DSP28335 IIC读写M24M02的多个数据

以下是DSP28335使用IIC读写M24M02的多个数据的代码示例：

首先需要初始化IIC，如下所示：

void InitI2C(void)
{
    // 设置I2C引脚
    EALLOW;
    GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0;
    GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1;
    GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1;
    EDIS;
    
    // 初始化I2C
    I2caRegs.I2CMDR.bit.IRS = 0;     // I2C复位
    I2caRegs.I2CPSC.all = 6;         // 分频器值为6，时钟频率为150kHz
    I2caRegs.I2CSAR = M24M02_ADDR;   // 设置从设备地址
    I2caRegs.I2CMDR.bit.IRS = 1;     // 退出I2C复位
}

然后可以定义一个函数来写入多个数据：

void WriteMultipleBytes(uint16_t addr, uint16_t num, uint8_t *data)
{
    uint16_t i;
    
    // 发送起始信号
    I2caRegs.I2CMDR.bit.STP = 1;
    I2caRegs.I2CMDR.bit.MST = 1;
    I2caRegs.I2CDXR = (M24M02_ADDR << 1) & 0xFE;
    I2caRegs.I2CMDR.bit.TRX = 1;
    I2caRegs.I2CMDR.bit.STT = 1;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
    
    // 发送地址
    I2caRegs.I2CDXR = (addr >> 8) & 0xFF;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
    I2caRegs.I2CDXR = addr & 0xFF;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
    
    // 发送数据
    for (i = 0; i < num; i++)
    {
        I2caRegs.I2CDXR = data[i];
        while (I2caRegs.I2CSTR.bit.ARDY == 0);
    }
    
    // 发送停止信号
    I2caRegs.I2CMDR.bit.STP = 1;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
}

然后可以定义一个函数来读取多个数据：

void ReadMultipleBytes(uint16_t addr, uint16_t num, uint8_t *data)
{
    uint16_t i;
    
    // 发送起始信号
    I2caRegs.I2CMDR.bit.STP = 1;
    I2caRegs.I2CMDR.bit.MST = 1;
    I2caRegs.I2CDXR = (M24M02_ADDR << 1) & 0xFE;
    I2caRegs.I2CMDR.bit.TRX = 1;
    I2caRegs.I2CMDR.bit.STT = 1;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
    
    // 发送地址
    I2caRegs.I2CDXR = (addr >> 8) & 0xFF;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
    I2caRegs.I2CDXR = addr & 0xFF;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
    
    // 发送重复起始信号
    I2caRegs.I2CMDR.bit.STP = 1;
    I2caRegs.I2CMDR.bit.MST = 1;
    I2caRegs.I2CDXR = (M24M02_ADDR << 1) | 0x01;
    I2caRegs.I2CMDR.bit.TRX = 0;
    I2caRegs.I2CMDR.bit.STT = 1;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
    
    // 读取数据
    for (i = 0; i < num; i++)
    {
        while (I2caRegs.I2CSTR.bit.RRDY == 0);
        data[i] = I2caRegs.I2CDRR;
    }
    
    // 发送停止信号
    I2caRegs.I2CMDR.bit.STP = 1;
    while (I2caRegs.I2CSTR.bit.ARDY == 0);
}

使用上述函数可以实现对M24M02的多个数据的读写操作。