[sdcc-devel] [ sdcc-Bugs-1544205 ] how do i create a PORTD typedef?

[SourceForge.net <no...@so...>]

Bugs item #1544205, was opened at 2006-08-21 20:42
Message generated for change (Comment added) made by carterson3
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1544205&group_id=599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: pic14 target
Group: non bugs
Status: Closed
Resolution: Invalid
Priority: 5
Submitted By: carterson3 (carterson3)
Assigned to: Nobody/Anonymous (nobody)
Summary: how do i create a PORTD typedef?

Initial Comment:

#include <pic16f877a.h>

// ----- PORTD bits --------------------
typedef union {
  struct {
    unsigned char :1;
    unsigned char :1;
    unsigned char :1;
    unsigned char :1;
    unsigned char LED0:1;
    unsigned char :1;
    unsigned char :1;
    unsigned char :1;
  };
} __PORTD_bits_t;
extern volatile __PORTD_bits_t __at(PORTD_ADDR) 
PORTD_bits;

#define LED0               PORTD_bits.LED0

void main()
{
    	TRISD = 0;
	LED0  = 1;	//this line doesnt work...

    	while(1) {};
}

sdcc: 
mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/
ds400/hc08 2.6.1 #4339 (Aug 18 2006) (MINGW32)

C:\SDCC>sdcc -mpic14 -p16f877a main.c
message: using default linker 
script "C:\sdcc\gputils\lkr\16f877a.lkr"
error: missing definition for symbol "_PORTD_bits", 
required by "main.o"

I am trying to get SDCC to work on SBC44B from 
modtronix. I got it to work a little, but dont really 
have a clue how to get a PORTD typedef to work...

Thanks so much for looking. I appreciate it.
-e...@re... (jim pruett)



----------------------------------------------------------------------

>Comment By: carterson3 (carterson3)
Date: 2006-08-22 14:02

Message:
Logged In: YES 
user_id=1325633

I replaced:
extern volatile __PORTD_bits_t __at(PORTD_ADDR) PORTD_bits;
with
       volatile __PORTD_bits_t __at(PORTD_ADDR) PORTD_bits;
and now it says:
c:\sdcc> sdcc -mpic14 -p16f877a main.c
message: using default linker 
script "C:\sdcc\gputils\lkr\16f877a.lkr
error: multiple sections using address 0x8

-thanks tecodev, for continued help, carterson2


----------------------------------------------------------------------

Comment By: Raphael Neider (tecodev)
Date: 2006-08-22 12:07

Message:
Logged In: YES 
user_id=1115835

If PORTD is not declared in pic16f877a.h (and thus
PORTD_bits defined in device/lib/pic/libdev/pic16f877a.c),
you need not only declare PORT_bits (using "extern foo;")
but also define it (leave out the extern keyword).
Extern tells SDCC that the symbol PORTD_bits is defined in a
different .o file and resolved by the linker. You want to
tell SDCC that PORTD_bits resides at PORTD_ADDR and is
(probably) not defined elsewhere. This is not SDCC specific,
but a common C construct...

To cut it short: delete extern, recompile, be happy.

Regards,
Raphael

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1544205&group_id=599