sprintf x signed values

[Ricardo_RauppV]

Hi people

I´m working with 52235 and I´m trying to print a negative value for a char (int8) wich is -2, by using sprintf function, but the output is "254".  

I did:

{

int8 sdata_8;

   sdata_8=-2;

   sprintf(lcd_controller.text_data_array,"   %hi.%01u",
           sdata_816/10,

I did the same experience using int16 and so I had success..

Is there some special care to use sprintf with char?

By the way, how can copy a negative value of a int8 to a int16?

I tryied:

sdata_16=sdata_8; and I got the calue 254 ..not -02 ...

Thanks guys ...

Ricardo Raupp

[CompilerGuru]

Is this int8 type you are using signed?
It apears to be unsigned, note that
typedef signed char int8;
is needed, a typedef "typedef char int8;" only creates a singed type if char is signed, and that is defined by the compiler, or the ABI the compiler follows.

Daniel

[Ricardo_RauppV]

Daniel

You were rigth...my char was (some spirit did it..I don´t remember...) defined as unsigned char by default.

Follow attached the CW screeshoot where it was set...

After I reset it...I got happy again ...

Now it is working fine...

Saturday nigth will ne good ....

Thanks for your attention!!!!!!

Ricardo Raupp

[Ricardo_RauppV]

Dear Daniel

I think the int8 definition  is ok.

I extract the below form ...\include\mcf52xxx.h

/*
 * The basic data types
 */
typedef unsigned char       uint8;  /*  8 bits */
typedef unsigned short int  uint16; /* 16 bits */
typedef unsigned long int   uint32; /* 32 bits */

typedef char                int8;   /*  8 bits */
typedef short int           int16;  /* 16 bits */
typedef int                 int32;  /* 32 bits */

typedef volatile int8       vint8;  /*  8 bits */
typedef volatile int16      vint16; /* 16 bits */
typedef volatile int32      vint32; /* 32 bits */

typedef volatile uint8      vuint8;  /*  8 bits */
typedef volatile uint16     vuint16; /* 16 bits */
typedef volatile uint32     vuint32; /* 32 bits */

Curious:

- In a text:

a=-2;

 if(a>0.) ...

The answer was true !!!like the considered value was 254 and not -2 ...

Should I change int8 definition?

Thanks for "saturday help" !!!!

Ricardo Raupp