----- Original Message -----
From: Timothy Box <Tim@TJBSYSTEMS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, February 21, 2003 8:16 PM
Subject: Re: [PIC] Crownhill Pic Basic Plus?.


> I to looked with interest. But cannot see any high level stuff i2c LCD
> control etc. Is it there?
>
>
> Tim

Hi Tim,

XCSB does not CURRENTLY have any built-in high level I2C LCD support.
HOWEVER adding this functionality is trivial, it does not require a major
overhaul of the compiler. It is possible to take assembler fragments readily
available elsewhere on the net and wrap them in an XCSB user function and
use them as though they were built into the language. I am not suggesting
that the responsibility of providing such functions falls to the end user
BUT that it is trivial compared to producing the underlying compiler and
that I will get around to it as soon as time permits.

In the mean time you should be aware of the underlying simplicity of adding
your own extensions.
To wrap a fragment of assembler in an XCSB user function, it is as simple
as:

        proc byte FRED(byte arg1, byte arg2)

                // assembler fragment to add to bytes and return a result

                asm_start

                        movf    arg1_FRED_func_arg,w
                        addwf    arg2_FRED_func_arg,w
                        movwf    result_FRED_func

                asm_end

        endproc

then you could use the function in any expression

e.g.

        A = FRED(2, K) + 3

Regards
Sergio Masci

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