#define uint8 unsigned char
#define uint16 unsigned int

方法一：强制类型转换

uint8 byte8_arry[2] = {0xAA,0xBB};
uint16 word16 = *(uint16 *)byte8_arry;

方法二：联合体

typedef union{
	uint16 word16;
	uint8 byte8_arry[2];
}word_bytes;
word_bytes a;
a = 0xAABB;

方法三：移位

uint8 byte8_arry[2]={0xAA,0xBB};
uint16 word16 = byte8_arry[0]<<8 + byte8_arry[1];