/********************************************************************* * * LCD_ID_Reader * * This sketch is meant only to attempt to read the driver ID code * from inexpensive touchscreen LCDs found on eBay without needing to * load any additional libraries. The hope is to identify the most * common varieties and choose the best library for the screen you have. * * This has been successfully tested so far on 992X and 778X variety * screens. * * Usage: * * Compile the sketch and run it on your board with the screen * attached. In the serial monitor, you should see a message containing * the driver code. The tricky thing is that if it does not work, the * results may be undetermined. However, if we can compile a list, * the difference between working and not may become more evident. * * Please visit http://misc.ws/lcd_information for more information. * * Version 1.2 - January 29th, 2015 * *********************************************************************/ /********************************************************************* * * PIN ASSIGNMENTS * * You can alter the pin assignments to reflect any configuration you * wish. I've provided the default shield configuration, which works * on both the Arduino UNO and Mega 2560. * *********************************************************************/ //-- Arduino UNO or Mega 2560 Plugged as shield #define LCD_RST A4 #define LCD_CS A3 #define LCD_RS A2 #define LCD_WR A1 #define LCD_RD A0 #define LCD_D0 8 #define LCD_D1 9 #define LCD_D2 2 #define LCD_D3 3 #define LCD_D4 4 #define LCD_D5 5 #define LCD_D6 6 #define LCD_D7 7 /********************************************************************* * * Attempt to initialize and reset LCD, then read its Driver Code * at register index 0. * *********************************************************************/ void setup() { char hexString[7]; uint16_t id; Serial.begin(9600); Serial.println("Initializing LCD..."); lcdInit(); lcdReset(); delay(500); Serial.print("Reading ID..."); id = lcdReadID(); sprintf(hexString, "0x%0.4X", id); Serial.println( hexString ); if( id == 0x7783 ) { lcdRegister7783(); lcdFillScreen(0xF800); Serial.println("If your screen filled red, then you may be able to use the library at https://github.com/Smoke-And-Wires/TFT-Shield-Example-Code"); } else if( id == 0x0154 ) { lcdRegister0154(); lcdFillScreen(0xF800); Serial.println("If your screen filled red, please report it at http://misc.ws/lcd_information"); Serial.println("There is currently no known working library."); //}//else if( id == 0x0000 ) { // lcdRegister0000(); // lcdFillScreen(0xF800); // Serial.println("If your screen filled red, then you may be able to use the library Adafruit_ILI9341_8bit_AS.h"); // Serial.println("This works for the Samsung Driver Chip Type "); //} }else { lcdRegisterOther(); lcdFillScreen(0xF800); Serial.println("If your screen filled red, you may be able to use the library at http://misc.ws"); } //print_all_regs(); } void print_all_regs() { char str[60]; uint16_t i, val; for(i=0; i < 256; i++ ) { delay(40); val = lcdReadRegister(i); sprintf(str, "Register 0x%0.2X : 0x%0.4X", i, val); Serial.println( str ); } } void loop() { } /********************************************************************* * * LCD Functions - Inefficient but should be good enough * to read the ID. * *********************************************************************/ void lcdRegister0154() { lcdWriteRegister(0x000C, 0x130); lcdWriteRegister(0x0080, 0x8d); lcdWriteRegister(0x0092, 0x10); lcdWriteRegister(0x0011, 0x1b); lcdWriteRegister(0x0012, 0x3101); lcdWriteRegister(0x0013, 0x105f); lcdWriteRegister(0x0014, 0x667f); lcdWriteRegister(0x0010, 0x800); delay(20); lcdWriteRegister(0x0011, 0x11b); delay(20); lcdWriteRegister(0x0011, 0x31b); delay(20); lcdWriteRegister(0x0011, 0x71b); delay(20); lcdWriteRegister(0x0011, 0xf1b); delay(20); lcdWriteRegister(0x0011, 0xf3b); delay(30); lcdWriteRegister(0x0001, 0x2128); lcdWriteRegister(0x0002, 0x100); lcdWriteRegister(0x0003, 0x1030); lcdWriteRegister(0x0007, 0); lcdWriteRegister(0x0008, 0x808); lcdWriteRegister(0x000B, 0x1100); lcdWriteRegister(0x000F, 0xf01); lcdWriteRegister(0x0015, 0); lcdWriteRegister(0x0030, 0); lcdWriteRegister(0x0034, 319); lcdWriteRegister(0x0035, 0); lcdWriteRegister(0x0036, 239); lcdWriteRegister(0x0037, 0); lcdWriteRegister(0x0038, 319); lcdWriteRegister(0x0039, 0); lcdWriteRegister(0x0050, 0); lcdWriteRegister(0x0051, 0xf00); lcdWriteRegister(0x0052, 0xa03); lcdWriteRegister(0x0053, 0x300); lcdWriteRegister(0x0054, 0xc05); lcdWriteRegister(0x0055, 0xf00); lcdWriteRegister(0x0056, 0xf00); lcdWriteRegister(0x0057, 3); lcdWriteRegister(0x0058, 0x1f07); lcdWriteRegister(0x0059, 0x71f); delay(20); lcdWriteRegister(0x0007, 0x12); delay(20); lcdWriteRegister(0x0007, 0x13); } void lcdRegisterOther() { Serial.println("Loading LCD registers..."); lcdWriteRegister(0x00e5,0x8000); lcdWriteRegister(0x0000,0x0001); lcdWriteRegister(0x0001,0x0100); lcdWriteRegister(0x0002,0x0700); lcdWriteRegister(0x0003,0x1030); lcdWriteRegister(0x0004,0x0000); lcdWriteRegister(0x0008,0x0202); lcdWriteRegister(0x0009,0x0000); lcdWriteRegister(0x000a,0x0000); lcdWriteRegister(0x000c,0x0000); lcdWriteRegister(0x000d,0x0000); lcdWriteRegister(0x000f,0x0000); lcdWriteRegister(0x0010,0x0000); lcdWriteRegister(0x0011,0x0000); lcdWriteRegister(0x0012,0x0000); lcdWriteRegister(0x0013,0x0000); lcdWriteRegister(0x0010,0x17b0); lcdWriteRegister(0x0011,0x0037); lcdWriteRegister(0x0012,0x0138); lcdWriteRegister(0x0013,0x1700); lcdWriteRegister(0x0029,0x000d); lcdWriteRegister(0x0020,0x0000); lcdWriteRegister(0x0021,0x0000); lcdWriteRegister(0x0030,0x0001); lcdWriteRegister(0x0031,0x0606); lcdWriteRegister(0x0032,0x0304); lcdWriteRegister(0x0033,0x0202); lcdWriteRegister(0x0034,0x0202); lcdWriteRegister(0x0035,0x0103); lcdWriteRegister(0x0036,0x011d); lcdWriteRegister(0x0037,0x0404); lcdWriteRegister(0x0038,0x0404); lcdWriteRegister(0x0039,0x0404); lcdWriteRegister(0x003c,0x0700); lcdWriteRegister(0x003d,0x0a1f); lcdWriteRegister(0x0050,0x0000); lcdWriteRegister(0x0051,0x00ef); lcdWriteRegister(0x0052,0x0000); lcdWriteRegister(0x0053,0x013f); lcdWriteRegister(0x0060,0x2700); lcdWriteRegister(0x0061,0x0001); lcdWriteRegister(0x006a,0x0000); lcdWriteRegister(0x0090,0x0010); lcdWriteRegister(0x0092,0x0000); lcdWriteRegister(0x0093,0x0003); lcdWriteRegister(0x0095,0x0101); lcdWriteRegister(0x0097,0x0000); lcdWriteRegister(0x0098,0x0000); lcdWriteRegister(0x0007,0x0021); lcdWriteRegister(0x0007,0x0031); lcdWriteRegister(0x0007,0x0173); } void lcdRegister7783() { lcdWriteRegister(0x0001,0x0100); lcdWriteRegister(0x0002,0x0700); lcdWriteRegister(0x0003,0x1030); lcdWriteRegister(0x0008,0x0302); lcdWriteRegister(0x0009,0x0000); lcdWriteRegister(0x000A,0x0008); lcdWriteRegister(0x0010,0x0790); lcdWriteRegister(0x0011,0x0005); lcdWriteRegister(0x0012,0x0000); lcdWriteRegister(0x0013,0x0000); lcdWriteRegister(0x0010,0x12B0); lcdWriteRegister(0x0011,0x0007); lcdWriteRegister(0x0012,0x008C); lcdWriteRegister(0x0013,0x1700); lcdWriteRegister(0x0029,0x0022); lcdWriteRegister(0x0030,0x0000); lcdWriteRegister(0x0031,0x0505); lcdWriteRegister(0x0032,0x0205); lcdWriteRegister(0x0035,0x0206); lcdWriteRegister(0x0036,0x0408); lcdWriteRegister(0x0037,0x0000); lcdWriteRegister(0x0038,0x0504); lcdWriteRegister(0x0039,0x0206); lcdWriteRegister(0x003C,0x0206); lcdWriteRegister(0x003D,0x0408); lcdWriteRegister(0x0050,0x0000); lcdWriteRegister(0x0051,0x00EF); lcdWriteRegister(0x0052,0x0000); lcdWriteRegister(0x0053,0x013F); lcdWriteRegister(0x0060,0xA700); lcdWriteRegister(0x0061,0x0001); lcdWriteRegister(0x0090,0x0033); lcdWriteRegister(0x0007,0x0133); lcdWriteRegister(0x0001,0x0100); lcdWriteRegister(0x0002,0x0700); lcdWriteRegister(0x0003,0x1030); lcdWriteRegister(0x0008,0x0302); lcdWriteRegister(0x0009,0x0000); lcdWriteRegister(0x000A,0x0008); lcdWriteRegister(0x0010,0x0790); lcdWriteRegister(0x0011,0x0005); lcdWriteRegister(0x0012,0x0000); lcdWriteRegister(0x0013,0x0000); lcdWriteRegister(0x0010,0x12B0); lcdWriteRegister(0x0011,0x0007); lcdWriteRegister(0x0012,0x008C); lcdWriteRegister(0x0013,0x1700); lcdWriteRegister(0x0029,0x0022); lcdWriteRegister(0x0030,0x0000); lcdWriteRegister(0x0031,0x0505); lcdWriteRegister(0x0032,0x0205); lcdWriteRegister(0x0035,0x0206); lcdWriteRegister(0x0036,0x0408); lcdWriteRegister(0x0037,0x0000); lcdWriteRegister(0x0038,0x0504); lcdWriteRegister(0x0039,0x0206); lcdWriteRegister(0x003C,0x0206); lcdWriteRegister(0x003D,0x0408); lcdWriteRegister(0x0050,0x0000); lcdWriteRegister(0x0051,0x00EF); lcdWriteRegister(0x0052,0x0000); lcdWriteRegister(0x0053,0x013F); lcdWriteRegister(0x0060,0xA700); lcdWriteRegister(0x0061,0x0001); lcdWriteRegister(0x0090,0x0033); lcdWriteRegister(0x0007,0x0133); } void lcdInit() { pinMode(LCD_CS, OUTPUT); digitalWrite(LCD_CS, HIGH); pinMode(LCD_RS, OUTPUT); digitalWrite(LCD_RS, HIGH); pinMode(LCD_WR, OUTPUT); digitalWrite(LCD_WR, HIGH); pinMode(LCD_RD, OUTPUT); digitalWrite(LCD_RD, HIGH); pinMode(LCD_RST, OUTPUT); digitalWrite(LCD_RST, HIGH); } void lcdReset() { digitalWrite(LCD_RST, LOW); delay(2); digitalWrite(LCD_RST, HIGH); lcdWriteData(0); lcdWriteData(0); lcdWriteData(0); lcdWriteData(0); } void lcdWrite8(uint16_t data) { digitalWrite(LCD_D0, data & 1); digitalWrite(LCD_D1, (data & 2) >> 1); digitalWrite(LCD_D2, (data & 4) >> 2); digitalWrite(LCD_D3, (data & 8) >> 3); digitalWrite(LCD_D4, (data & 16) >> 4); digitalWrite(LCD_D5, (data & 32) >> 5); digitalWrite(LCD_D6, (data & 64) >> 6); digitalWrite(LCD_D7, (data & 128) >> 7); } uint16_t lcdRead8() { uint16_t result = digitalRead(LCD_D7); result <<= 1; result |= digitalRead(LCD_D6); result <<= 1; result |= digitalRead(LCD_D5); result <<= 1; result |= digitalRead(LCD_D4); result <<= 1; result |= digitalRead(LCD_D3); result <<= 1; result |= digitalRead(LCD_D2); result <<= 1; result |= digitalRead(LCD_D1); result <<= 1; result |= digitalRead(LCD_D0); return result; } void lcdSetWriteDir() { pinMode(LCD_D0, OUTPUT); pinMode(LCD_D1, OUTPUT); pinMode(LCD_D2, OUTPUT); pinMode(LCD_D3, OUTPUT); pinMode(LCD_D4, OUTPUT); pinMode(LCD_D5, OUTPUT); pinMode(LCD_D6, OUTPUT); pinMode(LCD_D7, OUTPUT); } void lcdSetReadDir() { pinMode(LCD_D0, INPUT); pinMode(LCD_D1, INPUT); pinMode(LCD_D2, INPUT); pinMode(LCD_D3, INPUT); pinMode(LCD_D4, INPUT); pinMode(LCD_D5, INPUT); pinMode(LCD_D6, INPUT); pinMode(LCD_D7, INPUT); } void lcdWriteData(uint16_t data) { lcdSetWriteDir(); digitalWrite(LCD_CS, LOW); digitalWrite(LCD_RS, HIGH); digitalWrite(LCD_RD, HIGH); digitalWrite(LCD_WR, HIGH); lcdWrite8(data >> 8); digitalWrite(LCD_WR, LOW); delayMicroseconds(10); digitalWrite(LCD_WR, HIGH); lcdWrite8(data); digitalWrite(LCD_WR, LOW); delayMicroseconds(10); digitalWrite(LCD_WR, HIGH); digitalWrite(LCD_CS, HIGH); } void lcdWriteCommand(uint16_t command) { lcdSetWriteDir(); digitalWrite(LCD_CS, LOW); digitalWrite(LCD_RS, LOW); digitalWrite(LCD_RD, HIGH); digitalWrite(LCD_WR, HIGH); lcdWrite8(command >> 8); digitalWrite(LCD_WR, LOW); delayMicroseconds(10); digitalWrite(LCD_WR, HIGH); lcdWrite8(command); digitalWrite(LCD_WR, LOW); delayMicroseconds(10); digitalWrite(LCD_WR, HIGH); digitalWrite(LCD_CS, HIGH); } int lcdReadData() { uint16_t result; lcdSetReadDir(); digitalWrite(LCD_CS, LOW); digitalWrite(LCD_RS, HIGH); digitalWrite(LCD_RD, HIGH); digitalWrite(LCD_WR, HIGH); digitalWrite(LCD_RD, LOW); delayMicroseconds(10); result = lcdRead8() << 8; digitalWrite(LCD_RD, HIGH); delayMicroseconds(10); digitalWrite(LCD_RD, LOW); delayMicroseconds(10); result |= lcdRead8(); digitalWrite(LCD_RD, HIGH); digitalWrite(LCD_CS, HIGH); return result; } void lcdWriteRegister(uint16_t addr, uint16_t data) { lcdWriteCommand(addr); lcdWriteData(data); } uint16_t lcdReadRegister(uint16_t reg) { lcdWriteCommand(reg); return lcdReadData(); } uint16_t lcdReadID() { return lcdReadRegister(0x00); } void lcdFillScreen(uint16_t color) { Serial.println("Filling the screen..."); /*lcdWriteRegister(0x0050, 0); lcdWriteRegister(0x0051, 219); lcdWriteRegister(0x0052, 0); lcdWriteRegister(0x0053, 319); */ lcdWriteRegister(0x0020, 0); lcdWriteRegister(0x0021, 0); lcdWriteCommand(0x0022); digitalWrite(LCD_CS, LOW); digitalWrite(LCD_RS, HIGH); digitalWrite(LCD_RD, HIGH); digitalWrite(LCD_WR, HIGH); lcdSetWriteDir(); uint32_t i = 320; i *=240; while( i-- ) { lcdWrite8(color >> 8); digitalWrite(LCD_WR, LOW); delayMicroseconds(10); digitalWrite(LCD_WR, HIGH); lcdWrite8(color); digitalWrite(LCD_WR, LOW); delayMicroseconds(10); digitalWrite(LCD_WR, HIGH); } digitalWrite(LCD_CS, HIGH); Serial.println("Done filling..."); }