On Fri, Sep 23, 2011 at 08:06:49AM +0200, Maarten Brock wrote:
> Hello Peter,
>
<snip>
> > The code above appears to be loading the contents of
> > sys_rstack (at 0x10 in data) in to r7 but something undesirable happens
> > after that (which may well be operator error on my part).
>
> Since you use an explicit cast to char on the parameter passed to a
> varargs function (sprintf) the value is not passed as an int as normal.
> This is an extension to save memory. But then your formatter must also
> tell it to expect a char instead of an int as %x does. Maybe it's better
> to just remove the inline cast.
>
> HTH,
> Maarten
>
Sorry, my bad I originally had
sprintf (str,"%x", *sys_rstack);
and that gives 61 on the lcd, however 61 isn't the correct value, 45 is. But
I see wbere my problem is, because 61 is what is in 45 of data (i.e. what
10 is pointing to and what I asked for). What I really want is
sprintf (str,"%x", sys_rstack);
which is the contents of Data 10h. However the above gets 4000 on the LCD
because its a pointer.
01B1 12 48 50 706 lcall _lcd_print
707 ; main.c:107: sprintf (str,"%x", sys_rstac
k);
01B4 AD 10 708 mov r5,_sys_rstack
01B6 7E 00 709 mov r6,#0x00
01B8 7F 40 710 mov r7,#0x40
01BA C0 05 711 push ar5
01BC C0 06 712 push ar6
01BE C0 07 713 push ar7
however
sprintf (str,"%x", (int) sys_rstack);
does what I wish and displays the (truncated) pointer value correctly. As I
expected my problem was an incorrect understanding of what I wanted :-)
By the way
sprintf (str,"%hx", *sys_rstack);
displays Hx on the lcd not the now expected 61. In any case thanks for the
help!
Peter Van Epp
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