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Cricket (insect) emulation
Fork of talking by
cricket.cpp
- Committer:
- faif
- Date:
- 2017-02-11
- Revision:
- 2:c6c74e788985
- Parent:
- talking.cpp@ 1:91104d67b0af
- Child:
- 3:1b91d910dabd
File content as of revision 2:c6c74e788985:
#include "mbed.h" #include "cricket.h" enum { OFF = 0, ON = 1 }; enum { MaxWavValue = 255 }; static const float ticker_rhythm = 10E-5; // 9.766 kHz sample rate (1/9766 sec delay) static const char clip_path[] = "/local/cricket.wav"; bool done = false; void myrhythm() { done = true; } int main () { const int size = 1165; // 32K max in total (~30K is enough for testing) char clip[size]; waitForButton(led, button); preloadFile(clip, size, clip_path); rhythm.attach(&myrhythm, ticker_rhythm); while (true) { playSound(clip, size, headphones); randomPause(); } } void waitForButton(DigitalOut& led, DigitalIn& button) { led = ON; while (!button) {}; led = OFF; } void preloadFile(char* clip, int size, const char* path) { FILE* file = fopen(path, "r"); for (int i = 0; i != size; ++i) { clip[i] = fgetc(file); } fclose(file); } void playSound(char* clip, int size, AnalogOut& headphones) { for (int i= 0; i != size; ++i) { while (!done) {}; done = false; headphones = float(clip[i]) / MaxWavValue; } } void randomPause() { float c = rand() % 100; // 30% percentage to wait 2 sec if (c > 70) { wait(2); } // 70% percentage to wait 0-1 sec else { wait(c / 100); } }