大端模式和小端模式详解(2)

以下使用代码对相关变量来进行说明

void vReceive(uint8 *tamo)

{

tamo[0]=0xa0;

tamo[1]=0xa1;

tamo[2]=0xa2;

}

temp=0x11223344;

*((uint8 *)&temp+3) = 0x55;

*((uint8 *)&temp+2) = 0x66;

*((uint8 *)&temp+1) = 0x77;

*((uint8 *)&temp) =0x88;

vReceive((uint8 *)&temp);

*((uint8 *)&temp2+3) = *((uint8*)&temp);

*((uint8 *)&temp2+2) = *((uint8 *)&temp+1);

*((uint8*)&temp2+1) = *((uint8*)&temp+2);

*((uint8 *)&temp2) = *((uint8*)&temp+3);

对以上的程序分别在keil和vc中调试查看变量

keil中：(keil中叶不完全是下面的结果，主要还是看cpu执行的是大端在前还是小端在前)

1 初始 temp=0x11223344

2 执行以下后 temp=0x88776655

*((uint8 *)&temp+3) = 0x55;

*((uint8 *)&temp+2) = 0x66;

*((uint8 *)&temp+1) = 0x77;

*((uint8 *)&temp) =0x88;

3 执行vReceive((uint8 *)&temp); 后 temp=0xa0a1a255

4 执行以下代码后 temp2=0x55a2a1a0

*((uint8 *)&temp2+3) = *((uint8*)&temp);

*((uint8 *)&temp2+2) = *((uint8 *)&temp+1);

*((uint8*)&temp2+1) = *((uint8*)&temp+2);

*((uint8 *)&temp2) = *((uint8*)&temp+3);

VC中：

1 初始 temp=0x11223344

2 执行以下后 temp=0x55667788

*((uint8 *)&temp+3) = 0x55;

*((uint8 *)&temp+2) = 0x66;

*((uint8 *)&temp+1) = 0x77;

*((uint8 *)&temp) =0x88;

3 执行vReceive((uint8 *)&temp); 后 temp=0x55a2a1a0

4 执行以下代码后 temp2=0xa0a1a255

*((uint8 *)&temp2+3) = *((uint8*)&temp);

*((uint8 *)&temp2+2) = *((uint8 *)&temp+1);

*((uint8*)&temp2+1) = *((uint8*)&temp+2);

*((uint8 *)&temp2) = *((uint8*)&temp+3);