Sakis Kasampalis / Mbed 2 deprecated cricket

Cricket (insect) emulation

Dependencies:   mbed

Fork of talking by Sakis Kasampalis

cricket.cpp@3:1b91d910dabd, 2017-02-11 (annotated)

Committer:
faif
Date:
Sat Feb 11 15:49:06 2017 +0000
Revision:
3:1b91d910dabd
Parent:
2:c6c74e788985 
Reorganize code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
faif 0:17458f91a0e9 1 #include "mbed.h"
faif 2:c6c74e788985 2 #include "cricket.h"
faif 0:17458f91a0e9 3
faif 0:17458f91a0e9 4 enum
faif 0:17458f91a0e9 5 {
faif 0:17458f91a0e9 6 OFF = 0,
faif 0:17458f91a0e9 7 ON = 1
faif 0:17458f91a0e9 8 };
faif 0:17458f91a0e9 9
faif 0:17458f91a0e9 10 enum { MaxWavValue = 255 };
faif 0:17458f91a0e9 11
faif 2:c6c74e788985 12 static const float ticker_rhythm = 10E-5; // 9.766 kHz sample rate (1/9766 sec delay)
faif 2:c6c74e788985 13 static const char clip_path[] = "/local/cricket.wav";
faif 0:17458f91a0e9 14
faif 0:17458f91a0e9 15 int main ()
faif 0:17458f91a0e9 16 {
faif 2:c6c74e788985 17 const int size = 1165; // 32K max in total (~30K is enough for testing)
faif 0:17458f91a0e9 18 char clip[size];
faif 0:17458f91a0e9 19
faif 0:17458f91a0e9 20 waitForButton(led, button);
faif 0:17458f91a0e9 21 preloadFile(clip, size, clip_path);
faif 0:17458f91a0e9 22
faif 0:17458f91a0e9 23 rhythm.attach(&myrhythm, ticker_rhythm);
faif 0:17458f91a0e9 24
faif 0:17458f91a0e9 25 while (true)
faif 0:17458f91a0e9 26 {
faif 0:17458f91a0e9 27 playSound(clip, size, headphones);
faif 2:c6c74e788985 28 randomPause();
faif 0:17458f91a0e9 29 }
faif 0:17458f91a0e9 30 }
faif 0:17458f91a0e9 31
faif 3:1b91d910dabd 32 bool done = false;
faif 3:1b91d910dabd 33
faif 3:1b91d910dabd 34 void myrhythm()
faif 3:1b91d910dabd 35 {
faif 3:1b91d910dabd 36 done = true;
faif 3:1b91d910dabd 37 }
faif 3:1b91d910dabd 38
faif 0:17458f91a0e9 39 void waitForButton(DigitalOut& led, DigitalIn& button)
faif 0:17458f91a0e9 40 {
faif 0:17458f91a0e9 41 led = ON;
faif 0:17458f91a0e9 42 while (!button) {};
faif 0:17458f91a0e9 43 led = OFF;
faif 0:17458f91a0e9 44 }
faif 0:17458f91a0e9 45
faif 0:17458f91a0e9 46 void preloadFile(char* clip, int size, const char* path)
faif 0:17458f91a0e9 47 {
faif 0:17458f91a0e9 48 FILE* file = fopen(path, "r");
faif 0:17458f91a0e9 49 for (int i = 0; i != size; ++i)
faif 2:c6c74e788985 50 {
faif 0:17458f91a0e9 51 clip[i] = fgetc(file);
faif 2:c6c74e788985 52 }
faif 0:17458f91a0e9 53 fclose(file);
faif 0:17458f91a0e9 54 }
faif 0:17458f91a0e9 55
faif 0:17458f91a0e9 56 void playSound(char* clip, int size, AnalogOut& headphones)
faif 0:17458f91a0e9 57 {
faif 0:17458f91a0e9 58 for (int i= 0; i != size; ++i)
faif 0:17458f91a0e9 59 {
faif 0:17458f91a0e9 60 while (!done) {};
faif 0:17458f91a0e9 61 done = false;
faif 0:17458f91a0e9 62 headphones = float(clip[i]) / MaxWavValue;
faif 0:17458f91a0e9 63 }
faif 0:17458f91a0e9 64 }
faif 2:c6c74e788985 65
faif 2:c6c74e788985 66 void randomPause()
faif 2:c6c74e788985 67 {
faif 2:c6c74e788985 68 float c = rand() % 100;
faif 3:1b91d910dabd 69 // 30% chance to wait 2 sec
faif 2:c6c74e788985 70 if (c > 70)
faif 2:c6c74e788985 71 {
faif 2:c6c74e788985 72 wait(2);
faif 2:c6c74e788985 73 }
faif 3:1b91d910dabd 74 // 70% chance to wait 0-1 sec
faif 2:c6c74e788985 75 else
faif 2:c6c74e788985 76 {
faif 2:c6c74e788985 77 wait(c / 100);
faif 2:c6c74e788985 78 }
faif 2:c6c74e788985 79 }