Q:

Write MACRO to swap the bytes in 32bit Integer Variable

YasminRadwan26
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2022-06-25
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Write MACRO to swap the bytes in 32bit Integer Variable

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YasminRadwan26
2022-06-25
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I have already written this program in endianness conversion. But here I am creating a Macro for the same.

#include <stdio.h>
#include <inttypes.h>
#define SWAP_BYTES(u32Value) ((u32Value & 0x000000FF) << 24)\
|((u32Value & 0x0000FF00) << 8) \
|((u32Value & 0x00FF0000) >> 8) \
|((u32Value & 0xFF000000) >> 24)
int main()
{
    uint32_t u32CheckData  = 0x11223344;
    uint32_t u32Result = 0;
    u32Result = SWAP_BYTES(u32CheckData);  //swap the data
    printf("0x%x\n",u32Result);
    return 0;
}

Output:

0x44332211

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