I just got an Elegoo UNO starter kit the other day and have been working my way through the little tutorials on all the parts it came with. I am using VSCode with Platform.io plugin and (after getting it set up) it has been working nicely.
The code I am currently struggling with is a sketch that is supposed to use the IR Remote and Receiver the kit came with, I keep getting the error: collect2.exe: error: ld returned 1 exit status
I have done some looking around online but haven't had much luck getting anything to work.
My full code is below:
char foo;
#include <Arduino.h>
#include <IRremote.h>
#include <IRremoteInt.h>
#include <IR.h>
IRrecv irrecv(RECEIVER); // create instance of 'irrecv'
decode_results results; // create instance of 'decode_results'
void setup() {
Serial.begin(9600);
Serial.println("IR Receiver Button Decode");
irrecv.enableIRIn();
}
void loop()
{
int tmpValue;
if (irrecv.decode(&results)) // have we received an IR signal?
{
for (int i = 0; i < 22; i++)
{
if ((keyValue[i] == results.value) && (i<KEY_NUM))
{
Serial.println(keyBuf[i]);
tmpValue = results.value;
}
else if(REPEAT==i)
{
results.value = tmpValue;
}
}
irrecv.resume(); // receive the next value
}
//The implementation effect of the above program is
//the same as that of the following, but it is more concise
// switch(results.value)
// {
// case 0xFFA25D: Serial.println("POWER"); break;
// case 0xFFE21D: Serial.println("FUNC/STOP"); break;
// case 0xFF629D: Serial.println("VOL+"); break;
// case 0xFF22DD: Serial.println("FAST BACK"); break;
// case 0xFF02FD: Serial.println("PAUSE"); break;
// case 0xFFC23D: Serial.println("FAST FORWARD"); break;
// case 0xFFE01F: Serial.println("DOWN"); break;
// case 0xFFA857: Serial.println("VOL-"); break;
// case 0xFF906F: Serial.println("UP"); break;
// case 0xFF9867: Serial.println("EQ"); break;
// case 0xFFB04F: Serial.println("ST/REPT"); break;
// case 0xFF6897: Serial.println("0"); break;
// case 0xFF30CF: Serial.println("1"); break;
// case 0xFF18E7: Serial.println("2"); break;
// case 0xFF7A85: Serial.println("3"); break;
// case 0xFF10EF: Serial.println("4"); break;
// case 0xFF38C7: Serial.println("5"); break;
// case 0xFF5AA5: Serial.println("6"); break;
// case 0xFF42BD: Serial.println("7"); break;
// case 0xFF4AB5: Serial.println("8"); break;
// case 0xFF52AD: Serial.println("9"); break;
// case 0xFFFFFFFF: Serial.println(" REPEAT");break;
// default:
// Serial.println(" other button ");
}// End Case
This is code that was included with the tutorials, but I am not certain it is airtight as I have already had to do some tweaking of the code and header files included with the device. The error I am getting is the following:
include/IR.h:29:0: warning: "REPEAT" redefined
#define REPEAT 22
^
In file included from src\main.cpp:4:0:
include/IRremote.h:57:0: note: this is the location of the previous definition
#define REPEAT 0xffffffff
^
In file included from src\main.cpp:6:0:
include/IR.h:36:78: warning: initializer-string for array of chars is too long [-fpermissive]
"UP","EQ","ST/REPT","0","1","2","3","4","5","6","7","8","9"};
^
Linking .pio\build\uno\firmware.elf
C:\Users\wiley\AppData\Local\Temp\ccDVm6mB.ltrans0.ltrans.o: In function `global constructors keyed to 65535_0_main.cpp.o.1820':
<artificial>:(.text.startup+0x60): undefined reference to `IRrecv::IRrecv(int)'
C:\Users\wiley\AppData\Local\Temp\ccDVm6mB.ltrans0.ltrans.o: In function `main':
<artificial>:(.text.startup+0x160): undefined reference to `IRrecv::enableIRIn()'
<artificial>:(.text.startup+0x16c): undefined reference to `IRrecv::decode(decode_results*)'
<artificial>:(.text.startup+0x1c6): undefined reference to `IRrecv::resume()'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\uno\firmware.elf] Error 1
I don't understand the errors it is telling me are in the IR.h file. It says that REPEAT is redefined but it only defined once in the file. In regards to the undefined reference to IRrecv:: I dont understand, because I have all the encessary files in the 'Include' folder, and when I CTRL click those functions in the editor it takes me to the files and shows me the code... so why can't it find the code when I run it?
IR.h:
#ifndef _IR_H
#define _IR_H
#define RECEIVER 11
#define KEY_POWER (0xFFA25D)
#define KEY_FUNC_STOP (0xFFE21D)
#define KEY_VOL_ADD (0xFF629D)
#define KEY_FAST_BACK (0xFF22DD)
#define KEY_PAUSE (0xFF02FD)
#define KEY_FAST_FORWARD (0xFFC23D)
#define KEY_DOWN (0xFFE01F)
#define KEY_VOL_DE (0xFFA857)
#define KEY_UP (0xFF906F)
#define KEY_EQ (0xFF9867)
#define KEY_ST_REPT (0xFFB04F)
#define KEY_0 (0xFF6897)
#define KEY_1 (0xFF30CF)
#define KEY_2 (0xFF18E7)
#define KEY_3 (0xFF7A85)
#define KEY_4 (0xFF10EF)
#define KEY_5 (0xFF38C7)
#define KEY_6 (0xFF5AA5)
#define KEY_7 (0xFF42BD)
#define KEY_8 (0xFF4AB5)
#define KEY_9 (0xFF52AD)
#define KEY_REPEAT (0xFFFFFFFF)
#define KEY_NUM 21
#define REPEAT 22
unsigned long keyValue[]={KEY_POWER,KEY_FUNC_STOP,KEY_VOL_ADD,KEY_FAST_BACK,KEY_PAUSE,KEY_FAST_FORWARD,
KEY_DOWN,KEY_VOL_DE,KEY_UP,KEY_EQ,KEY_ST_REPT,KEY_0,KEY_1,KEY_2,KEY_3,KEY_4,KEY_5,
KEY_6,KEY_7,KEY_8,KEY_9,KEY_REPEAT};
char keyBuf[][10]={"POWER","FUNC/STOP","VOL+","FAST BACK","PAUSE","FAST FORWARD","DOWN","VOL-",
"UP","EQ","ST/REPT","0","1","2","3","4","5","6","7","8","9"};
#endif
I have searched online a lot, and this seems to be a common issue with this IR.h library, and none of the fixes proposed have got me anywhere. (I get the same outputs when trying to run this sketch within the Arduino IDE with all a libraries installed)
I have been developing with Java and Python for a while now, but I have almost no experience with C or C++ before the Arduino, so maybe this is a simple error I just don't understand. Super frustrating!! Any help or guidance would be appreciated! Thanks
