mirror of https://github.com/nealey/proton
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
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#include <Arduino.h>
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#include <SPI.h>
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#include <Adafruit_VS1053.h>
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#include <SD.h>
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#include "MusicPlayer.h"
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MusicPlayer::MusicPlayer(int8_t cs, int8_t dcs, int8_t dreq, int8_t cardcs)
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{
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musicPlayer = new Adafruit_VS1053_FilePlayer(cs, dcs, dreq, cardcs);
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musicPlayer->begin();
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musicPlayer->setVolume(20, 20); // lower = louder
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musicPlayer->sineTest(0x44, 500);
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SD.begin(cardcs);
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}
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void
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MusicPlayer::setVolume(uint8_t left, uint8_t right)
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{
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musicPlayer->setVolume(left, right);
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}
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boolean
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MusicPlayer::startPlayingFile(const char *trackname)
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{
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return musicPlayer->startPlayingFile(trackname);
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}
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void
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MusicPlayer::stopPlaying()
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{
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musicPlayer->stopPlaying();
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}
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void
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MusicPlayer::poll(unsigned long jiffies)
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{
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/* Cleverness ensues
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*
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* The Adafruit library is written to let you go off and do whatever you need,
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* hooking into an interrupt to sort of act like a multitasking operating system,
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* interrupting your program periodically.
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*
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* That's smart, since it makes it easy to use,
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* but we want this to be responsive, and can't handle something barging in and taking up lots of time:
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* it makes things look really uneven as our display code pauses to fill the buffer.
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* Fortunately, we don't have to fill the entire buffer at once, we can trickle data in.
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* That's what this does.
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*
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* Since the entire program is polling, without ever calling delay,
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* and hopefully doing what needs to be done quickly,
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* we check to see if the music chip wants more data.
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* If it does, we give it one chunk, and only one chunk,
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* rather than filling its buffer back up completely.
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*
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* There is still some weirdness with this loop,
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* possibly because the SPI routines are masking interrupts used to increment millis.
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* But it's remarkably more fluid than the other way.
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*/
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if (musicPlayer->playingMusic && musicPlayer->readyForData()) {
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int bytesread = musicPlayer->currentTrack.read(musicPlayer->mp3buffer, VS1053_DATABUFFERLEN);
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if (bytesread == 0) {
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musicPlayer->playingMusic = false;
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musicPlayer->currentTrack.close();
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} else {
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musicPlayer->playData(musicPlayer->mp3buffer, bytesread);
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}
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}
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}
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