I've been working with an Arduino Uno for a few months and now I have an Embedded Artists’ 3.2 inch QVGA TFT Color LCD Board I'm trying to get working with the Arduino. Been struggling with it the last week with no progress.
I've read on the forums about the touch LCD screen Arduino shield using the same driver, but I wasn't able to see the pinout for the files. So I've been trying just to turn the LCD on and writing to the register properly. At first, I tried it with SPI
/*
Pin settings
SPI Pins
Pin 10 = SS/CS //slave select or Chip Select
Pin 11 = MOSI // Master Out Slave In
Pin 12 = MISO // Master In Slave Out
Pin 13 = SCK //System Clock, used to sync pulses
Pin 9 = RS // Register Set input: low for Commands and high for GRAM
*/
#include <SPI.h>
//PINS
const int RS = 9; //Active low commands or Active high for ram writing
const int CS = 10; //chip select/slave select for LCD
const int MOSI = 11; //Master Out Slave In
const int MISO = 12; // Master In Slave Out
const int SCK = 13; //Serial Clock, used to sync pulses
int i = 0;
byte responseOne = 0;
byte responseTwo = 0;
void setup(){
Serial.begin(9600);
//initiate SPI pins
SPI.begin();
//start shifting with MSB MSB (bit 7, bit 6, etc)
SPI.setBitOrder(MSBFIRST);
//samples on rise, idle low
SPI.setDataMode(SPI_MODE1);
//set SPI speed to 8 MHz
SPI.setClockDivider(SPI_CLOCK_DIV2);
//set pin modes
pinMode(RS, OUTPUT);
delay(30);
//initialize the LCD
LCD_Reset();
Serial.println('Initialization complete\n');
}
void loop(){
delay(500);
Serial.print('Round:');
Serial.println(i);
//set the cursor position
WriteToLCD(0x004E,i);
WriteToLCD(0x004F,i);
//set pixel color
WriteToLCD(0x0022,0xF0F0);
i++;
}
void WriteToLCD(word address, word value){
//move to command address
digitalWrite(RS,LOW); //instruction to accept ram position
digitalWrite(CS,LOW); //activate LCD for serial transmission
byte temp = highByte(address); //takes the leftmost byte of 'address'
responseOne = SPI.transfer(temp); //sends the value via SPI
temp = lowByte(address); //takes the rightmost byte of 'address'
responseTwo = SPI.transfer(temp); //sends the value via SPI
digitalWrite(CS,HIGH); //deactivate LCD for serial transmission
Serial.print("Address: ");
Serial.print(address,HEX);
Serial.print(" Response: ");
Serial.print(responseOne,HEX);
Serial.print(" ");
Serial.print(responseTwo,HEX);
//enter in command
digitalWrite(RS,HIGH); //instruction to enter command
digitalWrite(CS,LOW); //activate LCD for serial transmission
temp = highByte(value); //takes the leftmost byte of 'value'
responseOne = SPI.transfer(temp); //sends the value via SPI
temp = lowByte(value); //takes the rightmost byte of 'value'
responseTwo = SPI.transfer(temp); //sends the value via SPI
digitalWrite(CS,HIGH); //deactivate LCD for serial transmission
Serial.print(" Command: ");
Serial.print(value,HEX);
Serial.print(" Response: ");
Serial.print(responseOne,HEX);
Serial.print(" ");
Serial.println(responseTwo,HEX);
}
void LCD_Reset(void)
{
WriteToLCD(0x0007, 0x0021); // Display Control
// D1 0x0000 = display off
// D1 0x0002 = display on
// D0 0x0000 = internal display halt
// D0 0x0001 = internal display operate
WriteToLCD(0x0000, 0x0001); //Start Oscillation OSCEN=1
WriteToLCD(0x0007, 0x0023); // Display Control
WriteToLCD(0x0010, 0x0000); //Sleep mode cancel
delay(30);
WriteToLCD(0x0007, 0x0033); // Display Control
WriteToLCD(0x0011, 0x6030); //Entry Mode
// DFM 0x4000 = 262k color
// DFM 0x6000 = 65k color
// AM 0x0000 = horizontal display
// AM 0x0008 = Vertical display
// ID[0] 0x0000 = horizontal decrement
// ID[0] 0x0010 = horizontal increment
// ID[1] 0x0000 = Vertical decrement
// ID[1] 0x0020 = Vertical increment
WriteToLCD(0x0002, 0x0000); //LCD driver AC setting
WriteToLCD(0x0022, 0x0000); //write to ram
}
I couldn't confirm if my registry edits were bad or if my writing to the GRam is faulty. I moved over trying parallel but I can't even get the LCD to turn on.
3.2_inch_QVGA_TFT_Color_LCD_Users_Guide-Version_2.1_Rev_A.pdf (436 KB)
3.2TFT_IC-SSD1289.pdf (859 KB)