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data type conversion

 
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kmp84



Joined: 02 Feb 2010
Posts: 354

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data type conversion
PostPosted: Tue Feb 19, 2013 2:56 pm     Reply with quote

Hi friends!
I've been searching example for convert data to and from like this :

Code:
 0x11,0x23,0x45,0x67 which represent 11234567(dec) to 0xAB6D07 and reverse operation.
Gabriel



Joined: 03 Aug 2009
Posts: 1067
Location: Panama

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PostPosted: Tue Feb 19, 2013 3:57 pm     Reply with quote

binary coded decimal? - to decimal

and then decimal to hex

I'm sure you can find plenty examples online...


This is what i got... not exactly what you want...

Code:
int BCD_to_HEX(int bcdnum)
{

   high=bcdnum;         // initialize both variables with BCD   
   low=bcdnum;

   high&=0XF0;          // clear low byte, keep high byte
   low&=0X0F;           // clear high byte, keep low byte

   if(high!=0X00)       // since incoming byte is bcd, if highbyte=0 no conversion is nessesary
      {
         swap(high);    // switch lowbyte with high byte
         high*=0X0A;    // multiply by ten
      }

   high+=low;           // add high and low byte

   Return(high);        // return high, now containing minutes in hex
}




Code:
int HEX_to_BCD(int hexnum)
{
   if(hexnum>0X09)                  // if input less than 10 no conversion is nessesary
      {
         high=hexnum/0X0A;          // devide input by 10 keep result as high byte(there is no reminder)
         low=(hexnum-(high*0X0A));  // substract highbyte * 10 from input, save as low byte
         swap(high);                // switch lowbyte with high byte
         high|=low;                 // or together high and low
         Return(high);              // return byte converted to BCD
      }
   Return(hexnum);                  // in case no conversion is nessesary return input

}



.... my functions dont handle 4 bytes at the time but... it should get you going...


EDIT: inside the compiler HEX is DEC...
Code:
int x = 0xFF;

is the same as
Code:
int x = 255;


G.
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CCS PCM 5.078 & CCS PCH 5.093
Ttelmah



Joined: 11 Mar 2010
Posts: 19537

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PostPosted: Wed Feb 20, 2013 1:50 am     Reply with quote

I'd make one addendum to this. Inside the chip, _everything_ is binary. Decimal, hex, octal etc., are all converted by the compiler to binary.

Best Wishes
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