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#include <stdint.h>
#include <stdio.h>
uint8_t swap_half(uint8_t val)
{
return (val << 4) | (val >> 4);
}
uint32_t swap(uint32_t data)
{
uint8_t b1 = ((data >> 16) & 0xFF00) >> 8;
b1 = swap_half(b1);
uint8_t b2 = ((data >> 16) & 0xFF);
b2 = swap_half(b2);
return (data << 16) | (b1 & 0x000000FF) << 8 | (b2 & 0x000000FF);
}
int main()
{
uint32_t data = 0x1baacc8b; // need 0xcc8bb1aa
printf("\ndata before swapping : %X", data);
data = swap(data);
printf("\ndata after swapping : %X", data);
return 0;
}