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/*
RI Codes:
TAPE = 42157
DVD = 31612
CD = 71327
PORT = 81993
CDR = 71322
MD = 71808
*/
#include "signals.h"
// Digital pin #2 is the same as Pin D2 see
// http://arduino.cc/en/Hacking/PinMapping168 for the 'raw' pin mapping
#define IRpin_PIN PINB
#define IRpin 0
#define ARRAY_LEN(array) (sizeof(array)/sizeof(array[0]))
#define MAXPULSE 500
#define RESOLUTION 20
#define FUZZINESS 20
int header[] = {300, 100};
int values[2][2] = { {100, 100}, {100, 200} };
int trail[] = { 100 };
uint8_t bits = 12;
uint8_t raw[2];
uint64_t listenForIR(void);
int getPulseLength();
int getPulseLengthInRange(int expected);
void setup(void) {
Serial.begin(9600);
Serial.println("Ready to decode IR!");
pinMode(13, OUTPUT);
}
void loop(void) {
uint64_t code = listenForIR();
Serial.println(code, HEX);
}
int getPulseLength() {
bool high = IRpin_PIN & (1 << IRpin);
bool check = true;
int length = 0;
while (check) {
length++;
delayMicroseconds(RESOLUTION);
if (length >= MAXPULSE) {
return -1;
}
check = IRpin_PIN & (1 << IRpin);
if (! high) {
check = ! check;
}
}
return length * RESOLUTION / 10;
}
bool inRange(int value, int expected) {
return (abs(value - expected) <= FUZZINESS);
}
int getPulseLengthInRange(int expected) {
int length = getPulseLength();
if (!inRange(length, expected)) {
length = 0;
}
return length;
}
uint64_t listenForIR(void) {
int length;
uint64_t code;
uint8_t i;
start:
code = 0;
for (i = 0; i < ARRAY_LEN(header); i++) {
length = getPulseLengthInRange(header[i]);
if ((length == 0) || (length < 0))
goto start;
}
for (uint8_t j = 0; j < bits; j++) {
for (i = 0; i < ARRAY_LEN(raw); i++) {
raw[i] = getPulseLength();
if ((raw[i] == 0) || (raw[i] < 0))
goto start;
}
bool found;
for (uint8_t k = 0; k < ARRAY_LEN(values); k++) {
found = true;
for (i = 0; i < ARRAY_LEN(raw); i++) {
if (!inRange(raw[i], values[k][i])) {
found = false;
break;
}
}
if (found) {
code <<= 1;
code += k;
break;
}
}
if (!found) {
Serial.println(raw[0]);
Serial.println(raw[1]);
goto start;
}
}
for (i = 0; i < ARRAY_LEN(trail); i++) {
length = getPulseLengthInRange(trail[i]);
if ((length == 0) || (length < 0))
goto start;
}
return code;
}
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