📄 单片机控制的i2c总线高频头程序.htm
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<TD background=http://www.mcublog.com/skin/mod/line/log_r1_c5.jpg><a href=more.asp?name=lyrical&id=6423>单片机控制的I2C总线高频头程序</a></TD></TR></TBODY></TABLE></TD>
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<DIV id=showmore align=right>电视人 发表于 2005-11-26 23:21:00</DIV>
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<P>#include<reg52.h><BR>#include<stdio.h><BR>#define DELAY_TIME 100 /*不要小于100！否则可能造成时序混乱*/<BR>#define TRUE 1<BR>#define FALSE 0</P>
<P>sbit SCL=P2^1;/*假设由P2.1和P2.0控制*/<BR>sbit SDA=P2^0;</P>
<P>sbit KEYP12=P2^2;<BR>sbit KEYP13=P2^3;</P>
<P>void system_init(void);<BR>void BPS19200();<BR>void delay_ms(int number1);</P>
<P><BR>unsigned int ADD,DB1,DB2,PB,temp,temp1;<BR>unsigned int NDB;<BR>unsigned int fr;</P>
<P> void I2C_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> }</P>
<P> void I2C_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);<BR> SDA=1;<BR> DELAY(DELAY_TIME);<BR> SCL=0;<BR> DELAY(DELAY_TIME);<BR> }</P>
<P> void SEND_0(void) /* SEND ACK */<BR> {<BR> /*发送0，在SCL为高电平时使SDA信号为低*/<BR> SDA=0;<BR> SCL=1;<BR> DELAY(DELAY_TIME);<BR> SCL=0;<BR> DELAY(DELAY_TIME);<BR> }</P>
<P> void SEND_1(void)<BR> {<BR> /*发送1，在SCL为高电平时使SDA信号为高*/<BR> SDA=1;<BR> SCL=1;<BR> DELAY(DELAY_TIME);<BR> SCL=0;<BR> DELAY(DELAY_TIME);<BR> }</P>
<P> bit ChAck(void)<BR> {<BR> /*发送完一个字节后检验设备的应答信号*/<BR> SDA=1;<BR> SCL=1;<BR> DELAY(DELAY_TIME);<BR> F0=SDA;<BR> DELAY(DELAY_TIME);<BR> SCL=0;<BR> DELAY(DELAY_TIME);<BR> if(F0==1)<BR> printf("write Wrong!\n");<BR> return TRUE;<BR> }</P>
<P> void WriteI2CByte(char b)reentrant<BR> {<BR> /*向I2C总线写一个字节*/<BR> char i;<BR> for(i=0;i<8;i++)<BR> if((b<<i)&0x80)<BR> SEND_1();<BR> else<BR> SEND_0();<BR> }</P>
<P>void system_init(void)//系统初始化<BR>{ <BR> SCON = 0x50; //串口方式1,允许接收<BR> PCON= 0x80; // SMOD=1, 波特率加倍<BR> TMOD = 0x20; //定时器1 定时方式2<BR> TCON = 0x40; //设定时器1 开始计数<BR> BPS19200();<BR> TI = 1;<BR> TR1 = 1; //启动定时器<BR> //printf("AT+CNMI=2,7\r");<BR> <BR>}</P>
<P>void BPS19200()<BR>{<BR> TH1 = 0xFA; //22.1184M 19200 波特率<BR> TL1 = 0xFA;<BR>}</P>
<P><BR>void delay_ms(int number1)//延时函数<BR>{ //craystal 22.1184Mhz<BR> unsigned char i; <BR> unsigned int j;<BR> for (j=0;j<number1;j++)<BR> {<BR> for (i=0;i<229;i++); //11.0592Mhz (1ms) <BR> for (i=0;i<229;i++); //22.1184Mhz (1ms) <BR> }<BR>}</P>
<P>/***********************************主程序*********************************/</P>
<P>void main()<BR>{<BR> <BR> system_init(); //系统初始化<BR> //Start－C2－ACK－05－ACK－8A－CE－ACK－ACK－A4－ACK－STOP</P>
<P> ADD=0XC2; //地址<BR> DB1=0X0B; //分频1<BR> DB2=0X54; //分频2<BR> while(1)<BR> {<BR> KEYP12=1;<BR> KEYP13=1;<BR> if(KEYP12==0) <BR> {<BR> DB2++;<BR> if(DB2>255) DB2=0,DB1++;<BR> }<BR> if(KEYP13==0) <BR> {<BR> DB2--;<BR> if(DB2==0) DB2=255,DB1--;<BR> }</P>
<P><BR> I2C_Start();//I2C总线开始<BR> <BR> WriteI2CByte(ADD);<BR> ChAck();<BR> <BR> WriteI2CByte(DB1);<BR> ChAck();<BR> <BR> WriteI2CByte(DB2);<BR> ChAck();</P>
<P> WriteI2CByte(0x8E);<BR> ChAck();</P>
<P> <BR> NDB=(DB1*256+DB2)/16;<BR> NDB=NDB-38;<BR> <BR> if(NDB>0 && NDB<160) PB=0XA0;<BR> if(NDB>168 && NDB<464) PB=0X90;<BR> if(NDB>471 && NDB<863) PB=0X30; //频段计算<BR> <BR> WriteI2CByte(PB); //频段控制<BR> ChAck(); </P>
<P> I2C_Stop(); //I2C总线停止<BR> <BR> delay_ms(100);<BR> }<BR>}<BR></P></DIV></DIV>
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