File content as of revision 3:45ef2ebfeebc:

#include "mbed.h"           // tested with v112
#include "RA8875.h"         // tested with v102

LocalFileSystem local("local");
RA8875 lcd(p5, p6, p7, p12, NC, "tft");    // MOSI, MISO, SCK, /ChipSelect, /reset, name
Serial pc(USBTX, USBRX);

extern "C" void mbed_reset();


#define min(a,b) ((a<b)?a:b)
#define max(a,b) ((a>b)?a:b)

bool Intersect(rect_t rect, point_t p)
{
    if (p.x >= min(rect.p1.x, rect.p2.x) && p.x <= max(rect.p1.x, rect.p2.x)
    && p.y >= min(rect.p1.y, rect.p2.y) && p.y <= max(rect.p1.y, rect.p2.y))
        return true;
    else
        return false;
}

int GetScreenCapture(void)
{
    char fqfn[50];
    int i = 0;
    
    pc.printf("Screen Capture... ");
    for (i=1; i< 100; i++) {
        snprintf(fqfn, sizeof(fqfn), "/local/Screen%02d.bmp", i);
        FILE * fh = fopen(fqfn, "rb");
        if (!fh) {
            lcd.PrintScreen(0,0,480,272,fqfn);
            pc.printf(" as /local/Screen%02d.bmp\r\n", i);
            return i;
        } else {
            fclose(fh);     // close this and try the next
        }
    }
    return 0;
}

int main()
{
    pc.baud(460800);    // I like a snappy terminal, so crank it up!
    pc.printf("\r\nRA8875 Touch Colors - Build " __DATE__ " " __TIME__ "\r\n");
 
    pc.printf("Turning on display\r\n");
    lcd.init();
    lcd.TouchPanelCalibrate("Calibrate the touch panel");
    lcd.cls();
    
    // +----------------------------------------------------+
    // | (x,y) (xxx,yyy)      [Capture]      rgb (RR,GG,BB) |
    // | +------------------------------------------------+ | y =  50
    // | |                Sample Shown Here               | |
    // | +------------------------------------------------+ | y =  89
    // | Red 0 to 255 ------------------------------------+ | y = 100
    // | |                                                | |
    // | +------------------------------------------------+ | y = 139
    // | Grn 0 to 255 ------------------------------------+ | y = 150
    // | |                                                | |
    // | +------------------------------------------------+ | y = 189
    // | Blu 0 to 255 ------------------------------------+ | y = 200
    // | |                                                | |
    // | +------------------------------------------------+ | y = 239
    // +----------------------------------------------------+ y = 271
    //   10                                             470
    rect_t RGBList[] = {
        { 10,100, 470,139 },    // R
        { 10,150, 470,189 },    // G
        { 10,200, 470,239 },    // B
        { 10, 50, 470, 89 }     // This for the Sample
    };
    rect_t PrintScreenRect = { 235-30, 5, 235+30, 40};
    lcd.fillrect(RGBList[0], Red);
    lcd.fillrect(RGBList[1], Green);
    lcd.fillrect(RGBList[2], Blue);
    lcd.fillrect(PrintScreenRect, Gray);
    lcd.foreground(Blue);
    lcd.background(Gray);
    lcd.puts(235-28, 15, "Capture");
    lcd.background(Black);
    color_t rgb = Black;
    uint8_t rgbVal[3] = { 0, 0, 0 };
    
    for (;;) {
        point_t p;
        
        if (lcd.TouchPanelReadable(&p)) {
            lcd.foreground(Blue);
            lcd.SetTextCursor(10, 15);
            lcd.printf("(%3d,%3d)", p.x, p.y);
            
            if (Intersect(PrintScreenRect, p)) {
                GetScreenCapture();
            }
            for (int i=0; i<3; i++) {
                if (Intersect(RGBList[i], p)) {
                    uint8_t mag = (255 * (p.x - RGBList[i].p1.x)) / (RGBList[i].p2.x - RGBList[i].p1.x);
                    rgbVal[i] = mag;
                    lcd.SetTextCursor(380, 15);
                    lcd.foreground(Blue);
                    lcd.printf("(%02X,%02X,%02X)", rgbVal[0], rgbVal[1], rgbVal[2]);
                    rgb = RGB(rgbVal[0], rgbVal[1], rgbVal[2]);
                    lcd.fillrect(RGBList[3], rgb);
                    break;
                }
            }
        }
    }
}