This is the code that I use to receive a CAN message with the Seeedstudio CAN bus shield, have it translated to a .mp3 filename and have it then played by the Adafruit VS1053. This code is a collection from both demos. The code is not finished and may contain errors, because it is not working properly.
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// UNO...13 werkt als simpele MP3 shield; alleen drukknop op PIN6 om file af te spelen.
// demo: CAN-BUS Shield, send data
// 14a blijft in de verkeerde LOOP hangen, maar 14 deed het nog wel gewoon, zonder CAN shield.
/***************************************************
This is an example for the Adafruit VS1053 Codec Breakout
Designed specifically to work with the Adafruit VS1053 Codec Breakout
----> https://www.adafruit.com/products/1381
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/
// include SPI, MP3 and SD libraries
#include <mcp_can.h>
#include <SPI.h>
#include <Adafruit_VS1053.h>
#include <SD.h>
#include <stdio.h>
// define the pins used
//#define CLK 13 // SPI Clock, shared with SD card DE CONNECTOR PINNEN MOETEN WEL INGESTOKEN BLIJVEN
//#define MISO 12 // Input data, from VS1053/SD card DE CONNECTOR PINNEN MOETEN WEL INGESTOKEN BLIJVEN
//#define MOSI 11 // Output data, to VS1053/SD card DE CONNECTOR PINNEN MOETEN WEL INGESTOKEN BLIJVEN
#define RESET 9 // VS1053 reset pin (output)
#define CS 10 // VS1053 chip select pin (output)
#define DCS 8 // VS1053 Data/command select pin (output)
#define DREQ 3 // VS1053 Data request pin (into Arduino)
#define CARDCS 4 // Card chip select pin
// hierna overgenomen uit de CAN demo file:
#define INT8U unsigned char
INT8U Flag_Recv = 0;
INT8U len = 0;
INT8U buf[8];
INT32U canId = 0x000;
Adafruit_VS1053_FilePlayer musicPlayer = Adafruit_VS1053_FilePlayer(RESET, CS, DCS, DREQ, CARDCS);
// Alternately, use 'soft SPI'. Requires Adafruit's flexible SD library
// Adafruit_VS1053_FilePlayer musicPlayer = Adafruit_VS1053_FilePlayer(MOSI, MISO, CLK, RESET, CS, DCS, DREQ, CARDCS);
const int buttonPin = 6; // the number of the pushbutton pin
int buttonState = 0; // variable for reading the pushbutton status
int previousButtonState = 0; // om op de flank te kunnen schakelen
String deel1, deel2, deel3, filenaam;
char muzieknaam[14];
void setup() {
// EERST de CAN BUS SET UP IN PLAKKEN:
Serial.begin(115200); // init can bus, baudrate: 100k
if(CAN.begin(CAN_100KBPS) ==CAN_OK) Serial.print("can init ok!!\r\n");
else Serial.print("Can init fail!!\r\n");
attachInterrupt(0, MCP2515_ISR, FALLING); //start interrupt, werkt via pin=2(PWM) VRIJ LATEN
// HIERNA de MP3 STUKKEN:
// initialize the pushbutton pin as an input:
// pinMode(buttonPin, INPUT);
pinMode(buttonPin, INPUT_PULLUP); // set pin to input
deel1 = String("track0");
deel3 = String(".mp3");
filenaam = "trackleeg"; // zo wordt straks de bestandsnaaam opgebouwd.
Serial.begin(9600);
delay(1000);
Serial.println("Adafruit VS1053 Library Test");
// initialise the music player
if (!musicPlayer.begin()) {
Serial.println("VS1053 not found");
while (1); // don't do anything more
}
musicPlayer.sineTest(0x44, 500); // Make a tone to indicate VS1053 is working
if (!SD.begin(CARDCS)) {
Serial.println("SD failed, or not present");
while (1); // don't do anything more
}
Serial.println("SD OK!");
// Set volume for left, right channels. lower numbers == louder volume!
musicPlayer.setVolume(20,20);
/***** Two interrupt options! *******/
// This option uses timer0, this means timer1 & t2 are not required
// (so you can use 'em for Servos, etc) BUT millis() can lose time
// since we're hitchhiking on top of the millis() tracker
//musicPlayer.useInterrupt(VS1053_FILEPLAYER_TIMER0_INT);
// This option uses a pin interrupt. No timers required! But DREQ
// must be on an interrupt pin. For Uno/Duemilanove/Diecimilla
// that's Digital #2 or #3
// See http://arduino.cc/en/Reference/attachInterrupt for other pins
// *** This method is preferred
if (! musicPlayer.useInterrupt(VS1053_FILEPLAYER_PIN_INT))
Serial.println("DREQ pin is not an interrupt pin");
Serial.println("nu GING GONG afspelen");
musicPlayer.playFullFile("track003.mp3"); //gong en gong back. ARDUINO WACHT tot het is afgelopen. Knoppendrukken heeft nu geen zin.
}
// INTERRUPT afloop van de CAN bus MEDEDELING HIER:
void MCP2515_ISR()
{
Flag_Recv = 1;
}
void loop() {
delay(50); // zonder delay, is de bus accuut 95% belast. Met deze delay(50) nog maar 3%
// Alternately, we can just play an entire file at once
// This doesn't happen in the background, instead, the entire
// file is played and the program will continue when it's done!
// musicPlayer.playFullFile("track002.mp3");
// Start playing a file, then we can do stuff while waiting for it to finish
// if (! musicPlayer.startPlayingFile("track001.mp3")) //frog
// {
// Serial.print("Could not open file");
// return;
// }
if(Flag_Recv) // check if data was received
{
Flag_Recv = 0; //clear flag
CAN.readMsgBuf(&len, buf); // read data, len= DLC= DataLengthChar, buf: data
canId = CAN.getCanId();
Serial.print(len);
Serial.print(" en de data is: ");
for (int i = 0; i < len; i ++) // print to show and check
{
Serial.print(buf[i]);
Serial.print(" ");
}
Serial.print("CAN ID = ");
Serial.println(canId);
deel2 = String(buf[0], DEC);
filenaam = deel1 + deel2 + deel3;
filenaam.toCharArray(muzieknaam, sizeof(muzieknaam));
musicPlayer.startPlayingFile(muzieknaam);
// if (buf[0] == 11) // TEST dan is deboodschap voor de MP3 bestemd
// {
// musicPlayer.startPlayingFile("track011.mp3");
// }
}
Serial.println(","); // begonnen met knop af te tasten
// File is playing in the background
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == LOW)
{
if (previousButtonState == HIGH)
{
previousButtonState = LOW;
musicPlayer.startPlayingFile("track001.mp3");
}
}
else
{ // buttonState is dus HIGH
if (previousButtonState == LOW) {previousButtonState = HIGH;}
}
while (musicPlayer.playingMusic) {
// file is now playing in the 'background' so now's a good time
// to do something else like handling LEDs or buttons :)
// Serial.print(".");
delay(100);
}
// Serial.println("Done playing music");
}
--paul—
