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#include "maindefs.h"
#include "oled_ssd1306.h"
#include "spi.h"
#include "string.h"
#include "Adafruit_GFX.h"
#include <delays.h>

// 512 (128x32) or 1024 (128x64) bytes allocated for LCD buffer
// See linker file for details
#ifdef GFX_SSD1306
static unsigned char LCD_Buffer[SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH / 8] = {
    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, 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, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
    0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x80, 0x80, 0xC0, 0xC0, 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,
    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, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xF8, 0xE0, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80,
    0x80, 0x80, 0x00, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x00, 0xFF,
    0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x00, 0x80, 0x80, 0x00, 0x00,
    0x80, 0xFF, 0xFF, 0x80, 0x80, 0x00, 0x80, 0x80, 0x00, 0x80, 0x80, 0x80, 0x80, 0x00, 0x80, 0x80,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x80, 0x00, 0x00, 0x8C, 0x8E, 0x84, 0x00, 0x00, 0x80, 0xF8,
    0xF8, 0xF8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xE0, 0xE0, 0xC0, 0x80,
    0x00, 0xE0, 0xFC, 0xFE, 0xFF, 0xFF, 0xFF, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFF, 0xC7, 0x01, 0x01,
    0x01, 0x01, 0x83, 0xFF, 0xFF, 0x00, 0x00, 0x7C, 0xFE, 0xC7, 0x01, 0x01, 0x01, 0x01, 0x83, 0xFF,
    0xFF, 0xFF, 0x00, 0x38, 0xFE, 0xC7, 0x83, 0x01, 0x01, 0x01, 0x83, 0xC7, 0xFF, 0xFF, 0x00, 0x00,
    0x01, 0xFF, 0xFF, 0x01, 0x01, 0x00, 0xFF, 0xFF, 0x07, 0x01, 0x01, 0x01, 0x00, 0x00, 0x7F, 0xFF,
    0x80, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x7F, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x01, 0xFF,
    0xFF, 0xFF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x03, 0x0F, 0x3F, 0x7F, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xC7, 0xC7, 0x8F,
    0x8F, 0x9F, 0xBF, 0xFF, 0xFF, 0xC3, 0xC0, 0xF0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0xFC, 0xFC,
    0xFC, 0xFC, 0xFC, 0xFC, 0xFC, 0xF8, 0xF8, 0xF0, 0xF0, 0xE0, 0xC0, 0x00, 0x01, 0x03, 0x03, 0x03,
    0x03, 0x03, 0x01, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x03, 0x03, 0x01, 0x01,
    0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x03, 0x03, 0x01, 0x01, 0x03, 0x03, 0x00, 0x00,
    0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
    0x03, 0x03, 0x03, 0x03, 0x03, 0x01, 0x00, 0x00, 0x00, 0x01, 0x03, 0x01, 0x00, 0x00, 0x00, 0x03,
    0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
#if (SSD1306_LCDHEIGHT == 64)
    0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF9, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3F, 0x1F, 0x0F,
    0x87, 0xC7, 0xF7, 0xFF, 0xFF, 0x1F, 0x1F, 0x3D, 0xFC, 0xF8, 0xF8, 0xF8, 0xF8, 0x7C, 0x7D, 0xFF,
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x3F, 0x0F, 0x07, 0x00, 0x30, 0x30, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE0, 0xC0, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0xC0, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x7F, 0x3F, 0x1F,
    0x0F, 0x07, 0x1F, 0x7F, 0xFF, 0xFF, 0xF8, 0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xF8, 0xE0,
    0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00,
    0x00, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x0E, 0xFC, 0xF8, 0x00, 0x00, 0xF0, 0xF8, 0x1C, 0x0E,
    0x06, 0x06, 0x06, 0x0C, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0x00, 0x00, 0xFC,
    0xFE, 0xFC, 0x00, 0x18, 0x3C, 0x7E, 0x66, 0xE6, 0xCE, 0x84, 0x00, 0x00, 0x06, 0xFF, 0xFF, 0x06,
    0x06, 0xFC, 0xFE, 0xFC, 0x0C, 0x06, 0x06, 0x06, 0x00, 0x00, 0xFE, 0xFE, 0x00, 0x00, 0xC0, 0xF8,
    0xFC, 0x4E, 0x46, 0x46, 0x46, 0x4E, 0x7C, 0x78, 0x40, 0x18, 0x3C, 0x76, 0xE6, 0xCE, 0xCC, 0x80,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x01, 0x07, 0x0F, 0x1F, 0x1F, 0x3F, 0x3F, 0x3F, 0x3F, 0x1F, 0x0F, 0x03,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00,
    0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x03, 0x07, 0x0E, 0x0C,
    0x18, 0x18, 0x0C, 0x06, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x01, 0x0F, 0x0E, 0x0C, 0x18, 0x0C, 0x0F,
    0x07, 0x01, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00,
    0x00, 0x0F, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x0F, 0x00, 0x00, 0x00, 0x07,
    0x07, 0x0C, 0x0C, 0x18, 0x1C, 0x0C, 0x06, 0x06, 0x00, 0x04, 0x0E, 0x0C, 0x18, 0x0C, 0x0F, 0x07,
    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, 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, 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, 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, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
#endif
};
#else
static unsigned char LCD_Buffer[1];
#endif

void SSD1306_Init() {
    GFX_Init(SSD1306_LCDWIDTH, SSD1306_LCDHEIGHT);
}

void SSD1306_Begin(unsigned char vccstate) {
    // Toggle reset pin
    LATBbits.LATB6 = 0;
    Delay10KTCYx(1);
    LATBbits.LATB6 = 1;

#if defined SSD1306_128_32
    // Init sequence for 128x32 OLED module
    SSD1306_Command(SSD1306_DISPLAYOFF); // 0xAE
    SSD1306_Command(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5
    SSD1306_Command(0x80); // The suggested ratio 0x80
    SSD1306_Command(SSD1306_SETMULTIPLEX); // 0xA8
    SSD1306_Command(0x1F);
    SSD1306_Command(SSD1306_SETDISPLAYOFFSET); // 0xD3
    SSD1306_Command(0x0); // No offset
    SSD1306_Command(SSD1306_SETSTARTLINE | 0x0); // Line #0
    SSD1306_Command(SSD1306_CHARGEPUMP); // 0x8D
    if (vccstate == SSD1306_EXTERNALVCC) {
        SSD1306_Command(0x10);
    } else {
        SSD1306_Command(0x14);
    }
    SSD1306_Command(SSD1306_MEMORYMODE); // 0x20
    SSD1306_Command(0x00); // 0x0 act like ks0108
    SSD1306_Command(SSD1306_SEGREMAP | 0x1);
    SSD1306_Command(SSD1306_COMSCANDEC);
    SSD1306_Command(SSD1306_SETCOMPINS); // 0xDA
    SSD1306_Command(0x02);
    SSD1306_Command(SSD1306_SETCONTRAST); // 0x81
    SSD1306_Command(0x8F);
    SSD1306_Command(SSD1306_SETPRECHARGE); // 0xd9
    if (vccstate == SSD1306_EXTERNALVCC) {
        SSD1306_Command(0x22);
    } else {
        SSD1306_Command(0xF1);
    }
    SSD1306_Command(SSD1306_SETVCOMDETECT); // 0xDB
    SSD1306_Command(0x40);
    SSD1306_Command(SSD1306_DISPLAYALLON_RESUME); // 0xA4
    SSD1306_Command(SSD1306_NORMALDISPLAY); // 0xA6
#endif

#if defined SSD1306_128_64
    // Init sequence for 128x64 OLED module
    SSD1306_Command(SSD1306_DISPLAYOFF); // 0xAE
    SSD1306_Command(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5
    SSD1306_Command(0x80); // The suggested ratio 0x80
    SSD1306_Command(SSD1306_SETMULTIPLEX); // 0xA8
    SSD1306_Command(0x3F);
    SSD1306_Command(SSD1306_SETDISPLAYOFFSET); // 0xD3
    SSD1306_Command(0x0); // No offset
    SSD1306_Command(SSD1306_SETSTARTLINE | 0x0); // Line #0
    SSD1306_Command(SSD1306_CHARGEPUMP); // 0x8D
    if (vccstate == SSD1306_EXTERNALVCC) {
        SSD1306_Command(0x10);
    } else {
        SSD1306_Command(0x14);
    }
    SSD1306_Command(SSD1306_MEMORYMODE); // 0x20
    SSD1306_Command(0x00); // 0x0 act like ks0108
    SSD1306_Command(SSD1306_SEGREMAP | 0x1);
    SSD1306_Command(SSD1306_COMSCANDEC);
    SSD1306_Command(SSD1306_SETCOMPINS); // 0xDA
    SSD1306_Command(0x12);
    SSD1306_Command(SSD1306_SETCONTRAST); // 0x81
    if (vccstate == SSD1306_EXTERNALVCC) {
        SSD1306_Command(0x9F);
    } else {
        SSD1306_Command(0xCF);
    }
    SSD1306_Command(SSD1306_SETPRECHARGE); // 0xd9
    if (vccstate == SSD1306_EXTERNALVCC) {
        SSD1306_Command(0x22);
    } else {
        SSD1306_Command(0xF1);
    }
    SSD1306_Command(SSD1306_SETVCOMDETECT); // 0xDB
    SSD1306_Command(0x40);
    SSD1306_Command(SSD1306_DISPLAYALLON_RESUME); // 0xA4
    SSD1306_Command(SSD1306_NORMALDISPLAY); // 0xA6
#endif

    SSD1306_Command(SSD1306_DISPLAYON); // Turn on OLED panel
}

void SSD1306_Command(unsigned char cmd) {
    unsigned char c = cmd;
    LATBbits.LATB5 = 0; // D/C low (cmd)
    SPI2_Write(&c, 1);
}

void SSD1306_Data(unsigned char data) {
    unsigned char c = data;
    LATBbits.LATB5 = 1; // D/C high (data)
    SPI2_Write(&c, 1);
}

void SSD1306_Clear_Display() {
    memset(LCD_Buffer, 0, (SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8));
}

void SSD1306_Invert_Display(unsigned char c) {
    if (c) {
        SSD1306_Command(SSD1306_INVERTDISPLAY);
    } else {
        SSD1306_Command((SSD1306_NORMALDISPLAY));
    }
}

void SSD1306_Display() {
    unsigned int i;
    unsigned char c = 0;

    SSD1306_Command(SSD1306_SETLOWCOLUMN | 0x0); // low col = 0
    SSD1306_Command(SSD1306_SETHIGHCOLUMN | 0x0); // hi col = 0
    SSD1306_Command(SSD1306_SETSTARTLINE | 0x0); // line #0

    LATBbits.LATB5 = 1; // D/C high (data)
    SPI2_Write(LCD_Buffer, SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8);

//    if (SSD1306_LCDHEIGHT == 32) {
//        SPI2_Write_Repeat(0, SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8);
//    }
}

void SSD1306_Draw_Pixel(int x, int y, unsigned int color) {
    if ((x < 0) || (x >= GFX_width()) || (y < 0) || (y >= GFX_height()))
        return;

    // check rotation, move pixel around if necessary
    switch (GFX_getRotation()) {
        case 1:
            GFX_Swap(&x, &y);
            x = SSD1306_LCDWIDTH - x - 1;
            break;
        case 2:
            x = SSD1306_LCDWIDTH - x - 1;
            y = SSD1306_LCDHEIGHT - y - 1;
            break;
        case 3:
            GFX_Swap(&x, &y);
            y = SSD1306_LCDHEIGHT - y - 1;
            break;
    }

    // x is which column
    if (color == SSD1306_WHITE)
        LCD_Buffer[x + (y / 8) * SSD1306_LCDWIDTH] |= 1<<(y % 8);
    else
        LCD_Buffer[x + (y / 8) * SSD1306_LCDWIDTH] &= ~(1<<(y % 8));
}

void SSD1306_Test_DrawChar() {
    unsigned char i;
    GFX_setTextSize(1);
    GFX_setTextColor(SSD1306_WHITE);
    GFX_setCursor(0, 0);

    for (i = 0; i < 168; i++) {
        if (i == '\n') continue;
        GFX_write(i);
//        if ((i > 0) && (i % 21 == 0))
//            GFX_write('\n');
    }
    SSD1306_Display();
}

void SSD1306_Test_DrawCircle() {
    int i;
    for (i = 0; i < GFX_height(); i += 2) {
        GFX_drawCircle(GFX_width() / 2, GFX_height() / 2, i, SSD1306_WHITE);
        SSD1306_Display();
    }
}

void SSD1306_Test_DrawRect(void) {
    int i;
    for (i = 0; i < GFX_height() / 2; i += 2) {
        GFX_drawRect(i, i, GFX_width() - 2 * i, GFX_height() - 2 * i, SSD1306_WHITE);
        SSD1306_Display();
    }
}

void SSD1306_Test_FillRect(void) {
    unsigned char color = 1;
    int i;
    for (i = 0; i < GFX_height() / 2; i += 3) {
        // alternate colors
        GFX_fillRect(i, i, GFX_width() - i * 2, GFX_height() - i * 2, color % 2);
        SSD1306_Display();
        color++;
    }
}

void SSD1306_Test_DrawTriangle(void) {
    int i;
    int min = GFX_width() < GFX_height() ? GFX_width() : GFX_height();
    for (i = 0; i < min / 2; i += 5) {
        GFX_drawTriangle(GFX_width() / 2, GFX_height() / 2 - i,
                GFX_width() / 2 - i, GFX_height() / 2 + i,
                GFX_width() / 2 + i, GFX_height() / 2 + i, SSD1306_WHITE);
        SSD1306_Display();
    }
}

void SSD1306_Test_FillTriangle(void) {
    unsigned char color = SSD1306_WHITE;
    int i;
    int min = GFX_width() < GFX_height() ? GFX_width() : GFX_height();
    for (i = min / 2; i > 0; i -= 5) {
        GFX_fillTriangle(GFX_width() / 2, GFX_height() / 2 - i,
                GFX_width() / 2 - i, GFX_height() / 2 + i,
                GFX_width() / 2 + i, GFX_height() / 2 + i, SSD1306_WHITE);
        if (color == SSD1306_WHITE) color = SSD1306_BLACK;
        else color = SSD1306_WHITE;
        SSD1306_Display();
    }
}

void SSD1306_Test_DrawRoundRect(void) {
    int i;
    for (i = 0; i < GFX_height() / 2 - 2; i += 2) {
        GFX_drawRoundRect(i, i, GFX_width() - 2 * i, GFX_height() - 2 * i, GFX_height() / 4, SSD1306_WHITE);
        SSD1306_Display();
    }
}

void SSD1306_Test_FillRoundRect(void) {
    unsigned char color = SSD1306_WHITE;
    int i;
    for (i = 0; i < GFX_height() / 2 - 2; i += 2) {
        GFX_fillRoundRect(i, i, GFX_width() - 2 * i, GFX_height() - 2 * i, GFX_height() / 4, color);
        if (color == SSD1306_WHITE) color = SSD1306_BLACK;
        else color = SSD1306_WHITE;
        SSD1306_Display();
    }
}

void SSD1306_Test_DrawLine(void) {
    int i;
    for (i = 0; i < GFX_width(); i += 4) {
        GFX_drawLine(0, 0, i, GFX_height() - 1, SSD1306_WHITE);
        SSD1306_Display();
    }
    for (i = 0; i < GFX_height(); i += 4) {
        GFX_drawLine(0, 0, GFX_width() - 1, i, SSD1306_WHITE);
        SSD1306_Display();
    }
    Delay10KTCYx(255);

    SSD1306_Clear_Display();
    for (i = 0; i < GFX_width(); i += 4) {
        GFX_drawLine(0, GFX_height() - 1, i, 0, SSD1306_WHITE);
        SSD1306_Display();
    }
    for (i = GFX_height() - 1; i >= 0; i -= 4) {
        GFX_drawLine(0, GFX_height() - 1, GFX_width() - 1, i, SSD1306_WHITE);
        SSD1306_Display();
    }
    Delay10KTCYx(255);

    SSD1306_Clear_Display();
    for (i = GFX_width() - 1; i >= 0; i -= 4) {
        GFX_drawLine(GFX_width() - 1, GFX_height() - 1, i, 0, SSD1306_WHITE);
        SSD1306_Display();
    }
    for (i = GFX_height() - 1; i >= 0; i -= 4) {
        GFX_drawLine(GFX_width() - 1, GFX_height() - 1, 0, i, SSD1306_WHITE);
        SSD1306_Display();
    }
    Delay10KTCYx(255);

    SSD1306_Clear_Display();
    for (i = 0; i < GFX_height(); i += 4) {
        GFX_drawLine(GFX_width() - 1, 0, 0, i, SSD1306_WHITE);
        SSD1306_Display();
    }
    for (i = 0; i < GFX_width(); i += 4) {
        GFX_drawLine(GFX_width() - 1, 0, i, GFX_height() - 1, SSD1306_WHITE);
        SSD1306_Display();
    }
    Delay10KTCYx(255);
}