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unsigned char b1=0x3Fu;
unsigned char b2=0xF0u;
unsigned short int data;
data=((unsigned short int)b1<<8)|((unsigned short int)b2;
data = ((unsigned int)byte1 << 8) + byte2;
另外注意下byte1和byte2的类型
data = (byte1 << 8) + byte2;
data = (byte1 << 8) | byte2;