On 2 Aug 2010, at 06:36 , vasile surducan wrote:
hi Eur,
Why did you stop on all yours/Roman Black bresenham libraries to
generate 1 second?
Because that is what I need.
If you generate 1milisecond (or less) instead, you have a real time
library process usefull for something else than clock, then maybe
the question of how long the ISR can be, may be actual.
I might be able to do that. But do tell me what you want.
Should I make a millisecond word that counts to 1000?
Should I keep the second, or will you or others check every second
and update the clock?
I'm not too fond of doing calendar stuff in an isr. IMHO an ISR
should not be < 100 asm instructions, preferably < 20.
My old rtc_isr_tmr0 was 19 instructions, the new one is 69. This is
not an improvement, I think.
Concerning the length: a millisecond counter, with a 100-instruction
ISR spends 10% of the time in the ISR, if running on 4 MHz.
Vasile
On Sat, Jul 31, 2010 at 3:13 PM, <[email protected]> wrote:
Revision: 2170
Author: eur.van.andel
Date: Sat Jul 31 15:12:29 2010
Log: made a new all-jal, 5 line RTC ISR with TMR3, needs 50 lines
comment
http://code.google.com/p/jallib/source/detail?r=2170
Added:
/trunk/include/jal/rtc_isr_tmr3.jal
Modified:
/trunk/include/jal/rtc_isr_tmr0.jal
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