PIC Basic pro

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ScadaEng 16 years ago

I have not done much programing in PBP, I mostly have used assembly. I'm trying to knock out a quick program, but one detail is hanging me up. I'm reading a 24C512 EEPROM 8 bytes at a time. I created a word (16bit) variable to hold the memory address.

Problem is when I reach $19F8 the next address should be $0A00, but I get $0000! The low byte works right, then I get to $1B00 and everthing is good until I get to $29F8 and the next address is again $0000! The $0000 addresses are not really $0000, I know this from the data. Every time the high byte reaches $0A it displays $00! I wrote a simple routine to just count from $0000 to $FFF8. It reacts the same! I have PBP ver 2.30, is this a problem with PBP?

My code...

temp: memadd = $0000 Hserout [b1, b0 ] GOTO again again: memadd = memadd + $0008 if memadd = $FFF8 THEN GOTO start ELSE Hserout [b1, b0] ENDIF GOTO again

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David Eather 16 years ago

Isn't there something in the PBP manual about a 2k program space and overcoming that limitation?

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Don McKenzie 16 years ago

There is a whole forum dedicated to answering such questions. I strongly suggest you try there:

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Cheers Don...

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Martin Riddle 16 years ago

Compiler bug? Try making $0008 a constant and add the constant.

Cheers

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Al Borowski 16 years ago

Hi ScadaEng,

I've actually used this chip and Picbasic in a datalogging application. If you can't solve your problem, please let me know and I'll see if I can help.

I just wanted to say: You're moving away from assembly (almost certainly a good decision) to... Picbasic Pro? If you're going to write non-trivial programs, are you sure this is a wise choice?

Before you invest too much effort, please consider:

1) Picbasic doesn't really support modular programming. All variables are global - this really, really sucks. Either you will end up with variables called temp1, temp2, temp5 etc, or at some point you'll cause yourself massive headaches when you accidently reuse a temp variable.

2) Picbasic doesn't support interrupts - the fake interrupts included with PBP don't count. You always have to write your ISR in assembly.

3) Picbasic doesn't properly support strings. Or floating point. Or signed 8 or 16 bit quantities. Or unsigned 32 bit variables.

Point 1) is a big enough issue to look for another compiler IMHO. If you have to stick to PBP, one solution is to write a software stack, to save and preserve certain variables in functions - however you have to be very careful to match every Push with a Pop.

Cheers,

Al

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ScadaEng 16 years ago

I've actually used this chip and Picbasic in a datalogging application. If you can't solve your problem, please let me know and I'll see if I can help.

I just wanted to say: You're moving away from assembly (almost certainly a good decision) to... Picbasic Pro?

I agree with your evalulation of PBP. I never used it before this project, and expect I won't bother with it again. A team member bought it, he did not want to learn assembly, or any other language for programing PIC.

Thanks to all who responded!

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