File content as of revision 4:acb0aea7d4fe:

/*
* Author: Nikolai Zimfer, 2020
* MIT License: http://mbed.org/license/mit
*
* HARDWARE:
* Board FRDM-K64F                        - https://os.mbed.com/platforms/FRDM-K64F/
* Display 4.3" 480 x 272 (RVT43ULFNWC03) - https://riverdi.com/product/rvt43ulfnwc0x/
* Break Out Board 20                     - https://riverdi.com/product/break-out-board-20/
* Cable FFC, 0.5mm pitch, 20 pin, 150 mm - https://riverdi.com/product/ffc0520150/
*
* CONNECTION:
* -----------------------------------
* FRDM-K64F           Break Out Board
* -----------------------------------
* +3.3V           --- Pin 17 BLVDD   
* +3.3V           --- Pin 1 VDD      
* GND             --- Pin 2 GND      
* D13 (PTD1) SCLK --- Pin 3 SPI SCLK 
* D12 (PTD3) MISO --- Pin 4 MISO     
* D11 (PTD2) MOSI --- PIN 5 MOSI     
* D10 (PTD0)      --- Pin 6 CS       
* D9  (PTC4)      --- Pin 7 INT      
* D8  (PTC12)     --- Pin 8 PD       
* -----------------------------------
*
* CODE main.cpp
* FT800 TFT(D11, D12, D13, D10, D9, D8);   // FRDM-K64F, SPI Initialization
*
* IMAGE:
* https://os.mbed.com/media/uploads/nz/demo-sliders.jpg
*/

#include "mbed.h"
#include "FT800.h"

/*
FT800 TFT(MOSI,MISO,SCLK, CS, INT, PD);   */
FT800 TFT( D11, D12, D13, D10, D9, D8);   // FRDM-K64F, SPI Initialization

uint32_t color;
uint8_t r = 64, g = 128, b = 192;
uint8_t w = 200, h = 200, x = 50, y = 50;
uint8_t width, height, posx, posy, tag = 0;

void screen()
{
    TFT.finishList();
    TFT.DLstart(GRAY,100);  // start Display Liste, Backgroundcolor = GRAY,
    TFT.tagMask(0);         //     Backlight brightness = 100 (100/128≈78%)
    
    color = (r<<16)|(g<<8)|b;
    width  = w/2;
    height = h/2;
    posx = x/2;
    posy = y/2;
    
    TFT.drawRect(posx, posy, posx + width, posy + height, color, 1);
    
    TFT.drawText(150,  2, 29, RED,  OPT_FLAT, "R");
    TFT.drawText(150, 42, 29, GREEN,OPT_FLAT, "G");
    TFT.drawText(150, 82, 29, BLUE, OPT_FLAT, "B");
    TFT.drawText(150,122, 29, BLACK,OPT_FLAT, "W");
    TFT.drawText(150,162, 29, BLACK,OPT_FLAT, "H");
    TFT.drawText(150,202, 29, BLACK,OPT_FLAT, "X");
    TFT.drawText(150,242, 29, BLACK,OPT_FLAT, "Y");
    
    TFT.drawNumber(475,  4, 28, RED, OPT_RIGHTX, r);
    TFT.drawNumber(475, 44, 28,GREEN,OPT_RIGHTX, g);
    TFT.drawNumber(475, 84, 28,BLUE, OPT_RIGHTX, b);
    TFT.drawNumber(475,124, 28,BLACK,OPT_RIGHTX, width);
    TFT.drawNumber(475,164, 28,BLACK,OPT_RIGHTX, height);
    TFT.drawNumber(475,204, 28,BLACK,OPT_RIGHTX, posx);
    TFT.drawNumber(475,244, 28,BLACK,OPT_RIGHTX, posy);
    
    TFT.drawSlider(185, 10, 245,12, OPT_3D, RED,    RED,    RED,     r, 255, 1);
    TFT.drawSlider(185, 50, 245,12, OPT_3D, GREEN,  GREEN,  GREEN,   g, 255, 2);
    TFT.drawSlider(185, 90, 245,12, OPT_3D, BLUE,   BLUE,   BLUE,    b, 255, 3);
    TFT.drawSlider(185,130, 245,12, OPT_3D, DIMGRAY,DIMGRAY,DIMGRAY, w, 255, 4);
    TFT.drawSlider(185,170, 245,12, OPT_3D, DIMGRAY,DIMGRAY,DIMGRAY, h, 255, 5);
    TFT.drawSlider(185,210, 245,12, OPT_3D, DIMGRAY,DIMGRAY,DIMGRAY, x, 255, 6);
    TFT.drawSlider(185,250, 245,12, OPT_3D, DIMGRAY,DIMGRAY,DIMGRAY, y, 255, 7);
    
    TFT.DLend();    
}

int main()
{   
    TFT.Init();
        
    TFT.DLstart(GRAY); // start Display Liste (Backgroundcolor = GRAY, Backlight brightness = 100%)
    TFT.runTouchCalibration();
    TFT.DLend(); 
    
    while(1)
    {
        screen();

        TFT.clearIntFlags();
        tag = TFT.readTag();
        
        if(tag != 0)
        {
            if (tag == 1)   r = TFT.readValue()>>8;
            if (tag == 2)   g = TFT.readValue()>>8;
            if (tag == 3)   b = TFT.readValue()>>8;
            if (tag == 4)   w = TFT.readValue()>>8;
            if (tag == 5)   h = TFT.readValue()>>8;
            if (tag == 6)   x = TFT.readValue()>>8;
            if (tag == 7)   y = TFT.readValue()>>8;
        }
    }
}