Comments on: 07. Interrupts

By: jliu83

jliu83 — Wed, 11 Aug 2010 12:08:31 +0000

The answer is on the net. Well, actually on the C30 programming guide.

Search for the C30 Compiler User Guide. Look up the word auto_psv in the guide. It will have a detailed description of how it works. Basically, the ISR vectors tell where to execute the code, but you have to actually place the ISR at the corresponding address space. You can do it automatically with the auto_psv symbol, or you can place the ISRs manually.

-J

By: Dargor

Dargor — Tue, 10 Aug 2010 13:01:01 +0000

Hi,

I have a question (in case you still maintain this site):

//_INT1Interrupt() is the INT1 interrupt service routine (ISR).
void __attribute__((__interrupt__)) _INT1Interrupt(void);
void __attribute__((__interrupt__, auto_psv)) _INT1Interrupt(void)

i know it’s the declaration and definition of the ISR, but what does the parameter “auto_psv” mean?
and: is this apsolutely necessary?

thanks in advance

By: jliu83

jliu83 — Sun, 03 May 2009 20:31:28 +0000

Thanks for the notice! Updated.

-J

By: Tobias

Tobias — Fri, 01 May 2009 11:09:50 +0000

first. Nice Toturial.

Just for nagging rights and for consistensi : in you full program you reset you flag in 2 differents ways. The problem is in the interrupt function where you write :
ISRIFS1bits.INT1IF = 0; insted of
IFS1bits.INT1IF = 0;

-T

By: jliu83

jliu83 — Tue, 20 Jan 2009 02:19:00 +0000

You know to tell you the truth, I don’t have much experience with the simulator. I find it easier and faster to code with an actual circuit. Also, there’s an error on the interrupt code that I just corrected, the IntInit() function was buried in the comments. That function needs to be called first. I’ve made the modifications.

-J