Richard Kuo / Mbed OS NTOUEE-mbed-PWM_playnote

mbed PWM play note to a speaker

main.cpp@0:32bc20854e98, 2016-10-20 (annotated)

Committer:
rkuo2000
Date:
Thu Oct 20 12:41:50 2016 +0000
Revision:
0:32bc20854e98
mbed PWM play note to a speaker

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rkuo2000 0:32bc20854e98 1 // using NuMaker-PFM-NUC472 PWM0 output to a speaker
rkuo2000 0:32bc20854e98 2 #include "mbed.h"
rkuo2000 0:32bc20854e98 3
rkuo2000 0:32bc20854e98 4 #define _C5 523 // C5 = 523.25Hz
rkuo2000 0:32bc20854e98 5 #define _D5 587 // D5 = 587.33Hz
rkuo2000 0:32bc20854e98 6 #define _E5 659 // E5 = 659.26Hz
rkuo2000 0:32bc20854e98 7 #define _F5 698 // F5 = 698.46Hz
rkuo2000 0:32bc20854e98 8 #define _G5 784 // G5 = 783.99Hz
rkuo2000 0:32bc20854e98 9 #define _A5 880 // A5 = 880.00Hz
rkuo2000 0:32bc20854e98 10 #define _B5 988 // B5 = 987.77Hz
rkuo2000 0:32bc20854e98 11 #define _C6 1046 // C6 = 1046.50Hz
rkuo2000 0:32bc20854e98 12 #define _D6 1175 // D6 = 1174.66Hz
rkuo2000 0:32bc20854e98 13 #define _E6 1319 // E6 = 1318.51Hz
rkuo2000 0:32bc20854e98 14 #define _F6 1397 // F6 = 1396.91Hz
rkuo2000 0:32bc20854e98 15 #define _G6 1568 // G6 = 1567.98Hz
rkuo2000 0:32bc20854e98 16 #define _A6 1760 // A6 = 1760.00Hz
rkuo2000 0:32bc20854e98 17 #define _B6 1976 // B6 = 1975.53Hz
rkuo2000 0:32bc20854e98 18
rkuo2000 0:32bc20854e98 19 PwmOut pwm0(PF_9); // PWM0 pin
rkuo2000 0:32bc20854e98 20
rkuo2000 0:32bc20854e98 21 int main()
rkuo2000 0:32bc20854e98 22 {
rkuo2000 0:32bc20854e98 23 int i =0;
rkuo2000 0:32bc20854e98 24 int note[15] = { // array of notes
rkuo2000 0:32bc20854e98 25 _C5, _D5, _E5, _F5, _G5, _A5, _B5,
rkuo2000 0:32bc20854e98 26 _C6, _D6, _E6, _F6, _G6, _A6, _B6};
rkuo2000 0:32bc20854e98 27
rkuo2000 0:32bc20854e98 28 for (i=0; i<14; i++) {
rkuo2000 0:32bc20854e98 29 pwm0.period_us(1000000/note[i]); // set period per note
rkuo2000 0:32bc20854e98 30 pwm0.pulsewidth_us(1000000/note[i]/2); // set duty cycle to 50%
rkuo2000 0:32bc20854e98 31 Thread::wait(100);
rkuo2000 0:32bc20854e98 32 }
rkuo2000 0:32bc20854e98 33 pwm0.pulsewidth_us(0); // set dutycycle = 0% to stop
rkuo2000 0:32bc20854e98 34 }