AVR-Chat

----- Original Message ----- 
From: Paul Maddox
To: AVR-Chat@yahoogroups.com
Sent: Thursday, December 23, 2004 1:40 PM
Subject: [AVR-Chat] Stack


Dear all,

  Daft question, I'm trying to setup a couple of IRQs (in assembly) and I'm
getting some odd results, here's the first part of my setup ;-

  LDI  Temp, Low(Ramend)
  OUT  SPL, Temp    ; setup stack pointer

  LDI  Temp, High(Ramend)
  OUT  SPH, Temp

  ; **** setup IRQs

  LDI  Temp, 0b00001010
  OUT  MCUCR,Temp    ; Setup MCUCR for falling edge interupts.

  LDI  Temp, 0b11000000   ; enable ext. INT1 and INT0
  OUT  GICR,Temp    ; by setting General Interupt Control Register

I assume the stack and IRQ setup is ok?
or is it shot to peices?

What is GICR???

You need to set the top two bits in GIMSK, then execute SEI. Make sure you 
have the vectors initialised correctly.

Leon 



-- 
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.298 / Virus Database: 265.6.4 - Release Date: 22/12/2004