IIC.rar_msp430f149 IIc_msp430f149i2c

#include<msp430x14x.h> void Ucb0I2c_Init(void) { P3SEL|=0x06; UCB0CTL1|=UCSWRST; //复位所有寄存器 UCB0CTL0|=UCMST+UCMODE_3+UCSYNC; //IIC主设备通讯模式 UCB0CTL1=UCSSEL_2+UCSWRST; //时钟为SMCLK，保持复位 UCB0BR0=12; //IIC通讯频率 UCB0BR1=0; UCB0I2CSA=0x00d0; //从设备地址 UCB0CTL1&=~UCSWRST; //正常操作 ｝ void Ucb0I2c_Start(unsigned int deviceaddress) { UCB0I2CSA=deviceaddress; while(UCB0CTL1 & UCTXSTP);//确认停止信号是否发送 UCB0CTL1|=UCTR+UCTXSTT; //发送一个开始信号 while(!(IFG2 & UCB0TXIFG));//等待传送结束 IFG2 &=~UCB0TXIFG; //清除USCI_B0的发射标志位 ｝ void Ucb0I2c_Writebyte(unsigned char wdata) { UCB0TXBUF=wdata; while(!(IFG2 & UCB0TXIFG)); IFG2&=~UCB0TXIFG; } void Ucb0I2c_WriteNbyte(unsigned char *index,unsigned char n) { unsigned char i; for(i=0;i<n;i++) { Ucb0I2c_Writebyte(*index); index++; } } unsigned char Ucb0I2c_Readbyte(void) { unsigned char Rdata; UCB0CTL1&=~UCTR; //接受方式 UCB0CTL1|=UCTXSTT;//发送一个开始信号 while(!(IFG2 & UCB0RXIFG)); IFG2&=~UCB0RXIFG; UCB0CTL1|=UCTXSTP;//发送一个停止信号 Rdata=UCB0RXBUF; return(Rdata); } void I2C_Writebyte(unsigned char wdata,unsigned int dataaddress,unsigned int Eep- romType,unsigned int daviceaddress) { Ucb0I2c_Start(deviceaddress); if(EepromType>16)//如果从设备的容量大于16KB { Ucb0I2c_Writebyte((unsigned char)(dataaaddress>>8));//高8位数据地址 } Ucb0I2c_Writebyte(dataaddress);//低8位数据地址 Ucb0I2c_Writebyte(wdata); UCB0CTL1|=UCTXSTP; } void I2C_WriteNbyte(unsigned char *index,unsigned char n,unsigned int dataaddress, unsigned int Eeprom Type,unsigned int deviceaddress) { Ucb0I2c_Start(deviceaddress); if(Eeprom Type>16) { Ucb0I2c_Writebyte((unsigned char)(dataaaddress>>8));//高8位数据地址 } Ucb0I2c_Writebyte(dataaddress);//低8位数据地址 Ucb0I2c_WriteNbyte(index,n); UCB0CTL1|=UCTXSTP; } unsigned char I2C_Readbyte(unsigned int dataaddress,unsigned int Eeprom Type, unsigned int deviceaddress) { volatile unsigned char Rdata; Ucb0I2c_Start(daviceaddress); if(Eeprom Type>16) { Ucb0I2c_Writebyte((unsigned char)(dataaaddress>>8));//高8位数据地址 } Ucb0I2c_Writebyte(dataaddress);//低8位数据地址 Rdata=Ucb0I2c_Readbyte(); return(Rdata); } void I2C_ReadNbyte(unsigned char *index,unsigned char n,unsigned int dataaddress, unsigned int Eeprom Type,unsigned int deviceaddress) { unsigned char i; Ucb0I2c_Start(deviceaddress); if(Eeprom Type>16) { Ucb0I2c_Writebyte((unsigned char)(dataaaddress>>8));//高8位数据地址 } Ucb0I2c_Writebyte(dataaddress);//低8位数据地址 UCB0CTL1&=~UCTR; UCB0CTL1|=UCTXSTT; for(i=0,i<n,i++) { while(!(IFG2 & UCB0RXIFG)); IFG2&=~UCB0RXIFG; *index=UCB0RXBUF; index++; } UCB0CTL1|=UCTXSTP; }