File content as of revision 1:993a4757891d:

/* ILI9340C
For use with Arduino Lib Ported for mbed */

#include "mbed.h"
#include "ILI9340_Driver.h"
#include "SimpleFont.cpp"

// Constructor, assigns the pins to the SPI object, set orientation, and sets screen dims.
ILI9340_Display::ILI9340_Display(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName rst, PinName dc)
    : spi(mosi, miso, sclk), cs(cs), rst(rst), dc(dc)
{
    _height = _TFTHEIGHT;
    _width = _TFTWIDTH;
    orientation = 0;
}

// Command writing code
void ILI9340_Display::WriteCommand(uint8_t command)
{
    dc = 0;
    cs = 0;
    spi.write(command);
    cs = 1;
}

// Data writing code
void ILI9340_Display::WriteData(uint8_t data)
{
    cs = 0;
    dc = 1;
    spi.write(data);
    cs = 1;
}


// Initilise the display
void ILI9340_Display::DispInit(void)
{
    //CtrlOutput();

    rst = 0;

    // Setup the spi for 8 bit data, high steady state clock,
    // second edge capture, with a 1MHz clock rate
    //spi.format(8,3);
    spi.frequency(24000000); // actually seems to work up to about 20Mhz... way better than the 8mhz as std.

    // Toggle rst to reset
    rst = 1;
    wait(0.005);
    rst = 0;
    wait(0.020);
    rst = 1;
    wait(0.150);

    WriteCommand(0xEF);
    WriteData(0x03);
    WriteData(0x80);
    WriteData(0x02);

    WriteCommand(0xCF);
    WriteData(0x00);
    WriteData(0xC1);
    WriteData(0x30);

    WriteCommand(0xED);
    WriteData(0x64);
    WriteData(0x03);
    WriteData(0x12);
    WriteData(0x81);

    WriteCommand(0xE8);
    WriteData(0x85);
    WriteData(0x00);
    WriteData(0x78);

    WriteCommand(0xCB);
    WriteData(0x39);
    WriteData(0x2C);
    WriteData(0x00);
    WriteData(0x34);
    WriteData(0x02);

    WriteCommand(0xF7);
    WriteData(0x20);

    WriteCommand(0xEA);
    WriteData(0x00);
    WriteData(0x00);

    WriteCommand(ILI9340_PWCTR1);    //Power control
    WriteData(0x23);   //VRH[5:0]

    WriteCommand(ILI9340_PWCTR2);    //Power control
    WriteData(0x10);   //SAP[2:0];BT[3:0]

    WriteCommand(ILI9340_VMCTR1);    //VCM control
    WriteData(0x3e); //�Աȶȵ���
    WriteData(0x28);

    WriteCommand(ILI9340_VMCTR2);    //VCM control2
    WriteData(0x86);  //--

    WriteCommand(ILI9340_MADCTL);    // Memory Access Control
    WriteData(ILI9340_MADCTL_MX | ILI9340_MADCTL_BGR);

    WriteCommand(ILI9340_PIXFMT);
    WriteData(0x55);

    WriteCommand(ILI9340_FRMCTR1);
    WriteData(0x00);
    WriteData(0x18);

    WriteCommand(ILI9340_DFUNCTR);    // Display Function Control
    WriteData(0x08);
    WriteData(0x82);
    WriteData(0x27);

    WriteCommand(0xF2);    // 3Gamma Function Disable
    WriteData(0x00);

    WriteCommand(ILI9340_GAMMASET);    //Gamma curve selected
    WriteData(0x01);

    WriteCommand(ILI9340_GMCTRP1);    //Set Gamma
    WriteData(0x0F);
    WriteData(0x31);
    WriteData(0x2B);
    WriteData(0x0C);
    WriteData(0x0E);
    WriteData(0x08);
    WriteData(0x4E);
    WriteData(0xF1);
    WriteData(0x37);
    WriteData(0x07);
    WriteData(0x10);
    WriteData(0x03);
    WriteData(0x0E);
    WriteData(0x09);
    WriteData(0x00);

    WriteCommand(ILI9340_GMCTRN1);    //Set Gamma
    WriteData(0x00);
    WriteData(0x0E);
    WriteData(0x14);
    WriteData(0x03);
    WriteData(0x11);
    WriteData(0x07);
    WriteData(0x31);
    WriteData(0xC1);
    WriteData(0x48);
    WriteData(0x08);
    WriteData(0x0F);
    WriteData(0x0C);
    WriteData(0x31);
    WriteData(0x36);
    WriteData(0x0F);

    WriteCommand(ILI9340_SLPOUT);    //Exit Sleep
    wait(0.120);
    WriteCommand(ILI9340_DISPON);    //Display on

}


// Sets the rotation of the display
void ILI9340_Display::SetRotation(uint8_t m)
{

    WriteCommand(ILI9340_MADCTL);
    orientation = m % 4; // can't be higher than 3

    switch (orientation) {
        case 0:
            WriteData(ILI9340_MADCTL_MX | ILI9340_MADCTL_BGR);
            _width  = _TFTWIDTH;
            _height = _TFTHEIGHT;
            break;
        case 1:
            WriteData(ILI9340_MADCTL_MV | ILI9340_MADCTL_BGR);
            _width  = _TFTHEIGHT;
            _height = _TFTWIDTH;
            break;
        case 2:
            WriteData(ILI9340_MADCTL_MY | ILI9340_MADCTL_BGR);
            _width  = _TFTWIDTH;
            _height = _TFTHEIGHT;
            break;
        case 3:
            WriteData(ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX | ILI9340_MADCTL_BGR);
            _width  = _TFTHEIGHT;
            _height = _TFTWIDTH;
            break;
    }
}

// Invert the colours of the display in hardware
void ILI9340_Display::InvertDisplay(bool i)
{
    WriteCommand(i ? ILI9340_INVON : ILI9340_INVOFF);
}

// Set address window for writing data to.
void ILI9340_Display::SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1)
{
    WriteCommand(ILI9340_CASET); // Column addr set
    WriteData(x0 >> 8);
    WriteData(x0 & 0xFF);     // XSTART
    WriteData(x1 >> 8);
    WriteData(x1 & 0xFF);     // XEND
    WriteCommand(ILI9340_PASET); // Row addr set
    WriteData(y0>>8);
    WriteData(y0);     // YSTART
    WriteData(y1>>8);
    WriteData(y1);     // YEND

    WriteCommand(ILI9340_RAMWR); // write to RAM
}

// To draw the humble pixel
void ILI9340_Display::DrawPixel(uint16_t x, uint16_t y, uint16_t colour)
{
    if((x < 1) ||(x >= _width) || (y < 1) || (y >= _height)) return;

    SetAddrWindow(x,y,x+1,y+1);

    dc = 1;
    cs = 0;

    spi.write(colour >> 8);
    spi.write(colour);

    cs = 1;
}

// Fill the screen with a colour
void ILI9340_Display::FillScreen(uint16_t colour)
{
    SetAddrWindow(0,0,_width,_height);

    dc = 1;
    cs = 0;

    unsigned int total = _width * _height;
    unsigned int position = 0;

    while (position < total) {
        spi.write(colour >> 8);
        spi.write(colour);
        position++;
    }
    cs = 1;
}

// Draws a vertical line fast
void ILI9340_Display::DrawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t colour)
{
    // Rudimentary clipping
    if((x >= _width) || (y >= _height)) return;
    if((y+h-1) >= _height)
        h = _height-y;

    SetAddrWindow(x, y, x, y+h-1);

    uint8_t hi = colour >> 8, lo = colour;
    dc = 1;
    cs = 0;

    while (h--) {
        spi.write(hi);
        spi.write(lo);
    }
    cs = 1;
}

// Draws a horizontal line fast
void ILI9340_Display::DrawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t colour)
{

    // Rudimentary clipping
    if((x >= _width) || (y >= _height)) return;
    if((x+w-1) >= _height)  w = _width-x;
    SetAddrWindow(x, y, x+w-1, y);

    uint8_t hi = colour >> 8, lo = colour;
    dc = 1;
    cs = 0;
    while (w--) {
        spi.write(hi);
        spi.write(lo);
    }
    cs = 1;
}

// Draws a filled rectangle
void ILI9340_Display::FillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t colour)
{

    // rudimentary clipping (drawChar w/big text requires this)
    if((x >= _width) || (y >= _height)) return;
    if((x + w - 1) >= _width)  w = _width  - x;
    if((y + h - 1) >= _height) h = _height - y;

    SetAddrWindow(x, y, x+w-1, y+h-1);

    uint8_t hi = colour >> 8, lo = colour;

    dc = 1;
    cs = 0;

    for(y=h; y>0; y--) {
        for(x=w; x>0; x--) {
            spi.write(hi);
            spi.write(lo);
        }
    }
    cs = 1;
}

// Draw an unfilled rectangle
void ILI9340_Display::DrawRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
{
    DrawFastHLine(x, y, w, color);
    DrawFastHLine(x, y+h-1, w, color);
    DrawFastVLine(x, y, h, color);
    DrawFastVLine(x+w-1, y, h, color);
}

// draw an unfilled circle
void ILI9340_Display::DrawCircle(int16_t x0, int16_t y0, int16_t r, uint16_t colour)
{
    int16_t f = 1 - r;
    int16_t ddF_x = 1;
    int16_t ddF_y = -2 * r;
    int16_t x = 0;
    int16_t y = r;

    DrawPixel(x0  , y0+r, colour);
    DrawPixel(x0  , y0-r, colour);
    DrawPixel(x0+r, y0  , colour);
    DrawPixel(x0-r, y0  , colour);

    while (x<y) {
        if (f >= 0) {
            y--;
            ddF_y += 2;
            f += ddF_y;
        }
        x++;
        ddF_x += 2;
        f += ddF_x;

        DrawPixel(x0 + x, y0 + y, colour);
        DrawPixel(x0 - x, y0 + y, colour);
        DrawPixel(x0 + x, y0 - y, colour);
        DrawPixel(x0 - x, y0 - y, colour);
        DrawPixel(x0 + y, y0 + x, colour);
        DrawPixel(x0 - y, y0 + x, colour);
        DrawPixel(x0 + y, y0 - x, colour);
        DrawPixel(x0 - y, y0 - x, colour);
    }
}

// Pass 8-bit (each) R,G,B, get back 16-bit packed color
uint16_t ILI9340_Display::Colour565(uint8_t r, uint8_t g, uint8_t b)
{
    return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);
}

// Writes an ascii character to the display
void ILI9340_Display::DrawAscii(unsigned char ascii, uint16_t x, uint16_t y, uint16_t size, uint16_t colour)
{
    SetAddrWindow(x, y, x+size, y+size);

    if( (ascii < 0x20) || (ascii > 0x7e) ) {    //check for valid ASCII char
        ascii = '?';                            //char not supported
    }
    for(unsigned char i=0; i<8; i++) {
        unsigned char temp = simpleFont[ascii - 0x20][i];
        for(unsigned char f=0; f<8; f++) {
            if( (temp>>f) & 0x01 ) {
                switch(orientation) {
                    case '0':
                        FillRect(x+f*size, y-i*size, size, size, colour);
                        break;
                    case '1':
                        FillRect(x-i*size, x-f*size, size, size, colour);
                        break;
                    case '2':
                        FillRect(x-f*size, y+i*size, size, size, colour);
                        break;
                    case '3':
                    default:
                        FillRect(x+i*size, y+f*size, size, size, colour);
                }
            }
        }
    }
}

// Writes a character array to the display
void ILI9340_Display::DrawString(char *string, uint16_t x, uint16_t y, uint8_t size, uint16_t colour)
{
    while(*string) {
        DrawAscii(*string, x, y, size, colour);
        *string++;
        switch(orientation) {
            case '0':
                if(y > 0) y-=8*size;              //Change position to next char
                break;
            case '1':
                if(x > 0) x-=8*size;
                break;
            case '2':
                if(y < _height) y+=8*size;
                break;
            case '3':
            default:
                if(x < _width) x+=8*size;
        }
    }
}

// Converts integers into a character array
void ILI9340_Display::IntToChars (char* buffer, int value, uint8_t spaceonbuffer, uint8_t countbase, uint16_t x, uint16_t y, uint8_t size, uint16_t colour)
{
    int workvalue = value;
    int i;
    int valuetowrite;
    int  end_i = 0;

    if (value < 0) {
        workvalue = -value;
        end_i = 1;
        buffer[0] = '-';
    }

    for (i = spaceonbuffer - 1; i >= end_i; i--) {
        valuetowrite = (workvalue % countbase);
        if (workvalue == 0) {
            if (i == (spaceonbuffer - 1)) {
                buffer[i] = 48;                        // ASCII 0
            } else {
                buffer[i] = 32;                        // ASCII SPACE
            }
        } else {
            if (valuetowrite > 9) {
                buffer[i] = valuetowrite + 55;        // ASCII A-Z
            } else {
                buffer[i] = valuetowrite + 48;        // ASCII of that character
            }
        };
        workvalue = (workvalue - valuetowrite) / countbase;
    }

    DrawString(buffer, x, y, size, colour);
}

// Functional code to swap data contents of 16bit registers
void ILI9340_Display::Swap(int16_t *a, int16_t *b)
{

    int16_t x = *a;
    *a = *b;
    *b = x;
}

// Draws a line with any length and orientation
void ILI9340_Display::DrawLine(int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t colour)
{
    int16_t steep = abs(y1 - y0) > abs(x1 - x0);
    if (steep) {
        Swap(&x0, &y0);
        Swap(&x1, &y1);
    }

    if (x0 > x1) {
        Swap(&x0, &x1);
        Swap(&y0, &y1);
    }

    int16_t dx, dy;
    dx = x1 - x0;
    dy = abs(y1 - y0);

    int16_t err = dx / 2;
    int16_t ystep;

    if (y0 < y1) {
        ystep = 1;
    } else {
        ystep = -1;
    }

    for (; x0<=x1; x0++) {
        if (steep) {
            DrawPixel(y0, x0, colour);
        } else {
            DrawPixel(x0, y0, colour);
        }
        err -= dy;
        if (err < 0) {
            y0 += ystep;
            err += dx;
        }
    }
}