Em 24/8/2010 10:39, Carl Denk escreveu:
> I am in need of 2.5 serial ports on the 18F1320, (1) RS-232, (1) RS485,=20
> and (1) Serial LCD, Tx only). The RS-232 would be the hardware USART,=20
> and the others would be Software Uart's. I understand the part of=20
> modifying the specific Library files, and rebuilding after  revising the=
=20
> PORT numbers. Here's the approach I'm thinking:
> 1: Copy 2 sets of the library sw_uart  files to the project directory.
> 2: Rename one of the sets of files, say append "_2".
> 3: On the first set of files change the ports, function, and file=20
> references to match the first UART.
> 4:  On the 2nd set of files do the same.
> 5: Rebuild both sets of  library  files.
> 6: There will be 2 sets of function calls with different names
>
> A couple of questions:
> 1: Is there a way to economize on code size? I'm thinking that could add=
=20
> an arguement to the functions where need be to specify which software=20
> ports we are pointing.

It is a good idea, not only to save code (perhaps not that much savings
anyway), but to have a more homogeneous and flexible approach.

I posted some code in the thread "[PIC] C18 function prototypes
(pic18f8627)", related to SPI, but the idea is the same.


> 2: I haven't looked in detail, but, I'm assuming not all of the=20
> sw_uart's files are port dependent, and will have no changes. Since they=
=20
> are small and storage in project directory isn't an issue, is there a=20
> reason to rebuild them, or will they just come along for the ride?

By keeping the files in the project tree, you don't need to rebuild the
library, but if you stop using some of them, you must remember to remove
them from the source files list or else they will still be linked and
wasting program memory.
If you build a library, then the linker ignores the functions that are
not called.

You don't need to rebuild the compiler's library, you could create a
smaller library with just your new functions and add this library to the
project. If the functions in your library have the same name as some in
the original library, then your library must be listed before the
original one in the project.


It is only worth the hassle of rebuilding the library if you plan to use
these functions on several projects. If they are intended for one
project only, then add the files directly to the project or create a
smaller library.

I at first keep the files added directly to the project. If I feel that
the files may be useful for other projects, and after they are very
stable, tested and bug-free, then I move them to a library.

> Thanks for comments. :)

Best regards,

Isaac


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