Hello Arduino-Experts,
I want to use IRMP to communicate with IR remotes and the respective IR controlled devices. I am currently using the IRMPforArduino library. IRMP decodes IR data frames and stores them in a varaible of type IRMP_DATA. I can use this type as a variable just fine. However, when I try to use it as a method parameter, the IDE complains about:
arduino_irmp_example-mod.ino:23: error: 'IRMP_DATA' was not declared in this scope
IRMPforArduino comes with an example "arduino_irmp_example", which compiles just fine. In this example sketch, IRMP_DATA is used once as a global variable to store received frames.
To show the error, I modified the example sketch. The original version prints the contents of an IR frame to the serial port inside the loop() function. I factored this out into a function printFrame(IRMP_DATA frame) (making the parameter a pointer or a reference doesn't change anything). See the complete modified code here (also attached to this post for your convenience):
/* This is a simple example for using the IRMP library
* original home of IRMP is: http://www.mikrocontroller.net/articles/IRMP
* arduino port of IRMP home: https://gitorious.org/arduino-addons/irmp-arduino
*
* (C) 2012 Stefan Seyfried
* (C) 2014 Falko Thomale
*
* This program is free software. It comes without any warranty, to
* the extent permitted by applicable law. You can redistribute it
* and/or modify it under the terms of the Do What The Fuck You Want
* To Public License, Version 2, as published by Sam Hocevar. See
* http://sam.zoy.org/wtfpl/COPYING for more details.
*/
/* use TimerOne http://arduino.cc/playground/Code/Timer1 for interrupts */
#include <TimerOne.h>
/* first include Arduino.h, the IDE includes it after irmp*.h ... */
#include "Arduino.h"
/* ... and then chokes on uintX_t ... */
extern "C" {
#include <irmp.h>
#include <irsnd.h>
}
/* undefine this if you don't want blinking LED for diagnosis */
#define LED_PIN 4
#define SER_BAUD 9600
/* F_INTERRUPTS is the interrupt frequency defined in irmpconfig.h */
#define US (1000000 / F_INTERRUPTS)
void setup()
{
Serial.begin(SER_BAUD);
/* greeting string and debugging ouput */
Serial.println("IRMP test sketch");
Serial.print("US: ");
Serial.println(US);
#ifdef LED_PIN
pinMode(LED_PIN, OUTPUT);
#endif
//irmp_init();
irsnd_init();
//sei();
led(HIGH);
delay(20); /* make sure the greeting string is out before starting */
led(LOW);
Timer1.initialize(US);
Timer1.attachInterrupt(timerinterrupt);
}
void printFrame(IRMP_DATA frame) {
led(HIGH);
Serial.print("P:");
Serial.print(frame.protocol, HEX);
Serial.print(" A:");
Serial.print(frame.address, HEX);
Serial.print(" C:");
Serial.print(frame.command, HEX);
Serial.print(" ");
Serial.print(frame.flags, HEX);
Serial.println("");
/* Serial.print is asynchronous, so the LED is only flashing very lightly */
led(LOW);
}
IRMP_DATA irmp_data;
int incomingByte = 0; // for incoming serial data
void loop()
{
if (irmp_get_data(&irmp_data))
{
printFrame(irmp_data);
irmp_data.flags = 0; // reset flags!
int result = irsnd_send_data(&irmp_data, TRUE);
if (result != 1)
Serial.println("ERROR");
}
if (Serial.available() == 18 && readAndCheck('P') && readAndCheck(':')) {
// read the protocol
irmp_data.protocol = readHex() * 16 + readHex();
if (readAndCheck(' ') && readAndCheck('A') && readAndCheck(':')) {
// read the address
irmp_data.address = ((readHex() * 16 + readHex()) * 16 + readHex()) * 16 + readHex();
if (readAndCheck(' ') && readAndCheck('C') && readAndCheck(':')) {
// read the address
irmp_data.command = ((readHex() * 16 + readHex()) * 16 + readHex()) * 16 + readHex();
// send ir data
irmp_data.flags = 0;
int result = irsnd_send_data(&irmp_data, TRUE);
if (result)
{
Serial.println("Send IR data: ");
Serial.print("P:");
Serial.print(irmp_data.protocol, HEX);
Serial.print(" A:");
Serial.print(irmp_data.address, HEX);
Serial.print(" C:");
Serial.print(irmp_data.command, HEX);
Serial.println("");
}
}
}
}
}
/* helper function: attachInterrupt wants void(), but irmp_ISR is uint8_t() */
void timerinterrupt()
{
if (! irsnd_ISR()) // call irsnd ISR
{ // if not busy...
irmp_ISR(); // call irmp ISR
}
}
static inline void led(int state)
{
#ifdef LED_PIN
digitalWrite(LED_PIN, state);
#endif
}
static inline int readAndCheck(int c)
{
return c == Serial.read();
}
static inline int readHex()
{
int c = Serial.read();
if (c >= '0' && c <= '9')
{
return c - '0';
}
else if (c >= 'a' && c <= 'f')
{
return c + 10 - 'a';
}
else if (c >= 'A' && c <= 'F')
{
return c + 10 - 'A';
}
return -1;
}
When I hit compile in the Arduino IDE, I get the following error:
Arduino: 1.0.6 (Mac OS X), Board: "Arduino Uno"
/Applications/Arduino.app/Contents/Resources/Java/hardware/tools/avr/bin/avr-g++ -c -g -Os -Wall -fno-exceptions -ffunction-sections -fdata-sections -mmcu=atmega328p -DF_CPU=16000000L -MMD -DUSB_VID=null -DUSB_PID=null -DARDUINO=106 -I/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/cores/arduino -I/Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/variants/standard -I/Users/deltaphi/Documents/Arduino/Sketchbook/libraries/Timer1 -I/Users/deltaphi/Documents/Arduino/Sketchbook/libraries/IRMPforArduino /var/folders/tv/1q4yyzvj7731140vvy2qzhgm0000gn/T/build7877868992204864271.tmp/arduino_irmp_example-mod.cpp -o /var/folders/tv/1q4yyzvj7731140vvy2qzhgm0000gn/T/build7877868992204864271.tmp/arduino_irmp_example-mod.cpp.o
arduino_irmp_example-mod.ino:23: error: variable or field 'printFrame' declared void
arduino_irmp_example-mod.ino:23: error: 'IRMP_DATA' was not declared in this scope
Line 23 is "#include <irsnd.h>" rather than the definition of printFrame().
What gives? Why is the type known in one place but not in another? Have I lost all of my programming knowledge over night or is there a more rational explanation?
Regards,
deltaphi
arduino_irmp_example-mod.ino (3.86 KB)