Location of library routines?

[Andy Drummond]

I have written a boot-loader for my PIC18F252 but I need to force the I2C library routines into the boot area - as it is they get located right in the middle of the area I want to load. Is there any way of forcing the location of these routines?
___________________________
This message was ported from CCS's old forum
Original Post ID: 14261

[PCM programmer]

:=I have written a boot-loader for my PIC18F252 but I need to force the I2C library routines into the boot area - as it is they get located right in the middle of the area I want to load. Is there any way of forcing the location of these routines?
--------------------------------------------------------------

CCS has a small comment in the README.TXT file regarding
the "#org default" command. I made a test program below,
which appears to work. I was able to relocate the internal
i2c library to ROM address 0x800. But, it wouldn't relocate
until I moved the "#use i2c" statement so it was within main().
Normally, I put it above main(), but then the compiler just
kept putting the i2c code in low ROM.

To test that the "#org default" can be turned off, I have
added another function, my_func(), at the end of the program.
It's placed right after the "#org default" statement which is
below the closing brace of main(). my_func() was placed
in low ROM by the compiler, so it works OK.

The README.TXT file, if you want to read it, is in this folder:
c:\Program Files\Picc\
It refers to an example file, LOADER.C, which is in:
c:\Program Files\Picc\Drivers

I tested this with PCM vs. 3.148.

<PRE>
#include "c:\Program Files\Picc\Devices\16F877.H"
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 8000000)
//#use rs232(baud = 9600, xmit=PIN_C6, rcv = PIN_C7, ERRORS)
<BR>
<BR>
my_func(void);
<BR>
#ORG 0x0800, 0x0FFF AUTO=0 DEFAULT
<BR>
//=====================================
void main()
{
#use i2c(Master, SDA=PIN_C4, SCL=PIN_C3)
<BR>
i2c_write(0x55);
<BR>
my_func();
<BR>
while(1);
}
//===============================
<BR>
#org default
<BR>
<BR>
my_func(void)
{
char c;
c = 0x55;
}
</PRE>
___________________________
This message was ported from CCS's old forum
Original Post ID: 14270

[Andy Drummond]

Thanks PCM, you got me going in the right direction.
I couldn't make it work as you showed, but I #ORG'ed the whole
program from 100-77FF, the loader from 7800-7C00, and the compiler then put the I2C routines (etc) after 7C00 as there was
no space apart from that. All well, thank you.



:=:=I have written a boot-loader for my PIC18F252 but I need to force the I2C library routines into the boot area - as it is they get located right in the middle of the area I want to load. Is there any way of forcing the location of these routines?
:=--------------------------------------------------------------
:=
:=CCS has a small comment in the README.TXT file regarding
:=the "#org default" command. I made a test program below,
:=which appears to work. I was able to relocate the internal
:=i2c library to ROM address 0x800. But, it wouldn't relocate
:=until I moved the "#use i2c" statement so it was within main().
:=Normally, I put it above main(), but then the compiler just
:=kept putting the i2c code in low ROM.
:=
:=To test that the "#org default" can be turned off, I have
:=added another function, my_func(), at the end of the program.
:=It's placed right after the "#org default" statement which is
:=below the closing brace of main(). my_func() was placed
:=in low ROM by the compiler, so it works OK.
:=
:=The README.TXT file, if you want to read it, is in this folder:
:=c:\Program Files\Picc\
:=It refers to an example file, LOADER.C, which is in:
:=c:\Program Files\Picc\Drivers
:=
:=I tested this with PCM vs. 3.148.
:=
:=<PRE>
:=#include "c:\Program Files\Picc\Devices\16F877.H"
:=#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
:=#use delay(clock = 8000000)
:=//#use rs232(baud = 9600, xmit=PIN_C6, rcv = PIN_C7, ERRORS)
:=<BR>
:=<BR>
:=my_func(void);
:=<BR>
:=#ORG 0x0800, 0x0FFF AUTO=0 DEFAULT
:=<BR>
:=//=====================================
:=void main()
:={
:=#use i2c(Master, SDA=PIN_C4, SCL=PIN_C3)
:=<BR>
:=i2c_write(0x55);
:=<BR>
:=my_func();
:=<BR>
:=while(1);
:=}
:=//===============================
:=<BR>
:=#org default
:=<BR>
:=<BR>
:=my_func(void)
:={
:=char c;
:=c = 0x55;
:=}
:=</PRE>
___________________________
This message was ported from CCS's old forum
Original Post ID: 14286