slviajero
commented
2 years ago Transparent interrupt handling from BASIC is on my list for version 1.4. I will complete 1.3. and release it in a while and then start to work on this. It is not really easy to implement this. I have a concept for it but I am unsure which language features to use.
The way it needs to be done is to build an interrupt handler just like the function you show.
Then one has to catch the interrupt condition in the statement() loop and branch there to a new line. This way an interrupt could trigger a GOTO or GOSUB. Problem is that one has to handle infinite loops. If the interrupt comes frequently, the interpreter doesn’t have to to process the code. One would need an interrupt mask function in addition to the mechanism above.
If you want something very specific / quick and dirty, you could just add an interrupt handler and then deposite a value to a variable. Ideally a static variable A-Z. This is done through setvar(). The BASIC code could then poll state changes of this variable. Cleaner would be a new C variable and a function to access it.
Am 18.07.2022 um 22:53 schrieb Encom Lab @.***>:
On the SBC I use I have a button to pin 10 and this in setup:
//interrupt pin pinMode(interruptPin, INPUT); enableInterrupt(interruptPin, interruptFunction, FALLING); that calls this function:
void interruptFunction() { current_line = 0; sp = program + sizeof(program); printmsg(okmsg); } Obviously this is for the BASIC interpreter I've been using - is there a way to implement something like this in your interpreter? When called it functions like a "break" and leaves the resident program and variable assignments intact.
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EncomLab
This is the platform I am using - no keyboard or serial while operating hence the crash to break;)
On the SBC I use I have a button to pin 10 and this in setup:
that calls this function:
Obviously this is for the BASIC interpreter I've been using - is there a way to implement something like this in your interpreter? When called it functions like a "break" and leaves the resident program and variable assignments intact.