File content as of revision 4:9ad3bc45b6ce:

#include "DisplayN18.h"

DisplayN18::DisplayN18() : resetPin(P0_20), backlightPin(P0_19), rsPin(P0_7), csPin(P0_2), spi(P0_21, P0_22, P1_15) {
    this->resetPin.write(false);
    this->backlightPin.write(true);
    this->rsPin.write(false);
    
    this->spi.format(8, 3);
    this->spi.frequency(15000000);
    
    this->initialize();
}

void DisplayN18::writeCommand(unsigned char command) {
    this->rsPin.write(false);
    
    this->csPin.write(false);
    
    this->spi.write(command);
    
    this->csPin.write(true);
}

void DisplayN18::writeData(unsigned char data) {
    this->writeData(&data, 1);
}

void DisplayN18::writeData(const unsigned char* data, unsigned int length) {
    this->rsPin.write(true);
    
    this->csPin.write(false);
    
    for (unsigned int i = 0; i < length; i++)
        this->spi.write(data[i]);
    
    this->csPin.write(true);
}

void DisplayN18::reset() {
    this->resetPin.write(false);
    wait_ms(300);
    
    this->resetPin.write(true);
    wait_ms(500);
}

void DisplayN18::initialize() {
    this->reset();

    this->writeCommand(0x11);
    
    wait_ms(120);

    this->writeCommand(0xB1);
    this->writeData(0x01); this->writeData(0x2C); this->writeData(0x2D);
    this->writeCommand(0xB2);
    this->writeData(0x01); this->writeData(0x2C); this->writeData(0x2D);
    this->writeCommand(0xB3);
    this->writeData(0x01); this->writeData(0x2C); this->writeData(0x2D);
    this->writeData(0x01); this->writeData(0x2C); this->writeData(0x2D);

    this->writeCommand(0xB4);
    this->writeData(0x07);

    this->writeCommand(0xC0);
    this->writeData(0xA2); this->writeData(0x02); this->writeData(0x84);
    this->writeCommand(0xC1); this->writeData(0xC5);
    this->writeCommand(0xC2);
    this->writeData(0x0A); this->writeData(0x00);
    this->writeCommand(0xC3);
    this->writeData(0x8A); this->writeData(0x2A);
    this->writeCommand(0xC4);
    this->writeData(0x8A); this->writeData(0xEE);

    this->writeCommand(0xC5);
    this->writeData(0x0E);

    this->writeCommand(0x36);
    this->writeData(0xA8);

    this->writeCommand(0xe0);
    this->writeData(0x0f); this->writeData(0x1a);
    this->writeData(0x0f); this->writeData(0x18);
    this->writeData(0x2f); this->writeData(0x28);
    this->writeData(0x20); this->writeData(0x22);
    this->writeData(0x1f); this->writeData(0x1b);
    this->writeData(0x23); this->writeData(0x37); this->writeData(0x00);
    this->writeData(0x07);
    this->writeData(0x02); this->writeData(0x10);

    this->writeCommand(0xe1);
    this->writeData(0x0f); this->writeData(0x1b);
    this->writeData(0x0f); this->writeData(0x17);
    this->writeData(0x33); this->writeData(0x2c);
    this->writeData(0x29); this->writeData(0x2e);
    this->writeData(0x30); this->writeData(0x30);
    this->writeData(0x39); this->writeData(0x3f);
    this->writeData(0x00); this->writeData(0x07);
    this->writeData(0x03); this->writeData(0x10);

    this->writeCommand(0x2a);
    this->writeData(0x00); this->writeData(0x00);
    this->writeData(0x00); this->writeData(0x7f);
    this->writeCommand(0x2b);
    this->writeData(0x00); this->writeData(0x00);
    this->writeData(0x00); this->writeData(0x9f);

    this->writeCommand(0xF0);
    this->writeData(0x01);
    this->writeCommand(0xF6);
    this->writeData(0x00);

    this->writeCommand(0x3A);
    this->writeData(0x05);

    this->writeCommand(0x29);

    this->clear();
}

void DisplayN18::setClippingArea(unsigned char x, unsigned char y, unsigned char width, unsigned char height) {
    unsigned char data[4] = { 0x00, 0x00, 0x00, 0x00 };

    data[1] = x;
    data[3] = x + width;
    this->writeCommand(0x2A);
    this->writeData(data, 4);

    data[1] = y;
    data[3] = y + height;
    this->writeCommand(0x2B);
    this->writeData(data, 4);
}

unsigned short DisplayN18::rgbToShort(unsigned char r, unsigned char g, unsigned char b) {
    unsigned short red = r;
    unsigned short green = g;
    unsigned short blue = b;

    red /= 8;
    green /= 4;
    blue /= 8;

    red &= 0x1F;
    green &= 0x3F;
    blue &= 0x1F;

    red <<= 3;
    blue <<= 8;
    green = ((green & 0x7) << 13) + ((green & 0x38) >> 3);

    return red | green | blue;
}

void DisplayN18::clear(unsigned short backColor) {
    for (unsigned int i = 0; i < DisplayN18::WIDTH; i += 10)
        for (unsigned int j = 0; j < DisplayN18::HEIGHT; j += 8)
            this->fillRect(i, j, 10, 8, backColor);
}

void DisplayN18::draw(const unsigned short* data, int x, int y, int width, int height) {
    this->setClippingArea(x, y, width - 1, height - 1);
    this->writeCommand(0x2C);
    this->writeData(reinterpret_cast<const unsigned char*>(data), width * height * 2);
}

void DisplayN18::setPixel(int x, int y, unsigned short foreColor) {
    this->draw(&foreColor, x, y, 1, 1);
}

void DisplayN18::fillRect(int x, int y, int width, int height, unsigned short foreColor) {
    this->setClippingArea(static_cast<unsigned char>(x), static_cast<unsigned char>(y), static_cast<unsigned char>(width - 1), static_cast<unsigned char>(height));
    
    this->writeCommand(0x2C);
    
    unsigned short buffer[50];
    for (int j = 0; j < sizeof(buffer) / 2; j++)
        buffer[j] = foreColor;

    this->rsPin.write(true);

    int i;
    for (i = sizeof(buffer); i < height * width * 2; i += sizeof(buffer))
        this->writeData(reinterpret_cast<unsigned char*>(buffer), sizeof(buffer));
    
    i -= sizeof(buffer);
    if (i != height * width * 2)
        this->writeData(reinterpret_cast<unsigned char*>(buffer), height * width * 2 - i);
}

void DisplayN18::drawRect(int x, int y, int width, int height, unsigned short foreColor) {
    this->drawLine(x, y, x + width, y, foreColor);
    this->drawLine(x, y + height, x + width, y + height, foreColor);
    this->drawLine(x, y, x, y + height, foreColor);
    this->drawLine(x + width, y, x + width, y + height, foreColor);
}

void DisplayN18::fillCircle(int x, int y, int radius, unsigned short foreColor) {
    int f = 1 - radius;
    int dd_f_x = 1;
    int dd_f_y = -2 * radius;
    int x1 = 0;
    int y1 = radius;

    for (int i = y - radius; i <= y + radius; i++)
        this->setPixel(x, i, foreColor);

    while (x1 < y1) {
        if (f >= 0) {
            y1--;
            dd_f_y += 2;
            f += dd_f_y;
        }

        x1++;
        dd_f_x += 2;
        f += dd_f_x;

        for (int i = y - y1; i <= y + y1; i++) {
            this->setPixel(x + x1, i, foreColor);
            this->setPixel(x - x1, i, foreColor);
        }

        for (int i = y - x1; i <= y + x1; i++) {
            this->setPixel(x + y1, i, foreColor);
            this->setPixel(x - y1, i, foreColor);
        }
    }
}

void DisplayN18::drawCircle(int x, int y, int radius, unsigned short foreColor) {
    int f = 1 - radius;
    int dd_f_x = 1;
    int dd_f_y = -2 * radius;
    int x1 = 0;
    int y1 = radius;

    this->setPixel(x, y + radius, foreColor);
    this->setPixel(x, y - radius, foreColor);
    this->setPixel(x + radius, y, foreColor);
    this->setPixel(x - radius, y, foreColor);

    while (x1 < y1) {
        if (f >= 0) {
            y1--;
            dd_f_y += 2;
            f += dd_f_y;
        }

        x1++;
        dd_f_x += 2;
        f += dd_f_x;

        this->setPixel(x + x1, y + y1, foreColor);
        this->setPixel(x - x1, y + y1, foreColor);
        this->setPixel(x + x1, y - y1, foreColor);
        this->setPixel(x - x1, y - y1, foreColor);

        this->setPixel(x + y1, y + x1, foreColor);
        this->setPixel(x - y1, y + x1, foreColor);
        this->setPixel(x + y1, y - x1, foreColor);
        this->setPixel(x - y1, y - x1, foreColor);
    }
}

void DisplayN18::drawLine(int x0, int y0, int x1, int y1, unsigned short foreColor) {
    if (x0 == x1) {
        if (y1 < y0) {
            int temp = y0;
            y0 = y1;
            y1 = temp;
        }

        this->setClippingArea(static_cast<unsigned char>(x0), static_cast<unsigned char>(y0), 0, static_cast<unsigned char>(y1 - y0 - 1));
        this->writeCommand(0x2C);

        unsigned short data[DisplayN18::STEP];
        for (int i = 0; i < DisplayN18::STEP; i++)
            data[i] = foreColor;

        for (unsigned char thisY = y0; thisY < y1; thisY += DisplayN18::STEP)
            this->writeData(reinterpret_cast<unsigned char*>(data), (thisY + DisplayN18::STEP <= y1 ? DisplayN18::STEP : y1 - thisY) * 2);

        return;
    }

    if (y0 == y1) {
        if (x1 < x0) {
            int temp = x0;
            x0 = x1;
            x1 = temp;
        }

        this->setClippingArea(static_cast<unsigned char>(x0), static_cast<unsigned char>(y0), static_cast<unsigned char>(x1 - x0 - 1), 0);
        this->writeCommand(0x2C);

        unsigned short data[DisplayN18::STEP];
        for (int i = 0; i < DisplayN18::STEP; i++)
            data[i] = foreColor;

        for (unsigned char thisX = x0; thisX < x1; thisX += DisplayN18::STEP)
            this->writeData(reinterpret_cast<unsigned char*>(data), (thisX + DisplayN18::STEP <= x1 ? DisplayN18::STEP : x1 - thisX) * 2);

        return;
    }

    int t;
    bool steep = ((y1 - y0) < 0 ? -(y1 - y0) : (y1 - y0)) > ((x1 - x0) < 0 ? -(x1 - x0) : (x1 - x0));

    if (steep) {
        t = x0;
        x0 = y0;
        y0 = t;
        t = x1;
        x1 = y1;
        y1 = t;
    }

    if (x0 > x1) {
        t = x0;
        x0 = x1;
        x1 = t;

        t = y0;
        y0 = y1;
        y1 = t;
    }

    int dx, dy;
    dx = x1 - x0;
    dy = (y1 - y0) < 0 ? -(y1 - y0) : (y1 - y0);

    int err = (dx / 2);
    int ystep;

    ystep = y0 < y1 ? 1 : -1;

    for (; x0 < x1; x0++) {
        if (steep)
            this->setPixel(y0, x0, foreColor);
        else
            this->setPixel(x0, y0, foreColor);

        err -= dy;

        if (err < 0) {
            y0 += (char)ystep;
            err += dx;
        }
    }
}

unsigned char characters[95 * 5] = {
    0x00, 0x00, 0x00, 0x00, 0x00, /* Space  0x20 */
    0x00, 0x00, 0x4f, 0x00, 0x00, /* ! */
    0x00, 0x07, 0x00, 0x07, 0x00, /* " */
    0x14, 0x7f, 0x14, 0x7f, 0x14, /* # */
    0x24, 0x2a, 0x7f, 0x2a, 0x12, /* $ */
    0x23, 0x13, 0x08, 0x64, 0x62, /* % */
    0x36, 0x49, 0x55, 0x22, 0x20, /* & */
    0x00, 0x05, 0x03, 0x00, 0x00, /* ' */
    0x00, 0x1c, 0x22, 0x41, 0x00, /* ( */
    0x00, 0x41, 0x22, 0x1c, 0x00, /* ) */
    0x14, 0x08, 0x3e, 0x08, 0x14, /* // */
    0x08, 0x08, 0x3e, 0x08, 0x08, /* + */
    0x50, 0x30, 0x00, 0x00, 0x00, /* , */
    0x08, 0x08, 0x08, 0x08, 0x08, /* - */
    0x00, 0x60, 0x60, 0x00, 0x00, /* . */
    0x20, 0x10, 0x08, 0x04, 0x02, /* / */
    0x3e, 0x51, 0x49, 0x45, 0x3e, /* 0      0x30 */
    0x00, 0x42, 0x7f, 0x40, 0x00, /* 1 */
    0x42, 0x61, 0x51, 0x49, 0x46, /* 2 */
    0x21, 0x41, 0x45, 0x4b, 0x31, /* 3 */
    0x18, 0x14, 0x12, 0x7f, 0x10, /* 4 */
    0x27, 0x45, 0x45, 0x45, 0x39, /* 5 */
    0x3c, 0x4a, 0x49, 0x49, 0x30, /* 6 */
    0x01, 0x71, 0x09, 0x05, 0x03, /* 7 */
    0x36, 0x49, 0x49, 0x49, 0x36, /* 8 */
    0x06, 0x49, 0x49, 0x29, 0x1e, /* 9 */
    0x00, 0x36, 0x36, 0x00, 0x00, /* : */
    0x00, 0x56, 0x36, 0x00, 0x00, /* ; */
    0x08, 0x14, 0x22, 0x41, 0x00, /* < */
    0x14, 0x14, 0x14, 0x14, 0x14, /* = */
    0x00, 0x41, 0x22, 0x14, 0x08, /* > */
    0x02, 0x01, 0x51, 0x09, 0x06, /* ? */
    0x3e, 0x41, 0x5d, 0x55, 0x1e, /* @      0x40 */
    0x7e, 0x11, 0x11, 0x11, 0x7e, /* A */
    0x7f, 0x49, 0x49, 0x49, 0x36, /* B */
    0x3e, 0x41, 0x41, 0x41, 0x22, /* C */
    0x7f, 0x41, 0x41, 0x22, 0x1c, /* D */
    0x7f, 0x49, 0x49, 0x49, 0x41, /* E */
    0x7f, 0x09, 0x09, 0x09, 0x01, /* F */
    0x3e, 0x41, 0x49, 0x49, 0x7a, /* G */
    0x7f, 0x08, 0x08, 0x08, 0x7f, /* H */
    0x00, 0x41, 0x7f, 0x41, 0x00, /* I */
    0x20, 0x40, 0x41, 0x3f, 0x01, /* J */
    0x7f, 0x08, 0x14, 0x22, 0x41, /* K */
    0x7f, 0x40, 0x40, 0x40, 0x40, /* L */
    0x7f, 0x02, 0x0c, 0x02, 0x7f, /* M */
    0x7f, 0x04, 0x08, 0x10, 0x7f, /* N */
    0x3e, 0x41, 0x41, 0x41, 0x3e, /* O */
    0x7f, 0x09, 0x09, 0x09, 0x06, /* P      0x50 */
    0x3e, 0x41, 0x51, 0x21, 0x5e, /* Q */
    0x7f, 0x09, 0x19, 0x29, 0x46, /* R */
    0x26, 0x49, 0x49, 0x49, 0x32, /* S */
    0x01, 0x01, 0x7f, 0x01, 0x01, /* T */
    0x3f, 0x40, 0x40, 0x40, 0x3f, /* U */
    0x1f, 0x20, 0x40, 0x20, 0x1f, /* V */
    0x3f, 0x40, 0x38, 0x40, 0x3f, /* W */
    0x63, 0x14, 0x08, 0x14, 0x63, /* X */
    0x07, 0x08, 0x70, 0x08, 0x07, /* Y */
    0x61, 0x51, 0x49, 0x45, 0x43, /* Z */
    0x00, 0x7f, 0x41, 0x41, 0x00, /* [ */
    0x02, 0x04, 0x08, 0x10, 0x20, /* \ */
    0x00, 0x41, 0x41, 0x7f, 0x00, /* ] */
    0x04, 0x02, 0x01, 0x02, 0x04, /* ^ */
    0x40, 0x40, 0x40, 0x40, 0x40, /* _ */
    0x00, 0x00, 0x03, 0x05, 0x00, /* `      0x60 */
    0x20, 0x54, 0x54, 0x54, 0x78, /* a */
    0x7F, 0x44, 0x44, 0x44, 0x38, /* b */
    0x38, 0x44, 0x44, 0x44, 0x44, /* c */
    0x38, 0x44, 0x44, 0x44, 0x7f, /* d */
    0x38, 0x54, 0x54, 0x54, 0x18, /* e */
    0x04, 0x04, 0x7e, 0x05, 0x05, /* f */
    0x08, 0x54, 0x54, 0x54, 0x3c, /* g */
    0x7f, 0x08, 0x04, 0x04, 0x78, /* h */
    0x00, 0x44, 0x7d, 0x40, 0x00, /* i */
    0x20, 0x40, 0x44, 0x3d, 0x00, /* j */
    0x7f, 0x10, 0x28, 0x44, 0x00, /* k */
    0x00, 0x41, 0x7f, 0x40, 0x00, /* l */
    0x7c, 0x04, 0x7c, 0x04, 0x78, /* m */
    0x7c, 0x08, 0x04, 0x04, 0x78, /* n */
    0x38, 0x44, 0x44, 0x44, 0x38, /* o */
    0x7c, 0x14, 0x14, 0x14, 0x08, /* p      0x70 */
    0x08, 0x14, 0x14, 0x14, 0x7c, /* q */
    0x7c, 0x08, 0x04, 0x04, 0x00, /* r */
    0x48, 0x54, 0x54, 0x54, 0x24, /* s */
    0x04, 0x04, 0x3f, 0x44, 0x44, /* t */
    0x3c, 0x40, 0x40, 0x20, 0x7c, /* u */
    0x1c, 0x20, 0x40, 0x20, 0x1c, /* v */
    0x3c, 0x40, 0x30, 0x40, 0x3c, /* w */
    0x44, 0x28, 0x10, 0x28, 0x44, /* x */
    0x0c, 0x50, 0x50, 0x50, 0x3c, /* y */
    0x44, 0x64, 0x54, 0x4c, 0x44, /* z */
    0x08, 0x36, 0x41, 0x41, 0x00, /* { */
    0x00, 0x00, 0x77, 0x00, 0x00, /* | */
    0x00, 0x41, 0x41, 0x36, 0x08, /* } */
    0x08, 0x08, 0x2a, 0x1c, 0x08  /* ~ */
};

void DisplayN18::drawCharacter(int x, int y, const char character, unsigned short foreColor, unsigned short backColor, unsigned char fontSize) {
    if (character > 126 || character < 32)
        return;

    unsigned short* horizontal = new unsigned short[DisplayN18::CHAR_HEIGHT * fontSize];
    for (int i = 0; i < DisplayN18::CHAR_WIDTH; i++) {
        for (int j = 0; j < DisplayN18::CHAR_HEIGHT; j++)
            for (int k = 0; k < fontSize; k++)
                horizontal[j * fontSize + k] = characters[(character - 32) * 5 + i] & (1 << j) ? foreColor : backColor;

        for (int k = 0; k < fontSize; k++)
            this->draw(horizontal, x + i * fontSize + k, y, 1, DisplayN18::CHAR_HEIGHT * fontSize);
    }

    for (int i = 0; i < DisplayN18::CHAR_HEIGHT; i++)
        for (int k = 0; k < fontSize; k++)
            horizontal[i * fontSize + k] = backColor;

    for (int k = 0; k < fontSize; k++)
        this->draw(horizontal, x + DisplayN18::CHAR_WIDTH * fontSize + k, y, 1, DisplayN18::CHAR_HEIGHT * fontSize);

    delete[] horizontal;
}

void DisplayN18::drawString(int x, int y, const char* str, unsigned short foreColor, unsigned short backColor, unsigned char fontSize) {
    if (*str == '\0')
        return;

    do {
        this->drawCharacter(x, y, *str, foreColor, backColor, fontSize);
        
        x += (DisplayN18::CHAR_WIDTH + DisplayN18::CHAR_SPACING) * fontSize;
    } while (*(++str) != '\0');
}