Exemple #1
0
// copy frame buffer to graphic buffer on display
void RrdGlcd::fillGDRAM(const uint8_t *bitmap) {
    unsigned char i, y;
    for ( i = 0 ; i < 2 ; i++ ) {
        ST7920_CS();
        for ( y = 0 ; y < PAGE_HEIGHT ; y++ ) {
            ST7920_SET_CMD();
            ST7920_WRITE_BYTE(0x80 | y);
            if ( i == 0 ) {
                ST7920_WRITE_BYTE(0x80);
            } else {
                ST7920_WRITE_BYTE(0x80 | 0x08);
            }
            ST7920_SET_DAT();
            ST7920_WRITE_BYTES(bitmap, WIDTH/8); // bitmap gets incremented in this macro
        }
        ST7920_NCS();
    }
}
Exemple #2
0
void RrdGlcd::initDisplay() {
    if(fb == NULL) return;
    ST7920_CS();
    clearScreen();  // clear framebuffer
    wait_ms(90);                 //initial delay for boot up
    ST7920_SET_CMD();
    ST7920_WRITE_BYTE(0x08);       //display off, cursor+blink off
    ST7920_WRITE_BYTE(0x01);       //clear CGRAM ram
    wait_ms(10);                 //delay for cgram clear
    ST7920_WRITE_BYTE(0x3E);       //extended mode + gdram active
    for(int y=0;y<HEIGHT/2;y++)        //clear GDRAM
    {
        ST7920_WRITE_BYTE(0x80|y);   //set y
        ST7920_WRITE_BYTE(0x80);     //set x = 0
        ST7920_SET_DAT();
        for(int i=0;i<2*WIDTH/8;i++)     //2x width clears both segments
            ST7920_WRITE_BYTE(0);
        ST7920_SET_CMD();
    }
    ST7920_WRITE_BYTE(0x0C); //display on, cursor+blink off
    ST7920_NCS();
    inited= true;
}
uint8_t u8g_dev_rrd_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg) {
  uint8_t i, y;
  switch (msg) {
    case U8G_DEV_MSG_INIT: {
      OUT_WRITE(ST7920_CS_PIN, LOW);
      OUT_WRITE(ST7920_DAT_PIN, LOW);
      OUT_WRITE(ST7920_CLK_PIN, HIGH);

      ST7920_CS();
      u8g_Delay(120);                 //initial delay for boot up
      ST7920_SET_CMD();
      ST7920_WRITE_BYTE(0x20);       //non-extended mode
      ST7920_WRITE_BYTE(0x08);       //display off, cursor+blink off
      ST7920_WRITE_BYTE(0x01);       //clear DDRAM ram
      u8g_Delay(15);                    //delay for DDRAM clear
      ST7920_WRITE_BYTE(0x24);       //extended mode
      ST7920_WRITE_BYTE(0x26);       //extended mode + GDRAM active
      for (y = 0; y < (LCD_PIXEL_HEIGHT) / 2; y++) { //clear GDRAM
        ST7920_WRITE_BYTE(0x80 | y); //set y
        ST7920_WRITE_BYTE(0x80);     //set x = 0
        ST7920_SET_DAT();
        for (i = 0; i < 2 * (LCD_PIXEL_WIDTH) / 8; i++) //2x width clears both segments
          ST7920_WRITE_BYTE(0);
        ST7920_SET_CMD();
      }
      ST7920_WRITE_BYTE(0x0C); //display on, cursor+blink off
      ST7920_NCS();
    }
    break;

    case U8G_DEV_MSG_STOP: break;

    case U8G_DEV_MSG_PAGE_NEXT: {
      uint8_t* ptr;
      u8g_pb_t* pb = (u8g_pb_t*)(dev->dev_mem);
      y = pb->p.page_y0;
      ptr = (uint8_t*)pb->buf;

      ST7920_CS();
      for (i = 0; i < PAGE_HEIGHT; i ++) {
        ST7920_SET_CMD();
        if (y < 32) {
          ST7920_WRITE_BYTE(0x80 | y);       //y
          ST7920_WRITE_BYTE(0x80);           //x=0
        }
        else {
          ST7920_WRITE_BYTE(0x80 | (y - 32)); //y
          ST7920_WRITE_BYTE(0x80 | 8);       //x=64
        }
        ST7920_SET_DAT();
        ST7920_WRITE_BYTES(ptr, (LCD_PIXEL_WIDTH) / 8); //ptr is incremented inside of macro
        y++;
      }
      ST7920_NCS();
    }
    break;
  }
  #if PAGE_HEIGHT == 8
    return u8g_dev_pb8h1_base_fn(u8g, dev, msg, arg);
  #elif PAGE_HEIGHT == 16
    return u8g_dev_pb16h1_base_fn(u8g, dev, msg, arg);
  #else
    return u8g_dev_pb32h1_base_fn(u8g, dev, msg, arg);
  #endif
}