PT2258/PT2258.cpp at master · apple596/PT2258 · GitHub

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/* Arduino PT2258 Library
 *
 * This file is part of the Arduino PT2258 Library
 *
 */

#include <arduino.h>
#include <wire.h>
#include <PT2258.h>

unsigned char channell_address01[6] =
  {CHANNEL1_VOLUME_STEP_01, CHANNEL2_VOLUME_STEP_01, CHANNEL3_VOLUME_STEP_01,
   CHANNEL4_VOLUME_STEP_01, CHANNEL5_VOLUME_STEP_01, CHANNEL6_VOLUME_STEP_01};

unsigned char channell_address10[6] =
  {CHANNEL1_VOLUME_STEP_10, CHANNEL2_VOLUME_STEP_10, CHANNEL3_VOLUME_STEP_10,
   CHANNEL4_VOLUME_STEP_10, CHANNEL5_VOLUME_STEP_10, CHANNEL6_VOLUME_STEP_10};

// helper method
unsigned char PT2258::HEX2BCD (unsigned char x)
{
    unsigned char y;
    y = (x / 10) << 4;
    y = y | (x % 10);
    return (y);
}

// helper method
int PT2258::writeI2CChar(unsigned char c)
{
//  shift address to right - Wire library always uses 7 bit addressing
    Wire.beginTransmission(0x88 >> 1); // transmit to device 0x88, PT2258
    Wire.write(c);
    int rtnCode = Wire.endTransmission(); // stop transmitting
    return rtnCode;
}

// initialize PT2258
int PT2258::init(void)
{
    delay(300); // in case this is first time - I2C bus not ready for this long on power on with 10uF cref

    unsigned char masterVolumeValue = 0x00;    //master volume 0dB
    unsigned char channelVolume = 0x00;   // channel volume 0dB

    // initialize device
    writeI2CChar(SYSTEM_RESET);

    // set channell volumes to zero
    for(int chno=0; chno<6; chno++){
      Wire.beginTransmission(0x88 >> 1); // transmit to device 0x88, PT2258
      Wire.write(channell_address01[chno] | (HEX2BCD(channelVolume)   &  0x0f));
      Wire.write(channell_address10[chno] | ((HEX2BCD(channelVolume)  &  0xf0)>>4));
      Wire.endTransmission();       // stop transmitting
    }

    // set the master voume
    Wire.beginTransmission(0x88 >> 1); // transmit to device 0x88, PT2258
    Wire.write(MASTER_VOLUME_1STEP | (HEX2BCD(masterVolumeValue)  &  0x0f));
    Wire.write(MASTER_VOLUME_10STEP | ((HEX2BCD(masterVolumeValue)  &  0xf0)>>4));
    Wire.endTransmission();       // stop transmitting

    // set mute off
    return writeI2CChar(MUTE | 0x00);
}

// Set mute: 1 -> mute on, 0 -> mute off
void PT2258::setMute(char in_mute)
{
  writeI2CChar(MUTE | in_mute);
}

// Set channel volume, attenuation range : 0 to 79dB
void PT2258::setChannelVolume(unsigned char chvol, char chno)
{
  Wire.beginTransmission(0x88 >> 1); // transmit to device 0x88, PT2258
  Wire.write(channell_address01[chno] | (HEX2BCD(chvol)   &  0x0f));
  Wire.write(channell_address10[chno] | ((HEX2BCD(chvol)  &  0xf0)>>4));
  Wire.endTransmission();       // stop transmitting
}

// Set master volume, attenuation range : 0 to 79dB
void PT2258::setMasterVolume(unsigned char mvol)
{
  Wire.beginTransmission(0x88 >> 1); // transmit to device 0x88, PT2258
  Wire.write(MASTER_VOLUME_1STEP  | (HEX2BCD(mvol)   &  0x0f));
  Wire.write(MASTER_VOLUME_10STEP | ((HEX2BCD(mvol)  &  0xf0)>>4));
  Wire.endTransmission();       // stop transmitting
}