AndyG 
Hi
I am porting a project framework from an AtMega 64 to a 644PA.
I am having a certain amount of difficulty getting some of the interrupts to execute properly and I suspect that is because the "SIGNAL" names have changed from processor to processor.
I have always found these names to be entirely non-obvious and I cannot even find definitions of them!
Would any of you kind folk point me at where they have been "hidden"?
Thanks in advance,
Andy G
clawson 
I have always found these names to be entirely non-obvious and I cannot even find definitions of them!
http://www.nongnu.org/avr-libc/u...
(see the very large table in that). The other place to look (and the reason for the non-intuitive names) is that, where possible, AVR-LIbC's *_vect names simply try to duplicate the names given in the table of the device datasheet.
In the copy of the mega644 data I have the interrupts are documented in chapter 9 on page 61. The column in that table labelled "Source" then lists (Reset),"INT0", "INT1", "INT2", "PCINT0", "PCINT1" and so on so I would expect the vectors to be called:
INT0_vect
INT1_vect
INT2_vect
PCINT0_vect
PCINT1_vect
etc.
If I build an empty main() program with a #include
/* Interrupt vectors */ /* Vector 0 is the reset vector */ #define INT0_vect_num 1 #define INT0_vect _VECTOR(1) /* External Interrupt Request 0 */ #define INT1_vect_num 2 #define INT1_vect _VECTOR(2) /* External Interrupt Request 1 */ #define INT2_vect_num 3 #define INT2_vect _VECTOR(3) /* External Interrupt Request 2 */ #define PCINT0_vect_num 4 #define PCINT0_vect _VECTOR(4) /* Pin Change Interrupt Request 0 */ #define PCINT1_vect_num 5 #define PCINT1_vect _VECTOR(5) /* Pin Change Interrupt Request 1 */ #define PCINT2_vect_num 6 #define PCINT2_vect _VECTOR(6) /* Pin Change Interrupt Request 2 */ #define PCINT3_vect_num 7 #define PCINT3_vect _VECTOR(7) /* Pin Change Interrupt Request 3 */ #define WDT_vect_num 8 #define WDT_vect _VECTOR(8) /* Watchdog Time-out Interrupt */ #define TIMER2_COMPA_vect_num 9 #define TIMER2_COMPA_vect _VECTOR(9) /* Timer/Counter2 Compare Match A */
which seems to confirm the vectors are named as per the datasheet interrupt table.
I suspect that is because the "SIGNAL" names have changed
The newer chips do not have the SIG_xxxx defines in their io.h files, only the "new style" xxx_xxxx_vect defines.
AndyG Thanks, guys.
I had thought of checking the user manual. :) It's just that I am too thick to understand it. :(
Cheers
Andy
JohanEkdahl 
It's just that I am too thick to understand it.
Unless you start spinning you will never get thinner.. :wink:
AndyG I shall remember that, Johan. :)
