AVR-Chat

Enabling interrupts from within an ISR, on humble microprocessors, is a very
bad idea. Can't you just process the UART RXC char (store in a buffer) and
quickly dismiss the interrupt - process the newly arrived char later in the
non-ISR code? This is the conventional way to do this. 

Otherwise, if you read the char and store it, then enable interrupts, you'll
be OK >IF< you exit this ISR before another uart interrupt happens. That's
hard to assure, since some other ISR may take the  CPU for some
indeterminate time.

-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of aswinefy2003
Sent: Monday, July 04, 2005 10:14 PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] nested interrupts doubt

I am using iccavr compiler for atmega 32

i want to use nested interrupt
inside  uart rxc isr .How can i implement it
.Should i have to do anything with the stack 
size.Plase suggest some c code.




 
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