最新的MSP430普通IO模拟IIC程序!

#include #include #include msp430x41x.h>//------------------------------------------#define IicWpDirOut           P6DIR |=  BIT5#define IicWpLow              P6OUT &=~ BIT5           #define IicWpHig              P6OUT |=  BIT5#define IicSclDirOut          P6DIR |=  BIT6#define IicSclLow             P6OUT &=~ BIT6            #define IicSclHig             P6OUT |=  BIT6#define IicSdaDirOut          P6OUT &= ~BIT7#define IicSdaLow             P6DIR |=  BIT7            #define IicSdaHig             P6DIR &=~ BIT7#define IicSdaInSt            P6IN  &   BIT7bool AckErr;//------------------------------ *** - 时间延时 - *** ------------------------------//void Delay(unsigned int count){unsigned int i;_NOP();_NOP();for(i=count; i>0; i--);}void IIcDelay(void){_NOP();}//-----***-IIC初始化-***-----//void IicInit(void){IicWpDirOut;IicSdaDirOut;IicSclDirOut;IicWpHig;IicSdaHig;IicSclHig;}//-----***-IIC启示-***-----//void IicStart(void)                 {IicSdaHig;//IicSda=1;IIcDelay();IicSclHig;//IicScl=1;IIcDelay();IicSdaLow;//IicSda=0;IIcDelay();IicSclLow;//IicScl=0;IIcDelay();}//-----***-IIC停止-***-----//void IicStop(void)                 {IicSdaLow;//IicSda=0;IIcDelay();IicSclHig;//IicScl=1;IIcDelay();IicSdaHig;//IicSda=1;IIcDelay();}//-----***-IIC应答-***-----//void SendAcknowledge(bool ack)               {IicSdaDirOut;if(ack)//IicSda=ack;{IicSdaHig;}else{IicSdaLow;}IIcDelay();IicSclHig;//IicScl=1;IIcDelay();IicSclLow;//IicScl=0;IIcDelay();}            //-----***-从slave端读取一个数据-***-----//unsigned char IicReceiveByte(void){unsigned char i;unsigned char bytedata=0;IicSdaDirOut;IicSdaHig;//IicSda=1;for(i=0;i<8;i++){IicSclHig;//IicScl=1;IIcDelay();bytedata<=1;if(IicSdaInSt){bytedata |=0x01;}else{bytedata &=0xfe;}IicSclLow;//IicScl=0;IIcDelay();}IicSdaDirOut;return bytedata;}//-----***-传送一个 Byte 数据到 slave-***-----//void IicSentByte(unsigned char DataByte)               {unsigned char i;for(i=0;i<8;i++){if(DataByte & 0x80){IicSdaHig;//IicSda=1;}else{IicSdaLow;//IicSda=0;}DataByte <=1;IIcDelay();IicSclHig;//IicScl=1;IIcDelay();IicSclLow;//IicScl=0;IIcDelay();}IicSdaHig;//IicSda=1;-----Y------D---IicSdaDirInIIcDelay();IicSclHig;//IicScl=1;IIcDelay();IicSclLow;//IicScl=0;IIcDelay();}//-----***-无扇区读---多字节-***-----////读取指定器件无扇区指定地址多字节数据到指定地址//Device=器件地址---单字节//DataAdd=字节地址---单字节void IicMuchByteRead(unsigned char DataAdd,unsigned char *DataDptr,unsigned char DataLend){unsigned char i;_DINT();WDT();IicInit();IicStart();IicSentByte(0xa0);IicSentByte(DataAdd);IicStart();IicSentByte(0xa1);for(i=DataLend-1;i>0;i--){*DataDptr=IicReceiveByte();DataDptr++;SendAcknowledge(0);}*DataDptr=IicReceiveByte();SendAcknowledge(1);IicStop();WDT();Delay(500);_EINT();}//-----***-无扇区写---多字节-***-----////写入指定器件无扇区指定地址中的多字节数据//Device=器件地址---单字节//DataAdd=字节地址---双字节//DataByte=被存放数据的地址//DataLend=被存放数据的长度void IicMuchByteWrite(unsigned char DataAdd,unsigned char *DataDptr,unsigned char DataLend){unsigned char i;_DINT();WDT();IicInit();IicWpLow;IicStart();IicSentByte(0xa0);IicSentByte(DataAdd);for(i=DataLend;i>0;i--){IicSentByte(*DataDptr);DataDptr++;   }IicStop();WDT();Delay(3500);IicWpHig;_EINT();}//---特别说明//---利用430芯片来模拟IIC，是不能够把SDA设置为输出模式而是//---设置为输入，然后利用方向控制器来输出高或者低//---如下：#define IicSdaDirOut          P6OUT &= ~BIT7#define IicSdaLow             P6DIR |=  BIT7            #define IicSdaHig             P6DIR &=~ BIT7#define IicSdaInSt            P6IN  &   BIT7