Arduino/elegoo-kit-lessons/Lesson 13 IR Receiver Module/IRremote/examples/IRtest2/IRtest2.ino

/*
 * Test send/receive functions of IRremote, using a pair of Arduinos.
 *
 * Arduino #1 should have an IR LED connected to the send pin (3).
 * Arduino #2 should have an IR detector/demodulator connected to the
 * receive pin (11) and a visible LED connected to pin 3.
 *
 * The cycle:
 *  Arduino #1 will wait 2 seconds, then run through the tests.
 *  It repeats this forever.
 *  Arduino #2 will wait for at least one second of no signal
 *  (to synchronize with #1).  It will then wait for the same test
 *  signals.  It will log all the status to the serial port.  It will
 *  also indicate status through the LED, which will flash each time a test
 *  is completed.  If there is an error, it will light up for 5 seconds.
 *
 * The test passes if the LED flashes 19 times, pauses, and then repeats.
 * The test fails if the LED lights for 5 seconds.
 *
 * The test software automatically decides which board is the sender and which is
 * the receiver by looking for an input on the send pin, which will indicate
 * the sender.  You should hook the serial port to the receiver for debugging.
 *  
 * Copyright 2010 Ken Shirriff
 * http://arcfn.com
 */

#include <IRremote.h>

int RECV_PIN = 11;
int LED_PIN = 3;

IRrecv irrecv(RECV_PIN);
IRsend irsend;

decode_results results;

#define RECEIVER 1
#define SENDER 2
#define ERROR 3

int mode;

void setup()
{
  Serial.begin(9600);
  // Check RECV_PIN to decide if we're RECEIVER or SENDER
  if (digitalRead(RECV_PIN) == HIGH) {
    mode = RECEIVER;
    irrecv.enableIRIn();
    pinMode(LED_PIN, OUTPUT);
    digitalWrite(LED_PIN, LOW);
    Serial.println("Receiver mode");
  } 
  else {
    mode = SENDER;
    Serial.println("Sender mode");
  }
}

// Wait for the gap between tests, to synchronize with
// the sender.
// Specifically, wait for a signal followed by a gap of at last gap ms.
void waitForGap(int gap) {
  Serial.println("Waiting for gap");
  while (1) {
    while (digitalRead(RECV_PIN) == LOW) { 
    }
    unsigned long time = millis();
    while (digitalRead(RECV_PIN) == HIGH) {
      if (millis() - time > gap) {
        return;
      }
    }
  }
}

// Dumps out the decode_results structure.
// Call this after IRrecv::decode()
void dump(decode_results *results) {
  int count = results->rawlen;
  if (results->decode_type == UNKNOWN) {
    Serial.println("Could not decode message");
  } 
  else {
    if (results->decode_type == NEC) {
      Serial.print("Decoded NEC: ");
    } 
    else if (results->decode_type == SONY) {
      Serial.print("Decoded SONY: ");
    } 
    else if (results->decode_type == RC5) {
      Serial.print("Decoded RC5: ");
    } 
    else if (results->decode_type == RC6) {
      Serial.print("Decoded RC6: ");
    }
    Serial.print(results->value, HEX);
    Serial.print(" (");
    Serial.print(results->bits, DEC);
    Serial.println(" bits)");
  }
  Serial.print("Raw (");
  Serial.print(count, DEC);
  Serial.print("): ");

  for (int i = 0; i < count; i++) {
    if ((i % 2) == 1) {
      Serial.print(results->rawbuf[i]*USECPERTICK, DEC);
    } 
    else {
      Serial.print(-(int)results->rawbuf[i]*USECPERTICK, DEC);
    }
    Serial.print(" ");
  }
  Serial.println("");
}


// Test send or receive.
// If mode is SENDER, send a code of the specified type, value, and bits
// If mode is RECEIVER, receive a code and verify that it is of the
// specified type, value, and bits.  For success, the LED is flashed;
// for failure, the mode is set to ERROR.
// The motivation behind this method is that the sender and the receiver
// can do the same test calls, and the mode variable indicates whether
// to send or receive.
void test(char *label, int type, unsigned long value, int bits) {
  if (mode == SENDER) {
    Serial.println(label);
    if (type == NEC) {
      irsend.sendNEC(value, bits);
    } 
    else if (type == SONY) {
      irsend.sendSony(value, bits);
    } 
    else if (type == RC5) {
      irsend.sendRC5(value, bits);
    } 
    else if (type == RC6) {
      irsend.sendRC6(value, bits);
    } 
    else {
      Serial.print(label);
      Serial.println("Bad type!");
    }
    delay(200);
  } 
  else if (mode == RECEIVER) {
    irrecv.resume(); // Receive the next value
    unsigned long max_time = millis() + 30000;
    Serial.print(label);

    // Wait for decode or timeout
    while (!irrecv.decode(&results)) {
      if (millis() > max_time) {
        Serial.println("Timeout receiving data");
        mode = ERROR;
        return;
      }
    }
    if (type == results.decode_type && value == results.value && bits == results.bits) {
      Serial.println (": OK");
      digitalWrite(LED_PIN, HIGH);
      delay(20);
      digitalWrite(LED_PIN, LOW);
    } 
    else {
      Serial.println(": BAD");
      dump(&results);
      mode = ERROR;
    }
  }
}

// Test raw send or receive.  This is similar to the test method,
// except it send/receives raw data.
void testRaw(char *label, unsigned int *rawbuf, int rawlen) {
  if (mode == SENDER) {
    Serial.println(label);
    irsend.sendRaw(rawbuf, rawlen, 38 /* kHz */);
    delay(200);
  } 
  else if (mode == RECEIVER ) {
    irrecv.resume(); // Receive the next value
    unsigned long max_time = millis() + 30000;
    Serial.print(label);

    // Wait for decode or timeout
    while (!irrecv.decode(&results)) {
      if (millis() > max_time) {
        Serial.println("Timeout receiving data");
        mode = ERROR;
        return;
      }
    }

    // Received length has extra first element for gap
    if (rawlen != results.rawlen - 1) {
      Serial.print("Bad raw length ");
      Serial.println(results.rawlen, DEC);
      mode = ERROR;
      return;
    }
    for (int i = 0; i < rawlen; i++) {
      long got = results.rawbuf[i+1] * USECPERTICK;
      // Adjust for extra duration of marks
      if (i % 2 == 0) { 
        got -= MARK_EXCESS;
      } 
      else {
        got += MARK_EXCESS;
      }
      // See if close enough, within 25%
      if (rawbuf[i] * 1.25 < got || got * 1.25 < rawbuf[i]) {
        Serial.println(": BAD");
        dump(&results);
        mode = ERROR;
        return;
      }

    }
    Serial.println (": OK");
    digitalWrite(LED_PIN, HIGH);
    delay(20);
    digitalWrite(LED_PIN, LOW);
  }
}   

// This is the raw data corresponding to NEC 0x12345678
unsigned int sendbuf[] = { /* NEC format */
  9000, 4500,
  560, 560, 560, 560, 560, 560, 560, 1690, /* 1 */
  560, 560, 560, 560, 560, 1690, 560, 560, /* 2 */
  560, 560, 560, 560, 560, 1690, 560, 1690, /* 3 */
  560, 560, 560, 1690, 560, 560, 560, 560, /* 4 */
  560, 560, 560, 1690, 560, 560, 560, 1690, /* 5 */
  560, 560, 560, 1690, 560, 1690, 560, 560, /* 6 */
  560, 560, 560, 1690, 560, 1690, 560, 1690, /* 7 */
  560, 1690, 560, 560, 560, 560, 560, 560, /* 8 */
  560};

void loop() {
  if (mode == SENDER) {
    delay(2000);  // Delay for more than gap to give receiver a better chance to sync.
  } 
  else if (mode == RECEIVER) {
    waitForGap(1000);
  } 
  else if (mode == ERROR) {
    // Light up for 5 seconds for error
    digitalWrite(LED_PIN, HIGH);
    delay(5000);
    digitalWrite(LED_PIN, LOW);
    mode = RECEIVER;  // Try again
    return;
  }

  // The test suite.
  test("SONY1", SONY, 0x123, 12);
  test("SONY2", SONY, 0x000, 12);
  test("SONY3", SONY, 0xfff, 12);
  test("SONY4", SONY, 0x12345, 20);
  test("SONY5", SONY, 0x00000, 20);
  test("SONY6", SONY, 0xfffff, 20);
  test("NEC1", NEC, 0x12345678, 32);
  test("NEC2", NEC, 0x00000000, 32);
  test("NEC3", NEC, 0xffffffff, 32);
  test("NEC4", NEC, REPEAT, 32);
  test("RC51", RC5, 0x12345678, 32);
  test("RC52", RC5, 0x0, 32);
  test("RC53", RC5, 0xffffffff, 32);
  test("RC61", RC6, 0x12345678, 32);
  test("RC62", RC6, 0x0, 32);
  test("RC63", RC6, 0xffffffff, 32);

  // Tests of raw sending and receiving.
  // First test sending raw and receiving raw.
  // Then test sending raw and receiving decoded NEC
  // Then test sending NEC and receiving raw
  testRaw("RAW1", sendbuf, 67);
  if (mode == SENDER) {
    testRaw("RAW2", sendbuf, 67);
    test("RAW3", NEC, 0x12345678, 32);
  } 
  else {
    test("RAW2", NEC, 0x12345678, 32);
    testRaw("RAW3", sendbuf, 67);
  }
}