Re: [avr-gcc-list] 24 bit integers

[Carl Wall]

Bernt

You might want to check out "inttypes.h"  which is located in 
 /usr/local/avr/include/     on my machine, it has what int, etc 
are being defined as.  Looks like "long" is int32_t  and "unsigned
 long" is unit32_t, and "long long" is int64_t if you need a few
more bits ;-))
  Carl

On Sat, Jan 27, 2001 at 04:09:13PM +0100, Bernt Hustad Hembre wrote:
> 
> Hi.
> 
> I've tried to find out how int, char, long etc. is defined in gcc for avr.
> I'm preaty sure char is 8 bit,
> quite sure int is 16 bit
> not at all sure that long is 32 bit.
> 
> I have a 24bit ADC (HI7191). It return either a 24bit signed or unsigned
> integer. And I want to expand it to a 32 bit integer (long?).
> 
> Ie. I get adc_data[3] returned from the measuring routine.
> 
> I think this is right for unsigned:
> thirtytwobit = adc_data[0] + (adc_data[1]*256) + (adc_data[2]*65536);
> 
> But how can I get it right for signed values?
> Something like this?:
> thirtytwobitsigned = (adc_data[0] + (adc_data[1]*256) +
> ((adc_data[2]&0x7f)*65536)) * (adc_data[2]&0x80) * (-1);
> 
> What is the size/accurancy of float, double etc.?
> Where are these defined?
> 
> Thanks in advance.
> 
> Bernie
> Tlf.: 92648923
> address@hidden
> 
> 
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-- 
Carl A. Wall    VE3APY                Toronto, Ontario, Canada
"Created on DEBIAN 2.2,  an alternative to Microsoft Systems
  and a GNU/Linux distribution of Open Source programming"