Reddit 128x64 i2c oled tester v1.0

/*
   Reddit oled 128x64 tester version 1.0
   5 October 2019

   This sketch is written to use a generic 128x64 OLED over I2C.
   Using an I2C address scanner sketch, the address that is reported for this screen (with mine) is 0x3C ... which isn't either of the addresses printed on the PCB (?)
   And yours might be different.

   Also note: this sketch is for a monochrome OLED screen.
   The actual screen I have has a yellow band across the top, and the rest of the screen is blue.
   That still counts as monochrome however, because it only accepts monochrome pixel data.
   You cannot change those yellow and blue colors; that is how the screen was made.

   I am also not using the reset pin for the OLED screen (the generic screen doesn't have one) so there is one line changed for that.

   I am using the Adafruit libraries here, as I could not get the U8glib library to work at all.
*/









// (below is standard Adafruit boilerplate comments)
/**************************************************************************
  This is an example for our Monochrome OLEDs based on SSD1306 drivers

  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/category/63_98

  This example is for a 128x32 pixel display using I2C to communicate
  3 pins are required to interface (two I2C and one reset).

  Adafruit invests time and resources providing this open
  source code, please support Adafruit and open-source
  hardware by purchasing products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries,
  with contributions from the open source community.
  BSD license, check license.txt for more information
  All text above, and the splash screen below must be
  included in any redistribution.
 **************************************************************************/


#include <SPI.h>
#include <Wire.h>

#include <Adafruit_GFX.h> // Adafruit library - google for where to download it.
#include <Adafruit_SSD1306.h> // Adafruit library - google for where to download it.

/*
  Notice! I had to edit the Adafruit_SSD1306.h file to get this to work...

  Open Adafruit_SSD1306.h in a text editor, and then uncomment line #28 that says:

  #define SSD1306_128_64 ///< DEPRECTAED: old way to specify 128x64 screen

  and then comment out the other two screen definitions (lines 29 and 30) if they are not already commented out.
*/

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)


#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
// Note: the above was originally set to [4], but you use -1 if you aren't using the reset pin.


Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define NUMFLAKES     10 // Number of snowflakes in the animation example

#define LOGO_HEIGHT   16
#define LOGO_WIDTH    16
static const unsigned char PROGMEM logo_bmp[] =
{ B00000000, B11000000,
  B00000001, B11000000,
  B00000001, B11000000,
  B00000011, B11100000,
  B11110011, B11100000,
  B11111110, B11111000,
  B01111110, B11111111,
  B00110011, B10011111,
  B00011111, B11111100,
  B00001101, B01110000,
  B00011011, B10100000,
  B00111111, B11100000,
  B00111111, B11110000,
  B01111100, B11110000,
  B01110000, B01110000,
  B00000000, B00110000
};

void setup() {
  Serial.begin(9600);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally

  //if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) { // Address 0x3D for 128x64 -----> 0x3D is the original (adafruit) value

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // This is the correct address of the generic 128 x 64 OLED screen that I have.

    // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    // To find the address of a new I2C device, the easiest way is to use an I2C scanner sketch.
    // There is one on the official Arduino site at -- https://playground.arduino.cc/Main/I2cScanner/
    // The address that is reported for this screen (with mine) is 0x3C
    // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();
  delay(2000); // Pause for 2 seconds

  // Clear the buffer
  display.clearDisplay();

  // Draw a single pixel in white
  display.drawPixel(10, 10, WHITE);

  // Show the display buffer on the screen. You MUST call display() after
  // drawing commands to make them visible on screen!
  display.display();
  delay(2000);
  // display.display() is NOT necessary after every single drawing command,
  // unless that's what you want...rather, you can batch up a bunch of
  // drawing operations and then update the screen all at once by calling
  // display.display(). These examples demonstrate both approaches...

  testdrawline();      // Draw many lines

  testdrawrect();      // Draw rectangles (outlines)

  testfillrect();      // Draw rectangles (filled)

  testdrawcircle();    // Draw circles (outlines)

  testfillcircle();    // Draw circles (filled)

  testdrawroundrect(); // Draw rounded rectangles (outlines)

  testfillroundrect(); // Draw rounded rectangles (filled)

  testdrawtriangle();  // Draw triangles (outlines)

  testfilltriangle();  // Draw triangles (filled)

  testdrawchar();      // Draw characters of the default font

  testdrawstyles();    // Draw 'stylized' characters

  testscrolltext();    // Draw scrolling text

  testdrawbitmap();    // Draw a small bitmap image

  // Invert and restore display, pausing in-between
  display.invertDisplay(true);
  delay(1000);
  display.invertDisplay(false);
  delay(1000);

  testanimate(logo_bmp, LOGO_WIDTH, LOGO_HEIGHT); // Animate bitmaps
}

void loop() {
}

void testdrawline() {
  int16_t i;

  display.clearDisplay(); // Clear display buffer

  for (i = 0; i < display.width(); i += 4) {
    display.drawLine(0, 0, i, display.height() - 1, WHITE);
    display.display(); // Update screen with each newly-drawn line
    delay(1);
  }
  for (i = 0; i < display.height(); i += 4) {
    display.drawLine(0, 0, display.width() - 1, i, WHITE);
    display.display();
    delay(1);
  }
  delay(250);

  display.clearDisplay();

  for (i = 0; i < display.width(); i += 4) {
    display.drawLine(0, display.height() - 1, i, 0, WHITE);
    display.display();
    delay(1);
  }
  for (i = display.height() - 1; i >= 0; i -= 4) {
    display.drawLine(0, display.height() - 1, display.width() - 1, i, WHITE);
    display.display();
    delay(1);
  }
  delay(250);

  display.clearDisplay();

  for (i = display.width() - 1; i >= 0; i -= 4) {
    display.drawLine(display.width() - 1, display.height() - 1, i, 0, WHITE);
    display.display();
    delay(1);
  }
  for (i = display.height() - 1; i >= 0; i -= 4) {
    display.drawLine(display.width() - 1, display.height() - 1, 0, i, WHITE);
    display.display();
    delay(1);
  }
  delay(250);

  display.clearDisplay();

  for (i = 0; i < display.height(); i += 4) {
    display.drawLine(display.width() - 1, 0, 0, i, WHITE);
    display.display();
    delay(1);
  }
  for (i = 0; i < display.width(); i += 4) {
    display.drawLine(display.width() - 1, 0, i, display.height() - 1, WHITE);
    display.display();
    delay(1);
  }

  delay(2000); // Pause for 2 seconds
}

void testdrawrect(void) {
  display.clearDisplay();

  for (int16_t i = 0; i < display.height() / 2; i += 2) {
    display.drawRect(i, i, display.width() - 2 * i, display.height() - 2 * i, WHITE);
    display.display(); // Update screen with each newly-drawn rectangle
    delay(1);
  }

  delay(2000);
}

void testfillrect(void) {
  display.clearDisplay();

  for (int16_t i = 0; i < display.height() / 2; i += 3) {
    // The INVERSE color is used so rectangles alternate white/black
    display.fillRect(i, i, display.width() - i * 2, display.height() - i * 2, INVERSE);
    display.display(); // Update screen with each newly-drawn rectangle
    delay(1);
  }

  delay(2000);
}

void testdrawcircle(void) {
  display.clearDisplay();

  for (int16_t i = 0; i < max(display.width(), display.height()) / 2; i += 2) {
    display.drawCircle(display.width() / 2, display.height() / 2, i, WHITE);
    display.display();
    delay(1);
  }

  delay(2000);
}

void testfillcircle(void) {
  display.clearDisplay();

  for (int16_t i = max(display.width(), display.height()) / 2; i > 0; i -= 3) {
    // The INVERSE color is used so circles alternate white/black
    display.fillCircle(display.width() / 2, display.height() / 2, i, INVERSE);
    display.display(); // Update screen with each newly-drawn circle
    delay(1);
  }

  delay(2000);
}

void testdrawroundrect(void) {
  display.clearDisplay();

  for (int16_t i = 0; i < display.height() / 2 - 2; i += 2) {
    display.drawRoundRect(i, i, display.width() - 2 * i, display.height() - 2 * i,
                          display.height() / 4, WHITE);
    display.display();
    delay(1);
  }

  delay(2000);
}

void testfillroundrect(void) {
  display.clearDisplay();

  for (int16_t i = 0; i < display.height() / 2 - 2; i += 2) {
    // The INVERSE color is used so round-rects alternate white/black
    display.fillRoundRect(i, i, display.width() - 2 * i, display.height() - 2 * i,
                          display.height() / 4, INVERSE);
    display.display();
    delay(1);
  }

  delay(2000);
}

void testdrawtriangle(void) {
  display.clearDisplay();

  for (int16_t i = 0; i < max(display.width(), display.height()) / 2; i += 5) {
    display.drawTriangle(
      display.width() / 2  , display.height() / 2 - i,
      display.width() / 2 - i, display.height() / 2 + i,
      display.width() / 2 + i, display.height() / 2 + i, WHITE);
    display.display();
    delay(1);
  }

  delay(2000);
}

void testfilltriangle(void) {
  display.clearDisplay();

  for (int16_t i = max(display.width(), display.height()) / 2; i > 0; i -= 5) {
    // The INVERSE color is used so triangles alternate white/black
    display.fillTriangle(
      display.width() / 2  , display.height() / 2 - i,
      display.width() / 2 - i, display.height() / 2 + i,
      display.width() / 2 + i, display.height() / 2 + i, INVERSE);
    display.display();
    delay(1);
  }

  delay(2000);
}

void testdrawchar(void) {
  display.clearDisplay();

  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font

  // Not all the characters will fit on the display. This is normal.
  // Library will draw what it can and the rest will be clipped.
  for (int16_t i = 0; i < 256; i++) {
    if (i == '\n') display.write(' ');
    else          display.write(i);
  }

  display.display();
  delay(2000);
}

void testdrawstyles(void) {
  display.clearDisplay();

  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(WHITE);        // Draw white text
  display.setCursor(0, 0);            // Start at top-left corner
  display.println(F("Hello, world!"));

  display.setTextColor(BLACK, WHITE); // Draw 'inverse' text
  display.println(3.141592);

  display.setTextSize(2);             // Draw 2X-scale text
  display.setTextColor(WHITE);
  display.print(F("0x")); display.println(0xDEADBEEF, HEX);

  display.display();
  delay(2000);
}

void testscrolltext(void) {
  display.clearDisplay();

  display.setTextSize(2); // Draw 2X-scale text
  display.setTextColor(WHITE);
  display.setCursor(10, 0);
  display.println(F("scroll"));
  display.display();      // Show initial text
  delay(100);

  // Scroll in various directions, pausing in-between:
  display.startscrollright(0x00, 0x0F);
  delay(2000);
  display.stopscroll();
  delay(1000);
  display.startscrollleft(0x00, 0x0F);
  delay(2000);
  display.stopscroll();
  delay(1000);
  display.startscrolldiagright(0x00, 0x07);
  delay(2000);
  display.startscrolldiagleft(0x00, 0x07);
  delay(2000);
  display.stopscroll();
  delay(1000);
}

void testdrawbitmap(void) {
  display.clearDisplay();

  display.drawBitmap(
    (display.width()  - LOGO_WIDTH ) / 2,
    (display.height() - LOGO_HEIGHT) / 2,
    logo_bmp, LOGO_WIDTH, LOGO_HEIGHT, 1);
  display.display();
  delay(1000);
}

#define XPOS   0 // Indexes into the 'icons' array in function below
#define YPOS   1
#define DELTAY 2

void testanimate(const uint8_t *bitmap, uint8_t w, uint8_t h) {
  int8_t f, icons[NUMFLAKES][3];

  // Initialize 'snowflake' positions
  for (f = 0; f < NUMFLAKES; f++) {
    icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());
    icons[f][YPOS]   = -LOGO_HEIGHT;
    icons[f][DELTAY] = random(1, 6);
    Serial.print(F("x: "));
    Serial.print(icons[f][XPOS], DEC);
    Serial.print(F(" y: "));
    Serial.print(icons[f][YPOS], DEC);
    Serial.print(F(" dy: "));
    Serial.println(icons[f][DELTAY], DEC);
  }

  for (;;) { // Loop forever...
    display.clearDisplay(); // Clear the display buffer

    // Draw each snowflake:
    for (f = 0; f < NUMFLAKES; f++) {
      display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, WHITE);
    }

    display.display(); // Show the display buffer on the screen
    delay(200);        // Pause for 1/10 second

    // Then update coordinates of each flake...
    for (f = 0; f < NUMFLAKES; f++) {
      icons[f][YPOS] += icons[f][DELTAY];
      // If snowflake is off the bottom of the screen...
      if (icons[f][YPOS] >= display.height()) {
        // Reinitialize to a random position, just off the top
        icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());
        icons[f][YPOS]   = -LOGO_HEIGHT;
        icons[f][DELTAY] = random(1, 6);
      }
    }
  }
}


// ~~~~~~~~~ the end ~~~~~~~~~~~