I2C EEPROM and audio playback

hi all!
im hitting wall here.
i not sure put post, in audio section ore here. sorry if missed forum section.

anyways, im trying achive store audio sample (wav), convertetd char array variable , store on external eeprom 24lc1024. after that, retrive variable , play on small speaker.

im using pcm.h library playing, or better pwm numbers pin 11 on arduino speaker connected to.

i have 2 sketches. 1 writing eeprom, , other fore retriving , playback.


writing eeprom successfull, however, comping read eeprom sketch gives me error

code: [select]

invalid conversion 'byte {aka unsigned char}' 'unsigned char*' [-fpermissive]


does have clue doing wrong
i know has <pcm> library, accepts pointer variable.
any suggestions other method?
thx!

here code




---------- write.ino

code: [select]



#include <wire.h> //i2c library


  // warning: address page address, 6-bit end wrap around
  // also, data can maximum of 30 bytes, because wire library has buffer of 32 bytes
  void i2c_eeprom_write_page( int deviceaddress, unsigned int eeaddresspage,  unsigned char* data, byte length ) {
    wire.begintransmission(deviceaddress);
    wire.write((int)(eeaddresspage >> 8)); // msb
    wire.write((int)(eeaddresspage & 0xff)); // lsb
    byte c;
    for ( c = 0; c < length; c++)
      wire.write(data[c]);
    wire.endtransmission();
  }

  void setup()
  {
  
    unsigned char somedata[] = {
    126, 127, 128, 128, 128, 128, 128, 127, 128, 128, 128, 129, 129, 128, 127, 128, 128, 127, 126, 127, 128, 129, 128, 127, 126, 127, 128, 128, 126, 126, 127, 127, 127, 127, 127, 127, 126, 127, 129, 130, 129, 128, 126, 126, 126, 126, 127, 129, 130, 129, 127, 127, 127, 127, 128, 128, 128, 128, 127, 127, 127, 127, 127, 127, 128, 130, 131, 129, 127, 126, 126, 126, 127, 127, 128, 128, 128, 128, 127, 128, 128, 127, 127, 128, 128, 130, 130, 129, 126, 125, 127, 129, 130, 129, 128, 126, 125, 126, 129, 131, 131, 127, 123, 125, 129, 131, 130, 128, 129, 130, 130, 129, 127, 127, 128, 130, 129, 128, 126, 125, 126, 129, 131, 130, 128, 128, 128, 126, 125, 126, 128, 129, 128, 125, 125, 127, 129, 129, 129, 129, 127, 124, 123, 125, 128, 128, 126, 125, 125, 127, 129, 127, 126, 127, 128, 129, 129, 127, 124, 121, 123, 127, 130, 130, 128, 124, 122, 123, 127, 130, 131, 129, 125, 122, 122, 126, 128, 128, 128, 125, 123, 121, 118, 114, 111, 112, 113, 112, 109, 106, 107, 112, 117, 115, 111, 108, 109, 111, 112, 115, 116, 115, 112, 109, 107, 110, 114, 116, 115, 116, 117, 118, 118, 118, 117, 116, 115, 113, 110, 109, 111, 111, 111, 111, 114, 116, 115, 112, 110, 111, 113, 113, 110, 108, 110, 115, 117, 116, 114, 114, 114, 114, 113, 112, 113, 116, 116, 116, 116, 118, 119, 120, 121, 123, 124, 123, 119, 114, 112, 115, 118, 120, 122, 123, 123, 119, 116, 118, 124, 131, 130, 122, 116, 117, 123, 128, 132, 133, 131, 126, 121, 117, 117, 120, 124, 125, 123, 120, 118, 120, 125, 129, 128, 124, 120, 116, 115, 118, 123, 126, 125, 121, 117, 116, 118, 121, 122, 121, 120, 119, 121, 125, 126, 123, 119, 120, 126, 129, 125, 119, 116, 116, 118, 120, 124, 128, 127, 122, 119, 122, 128, 128, 123, 119, 120, 120, 119, 119, 124,
    }; // data write

    wire.begin(); // initialise connection
    serial.begin(9600);
    i2c_eeprom_write_page(0x50, 0, (byte *)somedata, sizeof(somedata)); // write eeprom

    delay(10); //add small delay

    serial.println("memory written");
    
    
  }

  void loop(){}






---------- read.ino

code: [select]



 /*
  *  use i2c bus eeprom 24lc64
  *  sketch:    eeprom.pde
  *  
  *  author: hkhijhe
  *  date: 01/10/2010
  *
  *  
  */

  #include <wire.h> //i2c library
#include <pcm.h>

  byte i2c_eeprom_read_byte( int deviceaddress, unsigned int eeaddress ) {
     unsigned char rdata = 0xff;
    wire.begintransmission(deviceaddress);
    wire.write((int)(eeaddress >> 8)); // msb
    wire.write((int)(eeaddress & 0xff)); // lsb
    wire.endtransmission();
    wire.requestfrom(deviceaddress,1);
    if (wire.available()) rdata = wire.read();
    return rdata;
  }
  
  void setup() {}

  void loop()
  {
    
    int addr=0; //first address
    byte b = i2c_eeprom_read_byte(0x50, 0); // access first address memory

    while (b!=0)
    {
      startplayback(b)); //playing sound sample
     // serial.print((byte)b); //print content serial port
      addr++; //increase address
      b = i2c_eeprom_read_byte(0x50, addr); //access address memory
    }
    
    //delay(2000);
      

  }


somewhere use byte, function needs pointer.
turn on line numbers, , have better @ error message. compiler tells @ line number problem is.

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > I2C EEPROM and audio playback

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