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show bits in a printf???

 
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denin_online



Joined: 22 Nov 2006
Posts: 1

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show bits in a printf???
PostPosted: Thu Dec 21, 2006 7:53 pm     Reply with quote
Hello

I’m trying to show bytes in the printf, is there some format that I can show the bites of a valor.
Like to show decimal is “ %d ” and hex is “ %x” ….

I would be grateful if someone helps me.

Thanks,
Denin_online
jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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PostPosted: Thu Dec 21, 2006 7:57 pm     Reply with quote
You use both bits and bytes in your post, so I'm not sure if this will help. Here is a post describing how to print the bits in a byte.... binary....

http://www.ccsinfo.com/forum/viewtopic.php?t=25821&highlight=print+bit
Guest
PostPosted: Fri Dec 22, 2006 5:10 am     Reply with quote
here is Bob version its for 16bits but you can change it for 8bits easy

Code:

///////////////////////////////////////////////////////
/// coverts the final value to binary 16bits
void PrintAsBinary ( int16 value )
{   char display[16];
    int i;
    int binaryValue;
    for ( i = 0; i < LENGTH_OF_SHORT; i++ )
    {
        /* Check MSB against 1 */
        if ( 0x8000 == ( value & 0x8000 ) )
        {
            binaryValue = 1;
            display[i]='1';
        }
        else
        {
            binaryValue = 0;
             display[i]='x';
        }
        /* Print the binary value */
         printf(lcd_putc,"%c",display[i] );
        /* Shift next bit into mask position */
        value = value << 1;
    }
}
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Fri Dec 22, 2006 10:04 am     Reply with quote
I like my version below as it is the most optimized version I've seen and it is very easy to adapt to other variable sizes (only requires changing the int16 to int8 or int32).

Code:
///////////////////////////////////////////////////////
// Prints the given value as binary.
void PrintAsBinary(int16 Value)
{
  int8 i;

  i = sizeof(Value) * 8;    // Get number of bits.
  do
  {
    // Check MSB against 1 and print the value.
    if (shift_right(&Value, sizeof(Value), 0) == 1)
      putc('1');
    else
      putc('0');
  } while (--i);
}
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