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How can I implement something like that in CCS C compiler

 
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Guille
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How can I implement something like that in CCS C compiler
PostPosted: Wed Sep 05, 2007 2:25 pm     Reply with quote
Code:
typedef union{
      unsigned int  WORD[1];
      unsigned char BYTE[2];
      tData8bits    BYTEbits[2];
      }tData2bytes;

typedef union{
      unsigned long DWORD[1];
      unsigned int  WORD[2];
      unsigned char BYTE[4];
      tData8bits    BYTEbits[4];
      }tData4bytes;

I need to implement a code like that.
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Wed Sep 05, 2007 3:40 pm     Reply with quote
The variable name BYTE is not allowed in CCS as it is a reserved keyword, you will have to choose another name. Then, if you have to change the name of BYTE, it is a good idea to change the name of Word as well.

Code:
typedef int8 tData8bits;

typedef union{
unsigned int myWORD[1];
unsigned char myBYTE[2];
tData8bits BYTEbits[2];
}tData2bytes;

typedef union{
unsigned long myDWORD[1];
unsigned int myWORD[2];
unsigned char myBYTE[4];
tData8bits BYTEbits[4];
}tData4bytes;
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Sep 05, 2007 3:40 pm     Reply with quote
You can do it, but it requires vs. 4 of the compiler to do the array of bits.
The program shown below displays the following output. It was tested
with vs. 4.053.
Quote:

12345678
12345678
12345678
12345678


Here is the demo program:
Code:

#include <16F877.h>
#fuses XT, NOWDT, PUT, BROWNOUT, NOLVP
#use Delay(Clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

typedef union
{
int32 dword[1];
int16 words[2];
int8  bytes[4];
int1  bits[32];
}t_32bits;

//==================================
void main(void)
{
int8 i;
int32 temp;
t_32bits data;

data.dword[0] = 0x12345678;

printf("%lx\n\r", data.dword[0]);
printf("%lx%lx\n\r", data.words[1], data.words[0]);
printf("%x%x%x%x\n\r", data.bytes[3], data.bytes[2],
                      data.bytes[1], data.bytes[0]);

// Shift the bit array into a 32-bit variable and display it.
temp = 0;
for(i=0; i <32; i++)
   {
    shift_right(&temp, 4, data.bits[i]);
   }

printf("%lx\n\r", temp);

while(1);
}
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