IISEC / Mbed 2 deprecated echo_machine

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Dependencies:   mbed

voiceecho.cpp@1:5972dbd390c8, 2019-04-17 (annotated)

Committer:
titanium
Date:
Wed Apr 17 04:53:40 2019 +0000
Revision:
1:5972dbd390c8
Parent:
0:f99e355ba60d
Child:
2:718d996170c2
echo machine v2  pwm enabled

Who changed what in which revision?

UserRevisionLine numberNew contents of line
titanium 0:f99e355ba60d 1 #include "mbed.h"
titanium 0:f99e355ba60d 2
titanium 0:f99e355ba60d 3 DigitalOut led1(LED1);
titanium 0:f99e355ba60d 4 PwmOut pwm(p21);
titanium 0:f99e355ba60d 5 AnalogIn mic(p20);
titanium 0:f99e355ba60d 6 AnalogOut spk(p18);
titanium 1:5972dbd390c8 7 Ticker voicetick;
titanium 0:f99e355ba60d 8
titanium 0:f99e355ba60d 9 #define WAVMAX 7000 /*buffer size; SAMPFREQ*DEALY<WAVMAX*/
titanium 0:f99e355ba60d 10 #define SAMPFREQ 16000.0
titanium 0:f99e355ba60d 11 #define DELAY 0.25 /*s*/
titanium 0:f99e355ba60d 12
titanium 0:f99e355ba60d 13 unsigned short wave[WAVMAX];
titanium 0:f99e355ba60d 14 int readindex=0, writeindex=0;
titanium 0:f99e355ba60d 15
titanium 0:f99e355ba60d 16 class KBline : public Serial
titanium 0:f99e355ba60d 17 {
titanium 0:f99e355ba60d 18 public:
titanium 0:f99e355ba60d 19 char line[100];
titanium 0:f99e355ba60d 20 int index;
titanium 0:f99e355ba60d 21 int receiving; //status 0=not started, 1=waiting, 2=receiving, 3=end
titanium 0:f99e355ba60d 22 private:
titanium 0:f99e355ba60d 23 void serialirq()
titanium 0:f99e355ba60d 24 {
titanium 0:f99e355ba60d 25 char ch;
titanium 0:f99e355ba60d 26 if (this->readable()) {
titanium 0:f99e355ba60d 27 ch=this->getc();
titanium 0:f99e355ba60d 28 switch(ch) { //simple line editing
titanium 0:f99e355ba60d 29 case '\n':
titanium 0:f99e355ba60d 30 case '\r': //LF and CR terminate reading
titanium 0:f99e355ba60d 31 line[index++]=ch;
titanium 0:f99e355ba60d 32 line[index++]=0;
titanium 0:f99e355ba60d 33 this->printf("\r\n");
titanium 0:f99e355ba60d 34 receiving=3;
titanium 0:f99e355ba60d 35 break;
titanium 0:f99e355ba60d 36 case 21: /* control-U cancels entire line*/
titanium 0:f99e355ba60d 37 this->printf("\n\r");
titanium 0:f99e355ba60d 38 index=0;
titanium 0:f99e355ba60d 39 break;
titanium 0:f99e355ba60d 40 case 0x08:
titanium 0:f99e355ba60d 41 case 0x7f: /*BS and DEL delete the last character*/
titanium 0:f99e355ba60d 42 if (index>0) {
titanium 0:f99e355ba60d 43 index--;
titanium 0:f99e355ba60d 44 this->putc(0x08);
titanium 0:f99e355ba60d 45 this->putc(0x20);
titanium 0:f99e355ba60d 46 this->putc(0x08);
titanium 0:f99e355ba60d 47 }
titanium 0:f99e355ba60d 48 break;
titanium 0:f99e355ba60d 49 default:
titanium 0:f99e355ba60d 50 receiving=2;
titanium 0:f99e355ba60d 51 line[index++]=ch;
titanium 0:f99e355ba60d 52 this->putc(ch);
titanium 0:f99e355ba60d 53 break;
titanium 1:5972dbd390c8 54 } } }
titanium 0:f99e355ba60d 55 public:
titanium 0:f99e355ba60d 56 KBline(PinName tx, PinName rx) : Serial(tx, rx)
titanium 0:f99e355ba60d 57 {
titanium 0:f99e355ba60d 58 receiving=0;
titanium 0:f99e355ba60d 59 }
titanium 0:f99e355ba60d 60 // KBline(Serial *pc) { term=pc; }; //constructor
titanium 0:f99e355ba60d 61 void start_getline()
titanium 0:f99e355ba60d 62 {
titanium 0:f99e355ba60d 63 index=0;
titanium 0:f99e355ba60d 64 receiving=1;
titanium 0:f99e355ba60d 65 this->attach(this, &KBline::serialirq);
titanium 0:f99e355ba60d 66 }
titanium 0:f99e355ba60d 67 // int receiving() { return(receiving);}
titanium 0:f99e355ba60d 68 char *getline()
titanium 0:f99e355ba60d 69 {
titanium 0:f99e355ba60d 70 while (receiving!=3) wait(0.1);
titanium 0:f99e355ba60d 71 receiving=0;
titanium 0:f99e355ba60d 72 return(line);
titanium 0:f99e355ba60d 73 }
titanium 0:f99e355ba60d 74 } ;
titanium 0:f99e355ba60d 75
titanium 1:5972dbd390c8 76 int newindex(int ix)
titanium 1:5972dbd390c8 77 { if (ix<0) ix += WAVMAX;
titanium 1:5972dbd390c8 78 return(ix % WAVMAX); }
titanium 1:5972dbd390c8 79
titanium 1:5972dbd390c8 80 void voice_io() /*timer driven*/
titanium 1:5972dbd390c8 81 { unsigned short val;
titanium 1:5972dbd390c8 82 wave[readindex]= mic.read_u16(); //mic.read()*30000;
titanium 1:5972dbd390c8 83 val=wave[writeindex];
titanium 1:5972dbd390c8 84 pwm.write((float)val/65536.0);
titanium 1:5972dbd390c8 85 spk.write_u16(val); // (val/30000.0 );
titanium 1:5972dbd390c8 86 readindex=newindex(readindex+1);
titanium 1:5972dbd390c8 87 writeindex=newindex(writeindex+1);
titanium 0:f99e355ba60d 88 }
titanium 0:f99e355ba60d 89
titanium 0:f99e355ba60d 90 int main()
titanium 0:f99e355ba60d 91 {
titanium 0:f99e355ba60d 92 KBline pc(USBTX, USBRX);
titanium 0:f99e355ba60d 93 float delay=DELAY;
titanium 0:f99e355ba60d 94
titanium 0:f99e355ba60d 95 pc.baud(9600);
titanium 1:5972dbd390c8 96 pwm.period_us(32); /* 62.5us*/
titanium 0:f99e355ba60d 97 delay=DELAY;
titanium 0:f99e355ba60d 98 readindex=0;
titanium 1:5972dbd390c8 99 writeindex=newindex(readindex-delay*SAMPFREQ);
titanium 1:5972dbd390c8 100 voicetick.attach(voice_io, 1.0/SAMPFREQ);
titanium 0:f99e355ba60d 101 pc.printf("echo machine delay=%fs\n\r", delay);
titanium 0:f99e355ba60d 102 while (true) {
titanium 0:f99e355ba60d 103 pc.start_getline();
titanium 0:f99e355ba60d 104 while (pc.receiving!=3) {
titanium 0:f99e355ba60d 105 led1 = !led1;
titanium 0:f99e355ba60d 106 wait(0.2);
titanium 0:f99e355ba60d 107 }
titanium 1:5972dbd390c8 108 sscanf(pc.line,"%f", &delay); /* multiple of 0.1s */
titanium 1:5972dbd390c8 109 writeindex=newindex(readindex-delay*SAMPFREQ);
titanium 1:5972dbd390c8 110 pc.printf("new delay %5.2fs r=%d w=%d val=%d\n\r", delay, readindex, writeindex, wave[writeindex]);
titanium 0:f99e355ba60d 111 }
titanium 0:f99e355ba60d 112 }
titanium 0:f99e355ba60d 113