@david_prentice: I meant Himax, well spotted! I remember seeing a 1.8" display with a HX---- driver advertised, but I am not sure where I saw it. Yes you are right, ILI9163/S6D02A1/ST7735 are all options often advertised for 1.8" displays.
@slessard: Your PCB has different track routing to mine.
Below is a sketch that might help identify the driver. I have used the ID's from the data sheets for the ILI9163/S6D02A1/ST7735S drivers.
// Read the ID from the TFT controller
// The sketch only supports displays with a bi-directional SPI data line (often labelled SDA)
// Bit bashes SPI so it does NOT assume hardware SPI wired up
// No other libraries are needed
// Original author unknown
// Adapted by Bodmer 22/5/16, updated 16/9/16
// Change the pin settings to suit your hardware
// UNO etc
//#define TFT_MOSI 11
//#define TFT_SCK 13
//#define TFT_CS 9
//#define TFT_DC 8
//#define TFT_RESET 7
//Mega
#define TFT_MOSI 51
#define TFT_SCK 52
#define TFT_CS 47
#define TFT_DC 48
#define TFT_RESET 44
/* Example Serial Monitor output:
TFT driver register values:
===========================
Register 0x01: 0x00
Register 0x04: 0x548066
Register 0x09: 0x610000
Register 0x0A: 0x08
Register 0x0B: 0x00
Register 0x0C: 0x06
Register 0x0D: 0x00
Register 0x0E: 0x00
Register 0x0F: 0x00
Register 0x2E: 0x1834B4
Register 0xDA: 0x54
Register 0xDB: 0x80
Register 0xDC: 0x66
===========================
Looks like driver chip is: ILI9163 (based on datasheet ID)
*/
char *chip = "Unknown ";
uint32_t readwrite8(uint8_t cmd, uint8_t bits, uint8_t dummy)
{
uint32_t ret = 0;
uint8_t val = cmd;
int cnt = 8;
digitalWrite(TFT_CS, LOW);
digitalWrite(TFT_DC, LOW);
pinMode(TFT_MOSI, OUTPUT);
for (int i = 0; i < 8; i++) { //send command
digitalWrite(TFT_MOSI, (val & 0x80) != 0);
digitalWrite(TFT_SCK, HIGH);
digitalWrite(TFT_SCK, LOW);
val <<= 1;
}
if (bits == 0) {
digitalWrite(TFT_CS, HIGH);
return 0;
}
pinMode(TFT_MOSI, INPUT_PULLUP);
digitalWrite(TFT_DC, HIGH);
for (int i = 0; i < dummy; i++) { //any dummy clocks
digitalWrite(TFT_SCK, HIGH);
digitalWrite(TFT_SCK, LOW);
}
for (int i = 0; i < bits; i++) { // read results
ret <<= 1;
if (digitalRead(TFT_MOSI)) ret |= 1;;
digitalWrite(TFT_SCK, HIGH);
digitalWrite(TFT_SCK, LOW);
}
digitalWrite(TFT_CS, HIGH);
return ret;
}
void showreg(uint8_t reg, uint8_t bits, uint8_t dummy)
{
uint32_t val;
val = readwrite8(reg, bits, dummy);
Serial.print("Register 0x");
if (reg < 0x10) Serial.print("0");
Serial.print(reg , HEX);
Serial.print(": 0x");
if (val < 0x10) Serial.print("0");
Serial.println(val, HEX);
}
void setup() {
// put your setup code here, to run once:
uint32_t ID = 0;
Serial.begin(9600);
Serial.println("TFT driver register values:");
Serial.println("===========================");
digitalWrite(TFT_CS, HIGH);
// digitalWrite(TFT_SCK, HIGH);
pinMode(TFT_CS, OUTPUT);
pinMode(TFT_SCK, OUTPUT);
pinMode(TFT_MOSI, OUTPUT);
pinMode(MISO, INPUT_PULLUP);
pinMode(TFT_DC, OUTPUT);
pinMode(TFT_RESET, OUTPUT);
digitalWrite(TFT_RESET, HIGH);
digitalWrite(TFT_RESET, LOW); //Hardware Reset
delay(50);
digitalWrite(TFT_RESET, HIGH);
showreg(0x01, 0, 0); //Software Reset
delay(100);
ID = readwrite8(0x04, 24, 1);
if ((ID & 0xFF8000) == 0x5C8000uL) chip = "ST7735 (based on datasheet ID)";
if (ID == 0x7C89F0uL) chip = "ST7735 (empirical value)";
if (ID == 0x548066uL) chip = "ILI9163 (based on datasheet ID)";
if (ID == 0x5C0000uL) chip = "S6D02A1 (based on datasheet ID)";
showreg(0x04, 24, 1); //RDDID
showreg(0x09, 32, 1); //RDSTATUS
showreg(0x0A, 8, 0);
showreg(0x0B, 8, 0);
showreg(0x0C, 8, 0);
showreg(0x0D, 8, 0);
showreg(0x0E, 8, 0);
showreg(0x0F, 8, 0);
showreg(0x2E, 24, 8); //readGRAM
showreg(0xDA, 8, 0);
showreg(0xDB, 8, 0);
showreg(0xDC, 8, 0);
Serial.println("===========================");
Serial.println();
Serial.print("Looks like driver chip is: " );Serial.println(chip);
}
void loop() {
}
Interestingly it reports my display as having an ILI9163 but I am using initialisation code from this library for a S6D02A1 and it works OK but that may just be by luck and a degree of initialisation address compatibility.
Can you tell me where you got your display and what the ID reading sketch reports in the Serial Monitor window (9600 baud)?
