I'm currently trying to use SDCC to generate an Intel Hex file for a PIC16
device (pic18f452). I'm using a Makefile and multiple source files, to be
compiled separately and linked at the end. This is my Makefile setup:
CFLAGS=--std-c99 --use-non-free -mpic16
LDFLAGS=--out-fmt-ihx
build/image.hex: build/main.rel build/lcd.rel
sdcc -o build/image.hex $^
build/main.rel: main.c lcd.h
sdcc $(CFLAGS) -c $< -o $@
build/lcd.rel: lcd.c lcd.h
sdcc $(CFLAGS) -c $< -o $@
The source files are as simple as it gets:
*lcd.h:*
#ifndef _LCD_H_
#define _LCD_H_
void lcd_init(void);
#endif
*lcd.c:*
#include <pic16/pic18f452.h>
#include "lcd.h"
void lcd_init(void) {
PORTEbits.RE1 = 0;
PORTEbits.RE2 = 0;
}
*main.c:*
#include <pic16/pic18f452.h>
#include "lcd.h"
void main() {
lcd_init();
while (1);
}
Running make gives me the following (warnings?) errors, from the linking
stage:
ASlink-Warning-No definition of area HOME
ASlink-Warning-No definition of area XSEG
ASlink-Warning-No definition of area PSEG
And I don't get my output. If I concatenate all my code into one file
and run sdcc on it, however, it works:
$ cat lcd.h lcd.c main.c > *monster.c*
$ sdcc --use-non-free -mpic16 monster.c
message: Using default linker script "/usr/share/gputils/lkr/18f452_g.lkr".
$ ls
lcd.c lcd.h main.c Makefile monster.asm monster.c monster.cod
*monster.hex* monster.lst monster.o
Is there some other setup I should be doing, or flag I should be passing?
I'm not really using any ASM code or defining my own areas, and expected it
to work out-of-the-box with C. Are my assumptions wrong?
Sorry for the long message, hope to hear soon
Thanks in advance,
Délisson J. G. Silva
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