Hi Diego,
(Sorry you're receiving this twice. I meant to reply only to sdcc-user list.)
In this situation, I do need
for the variables to be at specific address/bank locations. Like I
said, think of this as having an existing assembly program where you
want to convert parts of it to C.
Another
issue is the sheer number of banksel statements generated by sdcc for a
large memory model. I read some mention somewhere about a way to do a
banksel statement early in the code to avoid that, but I didn't
understand what I read and haven't seen any examples of how it's done.
How is this normally managed in C where code space is too precious to
give away?
I'm sure I'm missing some
fundamental concept of how to adapt C to a PIC environment; possibly
related to the way I created my project. But everything I've tried has
some big problem that makes it nonviable for my
project.
Bob
________________________________
From: Diego Herranz <diegoherr...@diegoherranz.com>
To: Bob Stewart <b...@evoria.net>; sdcc-user <sdcc-user@lists.sourceforge.net>
Sent: Thursday, June 5, 2014 7:51 AM
Subject: Re: [Sdcc-user] Banking 101 for 18F PICs
You can simply use variables (global or local/automatic depending on what you
need) and SDCC+GPUTILS will place them wherever they consider and instructions
for switching banks will be generated automatically when accesing/using those
variables.
So, unless you need variables to be on specific address/bank you don't need to
care about it.
Regards,
Diego
On Thu, Jun 5, 2014 at 4:53 AM, Bob Stewart <b...@evoria.net> wrote:
I've been developing someone else's assembly code in Piklab for 18F2220 for
about a year and I'd like to move at least some of it to C as a learning
experience for another project I want to do. I have variables in the Access
Bank, Bank0, and Bank1. I only access the variables in Bank0 via FSR, so I
don't have to mess with banking for the rest. I cannot figure out how to
duplicate this in C on SDCC. I'm not new to C, just to C with micros. I'm
certainly new to banking in a C environment.
>
>As an example, the following (which are defined in CBLOCKs in the assembly
>code). How do I define them in sdcc, and access them as described above? Do
>I use small or large memory model? I can't even figure out how to begin.
>
>Access ram:
>
TEMP1_H ;13_Temporary 16-bit var available throughout code
execution.
> TEMP1_L ;14_ "
>
>Bank0:
> TIC_CAL_0 ;00_Address of first value beginning with 0x00
> TIC_CAL_1 ;01_Address of first value beginning with 0x01
> TIC_CAL_TABLE:.99
>
>Bank1:
> OLD_CCPR1L ;0_Previous CCPR1L value
>
OLD_CCPR1H ;1_Previous CCPR1H value
>
>
>Bob - AE6RV
>
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