BasicMicro - Forums

Trap Instruction

Can you do an Oninterrupt or an OnAsmInterrupt for the different Trap interrupt vectors? For example I know that the H8/3694 as well as the H8/3687 both have 4 trap vectors.

Kurt

A quick update, I tried a few different combination of names an this compiles:
oninterrupt TRAP0INT, handle_wkp

I have not tried to use it yet. Trying to decide if I wish to still do a WKPINT in asm to catch which of the 6 legs contact switches makes contact. I started off with an ASM interrupt handler, which figures out which pin was WKPINT pin that was triggered as well as my clock time. With that though I may want to send commands to the SSC-32 so doing this an ASM won't be easy. So this part may be better in Basic. Many options here.
1) Convert the WKPINT interrupt to WKPINT_0-WKPINT_5 interrupts. More overhead here, they will all probably then call a common function with which interrupt happened. This will have more overhead to grab the time, but could compensate by guessing it added 7 push.ls...
2) Leave WKPINT as ASM, save away time and channel and then do a trap which would then jump to the Trap handler which could be in basic. Probably more overhead to do it this way but could be fun.

Kurt

You can but I've never tried it.

You have to send an ASM trap command to initiate one of the TRAP interrupts so I never saw the use of it since you could just run your code instead of forcing the trap to execute. I'm sure these were primarily designed for use as some kind of BIOS interrupt.

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Basic Micro - Robotic Technology Evolved

Yep, also have seen them used in other processors for other exception handling. Like for example if a low level function fails to allocate memory it throws trap x which in it's handler may do something special like GC or maybe someone registered an exception address (like a setjmp), that the handler trims junk off the stack and then sets up to return to a predefined configuration...)

Kurt