Lib for FTDI FT800 graphic controller "EVE" The API is changed from the FTDI original names. It use smaller names now. DL() will add something to the display list instead of Ft_App_WrCoCmd_Buffer ... The FTDI programmer Guide is also using this commands.

Dependents:   FT800_RGB_demo FT800_RGB_demo2 FT800_demo_for_habr Temp_&_RH_at_TFT-demo ... more

Fork of FT800 by Peter Drescher

The mbed is talking thru the SPI interface with the graphic engine. We have to set up a list of Commands and send them to the FT800 to get graphics.


1. VM800C development modules from FTDI :

The modules come with different size lcd. 3.5", 4.3" or 5" or without. /media/uploads/dreschpe/ftdi_eve.jpg The picture shows a modified board, because my lcd had a different pinout. The mbed is connected to the pin header on the bottom.

2. EVBEVE-FT800 board from GLYN:

The module has a 40 pin flex cable connector to connect a display out of the EDT series.


The mbed is connected via the pin header on the left. If you use this board with a EDT display you have to uncomment the #define Inv_Backlite in FT_LCD_Type.h, because the backlight dimming is inverted.

3. ConnectEVE board from MikroElektronika The board has also a pin header to connect the mbed. - not tested, but it looks like the other boards.

4. ADAM arduino shield Component page :

Works with the NUCLEO boards, but you have to patch three wires.



We need 5 signals to connect to the mbed. SCK, MOSI and MISO are connected to a SPI channel. SS is the chip select signal and PD work as powerdown. The additional INT signal is not used at the moment. It is possible to generate a interrupt signal, but at the moment you have to poll the status register of the FT800 to see if a command is finished.


This lib is based on the demo code from FTDI. If you want to use it, you have to read the programming manual :

See my demo :



File content as of revision 6:16e22c789f7d:

#include "FT_Platform.h"
#include "mbed.h"

/* function to load jpg file from filesystem */
/* return 0 if jpg is ok                     */
/* return x_size and y_size of jpg           */

int FT800::Load_jpg(char* filename, ft_int16_t* x_size, ft_int16_t* y_size)
    unsigned char pbuff[8291];
    unsigned short marker;
    unsigned short length;
    unsigned char data[4];

    ft_uint16_t blocklen;

    FILE *fp = fopen(filename, "r");
    if(fp == NULL) return (-1);         // connot open file

    // search for 0xFFC0 marker
    fseek(fp, 0, SEEK_END);
    unsigned int Fsize = ftell(fp);
    fseek(fp, 2, SEEK_SET);
    marker = data[0] << 8 | data[1];
    length = data[2] << 8 | data[3];
    do {
        if(marker == 0xFFC0) break;
        if(marker & 0xFF00 != 0xFF00) break;
        if (fseek(fp, length - 2,SEEK_CUR) != 0) break;
        marker = data[0] << 8 | data[1];
        length = data[2] << 8 | data[3];
    } while(1);
    if(marker != 0xFFC0) return (-2);  // no FFC0 Marker, wrong format no baseline DCT-based JPEG
    fseek(fp, 1,SEEK_CUR);
    *y_size = (data[0] << 8 | data[1]);
    *x_size = (data[2] << 8 | data[3]);

    //if(*x_size > DispWidth || *y_size > DispHeight) return (-3);  // to big to fit on screen

    fseek(fp, 0, SEEK_SET);
    WrCmd32(CMD_LOADIMAGE);  // load a JPEG image
    WrCmd32(0);              //destination address of jpg decode
    WrCmd32(0);              //output format of the bitmap - default is rgb565
    while(Fsize > 0) {
        /* download the data into the command buffer by 8kb one shot */
        blocklen = Fsize>8192?8192:Fsize;
        /* copy the data into pbuff and then transfter it to command buffer */
        Fsize -= blocklen;
        /* copy data continuously into command memory */
        WrCmdBuf(pbuff, blocklen); //alignment is already taken care by this api


/* calibrate touch */
ft_void_t FT800::Calibrate()
    /* Below code demonstrates the usage of calibrate function. Calibrate    */
    /* function will wait untill user presses all the three dots. Only way to*/
    /* come out of this api is to reset the coprocessor bit.                 */

        DLstart();                                       // start a new display command list
        DL(CLEAR_COLOR_RGB(64,64,64));       // set the clear color R, G, B
        DL(CLEAR(1,1,1));                    // clear buffers -> color buffer,stencil buffer, tag buffer
        DL(COLOR_RGB(0xff,0xff,0xff));       // set the current color R, G, B
        Text((DispWidth/2), (DispHeight/2), 27, OPT_CENTER, "Please Tap on the dot");  // draw Text at x,y, font 27, centered
        Calibrate(0);                                    // start the calibration of touch screen
        Flush_Co_Buffer();                               // download the commands into FT800 FIFO
        WaitCmdfifo_empty();                             // Wait till coprocessor completes the operation

/* API to give fadeout effect by changing the display PWM from 100 till 0 */
ft_void_t FT800::fadeout()
   ft_int32_t i;
    for (i = 100; i >= 0; i -= 3) 
        Sleep(2);//sleep for 2 ms

/* API to perform display fadein effect by changing the display PWM from 0 till 100 and finally 128 */
ft_void_t FT800::fadein()
    ft_int32_t i;
    for (i = 0; i <=100 ; i += 3) 
        Sleep(2);//sleep for 2 ms
    /* Finally make the PWM 100% */
    i = 128;

ft_void_t FT800::read_calibrate(ft_uint8_t data[24]){
    unsigned int i;
        data[i] = Rd8(REG_TOUCH_TRANSFORM_A + i);

ft_void_t FT800::write_calibrate(ft_uint8_t data[24]){
    unsigned int i;
    for(i=0;i<24;i++) {
        Wr8(REG_TOUCH_TRANSFORM_A + i,data[i]);

ft_uint32_t FT800::color_rgb(ft_uint8_t red,ft_uint8_t green, ft_uint8_t blue){
    return ((4UL<<24)|(((red)&255UL)<<16)|(((green)&255UL)<<8)|(((blue)&255UL)<<0));
ft_uint32_t FT800::clear_color_rgb(ft_uint8_t red,ft_uint8_t green, ft_uint8_t blue){
    return ((2UL<<24)|(((red)&255UL)<<16)|(((green)&255UL)<<8)|(((blue)&255UL)<<0));