main.cpp

00001 /*******************************************************************
00002  * TFT Sample program for STEM project
00003  * By Henry Foley, Feb 2017
00004  *
00005  * Hardware: Freedom KL25Z uC development board with a TFT 2.8"
00006  * resistive touch display shield from Adafruit (1651).
00007  *
00008  */
00009 
00010 #include "mbed.h"
00011 #include "ILI9341.h"
00012 #include "SPI_STMPE610.h"
00013 #include "Arial12x12.h"
00014 #include "Arial24x23.h"
00015 #include "Arial28x28.h"
00016 #include "Verdana22x21-16.h"
00017 
00018 #define PIN_XP          PTB3
00019 #define PIN_XM          PTB1
00020 #define PIN_YP          PTB2
00021 #define PIN_YM          PTB0
00022 #define PIN_MOSI        PTD2
00023 #define PIN_MISO        PTD3
00024 #define PIN_SCLK        PTD1
00025 #define PIN_CS_TFT      PTD0
00026 #define PIN_DC_TFT      PTD5
00027 #define PIN_BL_TFT      PTC9
00028 #define PIN_CS_SD       PTA4
00029 #define PIN_CS_TSC      PTA13
00030 #define PIN_RESET_TFT   PTB10  
00031 
00032 
00033 
00034 DigitalOut backlight(PTA12) ;
00035 
00036 SPI_STMPE610 TSC(PIN_MOSI, PIN_MISO, PIN_SCLK, PIN_CS_TSC) ;
00037 
00038 ILI9341 TFT(SPI_8, 10000000,
00039             PIN_MOSI, PIN_MISO,  PIN_SCLK,
00040             PIN_CS_TFT, PIN_RESET_TFT, PIN_DC_TFT, "Adafruit2.8") ;
00041             
00042 void initTFT(void);
00043 void drawScreen(void);
00044 uint16_t map(uint16_t, uint16_t, uint16_t, uint16_t, uint16_t);
00045 void display_xy(void);
00046 
00047 int main()
00048 {
00049     static uint16_t x, y, z ;
00050     uint16_t temp_x;
00051     int touched = 0;
00052 
00053     initTFT() ;
00054 
00055     drawScreen();
00056      
00057     while(true)
00058     {
00059         touched = TSC.getRAWPoint(&x, &y, &z);
00060         
00061         if(touched)  // any touch
00062         {
00063                 
00064             // scale the raw values to match the screen orentation and 320(x = horiz) 240(y = vert) size, 0,0 = upper left corner
00065             temp_x = x;
00066             x = map(y,180, 3800,0,320);
00067             y = map(temp_x,3800,280,0,240);
00068             if( (x > 0 && x < 320) && ( y > 0 && y < 240 ))  // if valid values
00069             {
00070                 drawScreen();
00071                 
00072                 TFT.BusEnable(true) ;
00073                 TFT.background(Blue);
00074                 wait(0.2);
00075                 TFT.foreground(White);
00076                 TFT.locate(120, 160);
00077                 TFT.printf("x%3d", x);
00078                 TFT.locate(120, 190);
00079                 TFT.printf("y%3d", y);                
00080                 TFT.BusEnable(false) ;
00081                 wait(0.5); // to reduce mutiple hits from one touch
00082             }
00083         
00084         } 
00085     }
00086 } // end of main()
00087 
00088 void initTFT(void)
00089 {
00090     //Configure the display driver
00091     TFT.BusEnable(true) ;
00092     TFT.set_orientation(1);
00093     backlight = 1 ;
00094     TFT.background(Blue);
00095     wait(0.2);
00096     TFT.foreground(White);
00097     wait(0.2);
00098     TFT.cls();
00099     wait(0.2);
00100     TFT.set_font((unsigned char*) Arial28x28);
00101     wait(0.2);
00102     TFT.locate(15, 10);
00103     TFT.printf("  TFT Test  ");
00104     TFT.locate(15, 100);
00105     TFT.BusEnable(false);
00106     wait(5);
00107 }
00108 
00109 
00110 void drawScreen(void)
00111 {
00112     TFT.BusEnable(true);
00113     TFT.foreground(White);  // Set default text colors
00114     TFT.background(Blue);
00115     TFT.cls();              // wipe the screen clean and set bg colors
00116     wait(0.1);
00117 
00118     TFT.foreground(Black);
00119     TFT.set_font((unsigned char*) Arial24x23);
00120     TFT.fillcircle(  60, 175, 50, Yellow);
00121     TFT.background(Yellow) ;
00122     TFT.locate(25, 160);
00123     TFT.printf(" A ");
00124 
00125     TFT.fillcircle( 160, 105, 50, Cyan);
00126     TFT.background(Cyan) ;
00127     TFT.locate(127, 92);
00128     TFT.printf(" B ");
00129 
00130     TFT.fillcircle( 260, 175, 50, Green);
00131     TFT.background(Green) ;
00132     TFT.locate(222, 160);
00133     TFT.printf("  C  ");
00134     
00135     TFT.fillcircle( 60, 60, 50, Orange);
00136     TFT.background(Orange) ;
00137     TFT.locate(15, 50);
00138     TFT.printf("  D  ");
00139     
00140     TFT.fillcircle( 260, 60, 50, GreenYellow);
00141     TFT.background(GreenYellow) ;
00142     TFT.locate(225, 50);
00143     TFT.printf("  E  ");   
00144 
00145     TFT.BusEnable(false) ;
00146 }
00147 
00148 // mapping function to change the orentation of the screen to horizontal
00149 uint16_t map(uint16_t x, uint16_t in_min, uint16_t in_max, uint16_t out_min, uint16_t out_max)
00150 {
00151     return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
00152 }
00153 
00154 // Code used to debug screen orentation and touch pad
00155 void display_xy(void)
00156 {
00157     static uint16_t x, y, z ;
00158     uint16_t temp_x;
00159     int touched = 0;
00160 
00161     while(true) {
00162         touched = TSC.getRAWPoint(&x, &y, &z);
00163 
00164         x = x & 0x7f;
00165         y = y & 0x7f;
00166         
00167         if(x) { // any touch
00168             wait(0.5);
00169             TFT.BusEnable(true);
00170             TFT.locate(5, 40);
00171             TFT.printf("x= %5d x=%4X", x, x);
00172             TFT.locate(5, 80);
00173             TFT.printf("y= %5d y=%4X", y, y);
00174  //           TFT.locate(5, 120);
00175  //           TFT.printf("raw z%6d  z%4X", z, z);           
00176 
00177             // scale the raw values to match the screen orentation and 320(x = horiz) 240(y = vert) size
00178             // 0,0 = upper left corner
00179             temp_x = x;
00180             x = map(y,180, 3800,0,320);              // TFT.set_orientation(1);
00181             y = map(temp_x,3800,280,0,240);
00182 
00183 //          x = map(y,3800, 180,0,320);              // TFT.set_orientation(3);
00184 //          y = map(temp_x,280,3800,0,240);
00185 
00186             TFT.locate(5, 120);
00187             TFT.printf("map x%5d y%5d", x, y);
00188  
00189             TFT.BusEnable(false);
00190             wait(0.5);
00191         }
00192     }
00193 }
00194