lpc2138的I2C查询方式对24lc02的读写

只看该作者 · 2007-4-28 08:10

#define I2EN 6
#define STA  5
#define STO  4
#define SI   3
#define AA   2

__inline void IIC_Start(void)
{
    I2C0CONCLR = (1 << STA) | (1 << SI) | (1 << AA);
    I2C0CONSET = (1 << STA) | (1 << I2EN);
}
__inline void IIC_RepStart(void)
{
    I2C0CONCLR = (1 << STA) | (1 << SI) | (1 << AA);
    I2C0CONSET = (1 << STA) | (1 << I2EN);
}
__inline void IIC_Stop(void)
{
    I2C0CONCLR = (1 << STA)| (1 << SI);
    I2C0CONSET = (1 << STO);
}
__inline void IIC_Wait()
{
    while(!(I2C0CONSET  & (1 << SI)));
}
__inline void IIC_WriteData(void)
{
    I2C0CONCLR = (1 << STA)| (1 << SI)| (1 << STO);
}
__inline void IIC_ReadAck(void)
{
    I2C0CONCLR = (1 << STA)| (1 << SI)| (1 << STO);
    I2C0CONSET = (1 << AA);
}
__inline void IIC_ReadNack(void)
{
    I2C0CONCLR = (1 << STA)| (1 << SI)| (1 << STO)| (1 << AA);
}
/*********************************************
*Function :Iic0非嵌套IRQ中断服务程序
*Create By:shannon
**********************************************/
void IRQIic0(void) __irq
{
    VICVectAddr = 0;//向量中断结束
}

/*********************************************
*Function :iic0初始化程序
*          通讯频率固定在80K
*Create By:shannon
**********************************************/
uint8 Iic0Init(void)
{
    uint32 bak;
    uint32 addrOffset;

    pinmap.pin.p02 = GP002SCL0;
    pinmap.pin.p03 = GP003SDA0;
    PINSEL0 = pinmap.PinSel[0];
#if (I2C0_PRI > 0 && I2C0_PRI < 17)//1到16,0未用
    VICIntSelect = VICIntSelect & ~(1 << (I2C0_PRI - 1));//设置相应的中断为IRQ中断
    addrOffset = (I2C0_PRI - 1) * 4;
    *(volatile uint32 *)(VICVectAddrBase + addrOffset) = (uint32)IRQIic0;//设置中断服务程序地址
    *(volatile uint32 *)(VICVectCntlBase + addrOffset) = 0x20 | I2C0_INT;//分配中断
    VICIntEnable  = 1 << I2C0_INT;  //使能中断
#endif

    I2C0SCLH = Fpclk / 160000;
    I2C0SCLL = Fpclk / 160000;
    return (1);
}

void RTCWrite(uint8 ad,uint8 da)
{
    IIC_Start();
    IIC_Wait();

    I2C0DAT = 0xA0;
    IIC_WriteData();
    IIC_Wait();
    I2C0DAT = ad;
    IIC_WriteData();
    IIC_Wait();
    I2C0DAT = da;
    IIC_WriteData();
    IIC_Wait();
    IIC_Stop();
}

uint8 RTCRead(uint8 ad)
{
         uint8 data;
         IIC_Start();
    IIC_Wait();
    I2C0DAT = 0xA0;
    IIC_WriteData();
    IIC_Wait();
    I2C0DAT = ad;
    IIC_WriteData();
    IIC_Wait();

    IIC_RepStart();
    IIC_Wait();
    I2C0DAT = 0xA1;
    IIC_WriteData();
    IIC_Wait();
    IIC_ReadNack();
    IIC_Wait();
    data = I2C0DAT;
    IIC_Stop();
    return data;
}

只看该作者 · 2007-4-28 08:12

#define I2C0_PRI 0//没有使用I2C中断方式

lpc2138的I2C查询方式对24lc02的读写

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