File content as of revision 3:0da61b470b86:

#include "Adafruit_IS31FL3731.h"
#include "Adafruit_GFX.h"
#ifndef _swap_int16_t
#define _swap_int16_t(a, b) { int16_t t = a; a = b; b = t; }
#endif

bool Adafruit_IS31FL3731::begin(uint8_t addr) {

  _i2caddr = addr;
  _frame = 0;

  // shutdown
  writeRegister8(ISSI_BANK_FUNCTIONREG, ISSI_REG_SHUTDOWN, 0x00);

  //delay(10);
  wait(0.01);


  // out of shutdown
  writeRegister8(ISSI_BANK_FUNCTIONREG, ISSI_REG_SHUTDOWN, 0x01);

  // picture mode
  writeRegister8(ISSI_BANK_FUNCTIONREG, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE);

  displayFrame(_frame);

  // all LEDs on & 0 PWM
  clear(); // set each led to 0 PWM

  for (uint8_t f=0; f<8; f++) {  
    for (uint8_t i=0; i<=0x11; i++)
      writeRegister8(f, i, 0xff);     // each 8 LEDs on
  }

  audioSync(false);

  return true;
}

void Adafruit_IS31FL3731::clear(void) {
  // all LEDs on & 0 PWM

  selectBank(_frame);
  
  uint8_t nemo[24] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

  for (uint8_t i=0; i<6; i++) {
    // write 24 bytes at once
    myI2C->writeBytes(_i2caddr, 0x24+i*24, 24, nemo);
  }
}

void Adafruit_IS31FL3731::setLEDPWM(uint8_t lednum, uint8_t pwm, uint8_t bank) {
  if (lednum >= 144) return;
  writeRegister8(bank, 0x24+lednum, pwm);
}


void Adafruit_IS31FL3731_Wing::drawPixel(int16_t x, int16_t y, uint16_t color) {
  switch (getRotation()) {
  case 1:
    _swap_int16_t(x, y);
    x = 15 - x - 1;
    break;
  case 2:
    x = 15 - x - 1;
    y = 7 - y - 1;
    break;
  case 3:
    _swap_int16_t(x, y);
    y = 9 - y - 1;
    break;
  }

  // charlie wing is smaller:
  if ((x < 0) || (x >= 16) || (y < 0) || (y >= 7)) return;

  if (x > 7) {
    x=15-x;
    y += 8;
  } else {
    y = 7-y;
  }

  _swap_int16_t(x, y);
 
  if (color > 255) color = 255; // PWM 8bit max

  setLEDPWM(x + y*16, color, _frame);
  return;
}



void Adafruit_IS31FL3731::drawPixel(int16_t x, int16_t y, uint16_t color) {
 // check rotation, move pixel around if necessary
  switch (getRotation()) {
  case 1:
    _swap_int16_t(x, y);
    x = 16 - x - 1;
    break;
  case 2:
    x = 16 - x - 1;
    y = 9 - y - 1;
    break;
  case 3:
    _swap_int16_t(x, y);
    y = 9 - y - 1;
    break;
  }

  if ((x < 0) || (x >= 16)) return;
  if ((y < 0) || (y >= 9)) return;
  if (color > 255) color = 255; // PWM 8bit max

  setLEDPWM(x + y*16, color, _frame);
  return;
}

void Adafruit_IS31FL3731::setFrame(uint8_t f) {
  _frame = f;
}

void Adafruit_IS31FL3731::displayFrame(uint8_t f) {
  if (f > 7) f = 0;
  writeRegister8(ISSI_BANK_FUNCTIONREG, ISSI_REG_PICTUREFRAME, f);
}


void Adafruit_IS31FL3731::selectBank(uint8_t b) {
 myI2C->writeByte(_i2caddr, ISSI_COMMANDREGISTER, b);
}

void Adafruit_IS31FL3731::audioSync(bool sync) {
  if (sync) {
    writeRegister8(ISSI_BANK_FUNCTIONREG, ISSI_REG_AUDIOSYNC, 0x1);
  } else {
    writeRegister8(ISSI_BANK_FUNCTIONREG, ISSI_REG_AUDIOSYNC, 0x0);
  }
}

/*************/
void Adafruit_IS31FL3731::writeRegister8(uint8_t b, uint8_t reg, uint8_t data) {
  selectBank(b);
  
   myI2C->writeByte(_i2caddr, reg, data);
}

uint8_t  Adafruit_IS31FL3731::readRegister8(uint8_t bank, uint8_t reg) {
 uint8_t x;
 //uint8_t status;

 selectBank(bank);

 //status =  
 myI2C->readByte(_i2caddr, reg, &x);

  return x;
}