标签: p1口

在51上用P1口模拟I2C下面是用普通C51实现的I2C基本电平模拟函数和通用函数。 /*  电平模拟函数和基本读写函数     void IIC_Start(void);     void IIC_Stop(void);     void SEND_0(void);     void SEND_1(void);     bit Check_Acknowledge(void);     void Write_Byte(uchar b)reentrant;     bit Write_N_Bytes(uchar *buffer,uchar n)reentrant;     bit Read_N_Bytes(uchar SlaveAdr,uchar n,uchar *buffer);     uchar Read_Byte(void)reentrant; */     #include     #include     #include     #include"aiic_51.h"     sbit SCL=P1^6;     sbit SDA=P1^7;     void DELAY(uint t)     {         while(t!=0)             t--;     }     void IIC_Start(void)     {         //启动I2C总线的函数，当SCL为高电平时使SDA产生一个负跳变         SDA=1;         SCL=1;         DELAY(DELAY_TIME);         SDA=0;         DELAY(DELAY_TIME);         SCL=0;  ……