I2C OLED (SSD1306)に画像を出す。Wire版

Wireライブラリー ＋ delay() を使って一般的なArduinoでだいたい動くようにしました。

・ATtiny 412 (megaTinyCore)
・UNO R1 (ATmega328)
・UNO R4 MINIMA (RA4M1)
・RL78/G15 Fast Prototyping Board

で動くことを確認しました。
ATyiny202には 2269バイトとフラッシュメモリ 2kByteをオーバーしてしまい不可でした。

こんな感じで、、

ブレッドボードなしでつないでみた。

// tinyOLEDdemo - controlling an I²C OLED (SSD1306)
#include <Wire.h>

uint8_t const img_i[] = {   32,   32, // px
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x82, 0xee, 0xfe, 0xfe, 0xfc, 0xf8, 0x70, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xc0, 0xe0, 0xf0,
  0xf8, 0x7e, 0xff, 0xff, 0xef, 0xc7, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x20, 0x20, 0x30, 0x10, 0x18, 0x1c, 0x0e, 0x0f, 0x07, 0x07, 0x03, 0x01, 0x01,
  0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x1e, 0x3f, 0x7f, 0x3f, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
uint8_t const img_qr[] = {  23,   23, // px
  0xff, 0x01, 0x7d, 0x45, 0x45, 0x45, 0x7d, 0x01, 0xff, 0x2b, 0xcb, 0x71, 0xdf, 0x01, 0xff, 0x01,
  0x7d, 0x45, 0x45, 0x45, 0x7d, 0x01, 0xff, 0xff, 0x59, 0x55, 0x7d, 0x71, 0x49, 0x67, 0x55, 0xf9,
  0x3d, 0xc2, 0x8b, 0x57, 0x91, 0x3d, 0x77, 0xc9, 0x27, 0xb9, 0x93, 0x71, 0xf7, 0xff, 0xff, 0xc0,
  0xdf, 0xd1, 0xd1, 0xd1, 0xdf, 0xc0, 0xff, 0xc1, 0xf3, 0xfa, 0xcd, 0xd5, 0xc8, 0xc5, 0xea, 0xe6,
  0xe8, 0xd8, 0xcb, 0xec, 0xff
};

// ---- OLED Implementation ----------------------------------------------------

#define OLED_ADDR       0x3c             // OLED write address (Wire lib.:0x3c)
#define OLED_CMD_MODE   0x00             // set command mode
#define OLED_DAT_MODE   0x40             // set data mode

const uint8_t OLED_INIT_CMD[] = {        // OLED init settings
  0xA8, 0x3F,           // set multiplex (HEIGHT-1): 0x1F for 128x32, 0x3F for 128x64
  0x22, 0x00, 0x07,     // set min and max page                      
  0x20, 0x00,           // set horizontal memory addressing mode
  0xDA, 0x12,           // set COM pins hardware configuration to alternative
  0x8D, 0x14,           // enable charge pump
  0xAF                  // switch on OLED
};

void OLED_init(void) {                    // OLED init function
  Wire.begin();                           //   initialize I2C first
  Wire.beginTransmission(OLED_ADDR);      //   start transmission to OLED
  Wire.write(OLED_CMD_MODE);              //   set command mode
  for (uint8_t i=0; i<sizeof(OLED_INIT_CMD); i++) Wire.write(OLED_INIT_CMD[i]); // send the command bytes
  Wire.endTransmission();                 //   stop transmission
}

void OLED_cursor(uint8_t xpos, uint8_t ypos) {// OLED set the cursor
  Wire.beginTransmission(OLED_ADDR);      //   start transmission to OLED
  Wire.write(OLED_CMD_MODE);              //   set command mode
  Wire.write(xpos & 0x0F);                //   set low nibble of start column
  Wire.write(0x10 | (xpos >> 4));         //   set high nibble of start column
  Wire.write(0xB0 | (ypos & 0x07));       //   set start page
  Wire.endTransmission();                 //   stop transmission
}

void OLED_clear(uint8_t p) {              // OLED clear screen with pattern
  OLED_cursor(0, 0);                      //   set cursor at upper left corner
  for(uint8_t j=1024/16; j; j--) {
    Wire.beginTransmission(OLED_ADDR);    //   start transmission to OLED
    Wire.write(OLED_DAT_MODE);            //   set data mode
    for(uint8_t i=16; i; i--) Wire.write(p);// clear the screen with p
    Wire.endTransmission();               //   stop transmission
  }
}

void OLED_image(uint8_t xpos, uint8_t ypos, const uint8_t *d) {// OLED set image
  const uint8_t w=*d++, h=*d++;
  for(uint8_t y=0, i=0; y<(h+7)/8; y++) {
    OLED_cursor(xpos, ypos + y);          //   set the cursor
    for(uint8_t x=0; x<w; x++) {
      if( !i ) {
        Wire.beginTransmission(OLED_ADDR);//   start transmission to OLED
        Wire.write(OLED_DAT_MODE);        //   set data mode
      }
      Wire.write( *d++ );
      if( ++i==31 || w-x==1 ) {
        Wire.endTransmission();           //   stop transmission
        i=0;
      }
    }
  }
}

void OLED_image2x(uint8_t xpos, uint8_t ypos, const uint8_t *d) {// OLED set 2x image
  const uint8_t x2[]={ 0x0,0x3,0xc,0xf,0x30,0x33,0x3c,0x3f,0xc0,0xc3,0xcc,0xcf,0xf0,0xf3,0xfc,0xff };
  const uint8_t w=*d++, h=*d++;
  for(uint8_t y=0, i=0; y<(h+3)/4; y++) {
    OLED_cursor(xpos, ypos + y);          //   set the cursor
    for(uint8_t x=0, t; x<w; x++) {
      if( !i ) {
        Wire.beginTransmission(OLED_ADDR);//   start transmission to OLED
        Wire.write(OLED_DAT_MODE);        //   set data mode
      }
      Wire.write( t = x2[ d[x+(y/2)*w] >> (y%2*4) & 0xf ] );
      Wire.write( t );
      if( (i+=2)>29 || w-x==1 ) {
        Wire.endTransmission();           //   stop transmission
        i=0;
      }
    }
  }
}

// ---- Main Function ----------------------------------------------------------

void setup() {
  delay(100);                             // add delay
  OLED_init();                            // setup I2C OLED
}

void loop() {
  OLED_clear(0x00);                       // clear screen with black
  OLED_image( 48, 2, img_i );
  delay(1000);
  OLED_image2x( 32, 0, img_i );
  delay(2000);
  OLED_clear(0xff);                       // clear screen with white
  OLED_image( 52, 2, img_qr );
  delay(1000);
  OLED_image2x( 40, 1, img_qr );
  delay(4000);
}

タグ：OLED SSD1306 I2C