I have been having the same compiling error while working with my Arduino Uno. I have checked the code 6 times and cannot find anything wrong with it but whenever I attempt to compile it I receive this error:
core.a(main.cpp.o): In function main': C:\Program Files (x86)\Arduino\hardware\arduino\cores\arduino/main.cpp:14: undefined reference to loop'
And this error message comes up on anything, even a code as simple as:
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
I need help as I do not fully understand what it is saying. Thank you in advance!
Post your code.
Use code tags.
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Of course that code wouldn't compile, where is your:
void setup(){
}
void loop(){
}
As expected by the IDE.
As the example sketch, BareMinimum, shown below, you must have a setup() and loop() function in your sketch, even if you don't put anything in them as shown here:
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
Okay I was trying to simplify the code as much as possible so that I didn't get that error message and figured it would compile even without the "void setup" part. Anyways I have the starter kit and I have copied the code exactly out of the book and I am still getting the same error code
Here is my code(I apologize, I am not sure how to use the "code tags")
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const int sensorPin = A0;
int switchState = 0;
int prevSwitchStae = 0;
int reply;
void setup() {
lcd.begin(16,2);
pinMode (sensorPin,INPUT);
lcd.print("ask the");
lcd.setCursor(0,1);
lcd.print("Crstal Ball!");
}
and then after attempting to compile that code it gives me this error message :
core.a(main.cpp.o): In function main': C:\Program Files (x86)\Arduino\hardware\arduino\cores\arduino/main.cpp:14: undefined reference to loop'
Yup, it looks like there's no loop() there.
Yea I realize that but what part of my code is trying to reference the loop?
Yea I realize that but what part of my code is trying to reference the loop?
Your are in a
void arguing_loop_with_the_compiler(){
if(you want to argue = true) keep arguing,
else{ you put a
void loop() {
// put your main code here, to run repeatedly:
}
and it will work
}
}
Valikir018:
Yea I realize that but what part of my code is trying to reference the loop?
It's the the part you can't see. The Aduino IDE 'wraps' your sketch around a supplied main() function to your sketch that includes an init() function to set up timer0 to kick off the hardware timer0 and defines a setup() and loop() function prototypes, so you are obligated to supply a setup() and loop() function.
Of course,
if(you want to argue = true) keep arguing,
should be
if(you want to argue == true) keep arguing;
Yeah your right. 
that is why he was continuously arguing. 
I'll fix that on the spot
The IDE adds:
void main(void) {
sei();
init();
setup();
for(;;){
loop();
}
}
Or something like that.
If you don't want loop() or setup(), just use this in your code instead:
void main(void) {
sei();
init();
//Your code here
exit();
}