本帖最后由 hkhkdyx 于 2014-5-5 23:24 编辑
/*
* I2C_Init(I2C_MODE i2c_mode, UCSSELx ucsselx)
* 初始化I2C
*
* 参数:
* i2c_mode --I2C主从模式设置
* |__ Slave
* |__ Master
* |
* ucsselx --I2C时钟信号选择
* |__ UCLKI
* |__ ACLK
* |__ SMCLK
* 输出:
* 无
*
*/
void I2C_Init(I2C_MODE i2c_mode, UCSSELx ucsselx)
{
_disable_interrupts();
P1SEL |= BIT6 + BIT7; // GPIO 配置为USCI_B0功能
P1SEL2|= BIT6 + BIT7; // GPIO 配置为USCI_B0功能
// Own address is a 7-bit address | Address slave with 7-bit address | Single master environment
switch(i2c_mode)
{
case Slave:
UCB0CTL0 = UCMODE_3 + UCSYNC; //同步通信I2C从机状态
break;
case Master:
UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC; //同步通信I2C主机状态
break;
}
switch(ucsselx)
{
case UCLKI:
UCB0CTL1 = UCSSEL_0 + UCSWRST; // Use UCLKI,USCI Software Reset
break;
case ACLK:
UCB0CTL1 = UCSSEL_1 + UCSWRST; // Use ACLK,USCI Software Reset
break;
case SMCLK:
UCB0CTL1 = UCSSEL_2 + UCSWRST; // Use SMCLK,USCI Software Reset
break;
}
UCB0BR0 =I2C_BAUDRATE_DIV ; // 除了分频系数，实际波特率还与时钟有关
UCB0BR1 = 0; // 这一级别的分频一般不启用
UCB0I2CSA = SLAVE_ADDR; // I2C从机地址，可在宏定义中修改
UCB0CTL1 &= ~UCSWRST; // 开启I2C
_enable_interrupts();
}
void I2C_WriteData(uint8 data)
{
I2C_Init(Master,SMCLK);
i2c_delay_ms(1);
while((UCB0CTL1 & UCTXSTP)); // 确保总线空闲
UCB0CTL1 |= UCTR + UCTXSTT; // I2C TX, start condition
while((IFG2 & UCB0TXIFG)==0); // UCB0TXIFG is set when UCB0TXBUF is empty.
UCB0TXBUF = SlaveAddress; // Load TX buffer
while((IFG2 & UCB0TXIFG)==0); // UCB0TXIFG is set when UCB0TXBUF is empty.
UCB0TXBUF = data;
while((IFG2 & UCB0TXIFG)==0); // UCB0TXIFG is set when UCB0TXBUF is empty.
UCB0CTL1 |= UCTXSTP; // I2C stop condition
i2c_delay_ms(1);
}
以上我只上传了我的 iic初始化和 iic写函数。用CCSV5编译器进行调试的时候，程序总是卡在图中红线位置。不知道为啥啊？真心给跪了。都调试了两天，搞不懂原因，求大神们指点指点小弟！另外还有个问题是，如何收到从机发来的应答信号（ACK）？
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