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using Make16() on signed variables

 
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ccs@jeffmann.endjunk.com
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using Make16() on signed variables
PostPosted: Tue Feb 22, 2005 9:39 pm     Reply with quote
I do not understnad if I can use make16() to combine two 8 bit nibbles into a signed 16 bit int16.

the manual explains make16() as doing:
Code:
i16 = (int16)(varhigh&0xff)*0x100+(varlow&0xff)


so, I am concerned that I cannot do:
[/code]
unsigned int8 byte1, byte2;
signed int16 origional, final;

byte1=make8(origional,1);
byte2=make8(origional,0);

final=make16(byte1, byte2);
[code]

does the signing cause a problem in this case?
bluetooth



Joined: 08 Jan 2005
Posts: 74

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PostPosted: Tue Feb 22, 2005 10:21 pm     Reply with quote
Since it's simple, I tried it....

The following:

Code:

   origional = -23456;
   
   byte1=make8(origional,1);
   byte2=make8(origional,0);

   final=make16(byte1, byte2);


Results in byte1 = 0xA4 and byte 2 = 0x60, and final = original = 0xa460.

So, with 3.212 on a 452 it works fine....

Bytes is bytes.... Wink
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