ch7013.c

ch7013驱动

#include "config.h"
#include "gpio.h"
#include "ch7013.h"

/*
要求模拟I2C的GPIO是双向的，并且输出都有上拉电阻。
*/
static GPIOPortBit SerialData,SerialClock;

void I2C_INIT()
{  
   SerialData.Port=PortG;
   SerialData.Bit=3;
   
   SerialClock.Port=PortG;
   SerialClock.Bit=2;
   
   GPIO_INIT(&SerialData,0);
   GPIO_INIT(&SerialClock,0);
   I2C_STOP();
}


U8  GetSCL()
{ return GPIO_Read(&SerialClock);
}


U8 GetSDA()
{ return GPIO_Read(&SerialData);
}

void SetSCL(U8 level)
{ 
  GPIO_Write(&SerialClock,(int)level);
}

void SetSDA(U8 level)
{ /*首先将GPIO设为输出,然后再改为输出电平*/
   GPIO_INIT(&SerialData,0);
   GPIO_Write(&SerialData,(int)level);
}

void ReleaseSDA()
{ //注：因为SDA是由GPIO模拟的，GPIO方向改变时可能会引起引脚电平的改变。
  //因此SDA的I/O方向,必须在SCL低电平期间改变
  /*将SDA转为输入，引脚自动上拉*/
   GPIO_INIT(&SerialData,1);
}

void IIC_Delay()
{  int i;
   for (i = 0; i < 6000; i++);
} 



void I2C_START()
{ 
  SetSCL(0);
  IIC_Delay();
  
  SetSDA(1);
  IIC_Delay();
  
  SetSCL(1);
  IIC_Delay();
  
  SetSDA(0); 
  IIC_Delay(); 
}

void I2C_STOP()
{ 
  SetSCL(0);
  IIC_Delay();
  
  SetSDA(0);
  IIC_Delay();
  IIC_Delay();
  
  SetSCL(1);
  IIC_Delay();
  
  SetSDA(1); 
  IIC_Delay(); 
}

#if 0
BOOL I2C_WriteData(const U8 RegData)
{ 
  int i,j;
  /*send 8bits*/ 
  for (i = 7; i >= 0; i--)
  { SetSCL(0);
    IIC_Delay(); 
     
    SetSDA((RegData>>i)&0x1);
    IIC_Delay();
     
    SetSCL(1);
    IIC_Delay();
  }
  
  /*Read ACK*/      
  SetSCL(0);
  IIC_Delay();
  ReleaseSDA(); // SDA变为输入,外部自动上拉。
  IIC_Delay();
  
  
  SetSCL(1); 
  IIC_Delay();
  

  return !GetSDA();
}
#else
BOOL I2C_WriteData(const U8 RegData)
{ 
  int i,j;
  /*send 8bits*/ 
  GPIO_INIT(&SerialData,0);
  for (i = 7; i >= 0; i--)
  { SetSCL(0);
    IIC_Delay(); 
     
    GPIO_Write(&SerialData,(RegData>>i)&0x1);
    IIC_Delay();
     
    SetSCL(1);
    IIC_Delay();
    IIC_Delay();
    IIC_Delay();
  }
  
  /*Read ACK*/      
  SetSCL(0);
  IIC_Delay();
  ReleaseSDA(); // SDA变为输入,外部自动上拉。
  IIC_Delay();
  
  
  SetSCL(1); 
  IIC_Delay();
  
  return 1;

  //return !GetSDA();
}
#endif


  

U8 I2C_ReadData()
{ int i;
  U8 regData=0;
  /*send 8bits*/ 
  for (i = 7; i >= 0; i--)
  { SetSCL(0);
    ReleaseSDA(); 
    IIC_Delay(); /*wait for slave device prepare data*/
    
    SetSCL(1);
    IIC_Delay();
    regData=(regData<<1)|GetSDA();
  }
  
  /*do ACK*/      
  SetSCL(0); 
  IIC_Delay();
  
  SetSDA(0); 
  IIC_Delay();
  SetSCL(1); 
  IIC_Delay();
  
  return regData; 
}


BOOL CH7013_RegWrite(U8 RegAddr, const U8 RegData)
{  U8 DAB, RAB;

   DAB = (DeviceID<<1) | 0x00;
   RAB = 0x80 | AutoInc | (RegAddr & 0x3F);
   
   I2C_START();
   
   if (!I2C_WriteData(DAB)) return 0; 
   if (!I2C_WriteData(RAB)) return 0;
   
   if (!I2C_WriteData(RegData)) return 0;
   
   I2C_STOP();
}
 


BOOL CH7013_RegRead(U8 RegAddr, U8 *pRegData)
{  U8 DAB_0, DAB_1, RAB;
   DAB_0= (DeviceID<<1) | 0x00; 
   DAB_1= (DeviceID<<1) | 0x01;
   RAB = 0x80 | AutoInc | (RegAddr & 0x3F);
   
   I2C_START();
   
   if (!I2C_WriteData(DAB_0)) return 0; 
   if (!I2C_WriteData(RAB)) return 0;
   
   I2C_START(); /* restart*/
   
   if (!I2C_WriteData(DAB_1)) return 0; 
   *pRegData=I2C_ReadData();
   
   I2C_STOP();
   
   return 1;
}