Bodmer
40d35b1892
Reference to particular drivers in examples have been removed as multiple display drivers are now supported. Tabs replaced by spaces in header file by file editor. RPi TFT with write strobe SPI clock rate dropped to 20MHz (display cannot cope with new high rate siWriteBlock() function)
167 lines
4.1 KiB
Arduino
167 lines
4.1 KiB
Arduino
// Read the ID from the TFT controller
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// The sketch only supports displays with a bi-directional SPI data line (often labelled SDA)
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// Bit bashes SPI so it does NOT assume hardware SPI wired up
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// No other libraries are needed
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// Original author unknown
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// Adapted by Bodmer 22/5/16, updated 16/9/16
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// Change the pin settings to suit your hardware
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// UNO etc
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//#define TFT_MOSI 11
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//#define TFT_SCK 13
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//#define TFT_CS 9
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//#define TFT_DC 8
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//#define TFT_RESET 7
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//Mega
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//#define TFT_MOSI 51
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//#define TFT_SCK 52
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//#define TFT_CS 47
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//#define TFT_DC 48
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//#define TFT_RESET 44
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//Micro
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//#define TFT_MOSI MOSI
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//#define TFT_SCK SCK
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//#define TFT_CS 10
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//#define TFT_DC 9
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//#define TFT_RESET 8
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//NodeMCU
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#define TFT_MOSI D7
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#define TFT_SCK D5
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#define TFT_CS D8
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#define TFT_DC D3
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#define TFT_RESET D4
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/* Example Serial Monitor output:
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TFT driver register values:
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===========================
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Register 0x01: 0x00
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Register 0x04: 0x548066
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Register 0x09: 0x610000
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Register 0x0A: 0x08
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Register 0x0B: 0x00
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Register 0x0C: 0x06
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Register 0x0D: 0x00
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Register 0x0E: 0x00
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Register 0x0F: 0x00
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Register 0x2E: 0x1834B4
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Register 0xDA: 0x54
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Register 0xDB: 0x80
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Register 0xDC: 0x66
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===========================
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Looks like driver chip is: ILI9163 (based on datasheet ID)
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*/
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char *chip = "Unknown ";
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uint32_t readwrite8(uint8_t cmd, uint8_t bits, uint8_t dummy)
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{
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uint32_t ret = 0;
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uint8_t val = cmd;
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int cnt = 8;
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digitalWrite(TFT_CS, LOW);
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digitalWrite(TFT_DC, LOW);
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pinMode(TFT_MOSI, OUTPUT);
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for (int i = 0; i < 8; i++) { //send command
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digitalWrite(TFT_MOSI, (val & 0x80) != 0);
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digitalWrite(TFT_SCK, HIGH);
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digitalWrite(TFT_SCK, LOW);
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val <<= 1;
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}
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if (bits == 0) {
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digitalWrite(TFT_CS, HIGH);
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return 0;
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}
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pinMode(TFT_MOSI, INPUT_PULLUP);
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digitalWrite(TFT_DC, HIGH);
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for (int i = 0; i < dummy; i++) { //any dummy clocks
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digitalWrite(TFT_SCK, HIGH);
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digitalWrite(TFT_SCK, LOW);
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}
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for (int i = 0; i < bits; i++) { // read results
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ret <<= 1;
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if (digitalRead(TFT_MOSI)) ret |= 1;;
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digitalWrite(TFT_SCK, HIGH);
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digitalWrite(TFT_SCK, LOW);
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}
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digitalWrite(TFT_CS, HIGH);
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return ret;
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}
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void showreg(uint8_t reg, uint8_t bits, uint8_t dummy)
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{
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uint32_t val;
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val = readwrite8(reg, bits, dummy);
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Serial.print("Register 0x");
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if (reg < 0x10) Serial.print("0");
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Serial.print(reg , HEX);
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Serial.print(": 0x");
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if (val < 0x10) Serial.print("0");
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Serial.println(val, HEX);
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}
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void setup() {
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// put your setup code here, to run once:
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uint32_t ID = 0;
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Serial.begin(115200);
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delay(4000); // Delay to allow USB to connect to a Leonardo etc
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Serial.println("TFT driver register values:");
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Serial.println("===========================");
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digitalWrite(TFT_CS, HIGH);
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// digitalWrite(TFT_SCK, HIGH);
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pinMode(TFT_CS, OUTPUT);
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pinMode(TFT_SCK, OUTPUT);
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pinMode(TFT_MOSI, OUTPUT);
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pinMode(MISO, INPUT_PULLUP);
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pinMode(TFT_DC, OUTPUT);
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pinMode(TFT_RESET, OUTPUT);
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digitalWrite(TFT_RESET, HIGH);
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digitalWrite(TFT_RESET, LOW); //Hardware Reset
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delay(50);
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digitalWrite(TFT_RESET, HIGH);
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showreg(0x01, 0, 0); //Software Reset
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delay(100);
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ID = readwrite8(0x04, 24, 1);
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if ((ID & 0xFF8000) == 0x5C8000uL) chip = "ST7735 (based on datasheet ID)";
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if (ID == 0x7C89F0uL) chip = "ST7735S (empirical value)";
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if (ID == 0x548066uL) chip = "ILI9163C (based on datasheet ID)";
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if (ID == 0x5C0000uL) chip = "S6D02A1 (based on datasheet ID)";
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showreg(0x04, 24, 1); //RDDID
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showreg(0x09, 32, 1); //RDSTATUS
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showreg(0x0A, 8, 0);
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showreg(0x0B, 8, 0);
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showreg(0x0C, 8, 0);
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showreg(0x0D, 8, 0);
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showreg(0x0E, 8, 0);
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showreg(0x0F, 8, 0);
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showreg(0x2E, 24, 8); //readGRAM
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showreg(0x3F, 32, 1); //readGRAM
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showreg(0xDA, 8, 0);
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showreg(0xDB, 8, 0);
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showreg(0xDC, 8, 0);
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Serial.println("===========================");
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Serial.println();
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Serial.print("Looks like driver chip is: " );Serial.println(chip);
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}
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void loop() {
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}
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