// Jack: External font chip use
    bool ext_font_used;
    unsigned int ext_font_type;
    unsigned int ext_font_size;
    unsigned int ext_font_height;

// Jack: Enable external font chip
void RA8875::SetExtFontType(unsigned int Font)
{
    // Font 0...2
    // Size 0...2
    ext_font_used = true;
    ext_font_type = Font;
    WriteCommand(0x21, (unsigned int)0x20);
    WriteCommand(0x2f, (unsigned int)0x80 + Font);
}

// Jack: Enable external font chip
void RA8875::SetExtFontSize(unsigned int Size)
{
    // Font 0...2
    // Size 0...2
    ext_font_used = true;
    ext_font_size = Size;
    WriteCommand(0x21, (unsigned int)0x20);
    if (Size == 0) {
        WriteCommand(0x2e, (unsigned int)0x00); // 0x00 0x20 (5:0) Horizontal spacing between characters
        ext_font_height = 16;
    }
    if (Size == 1) {
        WriteCommand(0x2e, (unsigned int)0x40); // 0x00 0x20 (5:0) Horizontal spacing between characters
        ext_font_height = 24;
    }
    if (Size == 2) {
        WriteCommand(0x2e, (unsigned int)0x80); // 0x00 0x20 (5:0) Horizontal spacing between characters
        ext_font_height = 32;
    }
}

// Jack: Disable external font chip
void RA8875::SetIntFont(void)
{
    ext_font_used = false;
    WriteCommand(0x21, (unsigned int)0x00);
    WriteCommand(0x2e, (unsigned int)0x00);
    WriteCommand(0x2f, (unsigned int)0x00);
}

RetCode_t RA8875::init(int width, int height, int color_bpp, bool poweron, bool keypadon, bool touchscreenon)
{
    font = NULL;                        // no external font, use internal.
    pKeyMap = DefaultKeyMap;            // set default key map
    _select(false);                      // deselect the display
    frequency(RA8875_DEFAULT_SPI_FREQ); // data rate
    Reset();
    WriteCommand(0x88, 0x0B);                   // PLLC1 - Phase Lock Loop registers
    wait_ms(1);
    WriteCommand(0x89, 0x02);
    wait_ms(1);

    // System Config Register (SYSR)
    if (color_bpp == 16) {
        WriteCommand(0x10, 0x0C);               // 16-bpp (65K colors) color depth, 8-bit interface
    } else { // color_bpp == 8
        WriteCommand(0x10, 0x00);               // 8-bpp (256 colors)
    }
    // Pixel Clock Setting Register (PCSR)
    WriteCommand(0x04, 0x82);                   // PDAT on PCLK falling edge, PCLK = 4 x System Clock
    wait_ms(1);

    // Horizontal Settings
    screenwidth = width;
    WriteCommand(0x14, width/8 - 1);            //HDWR//Horizontal Display Width Setting Bit[6:0]
    WriteCommand(0x15, 0x02);                   //HNDFCR//Horizontal Non-Display Period fine tune Bit[3:0]
    WriteCommand(0x16, 0x03);                   //HNDR//Horizontal Non-Display Period Bit[4:0]
    WriteCommand(0x17, 0x01);                   //HSTR//HSYNC Start Position[4:0]
    WriteCommand(0x18, 0x03);                   //HPWR//HSYNC Polarity ,The period width of HSYNC.

    // Vertical Settings
    screenheight = height;
    WriteCommand(0x19, (height-1)&0xFF);        //VDHR0 //Vertical Display Height Bit [7:0]
    WriteCommand(0x1a, (height-1)>>8);          //VDHR1 //Vertical Display Height Bit [8]
    WriteCommand(0x1b, 0x0F);                   //VNDR0 //Vertical Non-Display Period Bit [7:0]
    WriteCommand(0x1c, 0x00);                   //VNDR1 //Vertical Non-Display Period Bit [8]
    WriteCommand(0x1d, 0x0e);                   //VSTR0 //VSYNC Start Position[7:0]
    WriteCommand(0x1e, 0x06);                   //VSTR1 //VSYNC Start Position[8]
    WriteCommand(0x1f, 0x01);                   //VPWR //VSYNC Polarity ,VSYNC Pulse Width[6:0]

    if (width >= 800 && height >= 480 && color_bpp > 8) {
        WriteCommand(0x20, 0x00);               // DPCR - 1-layer mode when the resolution is too high
    } else {
        WriteCommand(0x20, 0x80);               // DPCR - 2-layer mode
    }

    // Set display image to Blue on Black as default
    window(0,0, width, height);             // Initialize to full screen
    SetTextCursorControl();
    foreground(Blue);
    background(Black);
    cls(3);

    // Jack: external font used
    ext_font_used = false;
    ext_font_type = 0;
    ext_font_size = 0;
    ext_font_height = 16;

    Power(poweron);
    if (poweron)
        Backlight_u8(255);
    if (keypadon)
        KeypadInit();
    if (touchscreenon)
        TouchPanelInit();
#ifdef PERF_METRICS
    performance.start();
    ClearPerformance();
#endif
    return noerror;
}

int RA8875::_internal_putc(int c)
{
    if (c) {
        unsigned char mwcr0;

        mwcr0 = ReadCommand(0x40);
        if ((mwcr0 & 0x80) == 0x00) {
            WriteCommand(0x40, 0x80 | mwcr0);    // Put in Text mode if not already
        }
        if (c == '\r') {
            loc_t x;
            x = ReadCommand(0x30) | (ReadCommand(0x31) << 8);   // Left edge of active window
            WriteCommandW(0x2A, x);
        } else if (c == '\n') {
            loc_t y;
            y = ReadCommand(0x2C) | (ReadCommand(0x2D) << 8);   // current y location
            // Jack: external font support
            if (ext_font_used) {
                y += ext_font_height; 
            }
            else {
                y += fontheight(); 
            }
            if (y >= height())               // @TODO after bottom of active window, then scroll window?
                y = 0;
            WriteCommandW(0x2C, y);
        } else {
            WriteCommand(0x02);                 // RA8875 Internal Fonts
            _select(true);
            WriteData(c);
            _WaitWhileBusy(0x80);
            _select(false);
        }
    }
    return c;
}