First, obligatory both new to Arduino and new to the forum so please have some patience with me.
I am using a Arduino Mega 2560 to control an Ada fruit 2.8" TFT LCD display via hardware SPI. the controller for the LCD is an ILI9341. When I run the following code, I am supposed to get a 8x8 checkerboard pattern and for the most part I do. The problem is that part way through drawing some of the rectangles, it switches to a random, undefined color. Here is an example of what I mean:
Here is my code:
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
// A couple of pins.
#define TFT_DC 44
#define TFT_CS 45
// My colors for the display.
#define BLACK 0x0000
#define WHITE 0xFFFF
#define BLUE_SQUARE 0x759B
#define GRAY_SQUARE 0xA534
// Define the visual LCD.
// Use hardware SPI and the pin numbers defined above for CS/DC.
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
void setup() {
// Initialive the visual LCD.
tft.begin();
tft.setRotation(0);
tft.fillScreen(BLACK);
tft.drawRect(3, 3, 2, 233, WHITE); // Left border of board.
tft.drawRect(3, 3, 233, 2, WHITE); // Top border of board.
tft.drawRect(235, 3, 2, 233, WHITE); // Right border of board.
tft.drawRect(3, 235, 234, 2, WHITE); // Bottom border of board.
init_board(); // This function will initialize the board on the LCD.
}
void loop() {
// put your main code here, to run repeatedly:
}
void init_board(){ // This function is called in setup but it cleans up the setup loop some.
// This section of code will initialize the chess board squares and also put the chess pieces on their starting squares.
// Initialize board squares. First, we initialize some of the vaiables that we will need.
int cursorX = -1;
int cursorY = 0;
int color_init_toggle = 1;
int COLOR = GRAY_SQUARE;
int x = 0;
int y = 0;
// There are 64 squares on a chess board.
for (byte i = 0; i < 64; i++){
// We add one the the X position, and if that X position is off the board, we set it X to zero and then add one the the Y axis.
cursorX = cursorX + 1;
if (cursorX > 7){
cursorY++;
cursorX = 0;
if ((cursorY % 2) == 0){color_init_toggle = 1;} // This is here so that the board will have the correct checkers pattern. Otherwise, The board comes out as columns.
else{color_init_toggle = 0;}
}
// We set the color for the square and then switch the value of the toggle so the next square is the opposite color.
if (color_init_toggle == 0){
COLOR = BLUE_SQUARE;
color_init_toggle = 1;}
else{
COLOR = GRAY_SQUARE;
color_init_toggle = 0;}
// After that, we set the location in x and y for the top left of the square and then draw out a solid rectangle.
x = (4+(cursorX*29)); // Each square is 29 pixels by 29 pixels and there is a border of 4 pixes before you get to the game board.
y = (4+(cursorY*29));
// The format here is simple: X pos of top left corner, then the Y pos for the same. the the width of the rect, then the height of the rectange. lastly, the color of the rectangle.
tft.fillRect(x, y, 29, 29, COLOR);
}
}
If anyone has any ideas or suggestions, I would greatly appreciate them. Thanks is advance.
