/*
  超小型グラフィックＬＣＤ AQM1248 と
   3軸加速度センサー KXM52-1050　を用いて
   8×8の四角を画面でバウンドさせる
*/

sbit _cs   at RC6_bit;
sbit _rs   at RB5_bit;
#define AN5  0x15                  // X軸
#define AN6  0x19                  // Y軸

void writeCommand(unsigned short cmd)
{
  _cs = 0;
  _rs = 0;
  SPI1_Write(cmd);
  _cs = 1;
}

// Set the display RAM display start line
void startLineSet(unsigned short address)
{
  writeCommand(0x40 | address);
}

// Set the display RAM page address
void pageAddressSet(unsigned short address)
{
  writeCommand(0xB0 | address&7);
}

void colAddressSet(unsigned short address)
{
  unsigned short upper = address>>4;
  unsigned short lower = address & 0x0f;
  writeCommand(0x10 | upper);
  writeCommand(0x00 | lower);
}

void writeData(unsigned short dat)
{
  _cs = 0;
  _rs = 1;
  SPI1_Write(dat);
  _cs = 1;
}

void clear()
{
  int i,j;
  for(i=0; i<8; i++)
  {
    pageAddressSet(i);
    colAddressSet(0);
    for(j=0; j<128; j++)
    writeData(0);
  }
}

void init()
{
  writeCommand(0xAE);   // Display Off
  writeCommand(0xA0);   // ADC normal
  writeCommand(0xC8);   // Common output = reverse/normal 0xC0
  writeCommand(0xA3);   // bias = 1/7
  // 内部レギュレータを順番にONする
  writeCommand(0x2C);   // power control 1
  Delay_ms(2);
  writeCommand(0x2E);   // power control 2
  Delay_ms(2);
  writeCommand(0x2F);   // power control 3
  // コントラスト設定
  writeCommand(0x23);   // Vo voltage resistor retio set
  writeCommand(0x81);   // Electric volume mode set
  writeCommand(0x1C);   // Electric volume value set
  // 表示設定
  writeCommand(0xA4);   // display all point = normal(全点灯しない)
  writeCommand(0x40);   // display start line = 0
  writeCommand(0xA6);   // Display normal/reverse = normal(白黒反転しない)
  writeCommand(0xAF);   // Display ON
}

void main() {
  int i, j, x, y, tmp;
  unsigned int high;
  float xx, yy, coef;
  int direction=0;
  char buff[10];
  OSCCON = 0x75;          // 内部OSC8MHzで動作させる
  TRISB5_bit = 0;         // を出力に設定する
  TRISC6_bit = 0;         // を出力に設定する
  ANSELH  = 0x06;         // ans11(RB5), ans8(RC6)=0 :　digital IO

  /****************************************/
  OPTION_REG = 0;
  WPUA4_bit = 0;              // analog pull-upはしない
  SPI1_Init();      /*master mode
                    clock Fosc/4
                    clock idle state low
                    data transimtted on low to high edge
                    input data sampled at the middle of interval
                    */
  init();
  clear();
  pageAddressSet(5);
  colAddressSet(0);
  startLineSet(0);
  coef = 3.3/256;
  x=0;

  while(1) {
    ADCON0 = AN5;              // X軸
    GO_NOT_DONE_bit = 1;
    while(GO_NOT_DONE_bit);
    high = ADRESH;
    tmp= (int)high-127;
    xx = tmp*coef*100;
    ADCON0 = AN6;              // Y軸
    GO_NOT_DONE_bit = 1;
    while(GO_NOT_DONE_bit);
    high = ADRESH;
    tmp= (int)high-127;
    yy = tmp*coef*100;
    colAddressSet(x);
    if(xx<-0.1 || 0.1<xx)
    {
      direction = xx>0;
      if(!direction) writeData(0);
      for(j=0; j<8; j++) writeData(0xff);
      if(direction) writeData(0);
      if(!direction) x++;
      else x--;
      if(x>120) x = 120;      // 壁にぶつかった時の処理
      if(x<=0)  x = 0;
    }
    if(yy<-0.1 || 0.1<yy)
    {
      if(yy>0) startLineSet(y++);
      else startLineSet(y--);
      if(y>40) y=40;          // 壁にぶつかった時の処理
      if(y<1)  y=1;
    }
    Delay_ms(10);
  }
}

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