On Wed, Jul 06, 2005 at 07:18:48PM +0000, Martin Fflores wrote:
> hi! everyone, i have a rare problems here, i dont know if i do somethign
> wrong or the compiler have some problems, when i read a value from a port(a
> byte) the first time it's retun to me a byte so i catch and use printf to
> show this value, the secon time its return to me a integer value or a dont
> know, let me give you a example:
>
> char value=0;
> __asm__ __volalile__("cli;inb $0x60,%0;sti;":"=r"(value));
> printf("%x",value);// the first time usually return 1c
> // this is the second time
> __asm__ __volalile__("cli;inb $0x60,%0;sti;":"=r"(value));
> printf("%x",value);// this print in teh screen ffffffa ainteger value
>
> i'm expecting a ACK response for the keyboard ACK is in the ffffffa the
> first byte buti cant never know ir caouse when i ask for ack it inst ack in
> ffffffa and it is bigger than a byte why iot happend??????????????????''
man 3 printf
o,u,x,X The unsigned int argument is converted to unsigned
~~~~~~~~~~~~~~~~~~~~~
octal (o), unsigned decimal (u), or unsigned hexadecimal
(x and X) notation.
The length modifier
hh A following integer conversion corresponds to a
signed char or unsigned char argument, or a
following n conversion corresponds to a pointer
to a signed char argument.
the 'char' value is signed, and is implicitely converted
to an int, which in turn is printed as unsigned hex 'x'
0xfa (-5) -> 0xfffffffa
best,
Herbert
> Take Care Folks.
>
> Martin Flores
>
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