David Bottrill / Mbed 2 deprecated Trinket_remote

This is a port of the Adafruit Trinket (Arduino) universal Infrared receiver. The should produce a unique code for every key on virtually any Infrared Remote control

Dependencies:   mbed

main.cpp@0:0124991faa9d, 2015-05-19 (annotated)

Committer:
djbottrill
Date:
Tue May 19 09:43:35 2015 +0000
Revision:
0:0124991faa9d
It works!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
djbottrill 0:0124991faa9d 1
djbottrill 0:0124991faa9d 2 /* Trinket/Gemma compatible Raw IR decoder sketch
djbottrill 0:0124991faa9d 3 This sketch/program uses an Adafruit Trinket or Gemma
djbottrill 0:0124991faa9d 4 ATTiny85 based mini microcontroller and a PNA4602 to
djbottrill 0:0124991faa9d 5 decode IR received. This can be used to make a IR receiver
djbottrill 0:0124991faa9d 6 (by looking for a particular code) or transmitter
djbottrill 0:0124991faa9d 7 (by pulsing an IR LED at ~38KHz for the durations detected
djbottrill 0:0124991faa9d 8
djbottrill 0:0124991faa9d 9 Based on Adafruit tutorial http://learn.adafruit.com/ir-sensor/using-an-ir-sensor
djbottrill 0:0124991faa9d 10
djbottrill 0:0124991faa9d 11 and ATTiny program by TinyPCRemote Nathan Chantrell http://nathan.chantrell.net
djbottrill 0:0124991faa9d 12 under Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license
djbottrill 0:0124991faa9d 13
djbottrill 0:0124991faa9d 14 Modified to work on MBed by David Bottrill May 2015
djbottrill 0:0124991faa9d 15 This has been tested on a KL25z using a Grove IR sensor with a number of different
djbottrill 0:0124991faa9d 16 Infrared Remote controls.
djbottrill 0:0124991faa9d 17
djbottrill 0:0124991faa9d 18 */
djbottrill 0:0124991faa9d 19 #include "mbed.h"
djbottrill 0:0124991faa9d 20
djbottrill 0:0124991faa9d 21 #define MAXPULSE 10000 // the maximum pulse we'll listen for - 10 milliseconds
djbottrill 0:0124991faa9d 22 #define NUMPULSES 200 // max IR pulse pairs to sample
djbottrill 0:0124991faa9d 23 #define RESOLUTION 1 // time between IR measurements ~1uS
djbottrill 0:0124991faa9d 24
djbottrill 0:0124991faa9d 25 // we will store up to 200 pulse pairs (this is -a lot-)
djbottrill 0:0124991faa9d 26 uint16_t pulses[200][2]; // pair is high and low pulse
djbottrill 0:0124991faa9d 27 uint16_t currentpulse = 0; // index for pulses we're storing
djbottrill 0:0124991faa9d 28 uint32_t irCode = 0;
djbottrill 0:0124991faa9d 29 Serial pc(USBTX, USBRX); // tx, rx
djbottrill 0:0124991faa9d 30 DigitalIn IRpin (D2); // Listen to IR receiver on Trinket/Gemma pin D2
djbottrill 0:0124991faa9d 31
djbottrill 0:0124991faa9d 32 int listenForIR(void); // IR receive code
djbottrill 0:0124991faa9d 33 void printcode(void); // Print IR code in HEX
djbottrill 0:0124991faa9d 34
djbottrill 0:0124991faa9d 35 int main(void)
djbottrill 0:0124991faa9d 36 {
djbottrill 0:0124991faa9d 37 pc.printf("Ready to decode IR!\n");
djbottrill 0:0124991faa9d 38
djbottrill 0:0124991faa9d 39 while (1) {
djbottrill 0:0124991faa9d 40
djbottrill 0:0124991faa9d 41 int numpulse=listenForIR(); // Wait for an IR Code
djbottrill 0:0124991faa9d 42
djbottrill 0:0124991faa9d 43 // Process the pulses to get a single number representing code
djbottrill 0:0124991faa9d 44 for (int i = 0; i < 32; i++) {
djbottrill 0:0124991faa9d 45 irCode=irCode<<1;
djbottrill 0:0124991faa9d 46 if((pulses[i][0] * RESOLUTION)>0&&(pulses[i][0] * RESOLUTION)<500) {
djbottrill 0:0124991faa9d 47 irCode|=0;
djbottrill 0:0124991faa9d 48 } else {
djbottrill 0:0124991faa9d 49 irCode|=1;
djbottrill 0:0124991faa9d 50 }
djbottrill 0:0124991faa9d 51 }
djbottrill 0:0124991faa9d 52
djbottrill 0:0124991faa9d 53 printcode(); // Print IR code
djbottrill 0:0124991faa9d 54 wait_ms(100);
djbottrill 0:0124991faa9d 55
djbottrill 0:0124991faa9d 56 } //end of main loop
djbottrill 0:0124991faa9d 57 }
djbottrill 0:0124991faa9d 58
djbottrill 0:0124991faa9d 59
djbottrill 0:0124991faa9d 60 int listenForIR(void){ // IR receive code
djbottrill 0:0124991faa9d 61 currentpulse = 0;
djbottrill 0:0124991faa9d 62 while (1) {
djbottrill 0:0124991faa9d 63 unsigned int highpulse, lowpulse; // temporary storage timing
djbottrill 0:0124991faa9d 64 highpulse = lowpulse = 0; // start out with no pulse length
djbottrill 0:0124991faa9d 65
djbottrill 0:0124991faa9d 66 while (IRpin==1) { // got a high pulse
djbottrill 0:0124991faa9d 67 highpulse++;
djbottrill 0:0124991faa9d 68 wait_us(RESOLUTION);
djbottrill 0:0124991faa9d 69 if (((highpulse >= MAXPULSE) && (currentpulse != 0))|| currentpulse == NUMPULSES) {
djbottrill 0:0124991faa9d 70 return currentpulse;
djbottrill 0:0124991faa9d 71 }
djbottrill 0:0124991faa9d 72 }
djbottrill 0:0124991faa9d 73 pulses[currentpulse][0] = highpulse;
djbottrill 0:0124991faa9d 74
djbottrill 0:0124991faa9d 75 while (IRpin==0) { // got a low pulse
djbottrill 0:0124991faa9d 76 lowpulse++;
djbottrill 0:0124991faa9d 77 wait_us(RESOLUTION);
djbottrill 0:0124991faa9d 78 if (((lowpulse >= MAXPULSE) && (currentpulse != 0))|| currentpulse == NUMPULSES) {
djbottrill 0:0124991faa9d 79 return currentpulse;
djbottrill 0:0124991faa9d 80 }
djbottrill 0:0124991faa9d 81 }
djbottrill 0:0124991faa9d 82 pulses[currentpulse][1] = lowpulse;
djbottrill 0:0124991faa9d 83 currentpulse++;
djbottrill 0:0124991faa9d 84 }
djbottrill 0:0124991faa9d 85 }
djbottrill 0:0124991faa9d 86
djbottrill 0:0124991faa9d 87 void printcode(void)
djbottrill 0:0124991faa9d 88 {
djbottrill 0:0124991faa9d 89 uint16_t half;
djbottrill 0:0124991faa9d 90 half=irCode>>16; // Get first 16 bits of code
djbottrill 0:0124991faa9d 91 pc.printf("0x%x",half); // Print upper 16 bits in hex
djbottrill 0:0124991faa9d 92 pc.printf("%x\n",(irCode & 0xFFFF)); // print lower 16 bits in hex
djbottrill 0:0124991faa9d 93 }
djbottrill 0:0124991faa9d 94