[Sdcc-user] PIC14 itoa, sprintf functions

[Steve Brown]

Hi all,

I'm still getting to grips with the PIC14 port of SDCC, so forgive me if
the answer are obvious; they aren't to me ;-)

Needing an itoa or similar function to convert from an int (or whatever)
to a string, I went to code the obvious function using sprintf, but
that function isn't available.

Can somebody suggest how I might implement such a function?

-S

[Julian Guarin]

int value=-531;
int sign;
char buffer[10];
int index=0;
int auxiliar;
if (value<0)
sign=1;
if (sign){
buffer[index]='-';
printf ("%c\n",buffer[index]);
index++;
value=value*-1;
}

do{
aux=value;
while (value>=10)
value/=10;
buffer[index]=value;

/* Not necessary */
printf("%c\n",buffer[index]);

index++;
value=aux%10;

}while(aux>10);
printf("%s\n",buffer);


The output is:
-
5
3
1
-531

Post by Steve Brown
Hi all,
I'm still getting to grips with the PIC14 port of
SDCC, so forgive me if
the answer are obvious; they aren't to me ;-)
Needing an itoa or similar function to convert from
an int (or whatever)
to a string, I went to code the obvious function
using sprintf, but
that function isn't available.
Can somebody suggest how I might implement such a
function?
-S

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Post by Steve Brown
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Post by Steve Brown
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[Ken Jackson]

If you want to convert a 16-bit binary value into text, you should
check out these two links. They are two versions of the same
algorithm written by John Payson and documented by Scott Dattalo:

<http://www.dattalo.com/technical/software/pic/bcd.txt> and
<http://www.piclist.com/techref/microchip/math/radix/b2bu-16b5d.htm>

I originally wrote a straight-forward function that used division
and modulo, but it took too much time so I searched and found
this. It's some of the most optimized PIC code I've seen.

It actually produces BCD, but of course you just add the ASCII '0'
character to each byte to get ASCII.

Also note that the base link has lots of useful PIC code:
<http://www.piclist.com/techref/microchip/>

-Ken Jackson

Post by Steve Brown
Hi all,
I'm still getting to grips with the PIC14 port of SDCC, so forgive me if
the answer are obvious; they aren't to me ;-)
Needing an itoa or similar function to convert from an int (or whatever)
to a string, I went to code the obvious function using sprintf, but
that function isn't available.
Can somebody suggest how I might implement such a function?
-S