problem compiling code trying to add sscanf function

[Stephane Carrez]

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Hi!

n f wrote:
> I'm programming a 68hc11e1 microprocessor, using c.
> Does anyone know if it's possible to use stdio
> functions from c, to program a 68hc11e1. Everytime I
> compile it gives me an error when I try to use sscanf
> function. I'm trying to convert a string to float. I
> have inserted "#include <stdio.h>", but it still does
> not work.

You don't tell us which error you are getting.

You must at least add the following libraries: -lc -lbcc -lc
and use the newlib 1.11 to use sscanf().

Note that even if floating points work well with 68hc11/68hc12
the libraries are so huge that it's quite unusable in a real situation.
Stay away from using floating point when using a such embedded system.

The 'sscanf' and 'printf' with floating point support are also so
huge (in newlib) that it will use 75% of the 64K address space.
(it will not fit in your 24K text region).

   Stephane

> 
> here are my files:
> Here's my memory.x file:
> 
> OUTPUT_FORMAT("elf32-m68hc11", "elf32-m68hc11",
> "elf32-m68hc11")
> OUTPUT_ARCH(m68hc11)
> ENTRY(_start)
> SEARCH_DIR(C:\usr\lib\gcc-lib\m6811-elf\3.3.1-m68hc1x-20031004
> \mshort)
> 
> MEMORY
> {
> ioports (!x) : org = 0x1000, l = 0x500
> eeprom (!i) : org = 0xB600, l = 0x300
> data (rwx) : org = 0x8800, l = 0x1000
> text (rx) : org = 0x9000, l = 0x6000
> }
> 
> PROVIDE (_stack = 0x01ff-1);
> 
> -------------------------------------------------------------
> here's my project.mak file:
> 
> OC = c:/usr/bin/m6811-elf-objcopy
> CC = c:/usr/bin/m6811-elf-gcc
> RM = C:/embeddedGNU/rm.exe
> 
> CFLAGS = -m68hc11 -O3 -fno-ident -fno-common
> -fomit-frame-pointer -
> mshort -fsigned-char
> LDFLAGS = -Wl,-u,-mm68hc11elfb
> OCFLAGS = -O srec
> 
> CSRCS=main.c
> 
> OBJS=$(CSRCS:.c=.o)
> 
> all: ourProject.elf ourProject.s19
> 
> $(OBJS): %.o: %.c
> $(CC) $(CFLAGS) -c $<
> 
> ourProject.elf: $(OBJS)
> $(CC) $(CFLAGS) $(LDFLAGS) -o ourProject.elf $(OBJS)
> 
> ourProject.s19: ourProject.elf
> $(OC) $(OCFLAGS) ourProject.elf ourProject.s19
> 
> clean:
> $(RM) -f ourProject.elf
> $(RM) -f ourProject.s19
> $(RM) -f ourProject.dmp
> $(RM) -f $(OBJS)
> 
> 
> ---------------------------------------
> basically this is what i'm adding:
> 
> #include<stdio.h>
> 
> UINT x;
> char *out = "1234.4213"; // this is what what the data
> 
>                          //looks like
> float fnum;
> x = sscanf(out, "%lf", &fnum);
> 
> 
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