Richard Kuo / Mbed OS NTOUEE-mbed-I2C_LCD_movingcircle

mbed I2C to LCD for drawing a moving circle

main.cpp@0:5e40d147a8e1, 2016-10-20 (annotated)

Committer:
rkuo2000
Date:
Thu Oct 20 13:05:10 2016 +0000
Revision:
0:5e40d147a8e1
mbed I2C to LCD for drawing a moving circle

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rkuo2000 0:5e40d147a8e1 1 // using NuMaker-PFM-NUC472 I2C1 to draw a moving circle on LCD
rkuo2000 0:5e40d147a8e1 2 #include "mbed.h"
rkuo2000 0:5e40d147a8e1 3 #include "math.h"
rkuo2000 0:5e40d147a8e1 4 #include "ssd1306.h"
rkuo2000 0:5e40d147a8e1 5 #include "draw2D.h"
rkuo2000 0:5e40d147a8e1 6
rkuo2000 0:5e40d147a8e1 7 #define PI 3.1415926535
rkuo2000 0:5e40d147a8e1 8
rkuo2000 0:5e40d147a8e1 9 #define X0 15 // Circle initial X
rkuo2000 0:5e40d147a8e1 10 #define Y0 10 // Circle initial Y
rkuo2000 0:5e40d147a8e1 11
rkuo2000 0:5e40d147a8e1 12 I2C i2c1(PD_12, PD_10); // I2C1_SDA, I2C1_SCL
rkuo2000 0:5e40d147a8e1 13
rkuo2000 0:5e40d147a8e1 14 SSD1306 LCD; // LCD connected on I2C1
rkuo2000 0:5e40d147a8e1 15 Draw2D D2D; // Draw2D library
rkuo2000 0:5e40d147a8e1 16
rkuo2000 0:5e40d147a8e1 17 int main() {
rkuo2000 0:5e40d147a8e1 18
rkuo2000 0:5e40d147a8e1 19 int dirX, dirY;
rkuo2000 0:5e40d147a8e1 20 int movX, movY;
rkuo2000 0:5e40d147a8e1 21 int r;
rkuo2000 0:5e40d147a8e1 22 int x, y;
rkuo2000 0:5e40d147a8e1 23
rkuo2000 0:5e40d147a8e1 24 i2c1.frequency(400000);
rkuo2000 0:5e40d147a8e1 25
rkuo2000 0:5e40d147a8e1 26 LCD.initialize();
rkuo2000 0:5e40d147a8e1 27 LCD.clearscreen();
rkuo2000 0:5e40d147a8e1 28
rkuo2000 0:5e40d147a8e1 29 x = X0; // circle center x
rkuo2000 0:5e40d147a8e1 30 y = Y0; // circle center y
rkuo2000 0:5e40d147a8e1 31 r = 3; // circle radius
rkuo2000 0:5e40d147a8e1 32
rkuo2000 0:5e40d147a8e1 33 movX = 3; // x movement
rkuo2000 0:5e40d147a8e1 34 movY = 3; // y movement
rkuo2000 0:5e40d147a8e1 35 dirX = 1; // x direction
rkuo2000 0:5e40d147a8e1 36 dirY = 1; // y direction
rkuo2000 0:5e40d147a8e1 37
rkuo2000 0:5e40d147a8e1 38 while(true) {
rkuo2000 0:5e40d147a8e1 39 D2D.drawCircle(x, y, r, FG_COLOR, BG_COLOR); // draw a circle
rkuo2000 0:5e40d147a8e1 40
rkuo2000 0:5e40d147a8e1 41 Thread::wait(1); // Delay for Vision
rkuo2000 0:5e40d147a8e1 42
rkuo2000 0:5e40d147a8e1 43 D2D.drawCircle(x, y, r, BG_COLOR, BG_COLOR); // erase a circle
rkuo2000 0:5e40d147a8e1 44
rkuo2000 0:5e40d147a8e1 45 x = x + dirX * movX; // change x of circle center
rkuo2000 0:5e40d147a8e1 46 y = y + dirY * movY; // change y of circle center
rkuo2000 0:5e40d147a8e1 47
rkuo2000 0:5e40d147a8e1 48 // boundary check for changing direction
rkuo2000 0:5e40d147a8e1 49 if ((x-r) <=0) {dirX= 1; x= x + dirX*movX;}
rkuo2000 0:5e40d147a8e1 50 else if ((x+r) >=LCD_Xmax) {dirX=-1; x= x + dirX*movX;}
rkuo2000 0:5e40d147a8e1 51
rkuo2000 0:5e40d147a8e1 52 if ((y-r) <=0) {dirY= 1; y= y + dirY*movY;}
rkuo2000 0:5e40d147a8e1 53 else if ((y+r) >=LCD_Ymax) {dirY=-1; y= y + dirY*movY;}
rkuo2000 0:5e40d147a8e1 54 }
rkuo2000 0:5e40d147a8e1 55 }