So I've bought a few of these MP3 modules from MDFLY.com intending to embed them in a couple of projects.
SD Card MP3 Player Module RS232-TTL - MDFLY
Manual attached, just 2 pages.
And I've written this sketch to read a keypad, and send a number to the module to play a file.
I made a bunch of short files that are just the word "zero", "one", "two", etc. up to "nine" and "invalid".
I have a MAX7219 with bubble display to show some status.
Rx/Tx go the module, not reading anything back yet (not sure if anything even comes back).
Got my control code figured out - but I can't get this thing to play the files I want.
I send it 1,01, 0x01, it plays file 008.mp3.
I send it 2, 02, 0x02, it plays file 009.mp3
I send it 3, 03, 0x03, it plays file 001.pm3
I send it A, it plays 008.mp3.
Have I got something really wrong here?
// test code for playing MP3s from MDFLY SD card module
// use MAX7219 to drive 7-segment display
// 12 button keypad like on a touchtone phone
// * and # to do what?
// files will be dialtone, 0-9, *, #, and 20 to 199
// display: 3 digits
#include <SPI.h>
#include <Keypad.h>
byte ssPin = 10; // MAX7219 slave select
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
{
'1','2','3','A' }
,
{
'4','5','6','B' }
,
{
'7','8','9','C' }
,
{
'*','0','#','D' }
,
};
// A,B,C,D,*,# not used
byte rowPins[ROWS] = {
2,3,4,5}; //row pins
byte colPins[COLS] = {
6,7,8,9}; //column pins
// column 9 goes away with 12 button?
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
byte busyPin = 14;
byte stopped = 0;
byte playing = 1;
byte paused = 2;
byte playState = stopped; // stopped, playing, paused
byte songUpper = 0;
byte songMiddle = 0;
byte songLower = 1;
byte song = 1;
byte blank = 10;
byte P = 11;
byte L = 12;
byte A = 13;
byte Y = 14;
byte U = 15;
byte S = 16;
byte E = 17;
byte Q = 18;
byte T = 19;
byte O = 20;
byte commandArray[] = {
S,T,O,P,blank,};
byte fontArray[] = {
// D7-6-5-4-3-2-1-0 = DP-A-B-C-D-E-F-G
0b01111110, // 0
0b00110000, // 1
0b01101101, // 2
0b01111001, // 3
0b00110011, // 4
0b01011011, // 5
0b01011111, // 6
0b01110000, // 7
0b01111111, // 8
0b01111011, // 9
0b00000000, // 10 blank
};
unsigned long currentMillis;
unsigned long buttonPressTime;
unsigned long elapsedButtonTime;
unsigned long displayOnTime = 30000; // 30 seconds
byte decrement = 0;
byte Apressed = 0;
// ***********************************
void setup(){
pinMode (busyPin, INPUT_PULLUP);
pinMode (ssPin, OUTPUT);
SPI.begin();
// MAX7219 setup:
// shutdown mode
digitalWrite (ssPin, LOW);
SPI.transfer(0x0C);
SPI.transfer(0);
digitalWrite (ssPin, HIGH);
// 8 digits
digitalWrite (ssPin, LOW);
SPI.transfer(0x0B);
SPI.transfer(0x07);
digitalWrite (ssPin, HIGH);
// no decode mode
digitalWrite (ssPin, LOW);
SPI.transfer(0x09);
SPI.transfer(0);
digitalWrite (ssPin, HIGH);
// display test off
digitalWrite (ssPin, LOW);
SPI.transfer(0x0F);
SPI.transfer(0);
digitalWrite (ssPin, HIGH);
// intensity
digitalWrite (ssPin, LOW);
SPI.transfer(0x0A);
SPI.transfer(7); // 1/2 bright
digitalWrite (ssPin, HIGH);
// all done, normal mode
digitalWrite (ssPin, LOW);
SPI.transfer(0x0C);
SPI.transfer(1);
digitalWrite (ssPin, HIGH);
// display song & PLAY
digitalWrite (ssPin, LOW);
SPI.transfer(8); // address
SPI.transfer(fontArray[songUpper]);
digitalWrite (ssPin, HIGH);
digitalWrite (ssPin, LOW);
SPI.transfer(7); // address
SPI.transfer(fontArray[songMiddle]);
digitalWrite (ssPin, HIGH);
digitalWrite (ssPin, LOW);
SPI.transfer(6); // address
SPI.transfer(fontArray[songLower]);
digitalWrite (ssPin, HIGH);
Serial.begin(4800);
} // end setup
void loop(){
char key = keypad.getKey();
if (key != NO_KEY){
// for debug:
//Serial.println(key);
// buttonPressTime = currentMillis;
// if display was off, turn it on
// normal mode
digitalWrite (ssPin, LOW);
SPI.transfer(0x0C);
SPI.transfer(1);
digitalWrite (ssPin, HIGH);
// act on key press
switch(key){
case '0':
// move data across 'screen'
songUpper = songMiddle;
songMiddle = songLower;
songLower = 0;
// send data to 'screen'
digitalWrite (ssPin, LOW);
SPI.transfer(8); // address
SPI.transfer(fontArray[songLower]);
digitalWrite (ssPin, HIGH);
digitalWrite (ssPin, LOW);
SPI.transfer(7); // address
SPI.transfer(fontArray[songMiddle]);
digitalWrite (ssPin, HIGH);
digitalWrite (ssPin, LOW);
SPI.transfer(6); // address
SPI.transfer(fontArray[songUpper]);
digitalWrite (ssPin, HIGH);
// send number file
Serial.write(A); // 1010
//Serial.println ("Case 0");
delay(100);
break;
case '1':
// move data across 'screen'
songUpper = songMiddle;
songMiddle = songLower;
songLower = 1;
// send data to 'screen'
//(same as above, deleted for brevity here)
// send number file
Serial.write( 1); // 0001
//Serial.println ("Case 1");
delay(100);
break;
// cases 2-3-4-5-6--8 deleted for brevity here - 9000 char limit!
case '9':
// move data across 'screen'
songUpper = songMiddle;
songMiddle = songLower;
songLower = 9;
// send data to 'screen'
//(same as above, deleted for brevity here) - can see a need for a function call!
// send number file
Serial.write(9); // 1001
//Serial.println ("Case 9");
delay(100);
break;
Serial.write(11); // should be "invalid" message
} // end switch:case for keypad entry
} // end key check
} // end loop
MP3 Module.pdf (83.1 KB)
