52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
|
#include "pxt.h"
|
||
|
|
#include "ev3.h"
|
||
|
|
|
||
|
|
#define NOTE_PAUSE 20
|
||
|
|
|
||
|
|
namespace music {
|
||
|
|
|
||
|
|
byte currVolume = 100;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Set the output volume of the sound synthesizer.
|
||
|
|
* @param volume the volume 0...256, eg: 128
|
||
|
|
*/
|
||
|
|
//% weight=96
|
||
|
|
//% blockId=synth_set_volume block="set volume %volume"
|
||
|
|
//% parts="speaker" blockGap=8
|
||
|
|
//% volume.min=0 volume.max=256
|
||
|
|
//% help=music/set-volume
|
||
|
|
//% weight=1
|
||
|
|
void setVolume(int volume) {
|
||
|
|
currVolume = max(0, min(100, volume * 100 / 256));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Play a tone through the speaker for some amount of time.
|
||
|
|
* @param frequency pitch of the tone to play in Hertz (Hz)
|
||
|
|
* @param ms tone duration in milliseconds (ms)
|
||
|
|
*/
|
||
|
|
//% help=music/play-tone weight=90
|
||
|
|
//% blockId=music_play_note block="play tone|at %note=device_note|for %duration=device_beat"
|
||
|
|
//% parts="headphone" async blockGap=8
|
||
|
|
//% blockNamespace=music
|
||
|
|
void playTone(int frequency, int ms) {
|
||
|
|
if (frequency <= 0) {
|
||
|
|
StopSound();
|
||
|
|
if (ms >= 0)
|
||
|
|
sleep_ms(ms);
|
||
|
|
} else {
|
||
|
|
if (ms > 0) {
|
||
|
|
int d = max(1, ms - NOTE_PAUSE); // allow for short rest
|
||
|
|
int r = max(1, ms - d);
|
||
|
|
PlayToneEx(frequency, d, currVolume);
|
||
|
|
sleep_ms(d + r);
|
||
|
|
} else {
|
||
|
|
// ring
|
||
|
|
PlayToneEx(frequency, 60000, currVolume);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
sleep_ms(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|