interrupt timer???

[reik6149]

hi all, i am a newbie for picbasic, have a question regarding to my final year project, hope the pros can help me =)

the question is : is it posible to run 2 routine at the same time ?

basically i want a routine to measure the time between my sensor interrupt, and another routine running a series of LED, the process are as below:


interupt : sensor pass thru <--- when sensor pass thru then interrupt jump to here
off all led
timer1 stop and save the value
timer1 start count the time between the sensor pass thru

led1 on
pause 1000
led2 on
pause 1000
led3 on
pause 1000
led4 on
pause 1000

from the process above, the timer1 is counting the value, and the leds is still on at the same time.

is the process above posible? can anyone give me the clue or code related? =)

thank you very much =)

[ScaleRobotics]

Welcome to the forum reik6149. You can run multiple interrupts at the same time, making it appear as the chip is doing multiple things at once.

The easiest way to get started in interrupts, is to use DT_INTS or instant interrupts. This is an include file that simplifies the use of interrupts. It can be found here: http://darreltaylor.com/DT_INTS-14/intro.html
You will notice a hello world, a blinky, and an elapsed timer. And also a combine all three. This is similar to what you are doing. Get comfortable setting all three of these, then see if you can figure out what you want your project to do.

[reik6149]

thx for scalerobotics's kindly reply =)

by the way,after i read thru the website,i still cant get the point. Perhaps i do not have the basic knowledge about something like option_reg or t1con. i think i have to read the basic 1st.
=(

[mackrackit]

ASM interrupts are good, Darrel's instantaneous ones are best...

But for starters look at ON INTERRUPT in the PBP manual and INTCON in the chips data sheet.

BTW, what chip are you playing with?

[reik6149]

sorry guys, im really cant understand what darrel did, from this page http://darreltaylor.com/DT_INTS-14/elapsed.html

how the program know when start button is interrupted??

in wat condition the program will

gosub starttime and gosub resettime??

[Acetronics2]

Hi, reik

Your scenario reminds me a "Thunderstrike distance measurer" ... ( sorry for the Tool name ... I am French ... )

so, if I understand it right ... the time between two interrupts could be many seconds ... ( 4 in your example ).

Consider a Pic Timer itself ( Timer1 ...i.e.) can count up to 0.52s @ 4Mhz clock ... so, you have to use an extra counter that will count Timer 1 Overflows.

your time will be ( 0.52s x nb of overflows ) + ( Timer1 x 8µs )
distance will be ... 330 ( or SQR ( 1.3*287*(Temp+273.15)) ... x count (s)

see Here for Timer calculations help :
http://pictimer.picbingo.com/index.php

BUT, you first have to open your pic datasheet to learn about the Timer modules and CCP module ( capture mode ) use.

Darrel's Interrupts just are the easy tool to drive the interrupts ... but it is you to configure what happens during the interrupts ...

The process is the same for pulse duration measuring, Rpm meters, shotshells speed measuring ...

Just need to know the maximum time between interrupts ...

Alain