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In our previously published article we talked about MCUFRIEND TFT Touch Screen. Arduino TFT Touch Screen Calculator is an Easy Example of Practical Deployment of Programmable Microcontroller From the Libraries. It is important to understand that this guide will only supply codes which may be buggy on different “models” of MCUFRIEND TFT Touch Screens. I named this article as “Part 1” for those bugs and no practical improvement of others codes. What code will work for me may not work for your same one (however you’ll not see a blank white screen) or you’ll see mirror image. Frankly, there is no question of circuit diagram for a shield with Arduino UNO. Simply snap on the shield on Arduino UNO.
Arduino TFT Touch Screen Calculator (MCUFRIEND)
Below code is for your understanding and matching with the examples from MCUFRIEND_KBV example libraries, it will only show the keys. This is how the keyboard is drawn, you can change the colors, tweak. void loop() is empty. The code actually not respond to touch, it is only for checking the keys :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | #define LCD_CS A3 // Chip Select goes to Analog 3 #define LCD_CD A2 // Command/Data goes to Analog 2 #define LCD_WR A1 // LCD Write goes to Analog 1 #define LCD_RD A0 // LCD Read goes to Analog 0 #define LCD_RESET A4 // Can alternately just connect to Arduino's reset pin #include <SPI.h> // f.k. for Arduino-1.5.2 #include "TouchScreen_kbv.h" #include "Adafruit_GFX.h"// Hardware-specific library #include <MCUFRIEND_kbv.h> MCUFRIEND_kbv tft; //#include <Adafruit_TFTLCD.h> //Adafruit_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET); // Assign human-readable names to some common 16-bit color values: #defineBLACK 0x0000 #defineBLUE 0x001F #defineRED 0xF800 #defineGREEN 0x07E0 #define CYAN 0x07FF #define MAGENTA 0xF81F #define YELLOW 0xFFE0 #define WHITE 0xFFFF #ifndef min #define min(a, b) (((a) < (b)) ? (a) : (b)) #endif String Key[4][4] = { { "7", "8", "9", "/" }, { "4", "5", "6", "*" }, { "1", "2", "3", "-" }, { "C", "0", "=", "+" } }; String N1, N2, ShowSC, opt; bool updata=false; float answers=-1; void setup() { Serial.begin(9600); tft.reset(); tft.begin(0x9341); // SDFP5408 tft.setRotation(0); tft.fillScreen(BLACK); tft.fillRect(0, 80, 240, 240, WHITE); tft.drawFastHLine(0, 80, 240, BLACK); tft.drawFastHLine(0, 140, 240, BLACK); tft.drawFastHLine(0, 200, 240, BLACK); tft.drawFastHLine(0, 260, 240, BLACK); tft.drawFastHLine(0, 320-1, 240, BLACK); tft.drawFastVLine(0, 80, 240, BLACK); tft.drawFastVLine(60, 80, 240, BLACK); tft.drawFastVLine(120, 80, 240, BLACK); tft.drawFastVLine(180, 80, 240, BLACK); tft.drawFastVLine(240-1, 80, 240, BLACK); for (int y=0;y<4;y++) { for (int x=0;x<4;x++) { tft.setCursor(22 + (60*x), 100 + (60*y)); tft.setTextSize(3); tft.setTextColor(BLACK); tft.println(Key[y][x]); } } } void loop() { } |
If with the above code you see everything fine but digits mirrored, then possibly you have some slightly different hardware, you probably need to tweak the like tft.setRotation. You can perform Google search to fix it. It is not big matter.
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What others did so far, they used this library :
1 | https://github.com/JoaoLopesF/SPFD5408 |
And used the below code from maxpromer (on GitHub) :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 | #include <SPFD5408_Adafruit_GFX.h> // Core graphics library #include <SPFD5408_Adafruit_TFTLCD.h> // Hardware-specific library #include <SPFD5408_TouchScreen.h> #define YP A1 // must be an analog pin, use "An" notation! #define XM A2 // must be an analog pin, use "An" notation! #define YM 7 // can be a digital pin #define XP 6 // can be a digital pin // Calibrate values #define TS_MINX 125 #define TS_MINY 85 #define TS_MAXX 965 #define TS_MAXY 905 TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300); #define LCD_CS A3 #define LCD_CD A2 #define LCD_WR A1 #define LCD_RD A0 // optional #define LCD_RESET A4 // Assign human-readable names to some common 16-bit color values: #define BLACK 0x0000 #define BLUE 0x001F #define RED 0xF800 #define GREEN 0x07E0 #define CYAN 0x07FF #define MAGENTA 0xF81F #define YELLOW 0xFFE0 #define WHITE 0xFFFF #define MINPRESSURE 10 #define MAXPRESSURE 1000 Adafruit_TFTLCD tft(LCD_CS, LCD_CD, LCD_WR, LCD_RD, LCD_RESET); String Key[4][4] = { { "7", "8", "9", "/" }, { "4", "5", "6", "*" }, { "1", "2", "3", "-" }, { "C", "0", "=", "+" } }; String N1, N2, ShowSC, opt; bool updata=false; float answers=-1; void setup() { Serial.begin(9600); tft.reset(); tft.begin(0x9341); // SDFP5408 tft.setRotation(2); tft.fillScreen(BLACK); tft.fillRect(0, 80, 240, 240, WHITE); tft.drawFastHLine(0, 80, 240, BLACK); tft.drawFastHLine(0, 140, 240, BLACK); tft.drawFastHLine(0, 200, 240, BLACK); tft.drawFastHLine(0, 260, 240, BLACK); tft.drawFastHLine(0, 320-1, 240, BLACK); tft.drawFastVLine(0, 80, 240, BLACK); tft.drawFastVLine(60, 80, 240, BLACK); tft.drawFastVLine(120, 80, 240, BLACK); tft.drawFastVLine(180, 80, 240, BLACK); tft.drawFastVLine(240-1, 80, 240, BLACK); for (int y=0;y<4;y++) { for (int x=0;x<4;x++) { tft.setCursor(22 + (60*x), 100 + (60*y)); tft.setTextSize(3); tft.setTextColor(BLACK); tft.println(Key[y][x]); } } } void loop() { TSPoint p = waitTouch(); Serial.println(p.x); updata = false; for (int i1=0;i1<4;i1++) { for (int i2=0;i2<4;i2++) { if ((p.x>=240-((i1+1)*60)+1&&p.x<=240-(i1*60)-1)&&(p.y>=(i2*60)+1&&p.y<=((i2+1)*60)-1)) { if ((i1<=2&&i2<=2)||(i1==3&&i2==1)) { if (opt==0) { if (answers!=-1) answers = -1; N1 = N1 + Key[i1][i2]; ShowSC = N1; } else { N2 = N2 + Key[i1][i2]; ShowSC = opt + N2; } } else { if (Key[i1][i2]=="C") { N1 = N2 = ""; opt = ""; answers = 0; ShowSC = N1; } else if (i2==3) { if (N1=="") N1 = String(answers); opt = Key[i1][i2]; ShowSC = Key[i1][i2]; } else if (Key[i1][i2]=="=") { if (opt=="+") answers = N1.toInt() + N2.toInt(); else if (opt=="-") answers = N1.toInt() - N2.toInt(); else if (opt=="*") answers = N1.toInt() * N2.toInt(); else if (opt=="/") answers = N1.toInt() / N2.toInt(); N1 = N2 = opt = ""; ShowSC = answers; } } updata = true; } } } if (updata) { tft.fillRect(0, 0, 240, 80, BLACK); tft.setCursor(10, 10); tft.setTextSize(3); tft.setTextColor(WHITE); tft.println(ShowSC); } delay(300); } TSPoint waitTouch() { TSPoint p; do { p = ts.getPoint(); pinMode(XM, OUTPUT); pinMode(YP, OUTPUT); } while((p.z < MINPRESSURE )|| (p.z > MAXPRESSURE)); p.x = map(p.x, TS_MINX, TS_MAXX, 0, 320); p.y = map(p.y, TS_MINY, TS_MAXY, 0, 240);; return p; } |
It is kind of beta version of progress and a self-reminder. You can proceed to read Part 2 of this effort.
Tagged With MCUfriend , \\63 131 137 247\Deployment\TOUCH\SCIX\setup exe , mcufriend com , arduino taschenrechner tft display , mcufriend button , mcufriend library#define PIN_OUTPUT(p b) , arduino UNO CLOCK CODE WITH MCU KBV DISPLAY , mcufriend tft library , arduino tft lcd , file://209 235 232 105/Deployment/TOUCH/SCIX