Hello Peter,
> In the main routine a printf gets the wrong value:
>
> extern __data uint8 * __data sys_rstack;
>
> // string for LCD output
> #define STR_LEN 80
> __xdata uint8 str[STR_LEN];
>
> main()
> {
> sprintf (str,"%x", (uint8) *sys_rstack);
> lcd_print(2, str);
>
> generates:
> 707 ; main.c:107: sprintf (str,"%x",
> (uint8) *
> sys_rstack);
> 01B4 A9 10 708 mov r1,_sys_rstack
> 01B6 87 07 709 mov ar7,@r1
> 01B8 C0 07 710 push ar7
> 01BA 74 53 711 mov a,#__str_3
> 01BC C0 E0 712 push acc
> 01BE 74 7E 713 mov a,#(__str_3 >> 8)
> 01C0 C0 E0 714 push acc
> 01C2 74 80 715 mov a,#0x80
> 01C4 C0 E0 716 push acc
> 01C6 74 DC 717 mov a,#_str
> 01C8 C0 E0 718 push acc
> 01CA 74 01 719 mov a,#(_str >> 8)
> 01CC C0 E0 720 push acc
> 01CE E4 721 clr a
> 01CF C0 E0 722 push acc
> 01D1 12 7D 15 723 lcall _sprintf
> 01D4 E5 81 724 mov a,sp
> 01D6 24 F9 725 add a,#0xf9
> 01D8 F5 81 726 mov sp,a
> 727 ; main.c:108: lcd_print(2, str);
>
> 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
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