CHJ/user/Device/MCP9808.c

#include "../main/SystemInclude.h"

/* File start *****************************************************************/
#if ENABLE_USE_MCP9808
/******************************************************************************/

/******************************************************************************/
void WriteWordRegister(u8 regBuf, u16 regData)
{
   SI2C_Start();                        // send START command
   SI2C_Write(MCP_ADR);                 // WRITE Command (see Section 4.1.4 <20><>Address Byte<74><65>)
                                        // also, make sure bit 0 is cleared <20><>0<EFBFBD><30>
   SI2C_Write(regBuf);                  // Write CONFIG Register
   SI2C_Write(regData>>8);              // Write data
   SI2C_Write(regData);                 // Write data
   SI2C_Stop();                         // send STOP command
}

/******************************************************************************/
u16 ReadWordRegister(u8 regBuf)
{
   TypeWord tempInt;
   
   SI2C_Start();                        // send START command
   SI2C_Write(MCP_ADR);                 // WRITE Command (see Section 4.1.4 <20><>Address Byte<74><65>)
                                        // also, make sure bit 0 is cleared <20><>0<EFBFBD><30>
   SI2C_Write(regBuf);                  // Write CONFIG Register
   
   SI2C_Start();                        // send Repeat START command
   SI2C_Write(MCP_ADR | 0x01);          // READ Command
                                        // also, make sure bit 0 is set <20><>1<EFBFBD><31>
   tempInt.Byte[1] = SI2C_Read();       // READ 8 bits
   SI2C_Ack();
   tempInt.Byte[0] = SI2C_Read();       // READ 8 bits
   SI2C_NoAck();
   SI2C_Stop();                         // send STOP command
   
   return tempInt.Word;   
}

/******************************************************************************/
void WriteByteRegister(u8 regBuf, u8 regData)
{
   SI2C_Start();                        // send START command
   SI2C_Write(MCP_ADR);                 // WRITE Command (see Section 4.1.4 <20><>Address Byte<74><65>)
                                        // also, make sure bit 0 is cleared <20><>0<EFBFBD><30>
   SI2C_Write(regBuf);                  // Write CONFIG Register
   SI2C_Write(regData);                 // Write data
   SI2C_Stop();                         // send STOP command
}

/******************************************************************************/
u16 ReadByteRegister(u8 regBuf)
{
   u8 temp;

   SI2C_Start();                        // send START command
   SI2C_Write(MCP_ADR);                 // WRITE Command (see Section 4.1.4 <20><>Address Byte<74><65>)
                                        // also, make sure bit 0 is cleared <20><>0<EFBFBD><30>
   SI2C_Write(regBuf);                  // Write CONFIG Register
   
   SI2C_Start();                        // send Repeat START command
   SI2C_Write(MCP_ADR | 0x01);          // READ Command
                                        // also, make sure bit 0 is set <20><>1<EFBFBD><31>
   temp = SI2C_Read();                  // READ 8 bits
   SI2C_NoAck();
   SI2C_Stop();                         // send STOP command
   
   return temp;   
}

/******************************************************************************/
void TestTemperatureInit(u8 regValue)
{
  WriteWordRegister(CONFIG, CONVERSION);
  //WriteByteRegister(RREG, RESULT_0_125_BIT);
  WriteByteRegister(RREG, regValue);
  HWState.EnableTempInit = 0;
}

/******************************************************************************/
s16 TestTemperature(void)
{
  u32 tempLongInt;
	s16 tempTA;
  
  tempTA  = (u32)ReadWordRegister(TA);
  tempTA &= 0x1fff;
  tempLongInt  = (u32)(tempTA & 0xFFF);
  if(tempTA >= 0x1000) tempLongInt = 0xFFF - tempLongInt;
  tempLongInt  = (tempLongInt * 6400) >> 10;                // 0.0625*1024*100 /1024
	
	if(tempTA >= 0x1000){
     tempTA *= -1;
	}
	else  tempTA = (u16)tempLongInt;                                // Temperature*100
  if(voltageDetected[TPCB] >= 0x1000) tempTA *= -1;
  
  return tempTA;
}

/******************************************************************************/
void TemperatureLowPower(void)
{
  WriteWordRegister(CONFIG, SHUT_DOWN);
}

/* File end *****************************************************************/
#endif 
/****************************************************************************/