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#include <stdio.h>
#define WIRTE_UINT(des ,x ,pos ,len) ( \
(des) \
& \
~( /* 除要修改的位为0,其余都为1 */ \
( \
(1<<(len))-1 /* 长度为len位的1 */ \
) \
<<(32-(pos)-(len)) /* 左移32-(pos)-(len)位 */ \
) \
| \
( \
(x) \
<<(32-(pos)-(len)) \
) \
)
#define READ_UINT(src ,pos ,len) ( \
( \
( \
(unsigned)(src) \
) \
>>(32-(pos)-(len)) /* 逻辑右移32-(pos)-(len)位 */ \
) \
& \
( \
(1<<(len))-1 /* 长度为len位的1 */ \
) \
)
int main() // 1111111111222222222233
{ //bit 01234567890123456789012345678901
unsigned int des = 0x661; // 00000000000000000000011001100001
des = WIRTE_UINT(des ,3 ,28 ,2); // 00000000000000000000011001101101
printf("des==0x%08X\n",des);
unsigned int r = READ_UINT(des ,28 ,2);
printf("r==%d\n",r);
return 0;
}
//des==0x0000066D
//r==3