compilation issue

[hotelzululima]

following error messages were elicited when I attempted to compile the demo program

Arduino: nightly (Mac OS X), Board: "Arduino Duemilanove or Diecimila, ATmega328"

sketch_may20b.ino: In function 'void sendBit(bool)': sketch_may20b:56: error: 'builtin_avr_delay_cycles' was not declared in this scope sketch_may20b:66: error: 'builtin_avr_delay_cycles' was not declared in this scope sketch_may20b.ino: In function 'void show()': sketch_may20b:126: error: '__builtin_avr_delay_cycles' was not declared in this scope

putting in the following at prior to line 42 fixes same:

ifndef __builtin_avr_delay_cycles

void __builtin_avr_delay_cycles(unsigned long n) { while(n) __n--; }

endif

[hotelzululima]

ps thanx for your research.. its made my use of neopixels a lot less problematic as I am looking for multicopter landing lights and this will work perfect with an old jeenode(duemanilove) v4 I have laying around(actually several).

  hzl

[bigjosh]

I do not think a simple for() loop will compile to exactly the right number of cycles, so you really want to use the built-in function. I wonder why you are not getting that function - it is part of the GCC compiler used by the Arduino IDE and it works on ever machine I have. Are you sure you are using the latest version of the IDE, currently 1.5.6-r2? Have you modified any of the GCC options in the install? Thanks!

[hotelzululima]

just tried a fresh 1.5.6-r2 and eliciting the same error message. hmm no includes in your example? I could use asm nops inline instead to define __builtin_avr_delay_cycles but I want to do this properly :) have not altered the GCC options to my knowledge..

[bigjosh]

No includes needed - Arduino IDE adds necessary includes at the top of every file automatically. The actual definition is in \arduino-1.5.6-r2\hardware\tools\avr\avr\include\avr\builtins.h. You could try adding "#include <\avr\builtins.h>" at top of file just to see if it works, but should not be needed. LMK.

You could manually add a whole bunch of asm("nop") s but you'd need to count carefully and you would loose the ability to easily change any of the #defined delays so not a great solution. If pressed, you could always just add a line to define the function like this...

extern void __builtin_avr_delay_cycles(unsigned long __n);

... but, again, I'd rather figure out why you are seeing this problem than cover it up.

Thanks, josh

[hotelzululima]

tried the include and NO relief???wtf fresh copy of ardiono.app used forward instead of reverse slashes(this is osx) but still having this issue hmm got fooled went from :+1: neopixel_driver_ino.ino: In function 'void sendBit(bool)': neopixel_driver_ino.ino:58: error: 'builtin_avr_delay_cycles' was not declared in this scope neopixel_driver_ino.ino:68: error: '__builtin_avr_delay_cycles' was not declared in this scope neopixel_driver_ino.ino: In function 'void show()': neopixel_driver_ino.ino:128: error: 'builtin_avr_delay_cycles' was not declared in this scope

TO: /var/folders/1y/9dx7kgy536dbp_v17n14rs3c0000gn/T/build5978779052290926128.tmp/neopixel_driver_ino.cpp.o: In function show()': /Applications/neopixel_driver_ino.ino:128: undefined reference tobuiltin_avr_delay_cycles' /var/folders/1y/9dx7kgy536dbp_v17n14rs3c0000gn/T/build5978779052290926128.tmp/neopixel_driver_ino.cpp.o: In function sendBit(bool)': /Applications/neopixel_driver_ino.ino:58: undefined reference tobuiltin_avr_delay_cycles' /Applications/neopixel_driver_ino.ino:68: undefined reference to __builtin_avr_delay_cycles' /Applications/neopixel_driver_ino.ino:74: undefined reference to__builtin_avr_delay_cycles'

once: extern void __builtin_avr_delay_cycles(unsigned long __n); defined...(from builtins.h definition for same)

[bigjosh]

Hmm... Somehow Arduino on IDE might be using a different GNU compiler version? I will try to find a mac to test on. Thanks.

[hotelzululima]

the neopixel lib from adafruit does compile up correctly so using that for now...as only 144 leds involved well within 168 range for the app

[bigjosh]

I just updated the code so it now compiles and works correctly under OSX with the Arduino 1.6.1 IDE. I should also work with any past or future version since I am no longer using the problematic _delay_cycles() function.