OLED-128x32-i2c.ino

#include <Wire.h>

#define WIDTH 128
#define HEIGHT 32

unsigned char buffer[WIDTH*HEIGHT/8];

static const byte ASCII[][5] PROGMEM = {
   {0x00, 0x00, 0x00, 0x00, 0x00} // 20
  ,{0x00, 0x00, 0x5f, 0x00, 0x00} // 21 !
  ,{0x00, 0x07, 0x00, 0x07, 0x00} // 22 "
  ,{0x14, 0x7f, 0x14, 0x7f, 0x14} // 23 #
  ,{0x24, 0x2a, 0x7f, 0x2a, 0x12} // 24 $
  ,{0x23, 0x13, 0x08, 0x64, 0x62} // 25 %
  ,{0x36, 0x49, 0x55, 0x22, 0x50} // 26 &
  ,{0x00, 0x05, 0x03, 0x00, 0x00} // 27 '
  ,{0x00, 0x1c, 0x22, 0x41, 0x00} // 28 (
  ,{0x00, 0x41, 0x22, 0x1c, 0x00} // 29 )
  ,{0x14, 0x08, 0x3e, 0x08, 0x14} // 2a *
  ,{0x08, 0x08, 0x3e, 0x08, 0x08} // 2b +
  ,{0x00, 0x50, 0x30, 0x00, 0x00} // 2c ,
  ,{0x08, 0x08, 0x08, 0x08, 0x08} // 2d -
  ,{0x00, 0x60, 0x60, 0x00, 0x00} // 2e .
  ,{0x20, 0x10, 0x08, 0x04, 0x02} // 2f /
  ,{0x3e, 0x51, 0x49, 0x45, 0x3e} // 30 0
  ,{0x00, 0x42, 0x7f, 0x40, 0x00} // 31 1
  ,{0x42, 0x61, 0x51, 0x49, 0x46} // 32 2
  ,{0x21, 0x41, 0x45, 0x4b, 0x31} // 33 3
  ,{0x18, 0x14, 0x12, 0x7f, 0x10} // 34 4
  ,{0x27, 0x45, 0x45, 0x45, 0x39} // 35 5
  ,{0x3c, 0x4a, 0x49, 0x49, 0x30} // 36 6
  ,{0x01, 0x71, 0x09, 0x05, 0x03} // 37 7
  ,{0x36, 0x49, 0x49, 0x49, 0x36} // 38 8
  ,{0x06, 0x49, 0x49, 0x29, 0x1e} // 39 9
  ,{0x00, 0x36, 0x36, 0x00, 0x00} // 3a :
  ,{0x00, 0x56, 0x36, 0x00, 0x00} // 3b ;
  ,{0x08, 0x14, 0x22, 0x41, 0x00} // 3c <
  ,{0x14, 0x14, 0x14, 0x14, 0x14} // 3d =
  ,{0x00, 0x41, 0x22, 0x14, 0x08} // 3e >
  ,{0x02, 0x01, 0x51, 0x09, 0x06} // 3f ?
  ,{0x32, 0x49, 0x79, 0x41, 0x3e} // 40 @
  ,{0x7e, 0x11, 0x11, 0x11, 0x7e} // 41 A
  ,{0x7f, 0x49, 0x49, 0x49, 0x36} // 42 B
  ,{0x3e, 0x41, 0x41, 0x41, 0x22} // 43 C
  ,{0x7f, 0x41, 0x41, 0x22, 0x1c} // 44 D
  ,{0x7f, 0x49, 0x49, 0x49, 0x41} // 45 E
  ,{0x7f, 0x09, 0x09, 0x09, 0x01} // 46 F
  ,{0x3e, 0x41, 0x49, 0x49, 0x7a} // 47 G
  ,{0x7f, 0x08, 0x08, 0x08, 0x7f} // 48 H
  ,{0x00, 0x41, 0x7f, 0x41, 0x00} // 49 I
  ,{0x20, 0x40, 0x41, 0x3f, 0x01} // 4a J
  ,{0x7f, 0x08, 0x14, 0x22, 0x41} // 4b K
  ,{0x7f, 0x40, 0x40, 0x40, 0x40} // 4c L
  ,{0x7f, 0x02, 0x0c, 0x02, 0x7f} // 4d M
  ,{0x7f, 0x04, 0x08, 0x10, 0x7f} // 4e N
  ,{0x3e, 0x41, 0x41, 0x41, 0x3e} // 4f O
  ,{0x7f, 0x09, 0x09, 0x09, 0x06} // 50 P
  ,{0x3e, 0x41, 0x51, 0x21, 0x5e} // 51 Q
  ,{0x7f, 0x09, 0x19, 0x29, 0x46} // 52 R
  ,{0x46, 0x49, 0x49, 0x49, 0x31} // 53 S
  ,{0x01, 0x01, 0x7f, 0x01, 0x01} // 54 T
  ,{0x3f, 0x40, 0x40, 0x40, 0x3f} // 55 U
  ,{0x1f, 0x20, 0x40, 0x20, 0x1f} // 56 V
  ,{0x3f, 0x40, 0x38, 0x40, 0x3f} // 57 W
  ,{0x63, 0x14, 0x08, 0x14, 0x63} // 58 X
  ,{0x07, 0x08, 0x70, 0x08, 0x07} // 59 Y
  ,{0x61, 0x51, 0x49, 0x45, 0x43} // 5a Z
  ,{0x00, 0x7f, 0x41, 0x41, 0x00} // 5b [
  ,{0x02, 0x04, 0x08, 0x10, 0x20} // 5c ¥
  ,{0x00, 0x41, 0x41, 0x7f, 0x00} // 5d ]
  ,{0x04, 0x02, 0x01, 0x02, 0x04} // 5e ^
  ,{0x40, 0x40, 0x40, 0x40, 0x40} // 5f _
  ,{0x00, 0x01, 0x02, 0x04, 0x00} // 60 `
  ,{0x20, 0x54, 0x54, 0x54, 0x78} // 61 a
  ,{0x7f, 0x48, 0x44, 0x44, 0x38} // 62 b
  ,{0x38, 0x44, 0x44, 0x44, 0x20} // 63 c
  ,{0x38, 0x44, 0x44, 0x48, 0x7f} // 64 d
  ,{0x38, 0x54, 0x54, 0x54, 0x18} // 65 e
  ,{0x08, 0x7e, 0x09, 0x01, 0x02} // 66 f
  ,{0x0c, 0x52, 0x52, 0x52, 0x3e} // 67 g
  ,{0x7f, 0x08, 0x04, 0x04, 0x78} // 68 h
  ,{0x00, 0x44, 0x7d, 0x40, 0x00} // 69 i
  ,{0x20, 0x40, 0x44, 0x3d, 0x00} // 6a j
  ,{0x7f, 0x10, 0x28, 0x44, 0x00} // 6b k
  ,{0x00, 0x41, 0x7f, 0x40, 0x00} // 6c l
  ,{0x7c, 0x04, 0x18, 0x04, 0x78} // 6d m
  ,{0x7c, 0x08, 0x04, 0x04, 0x78} // 6e n
  ,{0x38, 0x44, 0x44, 0x44, 0x38} // 6f o
  ,{0x7c, 0x14, 0x14, 0x14, 0x08} // 70 p
  ,{0x08, 0x14, 0x14, 0x18, 0x7c} // 71 q
  ,{0x7c, 0x08, 0x04, 0x04, 0x08} // 72 r
  ,{0x48, 0x54, 0x54, 0x54, 0x20} // 73 s
  ,{0x04, 0x3f, 0x44, 0x40, 0x20} // 74 t
  ,{0x3c, 0x40, 0x40, 0x20, 0x7c} // 75 u
  ,{0x1c, 0x20, 0x40, 0x20, 0x1c} // 76 v
  ,{0x3c, 0x40, 0x30, 0x40, 0x3c} // 77 w
  ,{0x44, 0x28, 0x10, 0x28, 0x44} // 78 x
  ,{0x0c, 0x50, 0x50, 0x50, 0x3c} // 79 y
  ,{0x44, 0x64, 0x54, 0x4c, 0x44} // 7a z
  ,{0x00, 0x08, 0x36, 0x41, 0x00} // 7b {
  ,{0x00, 0x00, 0x7f, 0x00, 0x00} // 7c |
  ,{0x00, 0x41, 0x36, 0x08, 0x00} // 7d }
  ,{0x10, 0x08, 0x08, 0x10, 0x08} // 7e ←
  ,{0x78, 0x46, 0x41, 0x46, 0x78} // 7f →
};


void oledWriteString(const char *characters, int x=0, int y=0) {
  uint8_t * p = buffer + y*WIDTH/8 + x;
  while (*characters) {
    oledWriteCharacter(*characters++, &p);
  }
}

void oledWriteCharacter(char character, uint8_t ** pp) {
  uint8_t * p = *pp;
  for (int i=0; i<5; i++) {
    *p++ = ( pgm_read_byte(&ASCII[character - 0x20][i]) );
  }
  *p++ = 0x00; // 1px space
  *pp = p;
}

void ssd1306_command(uint8_t c) {
    Wire.beginTransmission(0x3c);
    Wire.write(0x00);
    Wire.write(c);
    Wire.endTransmission();
}

void display() {
  ssd1306_command(0x21); // Set column
  ssd1306_command(0);   // Column start address (0 = reset)
  ssd1306_command(WIDTH-1); // Column end address (127 = reset)
  ssd1306_command(0x22); // Set page
  ssd1306_command(0); // Page start address (0 = reset)
  ssd1306_command(3); // Page end address
  for (uint16_t i=0; i<WIDTH*HEIGHT/8; i++) {
    Wire.beginTransmission(0x3c);
    Wire.write(0x40); // data
    for (int x=0; x<16; x++)
      Wire.write(buffer[i++]);
    i--;
    Wire.endTransmission();
  }
}

void setup_i2c(){
  uint8_t seq[]={
    0xAE, 0xD5, 0x80, 0xA8, HEIGHT-1, 0xD3, 0x00, 0x40, 0x8D, 0x14, 0x20, 0x00, 0xA1,
    0xC8, 0xDA, 0x02, 0x81, 0x8F, 0xD9, 0xF1, 0xDB, 0x40, 0xA4, 0xA6, 0x2E, 0xAF
  };
  for (int i=0; i<sizeof(seq)/sizeof(*seq); i++) ssd1306_command(seq[i]);
}

void setup() {
    Wire.begin();
    setup_i2c();
    //for (int i=0; i<WIDTH*HEIGHT/8; i++) buffer[i]=i%2 ? 0xAA : 0x55;
    oledWriteString("Hello kickstarter!");
    oledWriteString("Device 1", 0, 24);
    display();
}


void loop() {
}