DT ASM Interrupts

[tumbleweed]

That's correct.

ReEnterPBP is used to save/restore the state of PBP, which you don't need to do if you're using asm and not using PBP statements in the ISR handler.

[MOUNTAIN747]

Thanks tumbleweed, now I can put a statement in TYPES of interrupts that states "When using ASM interrupts only, the INCLUDE ReEnterPBP.bas file is not needed."

[mpgmike]

Some PICs have automatic context saving while others do not. Might want to mention that. It's listed in the appropriate data sheets.

[richard]

its also worth noting that if you only have 1 interrupt and that it is a asm type then
DEFINE INTHAND
is quicker and leaner than dt-ints ,and just as easy to accomplish especially if chip has auto context save

[MOUNTAIN747]

Thanks guy for your comments.
Richard, so for those of us who don't know about DEFINE INTHAND, Please give a bref explanation. I see that DEFINE INTHAND followed by INT_ENTRY is at the beginning of DT_INT-14.bas. It is not mentioned again in the code. INT_ENTRY saves everything and more. So I ask, how do you set up for a single ASM interrupt with INTHAND?

[richard]

if you look at this thread you can see how I used the same isr with and without dt_ints
http://www.picbasic.co.uk/forum/showthread.php?t=23874

I see that DEFINE INTHAND followed by INT_ENTRY is at the beginning of DT_INT-14.bas

INT_ENTRY is the name of dt_ints "master" isr your isr{'s} are then called from that

So I ask, how do you set up for a single ASM interrupt with INTHAND?

there is an entire section of the pbp manual dedicated to this subject , its clearly written , concise and
covers the subject thoroughly . I would have nothing to add that is not covered therein handsomely