Milo Pan / Mbed 2 deprecated Etch_A_Sketch_uLCD

Etch a Sketch on the uLCD screen with wheel encoders as the knobs.

Dependencies:   4DGL-uLCD-SE mbed

main.cpp@0:c1245c18d07e, 2017-03-13 (annotated)

Committer:
simplyellow
Date:
Mon Mar 13 21:51:12 2017 +0000
Revision:
0:c1245c18d07e
Child:
1:876e9cc9088b
directional encoder works;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
simplyellow 0:c1245c18d07e 1 #include "mbed.h"
simplyellow 0:c1245c18d07e 2
simplyellow 0:c1245c18d07e 3 //#include "uLCD_4DGL.h"
simplyellow 0:c1245c18d07e 4
simplyellow 0:c1245c18d07e 5 Serial pc(USBTX, USBRX);
simplyellow 0:c1245c18d07e 6
simplyellow 0:c1245c18d07e 7 InterruptIn chA(p26);
simplyellow 0:c1245c18d07e 8 InterruptIn chB(p25);
simplyellow 0:c1245c18d07e 9 int chanA;
simplyellow 0:c1245c18d07e 10 int chanB;
simplyellow 0:c1245c18d07e 11 int currState;
simplyellow 0:c1245c18d07e 12 int prevState;
simplyellow 0:c1245c18d07e 13 int change;
simplyellow 0:c1245c18d07e 14
simplyellow 0:c1245c18d07e 15
simplyellow 0:c1245c18d07e 16 //uLCD_4GDL uLCD(p9,p10,p11);
simplyellow 0:c1245c18d07e 17 volatile int count1 = 0;
simplyellow 0:c1245c18d07e 18 //volatile int count2 = 0;
simplyellow 0:c1245c18d07e 19 InterruptIn pb(p21);
simplyellow 0:c1245c18d07e 20 DigitalOut led(LED1);
simplyellow 0:c1245c18d07e 21
simplyellow 0:c1245c18d07e 22
simplyellow 0:c1245c18d07e 23 /*
simplyellow 0:c1245c18d07e 24 Implemented barebones version of "QEI.h" by Aaron Berk for the sake of
simplyellow 0:c1245c18d07e 25 understanding the concept of X4 encoding
simplyellow 0:c1245c18d07e 26 00 01 11 10 00
simplyellow 0:c1245c18d07e 27 4 different states
simplyellow 0:c1245c18d07e 28 */
simplyellow 0:c1245c18d07e 29
simplyellow 0:c1245c18d07e 30 void encode() {
simplyellow 0:c1245c18d07e 31 change = 0;
simplyellow 0:c1245c18d07e 32 chanA = chA.read();
simplyellow 0:c1245c18d07e 33 chanB = chB.read();
simplyellow 0:c1245c18d07e 34 currState = (chanA << 1) | (chanB);
simplyellow 0:c1245c18d07e 35 if (((currState ^ prevState) != 0x3) && (currState != prevState)) {
simplyellow 0:c1245c18d07e 36 // example 01 <- 11
simplyellow 0:c1245c18d07e 37 // change = (11&01 = 01) ^ (01&10 = 00>>1) = 1
simplyellow 0:c1245c18d07e 38 // example 10 -> 00
simplyellow 0:c1245c18d07e 39 // change = (10&01 = 00) ^ (00&10 = 00>>1) = 0
simplyellow 0:c1245c18d07e 40 // change = (if(left) ^
simplyellow 0:c1245c18d07e 41
simplyellow 0:c1245c18d07e 42 change = (prevState & 0x1) ^ ((currState & 0x2) >> 1);
simplyellow 0:c1245c18d07e 43 if (change == 0) {
simplyellow 0:c1245c18d07e 44 change = -1;
simplyellow 0:c1245c18d07e 45 }
simplyellow 0:c1245c18d07e 46 count1 += change;
simplyellow 0:c1245c18d07e 47 }
simplyellow 0:c1245c18d07e 48 prevState = currState;
simplyellow 0:c1245c18d07e 49 }
simplyellow 0:c1245c18d07e 50 void clear() {
simplyellow 0:c1245c18d07e 51 //uLCD.cls();
simplyellow 0:c1245c18d07e 52 led = !led;
simplyellow 0:c1245c18d07e 53 }
simplyellow 0:c1245c18d07e 54
simplyellow 0:c1245c18d07e 55 int main() {
simplyellow 0:c1245c18d07e 56 chA.mode(PullUp);
simplyellow 0:c1245c18d07e 57 chB.mode(PullUp);
simplyellow 0:c1245c18d07e 58
simplyellow 0:c1245c18d07e 59 chanA = chA.read();
simplyellow 0:c1245c18d07e 60 chanB = chB.read();
simplyellow 0:c1245c18d07e 61 currState = (chanA << 1) | (chanB);
simplyellow 0:c1245c18d07e 62 prevState = currState;
simplyellow 0:c1245c18d07e 63 chA.rise(&encode);
simplyellow 0:c1245c18d07e 64 chA.fall(&encode);
simplyellow 0:c1245c18d07e 65 chB.rise(&encode);
simplyellow 0:c1245c18d07e 66 chB.fall(&encode);
simplyellow 0:c1245c18d07e 67
simplyellow 0:c1245c18d07e 68
simplyellow 0:c1245c18d07e 69 pb.mode(PullUp);
simplyellow 0:c1245c18d07e 70 pb.fall(&clear); //pb to clear screen
simplyellow 0:c1245c18d07e 71 //add a pb to turn on and off pen
simplyellow 0:c1245c18d07e 72 //add a pot to go through colors
simplyellow 0:c1245c18d07e 73 //have something display current color and RGB val
simplyellow 0:c1245c18d07e 74 while(1) {
simplyellow 0:c1245c18d07e 75 /*if(count1 < 0) {
simplyellow 0:c1245c18d07e 76 pc.printf("CW \n\r");
simplyellow 0:c1245c18d07e 77 } else {
simplyellow 0:c1245c18d07e 78 pc.printf("CCW \n\r");
simplyellow 0:c1245c18d07e 79 }*/
simplyellow 0:c1245c18d07e 80
simplyellow 0:c1245c18d07e 81 pc.printf("count1: %d\r\n", count1);
simplyellow 0:c1245c18d07e 82 pc.printf("change: %d\r\n", change);
simplyellow 0:c1245c18d07e 83 pc.printf("---------\r\n");
simplyellow 0:c1245c18d07e 84 wait(.1);
simplyellow 0:c1245c18d07e 85 }
simplyellow 0:c1245c18d07e 86 }