IIC协议

只看该作者 · 2016-9-8 10:35

请问为什么只有0x06，0x02，0x04三个寄存器不能进行写操作。求指点迷津！
程序如下：
#include "IIC_Master.h"

static void delay()
{
delay_us(10);
}

void IIC_Init(void)
{
BIT_OUT(IIC_SDA);
BIT_OUT(IIC_SCL);
SET_BIT(IIC_SDA);
SET_BIT(IIC_SCL);
}

void IIC_Start(void)
{
SET_BIT(IIC_SCL);
delay();
CLR_BIT(IIC_SDA);
delay();
}

void IIC_Stop(void)
{
CLR_BIT(IIC_SDA);
delay();
SET_BIT(IIC_SCL);
delay();
SET_BIT(IIC_SDA);
delay();
}

void IIC_WriteByte(INT8U data)
{
CLR_BIT(IIC_SCL);
delay();
for(int i = 0; i < 8; ++i)
{
   if(data & 0x80)
   {
      SET_BIT(IIC_SDA);
   }
   else
   {
      CLR_BIT(IIC_SDA);
   }
   data = data << 1;
   delay();
   SET_BIT(IIC_SCL);
   delay();
   CLR_BIT(IIC_SCL);
   delay();
}
}

INT8U IIC_ReadByte(void)
{
INT8U data=0;
CLR_BIT(IIC_SCL);
BIT_IN(IIC_SDA);
delay();
for(int i = 0; i < 8; ++i)
{
      data = data << 1;
      SET_BIT(IIC_SCL);
      delay();
      if(TEST_BIT(IIC_SDA))
      {
         data |= 0x01;
      }
      CLR_BIT(IIC_SCL);
      delay();
}
BIT_OUT(IIC_SDA);
return data;
}

INT8U IIC_ReadAck()
{
INT8U ACK=0;
CLR_BIT(IIC_SCL);
BIT_IN(IIC_SDA);
delay();
SET_BIT(IIC_SCL);
delay();

ACK = TEST_BIT(IIC_SDA);

CLR_BIT(IIC_SCL);
delay();
BIT_OUT(IIC_SDA);
return ACK;
}

void IIC_SendAck(INT8U ACK)
{
CLR_BIT(IIC_SCL);
delay();
if(ACK)
{
      SET_BIT(IIC_SDA);
}
else
{
      CLR_BIT(IIC_SDA);
}
delay();
SET_BIT(IIC_SCL);
delay();
CLR_BIT(IIC_SCL);
delay();
}

INT8U IIC_WriteOneByteRegister(INT8U DeviceAddr,
                           INT8U RegisterAddr,
                           INT8U RegisterData)
{
INT8U ACK=0;
IIC_Start();
IIC_WriteByte(DeviceAddr << 1); //设备地址
ACK += IIC_ReadAck();

IIC_WriteByte(RegisterAddr);    //寄存器地址
ACK += IIC_ReadAck();

IIC_WriteByte(RegisterData);
ACK += IIC_ReadAck();
IIC_Stop();
return ACK;
}

INT8U IIC_ReadOneByteRegister(INT8U DeviceAddr,INT8U RegisterAddr)
{
INT8U data=0;
INT8U ACK=0;
INT8U Addr=DeviceAddr << 1;

IIC_Start();
IIC_WriteByte(Addr);
ACK += IIC_ReadAck();

IIC_WriteByte(RegisterAddr);
ACK += IIC_ReadAck();

IIC_Start();
IIC_WriteByte(Addr + 1);
ACK += IIC_ReadAck();

data = IIC_ReadByte();
IIC_SendAck(IIC_NACK);

IIC_Stop();
return data;
}

void IIC_ReadMulByteRegister(INT8U DeviceAddr,INT8U RegisterAddr,INT8U * Reg_data)  //读取FIFO寄存器中的数据
{
INT8U m,n,i,l,ACK=0;
INT8U Addr=DeviceAddr << 1;

m=IIC_ReadOneByteRegister(0x57,0x02);  //读取写指针
n=IIC_ReadOneByteRegister(0x57,0x04);  //读取读指针

IIC_Start();
IIC_WriteByte(Addr);
ACK += IIC_ReadAck();

IIC_WriteByte(RegisterAddr);
ACK += IIC_ReadAck();

IIC_Start();
IIC_WriteByte(Addr + 1);
ACK += IIC_ReadAck();

for(l=0;l<m-n;l++)
{
for(i=0;i<4;i++)
   {
   Reg_data[i] = IIC_ReadByte();
   if(i==3)
      IIC_SendAck(IIC_NACK);
   else
      IIC_SendAck(IIC_ACK);
   }
}
IIC_Stop();
IIC_Start(); //重新写入读指针
IIC_WriteByte(Addr + 1);
IIC_WriteByte(0x04);
IIC_WriteByte(0x00);
IIC_Stop();
}