File content as of revision 0:3dac1f1bc9e0:

/*===================================================================*/
/*                                                                   */
/*  tft.cpp : TFT(ILI9341) function                                  */
/*                                                                   */
/*  2016/1/20  Racoon                                                */
/*                                                                   */
/*===================================================================*/

#include "mbed.h"
#include "tft.h"

DigitalOut cs(PB_5, PullUp); // TFT chipselect pin
DigitalOut dc(PA_8, PullUp); // TFT data command select pin
DigitalOut rst(PA_10,PullUp); // TFT reset pin

/*-------------------------------------------------------------------*/
/*  Write command                                                    */
/*-------------------------------------------------------------------*/
void write_cmd(uint8_t cmd)
{
    dc = 0;
    spi_write(cmd);
}
  
/*-------------------------------------------------------------------*/
/*  Write data                                                       */
/*-------------------------------------------------------------------*/
void write_data(uint8_t data)
{
    dc = 1;
    spi_write(data);
}

/*-------------------------------------------------------------------*/
/*  TFT reset                                                        */
/*-------------------------------------------------------------------*/
void tft_reset()
{
    wait_ms(200);
    cs = 1;
    dc = 1;
    rst = 1;
    wait_ms(200);
    rst = 0;
    wait_us(10);
    rst = 1;
    wait_ms(120);
    cs = 0;
    wait_ms(10);
        
    write_cmd(0x3A); // Pixel Format    
    write_data(0x55); // 16bit Color
    
    write_cmd(0xB1); // Frame Control    
    write_data(0);
    write_data(0x1f);
        
    write_cmd(0x36); // Memory Access Control 
    write_data(0xE8); // MY MX MV BGR

    write_cmd(0x11); // Sleep Out
    wait_ms(5);
        
    write_cmd(0x29); // Display On    
}

/*-------------------------------------------------------------------*/
/*  Set windows size, start memory write                             */
/*-------------------------------------------------------------------*/
void tft_set_window(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1)
{
  write_cmd(0x2A); // Column Address Set
  write_data(x0 >> 8);
  write_data(x0);
  write_data(x1 >> 8);
  write_data(x1);

  write_cmd(0x2B); // Page Address Set
  write_data(y0 >> 8);
  write_data(y0);
  write_data(y1 >> 8);
  write_data(y1);

  write_cmd(0x2C); // Memory Write
  
  wait_us(20);
  
  dc = 1;
}

/*-------------------------------------------------------------------*/
/*  Clear screen                                                     */
/*-------------------------------------------------------------------*/
void tft_clear(uint16_t color)
{
    tft_set_window(0, 0, TFT_WIDTH, TFT_HEIGHT);

    for (int i = 0; i < TFT_WIDTH * TFT_HEIGHT; ++i)
    {
        spi_writew(color);
    }    
}

/*-------------------------------------------------------------------*/
/*  Put char                                                         */
/*-------------------------------------------------------------------*/
void tft_put_char(int x, int y, char chr, uint16_t color, uint16_t bgcolor)
{
    if (chr < 0x20 || chr > 0x7f)
    {
        chr = 0x3f;
    }
    else
    {
        chr = (chr < 0x60) ? chr - 0x20 : chr - 0x40;
    }
        
    tft_set_window(x, y, x + 7, y + 6);
    
    for (int dy = 0; dy < 7; ++dy)
    {
        unsigned char img = chrimg[chr][dy];
        for ( int dx = 0; dx < 8; ++dx)
        {
            if (img & 0x80)
            {
                spi_writew(color);
            }
            else
            {
                spi_writew(bgcolor);                
            }
            img <<= 1;
        }
    }    
    
}
 
/*-------------------------------------------------------------------*/
/*  Text out                                                         */
/*-------------------------------------------------------------------*/
void tft_text(int x, int y, char *text, uint16_t color, uint16_t bgcolor)
{
    while (*text != 0)
    {
        tft_put_char(x, y, *text, color, bgcolor);
        x += 8;
        text++;
    }
}

/*-------------------------------------------------------------------*/
/*  Horizontal Line                                                        */
/*-------------------------------------------------------------------*/
void tft_hline(int x1, int y, int x2, uint16_t color)
{
    tft_set_window(x1, y, x2, y);
    
    for (;x1 < x2; ++x1)
    {
        spi_writew(color);
    }
}

/*-------------------------------------------------------------------*/
/*  Vertical Line                                                        */
/*-------------------------------------------------------------------*/
void tft_vline(int x, int y1, int y2, uint16_t color)
{
    tft_set_window(x, y1, x, y2);
    
    for (;y1 < y2; ++y1)
    {
        spi_writew(color);
    }
}

/*-------------------------------------------------------------------*/
/*  Box                                                              */
/*-------------------------------------------------------------------*/
void tft_box(int x1, int y1, int x2, int y2, uint16_t color)
{
    tft_hline(x1, y1, x2, color);
    tft_vline(x1, y1, y2, color);
    tft_vline(x2, y1, y2, color);
    tft_hline(x1, y2, x2, color);
}

/*-------------------------------------------------------------------*/
/*  Box Fill                                                        */
/*-------------------------------------------------------------------*/
void tft_boxfill(int x1, int y1, int x2, int y2, uint16_t color)
{
    tft_set_window(x1, y1, x2, y2);
    
    for (int i = 0; i < (x2 - x1 + 1) * (y2 - y1 + 1); ++i)
    {
        spi_writew(color);
    }
}

/*-------------------------------------------------------------------*/
/*  Draw 4bit BMP                                                    */
/*-------------------------------------------------------------------*/
bool draw_bmp_4bpp(const unsigned char *imgdata, int x, int y)
{
    BITMAPFILEHEADER *bf = (BITMAPFILEHEADER *)imgdata;
    BITMAPINFOHEADER *bi = (BITMAPINFOHEADER *)(imgdata + sizeof(BITMAPFILEHEADER));
       
    if (bi->biBitCount != 4)
    {
        return false;
    }

    unsigned char *pRGBPal = (unsigned char*)imgdata + sizeof(BITMAPFILEHEADER) + bi->biSize;
    unsigned short palette[16];

    for (int i = 0; pRGBPal < imgdata + bf->bfOffBits && i < 16; ++i)
    {
        unsigned short r,g,b;  
        b = *pRGBPal++ >> 3;
        g = *pRGBPal++ >> 2;
        r = *pRGBPal++ >> 3;
        pRGBPal++;
        palette[i] = ((g & 7) << 13) | (b << 8) | (r << 3) | (g >> 3);
    }

    unsigned short HLine[320];
    int linesize = (bi->biWidth / 2 + 3) & 0xfffc;
        
    tft_set_window(x, y, x + bi->biWidth - 1, y + bi->biHeight - 1);
    
    unsigned char *bmp;
    
    for (int y = bi->biHeight - 1; y >= 0; --y)
    {
        bmp = (unsigned char *)imgdata + bf->bfOffBits + y * linesize; 
        
        for (int x = 0; x < bi->biWidth; ++x)
        {
            char pal;
            if (x & 1)
            {
                pal = *bmp & 0xf;
                bmp++;
            }
            else
            {
                pal = *bmp >> 4;
            }
                
            HLine[x] = palette[pal];
        }
    
        HAL_SPI_Transmit(&SpiHandle, (uint8_t *)HLine, bi->biWidth * 2, 100);
    }

    return true;
}
  
/*-------------------------------------------------------------------*/
/*  Initialize TFT                                                   */
/*-------------------------------------------------------------------*/
void tft_init(void)
{
    spi_init();
        
    tft_reset();
}