File content as of revision 1:9c5fbf92ee76:

#include "mbed.h"

SPI spi(PA_7, PA_6, PA_5);

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

#define TFT_WIDTH 320
#define TFT_HEIGHT 240

#define TFT_BLUE    0x1F00
#define TFT_RED     0x00F8
#define TFT_GREEN   0xE007

/*-------------------------------------------------------------------*/
/*  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 the windows area and 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.write(color & 0xff);
        spi.write(color >> 8);        
    }    
}

int main()
{
    spi.frequency(45000000);
    
    tft_reset();
    
    tft_clear(TFT_RED);    

    wait(1);
    
    tft_clear(TFT_GREEN);    

    wait(1);
    
    tft_clear(TFT_BLUE);    
      
    while(1);
}