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int24

 
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ROBOTICAR



Joined: 28 Aug 2007
Posts: 45

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int24
PostPosted: Sun Mar 27, 2011 7:33 am     Reply with quote
Hi
How can i define int24 variable ? (with structure or another way) . I mean the 23th bit of this variable must be the sign bit !

Last edited by ROBOTICAR on Mon Mar 28, 2011 4:46 am; edited 1 time in total
PCM programmer



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PostPosted: Sun Mar 27, 2011 1:41 pm     Reply with quote
Why do you need a 'signed int24' ? Why can't you use a 'signed int32' ?

Where does the signed 24-bit data come from ? Is it from an A/D chip ?
Does it come in by SPI ?
ROBOTICAR



Joined: 28 Aug 2007
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PostPosted: Sun Mar 27, 2011 2:11 pm     Reply with quote
yes. It's from AD chip and comes in by spi. I used 'signed int32' for that and i know we must use this type. But i think there is a way that we can make signed int24. My friend said you can use :
Code:

typedef struct _byte
{
  unsigned int a : 8;
  unsigned int b : 8;
  unsigned int c : 8;
} int24;
void main()
{
   int24 *K;
   .
   .
   .
   .
}

I think it isn't a good way ...
Is there any way for make it ?
By the way I'm searching about ways for making unusual types.
another question. Is there way for making 64-bit variables in 8-bit structure pic microcontroller ?

thanks again ...
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