DT-ints-18, How to ...

[iw2fvo]

Good Day to all of you in the forum,

I will like to have some direction on how to generate an interrupt ( used to call up a subroutine ) every 10 ms.
I will like to know how to set_up the system to get interrupts at a desired period
I am using PICbasic pro 2.50 and DT-ints-18. Pic is 18f4523 running at 40 MHz.
Thanks in advance for any help.
Ambrogio

[HenrikOlsson]

Hi,
Have you looked at the examples provided by Darrel on his site where you downloaded the DT-Ints files?
May I suggest you use this one as a starting point. The example lets TMR1 free-run so the interrupt triggers at a given frequency (each time TMR1 overflows).

To change the frequency you reload the timer with a specific value each interrupt, so that it starts from a value other than zero.

See if you can get that example to work as is for starters.

/Henrik.

[Acetronics2]

Hi,

Steve Monfette ... aka DJ KeeWee ... aka Mr E ...
published here ( 2004 ) a phase control dimmer project where everything was shown ...

don't remember if using DT Interrupts ... but working !!!

the code ...
http://www.picbasic.ru/_fr/3/LampDim.bas

Alain

[iw2fvo]

Thanks Heirik and Acetronics2.
I will go on with your indications.
My antivirus does not allow to me to open the following :
http://www.picbasic.ru/_fr/3/LampDim.bas
Any possibility to have the files posted to me ?
Thanks,
Ambrogio
[email protected]

[mackrackit]

Right click and save as ?

[iw2fvo]

The problem is that my antivirus does not allow me to enter that link.
Thanks
Ambrogio

[iw2fvo]

I have loaded the program as indicated .
No errors displayed.
I am using pbp 2.50, picf184523 @ 40 MHz speed.
I have a square wave output at porta.4 and 100 msec period ( 50 msec high and 50 msec low ).
Where does the 100 msec come from ?
How could I set different periods ?
The program is attached here.
Thanks
Ambrogio

'HSPLL OSCILLATOR HAS BEEN DEFINED IN THE PBP FOLDER > 18F4523 FILE

DEFINE OSC 40
LED1 VAR PORTA.4
INCLUDE "DT_INTS-18.bas" ' Base Interrupt System
INCLUDE "ReEnterPBP-18.bas" ' Include if using PBP interrupts

ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
INT_Handler TMR1_INT, _ToggleLED1, PBP, yes
endm
INT_CREATE ; Creates the interrupt processor
ENDASM

T1CON = $31 ; Prescaler = 8, TMR1ON
@ INT_ENABLE TMR1_INT ; enable Timer 1 interrupts

Main:
PAUSE 1
GOTO Main

'---[TMR1 - interrupt handler]--------------------------------------------------
ToggleLED1:
TOGGLE LED1
@ INT_RETURN