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External Interrup Rb0

 
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Frnc_Ad



Joined: 14 Jun 2005
Posts: 1
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External Interrup Rb0
PostPosted: Tue Jun 14, 2005 6:58 am     Reply with quote
As I can read the time of the rb0 pin receiving sianis from codigo of bars for this pin.
valemike
Guest
PostPosted: Tue Jun 14, 2005 7:14 am     Reply with quote
If i think i know what you are asking, you want to know the time that an rB0 interrupt occurred.

I am not aware of any "timestamping" for the rb0 interrupt. YOu can however use the CCP module, using a capture pin, e.g. CCP1.

You can implement a timestamp in software though. That is, you must save the value of a running timer (e.g. Timer1) in a RAM variable. Be aware though that this is not as precise as a capture interrupt, since you will have interrupt latency delaying the execution of your ISR. But this does give a coarse timestamp, and may be consistent enough since you'll always have a consistent interrupt latency. (Unless of course, if you have multiple pending interrupt service routines, then your latency can get increased; that's why i say it is 'coarse').
Guest
Re: External Interrup Rb0
PostPosted: Thu Jun 16, 2005 5:33 pm     Reply with quote
Frnc_Ad wrote:
As I can read the time of the rb0 pin receiving sianis from codigo of bars for this pin.


In the first part, (L_TO_H )when I dumb of 0 for 1 the value in pin rb0 I count the time that was in 1 and configure for descending edge (H_TO_L).
My problem is inside of interrupt, as to make with that software understands that it must make the second part of the interruption
In the second part the routine must keep the value in zero.



Interrupt routine.
#int_ext
void int_ext_isr(void)
{
int x,i;
static boolean led;

if (intedg==1)
{
intf = 0;
//test interrupt
led = !led;
output_bit (pin_c4,led);

if(var1 == 6)
{
var1 = 0;
}
var1 = var1 + 1;
x=get_rtcc();
valor1[var1];
//write mem. RAM o val. "x" na pos "valor1" do bank 0
write_bank(0 ,valor1,x);
set_timer0(0);
ext_int_edge(0,H_TO_L);
}
else
{
intf = 0;
if(var1 == 6)
{
var1 = 0;
}
var1 = var1 + 1;
x=get_rtcc();
valor0[var1];
write_bank(0 ,valor0,x);
set_timer0(0);
ext_int_edge(0,L_TO_H); .
}


}
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