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。 <BR><BR> /* 电平模拟函数和基本读写函数 <BR> void IIC_Start(void); <BR> void IIC_Stop(void); <BR> void SEND_0(void); <BR> void SEND_1(void); <BR> bit Check_Acknowledge(void); <BR> void Write_Byte(uchar b)reentrant; <BR> bit Write_N_Bytes(uchar *buffer,uchar n)reentrant; <BR> bit Read_N_Bytes(uchar SlaveAdr,uchar n,uchar *buffer); <BR> uchar Read_Byte(void)reentrant; <BR> */ <BR><BR> #include<STRING.H> <BR> #include<REG52.H> <BR> #include<INTRINS.H> <BR> #include"aiic_51.h" <BR><BR> sbit SCL=P1^6; <BR> sbit SDA=P1^7; <BR><BR> void DELAY(uint t) <BR> { <BR> while(t!=0) <BR> t--; <BR> } <BR><BR> void IIC_Start(void) <BR> { <BR> //启动I2C总线的函数，当SCL为高电平时使SDA产生一个负跳变 <BR> SDA=1; <BR> SCL=1; <BR> DELAY(DELAY_TIME); <BR> SDA=0; <BR> DELAY(DELAY_TIME); <BR> SCL=0; <BR> DELAY(DELAY_TIME); <BR> } <BR><BR> void IIC_Stop(void) <BR> { <BR> //终止I2C总线，当SCL为高电平时使SDA产生一个正跳变 <BR> SDA=0; <BR> SCL=1; <BR> DELAY(DELAY_TIME);
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