DCS_TEAM / Mbed 2 deprecated DCS

The official code that runs on the FRDM board for the chlorine sensor.

Dependencies:   MBed_Adafruit-GPS-Library SDFileSystem mbed GSM_Library

Fork of DCS by Brandon Crofts

QAM.h@0:d7b2716c5a4f, 2015-03-06 (annotated)

Committer:
bjcrofts
Date:
Fri Mar 06 22:13:58 2015 +0000
Revision:
0:d7b2716c5a4f
Child:
8:6b4a6bcd7694
hoy

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bjcrofts 0:d7b2716c5a4f 1 #include "mbed.h"
bjcrofts 0:d7b2716c5a4f 2 #include "math.h"
bjcrofts 0:d7b2716c5a4f 3 #include "param.h"
bjcrofts 0:d7b2716c5a4f 4
bjcrofts 0:d7b2716c5a4f 5
bjcrofts 0:d7b2716c5a4f 6 float firCoeffs[NUM_TAPS] = 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bjcrofts 0:d7b2716c5a4f 7
bjcrofts 0:d7b2716c5a4f 8 void filter( float *in, Serial *pc)
bjcrofts 0:d7b2716c5a4f 9 {
bjcrofts 0:d7b2716c5a4f 10 float *taps = firCoeffs;
bjcrofts 0:d7b2716c5a4f 11 int i, j;
bjcrofts 0:d7b2716c5a4f 12 float out[SAMPLE_LENGTH] = {};
bjcrofts 0:d7b2716c5a4f 13
bjcrofts 0:d7b2716c5a4f 14 for( i = NUM_TAPS; i < SAMPLE_LENGTH; i++ )
bjcrofts 0:d7b2716c5a4f 15 {
bjcrofts 0:d7b2716c5a4f 16 out[ i ] = 0.0;
bjcrofts 0:d7b2716c5a4f 17 for( j = 0; j < NUM_TAPS; j++ ){
bjcrofts 0:d7b2716c5a4f 18 if(i-j >= 0){
bjcrofts 0:d7b2716c5a4f 19 out[ i ] += in[ i - j ] * taps[ j ];
bjcrofts 0:d7b2716c5a4f 20 }
bjcrofts 0:d7b2716c5a4f 21
bjcrofts 0:d7b2716c5a4f 22 }
bjcrofts 0:d7b2716c5a4f 23 }
bjcrofts 0:d7b2716c5a4f 24
bjcrofts 0:d7b2716c5a4f 25 for( i = 0; i < SAMPLE_LENGTH; i++ )
bjcrofts 0:d7b2716c5a4f 26 {
bjcrofts 0:d7b2716c5a4f 27 in[ i ] = out[i];
bjcrofts 0:d7b2716c5a4f 28 }
bjcrofts 0:d7b2716c5a4f 29 }
bjcrofts 0:d7b2716c5a4f 30
bjcrofts 0:d7b2716c5a4f 31
bjcrofts 0:d7b2716c5a4f 32 float avg_QAM(float *sI, float *sQ, int length){
bjcrofts 0:d7b2716c5a4f 33 int i = 0;
bjcrofts 0:d7b2716c5a4f 34 float total = 0;
bjcrofts 0:d7b2716c5a4f 35 int denom = length - 2*NUM_TAPS;
bjcrofts 0:d7b2716c5a4f 36 for(i = NUM_TAPS; i < length - NUM_TAPS; i++){
bjcrofts 0:d7b2716c5a4f 37 total = total + sqrt(sI[i]*sI[i] + sQ[i]*sQ[i]);
bjcrofts 0:d7b2716c5a4f 38 }
bjcrofts 0:d7b2716c5a4f 39 return total/denom;
bjcrofts 0:d7b2716c5a4f 40 }
bjcrofts 0:d7b2716c5a4f 41
bjcrofts 0:d7b2716c5a4f 42 float QAM(float *sI, float *sQ, Serial *pc){
bjcrofts 0:d7b2716c5a4f 43
bjcrofts 0:d7b2716c5a4f 44 filter(sI, pc);
bjcrofts 0:d7b2716c5a4f 45 filter(sQ, pc);
bjcrofts 0:d7b2716c5a4f 46 return avg_QAM(sI, sQ, SAMPLE_LENGTH);
bjcrofts 0:d7b2716c5a4f 47 }
bjcrofts 0:d7b2716c5a4f 48