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Help with union

 
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YulL



Joined: 29 Sep 2004
Posts: 39
Location: Paris (France)

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Help with union
PostPosted: Tue Oct 19, 2004 2:24 am     Reply with quote

Hi, I'm trying to send 0x100001C0C0 on the serial port. I've made a code but I have errors...

union dblock { int8 SABM[5]; } octet;
int8 count;

octet.SABM=0x100001C0C0L;

for ( count=0;count<5;count++ ) { putc( octet.SABM[count] ); }

If you have any idea... Embarassed

Thanks by advance
dvsoft



Joined: 28 Nov 2003
Posts: 46

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PostPosted: Tue Oct 19, 2004 4:18 am     Reply with quote

bonjour

this code
union dblock { int8 SABM[5]; } octet;
octet.SABM=0x100001C0C0L
is not Valide

union for one int32

union {
int32 Reg;
int8 Map[4];
}TU32Reg;

TU32Reg Test;
int8 ByteCnt;

Test.Reg = 0xFF00FF00;
ByteCnt = 0;
do {
putc(Test.Map[ByteCnt]);
} while (++ByteCnt < 5);

But the Value 0x100001C0C0 is > to int32
0x100001C0C0 = 4294974476
int32
0xFFFFFFFF = 4294967295


Alain
dvsoft



Joined: 28 Nov 2003
Posts: 46

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PostPosted: Tue Oct 19, 2004 4:19 am     Reply with quote

sorry

Correct end loop

while (++ByteCnt < 4);
Alain
YulL



Joined: 29 Sep 2004
Posts: 39
Location: Paris (France)

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PostPosted: Tue Oct 19, 2004 7:17 am     Reply with quote

Ok thanks you dvsoft, but I think it should be also possible with pointers, what do you think about it? Rolling Eyes
dvsoft



Joined: 28 Nov 2003
Posts: 46

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PostPosted: Tue Oct 19, 2004 8:06 am     Reply with quote

re,

yes it is possible, with pointers. but I do not think that it is faster

Alain
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Tue Oct 19, 2004 8:22 am     Reply with quote

Quote:
yes it is possible, with pointers. but I do not think that it is faster


It should be. That is what the FSR's are for.
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