calc;
+ int32_t n_y_dc_max, n_x_dc_max;
+ int32_t n_y_dc_max_idx, n_x_dc_max_idx;
+ int32_t n_ratio[5],n_ratio_average;
+ int32_t n_nume, n_denom ;
// remove DC of ir signal
- irMean =0;
- for (k=0 ; k<n_ir_buffer_length ; k++ ) irMean += un_ir_buffer[k] ;
- irMean =irMean/n_ir_buffer_length ;
- for (k=0 ; k<n_ir_buffer_length ; k++ ) n_x[k] = un_ir_buffer[k] - irMean ;
+ un_ir_mean =0;
+ for (k=0 ; k<n_ir_buffer_length ; k++ ) un_ir_mean += un_ir_buffer[k] ;
+ un_ir_mean =un_ir_mean/n_ir_buffer_length ;
+ for (k=0 ; k<n_ir_buffer_length ; k++ ) n_x[k] = un_ir_buffer[k] - un_ir_mean ;
// 4 pt Moving Average
for(k=0; k< BUFFER_SIZE-MA4_SIZE; k++){
- denom= ( n_x[k]+n_x[k+1]+ n_x[k+2]+ n_x[k+3]);
- n_x[k]= denom/(int32_t)4;
+ n_denom= ( n_x[k]+n_x[k+1]+ n_x[k+2]+ n_x[k+3]);
+ n_x[k]= n_denom/(int32_t)4;
}
// get difference of smoothed IR signal
@@ -132,20 +132,20 @@
}
- th1=0; // threshold calculation
+ n_th1=0; // threshold calculation
for ( k=0 ; k<BUFFER_SIZE-HAMMING_SIZE ;k++){
- th1 += ((n_dx[k]>0)? n_dx[k] : ((int32_t)0-n_dx[k])) ;
+ n_th1 += ((n_dx[k]>0)? n_dx[k] : ((int32_t)0-n_dx[k])) ;
}
- th1= th1/ ( BUFFER_SIZE-HAMMING_SIZE);
+ n_th1= n_th1/ ( BUFFER_SIZE-HAMMING_SIZE);
// peak location is acutally index for sharpest location of raw signal since we flipped the signal
- maxim_find_peaks( dx_peak_locs, &n_npks, n_dx, BUFFER_SIZE-HAMMING_SIZE, th1, 8, 5 );//peak_height, peak_distance, max_num_peaks
+ maxim_find_peaks( n_dx_peak_locs, &n_npks, n_dx, BUFFER_SIZE-HAMMING_SIZE, n_th1, 8, 5 );//peak_height, peak_distance, max_num_peaks
- peakintervalSum =0;
+ n_peak_interval_sum =0;
if (n_npks>=2){
for (k=1; k<n_npks; k++)
- peakintervalSum += (dx_peak_locs[k] -dx_peak_locs[k -1] ) ;
- peakintervalSum =peakintervalSum/(n_npks-1);
- *n_heart_rate =(int32_t)( 6000/ peakintervalSum );// beats per minutes
+ n_peak_interval_sum += (n_dx_peak_locs[k] -n_dx_peak_locs[k -1] ) ;
+ n_peak_interval_sum =n_peak_interval_sum/(n_npks-1);
+ *n_heart_rate =(int32_t)( 6000/ n_peak_interval_sum );// beats per minutes
//prlongf(">>> *n_heart_rate= %d \n", *n_heart_rate) ;
*ch_hr_valid = 1;
}
@@ -155,7 +155,7 @@
}
for ( k=0 ; k<n_npks ;k++)
- ir_valley_locs[k]= dx_peak_locs[k] +HAMMING_SIZE /2;
+ n_ir_valley_locs[k]= n_dx_peak_locs[k] +HAMMING_SIZE /2;
// raw value : RED(=y) and IR(=X)
@@ -165,26 +165,26 @@
n_y[k] = un_red_buffer[k] ;
}
- // find precise min near ir_valley_locs
- exact_ir_valley_locs_count =0;
+ // find precise min near n_ir_valley_locs
+ n_exact_ir_valley_locs_count =0;
for ( k=0 ; k<n_npks ;k++){
- onlyOnce =1;
- m=ir_valley_locs[k];
- cMin= 16777216;//2^24;
+ un_only_once =1;
+ m=n_ir_valley_locs[k];
+ n_c_min= 16777216;//2^24;
if (m+5 < BUFFER_SIZE-HAMMING_SIZE && m-5 >0){
for(i= m-5;i<m+5; i++)
- if (n_x[i]<cMin){
- if (onlyOnce >0){
- onlyOnce =0;
+ if (n_x[i]<n_c_min){
+ if (un_only_once >0){
+ un_only_once =0;
}
- cMin= n_x[i] ;
- exact_ir_valley_locs[k]=i;
+ n_c_min= n_x[i] ;
+ n_exact_ir_valley_locs[k]=i;
}
- if (onlyOnce ==0) exact_ir_valley_locs_count ++ ;
+ if (un_only_once ==0) n_exact_ir_valley_locs_count ++ ;
}
}
- if (exact_ir_valley_locs_count <2 ){
+ if (n_exact_ir_valley_locs_count <2 ){
*n_spo2 = -999 ; // do not use SPO2 since signal ratio is out of range
*ch_spo2_valid = 0;
return;
@@ -196,14 +196,14 @@
}
- //using exact_ir_valley_locs , find ir-red DC andir-red AC for SPO2 calibration ratio
+ //using n_exact_ir_valley_locs , find ir-red DC andir-red AC for SPO2 calibration ratio
//finding AC/DC maximum of raw ir * red between two valley locations
- ratioAverage =0;
- iRatioCount = 0;
+ n_ratio_average =0;
+ n_i_ratio_count = 0;
- for(k=0; k< 5; k++) ratio[k]=0;
- for (k=0; k< exact_ir_valley_locs_count; k++){
- if (exact_ir_valley_locs[k] > BUFFER_SIZE ){
+ for(k=0; k< 5; k++) n_ratio[k]=0;
+ for (k=0; k< n_exact_ir_valley_locs_count; k++){
+ if (n_exact_ir_valley_locs[k] > BUFFER_SIZE ){
*n_spo2 = -999 ; // do not use SPO2 since valley loc is out of range
*ch_spo2_valid = 0;
return;
@@ -212,50 +212,50 @@
// find max between two valley locations
// and use ratio betwen AC compoent of Ir & Red and DC compoent of Ir & Red for SPO2
- for (k=0; k< exact_ir_valley_locs_count-1; k++){
- yDCmax= -16777216 ;
- xDCmax= - 16777216;
- // printf("range=%d: %d\n ", exact_ir_valley_locs[k], exact_ir_valley_locs[k+1]);
- if (exact_ir_valley_locs[k+1]-exact_ir_valley_locs[k] >10){
- for (i=exact_ir_valley_locs[k]; i< exact_ir_valley_locs[k+1]; i++){
+ for (k=0; k< n_exact_ir_valley_locs_count-1; k++){
+ n_y_dc_max= -16777216 ;
+ n_x_dc_max= - 16777216;
+ // printf("range=%d: %d\n ", n_exact_ir_valley_locs[k], n_exact_ir_valley_locs[k+1]);
+ if (n_exact_ir_valley_locs[k+1]-n_exact_ir_valley_locs[k] >10){
+ for (i=n_exact_ir_valley_locs[k]; i< n_exact_ir_valley_locs[k+1]; i++){
- if (n_x[i]> xDCmax) {xDCmax =n_x[i];xDCmaxIdx =i; }
- if (n_y[i]> yDCmax) {yDCmax =n_y[i];yDCmaxIdx=i;}
+ if (n_x[i]> n_x_dc_max) {n_x_dc_max =n_x[i];n_x_dc_max_idx =i; }
+ if (n_y[i]> n_y_dc_max) {n_y_dc_max =n_y[i];n_y_dc_max_idx=i;}
}
- yAC= (n_y[exact_ir_valley_locs[k+1]] - n_y[exact_ir_valley_locs[k] ] )*(yDCmaxIdx -exact_ir_valley_locs[k]); //red
- yAC= n_y[exact_ir_valley_locs[k]] + yAC/ (exact_ir_valley_locs[k+1] - exact_ir_valley_locs[k]) ;
+ n_y_ac= (n_y[n_exact_ir_valley_locs[k+1]] - n_y[n_exact_ir_valley_locs[k] ] )*(n_y_dc_max_idx -n_exact_ir_valley_locs[k]); //red
+ n_y_ac= n_y[n_exact_ir_valley_locs[k]] + n_y_ac/ (n_exact_ir_valley_locs[k+1] - n_exact_ir_valley_locs[k]) ;
- yAC= n_y[yDCmaxIdx] - yAC; // subracting linear DC compoenents from raw
- xAC= (n_x[exact_ir_valley_locs[k+1]] - n_x[exact_ir_valley_locs[k] ] )*(xDCmaxIdx -exact_ir_valley_locs[k]); // ir
- xAC= n_x[exact_ir_valley_locs[k]] + xAC/ (exact_ir_valley_locs[k+1] - exact_ir_valley_locs[k]);
- xAC= n_x[yDCmaxIdx] - xAC; // subracting linear DC compoenents from raw
- nume=( yAC *xDCmax)>>7 ; //prepare X100 to preserve floating value
- denom= ( xAC *yDCmax)>>7;
- if (denom>0 && iRatioCount <5 && nume != 0)
+ n_y_ac= n_y[n_y_dc_max_idx] - n_y_ac; // subracting linear DC compoenents from raw
+ n_x_ac= (n_x[n_exact_ir_valley_locs[k+1]] - n_x[n_exact_ir_valley_locs[k] ] )*(n_x_dc_max_idx -n_exact_ir_valley_locs[k]); // ir
+ n_x_ac= n_x[n_exact_ir_valley_locs[k]] + n_x_ac/ (n_exact_ir_valley_locs[k+1] - n_exact_ir_valley_locs[k]);
+ n_x_ac= n_x[n_y_dc_max_idx] - n_x_ac; // subracting linear DC compoenents from raw
+ n_nume=( n_y_ac *n_x_dc_max)>>7 ; //prepare X100 to preserve floating value
+ n_denom= ( n_x_ac *n_y_dc_max)>>7;
+ if (n_denom>0 && n_i_ratio_count <5 && n_nume != 0)
{
- ratio[iRatioCount]= (nume*100)/denom ; //formular is ( yAC *xDCmax) / ( xAC *yDCmax) ;
- iRatioCount++;
+ n_ratio[n_i_ratio_count]= (n_nume*100)/n_denom ; //formular is ( n_y_ac *n_x_dc_max) / ( n_x_ac *n_y_dc_max) ;
+ n_i_ratio_count++;
}
}
- // prlongf("ratio[%d]= %d exact_ir_valley_locs[k] =%d , exact_ir_valley_locs[%d] =%d \n",k, ratio[k] ,exact_ir_valley_locs[k] ,k+1, exact_ir_valley_locs[k+1] ) ;
- // prlongf("nume= %d ,denom= %d yAC = %d, xDCmax = %d, xAC= %d, yDCmax = %d\n",nume, denom, yAC ,xDCmax ,xAC ,yDCmax );
+ // prlongf("n_ratio[%d]= %d n_exact_ir_valley_locs[k] =%d , n_exact_ir_valley_locs[%d] =%d \n",k, n_ratio[k] ,n_exact_ir_valley_locs[k] ,k+1, n_exact_ir_valley_locs[k+1] ) ;
+ // prlongf("n_nume= %d ,n_denom= %d n_y_ac = %d, n_x_dc_max = %d, n_x_ac= %d, n_y_dc_max = %d\n",n_nume, n_denom, n_y_ac ,n_x_dc_max ,n_x_ac ,n_y_dc_max );
}
- maxim_sort_ascend(ratio, iRatioCount);
- middleIdx= iRatioCount/2;
+ maxim_sort_ascend(n_ratio, n_i_ratio_count);
+ n_middle_idx= n_i_ratio_count/2;
- if (middleIdx >1)
- ratioAverage =( ratio[middleIdx-1] +ratio[middleIdx])/2; // use median
+ if (n_middle_idx >1)
+ n_ratio_average =( n_ratio[n_middle_idx-1] +n_ratio[n_middle_idx])/2; // use median
else
- ratioAverage = ratio[middleIdx ];
+ n_ratio_average = n_ratio[n_middle_idx ];
- if( ratioAverage>2 && ratioAverage <184){
- spo2calc= uch_spo2_table[ratioAverage] ;
- *n_spo2 = spo2calc ;
- *ch_spo2_valid = 1;// float_SPO2 = -45.060*ratioAverage* ratioAverage/10000 + 30.354 *ratioAverage/100 + 94.845 ; // for comparison with table
+ if( n_ratio_average>2 && n_ratio_average <184){
+ n_spo2_calc= uch_spo2_table[n_ratio_average] ;
+ *n_spo2 = n_spo2_calc ;
+ *ch_spo2_valid = 1;// float_SPO2 = -45.060*n_ratio_average* n_ratio_average/10000 + 30.354 *n_ratio_average/100 + 94.845 ; // for comparison with table
}
else{
*n_spo2 = -999 ; // do not use SPO2 since signal ratio is out of range
@@ -289,21 +289,21 @@
* \retval None
*/
{
- int32_t i = 1, width;
+ int32_t i = 1, n_width;
*n_npks = 0;
while (i < n_size-1){
if (n_x[i] > n_min_height && n_x[i] > n_x[i-1]){ // find left edge of potential peaks
- width = 1;
- while (i+width < n_size && n_x[i] == n_x[i+width]) // find flat peaks
- width++;
- if (n_x[i] > n_x[i+width] && (*n_npks) < 15 ){ // find right edge of peaks
+ n_width = 1;
+ while (i+n_width < n_size && n_x[i] == n_x[i+n_width]) // find flat peaks
+ n_width++;
+ if (n_x[i] > n_x[i+n_width] && (*n_npks) < 15 ){ // find right edge of peaks
n_locs[(*n_npks)++] = i;
// for flat peaks, peak location is left edge
- i += width+1;
+ i += n_width+1;
}
else
- i += width;
+ i += n_width;
}
else
i++;
@@ -321,17 +321,17 @@
*/
{
- int32_t i, j, old_npks, dist;
+ int32_t i, j, n_old_npks, n_dist;
/* Order peaks from large to small */
maxim_sort_indices_descend( n_x, n_locs, *n_npks );
for ( i = -1; i < *n_npks; i++ ){
- old_npks = *n_npks;
+ n_old_npks = *n_npks;
*n_npks = i+1;
- for ( j = i+1; j < old_npks; j++ ){
- dist = n_locs[j] - ( i == -1 ? -1 : n_locs[i] ); // lag-zero peak of autocorr is at index -1
- if ( dist > n_min_distance || dist < -n_min_distance )
+ for ( j = i+1; j < n_old_npks; j++ ){
+ n_dist = n_locs[j] - ( i == -1 ? -1 : n_locs[i] ); // lag-zero peak of autocorr is at index -1
+ if ( n_dist > n_min_distance || n_dist < -n_min_distance )
n_locs[(*n_npks)++] = n_locs[j];
}
}
@@ -349,12 +349,12 @@
* \retval None
*/
{
- int32_t i, j, temp;
+ int32_t i, j, n_temp;
for (i = 1; i < n_size; i++) {
- temp = n_x[i];
- for (j = i; j > 0 && temp < n_x[j-1]; j--)
+ n_temp = n_x[i];
+ for (j = i; j > 0 && n_temp < n_x[j-1]; j--)
n_x[j] = n_x[j-1];
- n_x[j] = temp;
+ n_x[j] = n_temp;
}
}
@@ -367,12 +367,12 @@
* \retval None
*/
{
- int32_t i, j, temp;
+ int32_t i, j, n_temp;
for (i = 1; i < n_size; i++) {
- temp = n_indx[i];
- for (j = i; j > 0 && n_x[temp] > n_x[n_indx[j-1]]; j--)
+ n_temp = n_indx[i];
+ for (j = i; j > 0 && n_x[n_temp] > n_x[n_indx[j-1]]; j--)
n_indx[j] = n_indx[j-1];
- n_indx[j] = temp;
+ n_indx[j] = n_temp;
}
}