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Dependencies:   mbed 4DGL-uLCD-SE mbed-rtos AD5206

wave.cpp@10:159f38636ed4, 2015-12-01 (annotated)

Committer:
hanjiex
Date:
Tue Dec 01 18:59:42 2015 +0000
Revision:
10:159f38636ed4
extern issue

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hanjiex 10:159f38636ed4 1 /*
hanjiex 10:159f38636ed4 2 * wave.cpp
hanjiex 10:159f38636ed4 3 *
hanjiex 10:159f38636ed4 4 */
hanjiex 10:159f38636ed4 5
hanjiex 10:159f38636ed4 6 #include "mbed.h"
hanjiex 10:159f38636ed4 7 #include "wave.h"
hanjiex 10:159f38636ed4 8 #include "para.h"
hanjiex 10:159f38636ed4 9 #include "menu.h"
hanjiex 10:159f38636ed4 10 Serial pc(USBTX, USBRX);
hanjiex 10:159f38636ed4 11 AnalogOut aout(p18);
hanjiex 10:159f38636ed4 12
hanjiex 10:159f38636ed4 13 // from global variable
hanjiex 10:159f38636ed4 14 extern para mypara;
hanjiex 10:159f38636ed4 15 int waveform_type = mypara.get_type();
hanjiex 10:159f38636ed4 16 int freq = mypara.get_freq();
hanjiex 10:159f38636ed4 17 float amp = mypara.get_amp();
hanjiex 10:159f38636ed4 18 float offset = mypara.get_offset();
hanjiex 10:159f38636ed4 19
hanjiex 10:159f38636ed4 20
hanjiex 10:159f38636ed4 21 int datapoint_counter=0;
hanjiex 10:159f38636ed4 22 float duty_cycle=0.2;
hanjiex 10:159f38636ed4 23 int length_waveform=100;
hanjiex 10:159f38636ed4 24 float time_interv=1.0/freq/length_waveform;
hanjiex 10:159f38636ed4 25 uint16_t waveform[100];
hanjiex 10:159f38636ed4 26 int x;
hanjiex 10:159f38636ed4 27 const double pi = 3.14;
hanjiex 10:159f38636ed4 28 void generate_waveform_datapoints(){
hanjiex 10:159f38636ed4 29 float t=0;
hanjiex 10:159f38636ed4 30
hanjiex 10:159f38636ed4 31 //------if sine wave--------
hanjiex 10:159f38636ed4 32 if (waveform_type==0){
hanjiex 10:159f38636ed4 33 for (int counter=0; counter<length_waveform; counter++){
hanjiex 10:159f38636ed4 34 x=amp/3.3*cos(2*pi*freq*t)+offset/3.3;
hanjiex 10:159f38636ed4 35 waveform[counter]=(uint16_t) (x*65535);
hanjiex 10:159f38636ed4 36 t += time_interv;
hanjiex 10:159f38636ed4 37 }
hanjiex 10:159f38636ed4 38 }
hanjiex 10:159f38636ed4 39
hanjiex 10:159f38636ed4 40 //------if square wave--------
hanjiex 10:159f38636ed4 41 if (waveform_type==1){
hanjiex 10:159f38636ed4 42 for (int counter=0; counter<length_waveform; counter++){
hanjiex 10:159f38636ed4 43 if (counter<=length_waveform*duty_cycle){
hanjiex 10:159f38636ed4 44 x=amp/3.3+offset/3.3;
hanjiex 10:159f38636ed4 45 }else{
hanjiex 10:159f38636ed4 46 x=-1.0*amp/3.3+offset/3.3;
hanjiex 10:159f38636ed4 47 }
hanjiex 10:159f38636ed4 48 waveform[counter]=(uint16_t) (x*65535);
hanjiex 10:159f38636ed4 49 }
hanjiex 10:159f38636ed4 50 }
hanjiex 10:159f38636ed4 51
hanjiex 10:159f38636ed4 52 //------if triangle wave---------
hanjiex 10:159f38636ed4 53 if (waveform_type==2){
hanjiex 10:159f38636ed4 54 for (int counter=0; counter<length_waveform/2; counter++){
hanjiex 10:159f38636ed4 55 x=amp/1.65*(2.0*counter/length_waveform-0.5)+offset/3.3;
hanjiex 10:159f38636ed4 56 waveform[counter]=(uint16_t) (x*65535);
hanjiex 10:159f38636ed4 57 }
hanjiex 10:159f38636ed4 58
hanjiex 10:159f38636ed4 59 for (int counter=length_waveform/2; counter<length_waveform; counter++){
hanjiex 10:159f38636ed4 60 waveform[counter]=waveform[length_waveform-counter-1];
hanjiex 10:159f38636ed4 61 }
hanjiex 10:159f38636ed4 62
hanjiex 10:159f38636ed4 63 }
hanjiex 10:159f38636ed4 64 }
hanjiex 10:159f38636ed4 65
hanjiex 10:159f38636ed4 66
hanjiex 10:159f38636ed4 67
hanjiex 10:159f38636ed4 68 void output_waveform_datapoints(){
hanjiex 10:159f38636ed4 69 pc.printf("%d",freq);
hanjiex 10:159f38636ed4 70 for (int counter=0; counter<length_waveform; counter++){
hanjiex 10:159f38636ed4 71 aout.write_u16(waveform[counter]);
hanjiex 10:159f38636ed4 72 wait(time_interv);
hanjiex 10:159f38636ed4 73 }
hanjiex 10:159f38636ed4 74 }
hanjiex 10:159f38636ed4 75
hanjiex 10:159f38636ed4 76
hanjiex 10:159f38636ed4 77 void output_waveform_datapoints_timer_ISR(){
hanjiex 10:159f38636ed4 78 aout.write_u16(waveform[datapoint_counter]);
hanjiex 10:159f38636ed4 79 datapoint_counter++;
hanjiex 10:159f38636ed4 80
hanjiex 10:159f38636ed4 81 if (datapoint_counter==length_waveform-1){datapoint_counter=0;}
hanjiex 10:159f38636ed4 82 }