51单片机实验例程

				
				/****h函数声明部分***********/
				
				extern bit ack;
				
				//起动总线函数
				extern void Start_I2c();
				
				//结束总线函数  
				extern void Stop_I2c();
				
				//应答子函数
				extern void Ack_I2c(bit a);
				
				//字节数据发送函数
				extern void  SendByte(unsigned char  c);
				
				//有子地址发送多字节数据函数               
				extern bit ISendStr(unsigned char sla,unsigned char suba,unsigned char *s,unsigned char no) ;
				
				//无子地址发送多字节数据函数   
				extern bit ISendStrExt(unsigned char sla,unsigned char *s,unsigned char no);
				
				//无子地址读字节数据函数               
				extern unsigned char RcvByte();
				
				//有子地址读取多字节数据函数               
				extern bit IRcvStr(unsigned char sla,unsigned char suba,unsigned char *s,unsigned char no);
				
				//无子地址读取多字节数据函数               
				extern bit IRcvStrExt(unsigned char sla,unsigned char *s,unsigned char no);
				
				extern void HC595SendData(unsigned int SendVal);
				
				extern unsigned long ReHC74165(void);