www.pudn.com > hello_led_0.rar > Open_I2C.c

#include  
#include "system.h" 
#include "Open_I2C.h" 
//------------------------------------------------------------------------- 
unsigned int I2C_Read_Period() 
{ 
  unsigned char low,high; 
  low = IORD(I2C_0_BASE,I2C_PRER_LO); 
  high= IORD(I2C_0_BASE,I2C_PRER_HI); 
  return (high<<16)+low; 
} 
//------------------------------------------------------------------------- 
unsigned char I2C_Read_Ctrl() 
{ 
  return  IORD(I2C_0_BASE,I2C_CTR); 
} 
//------------------------------------------------------------------------- 
unsigned char I2C_Read_RX() 
{ 
  return  IORD(I2C_0_BASE,I2C_RXR); 
} 
//------------------------------------------------------------------------- 
unsigned char I2C_Read_Status() 
{ 
  return  IORD(I2C_0_BASE,I2C_SR); 
} 
//------------------------------------------------------------------------- 
void I2C_Write_Period(unsigned int Period) 
{ 
  IOWR(I2C_0_BASE,I2C_PRER_LO,Period&0xFF); 
  IOWR(I2C_0_BASE,I2C_PRER_HI,Period>>16); 
} 
//------------------------------------------------------------------------- 
void  I2C_Write_Ctrl(unsigned char value) 
{ 
  IOWR(I2C_0_BASE,I2C_CTR,value); 
} 
//------------------------------------------------------------------------- 
void  I2C_Write_TX(unsigned char value) 
{ 
  IOWR(I2C_0_BASE,I2C_TXR,value); 
} 
//------------------------------------------------------------------------- 
void  I2C_Write_CMD(unsigned char value) 
{ 
  IOWR(I2C_0_BASE,I2C_CR,value); 
} 
//------------------------------------------------------------------------- 
void  I2C_Init(unsigned int Period) 
{ 
  I2C_Ctrl_Reg  a; 
  I2C_Write_Period(Period); 
  a.I2C_Ctrl_Flags.CORE_ENABLE=1; 
  a.I2C_Ctrl_Flags.INT_ENABLE=1; 
  a.I2C_Ctrl_Flags.RESERVED=0; 
  I2C_Write_Ctrl(a.Value); 
} 
//------------------------------------------------------------------------- 
unsigned char I2C_Send(unsigned char value,unsigned char STA,unsigned char STO) 
{ 
  unsigned char ACK; 
  I2C_CMD_Reg     I2C_CMD; 
  I2C_Status_Reg  I2C_Status; 
  I2C_Write_TX(value); 
  I2C_CMD.Value=0; 
  if(STA!=0) 
  I2C_CMD.I2C_CMD_Flags.STA=1; 
  if(STO!=0) 
  I2C_CMD.I2C_CMD_Flags.STO=1; 
  I2C_CMD.I2C_CMD_Flags.WR=1; 
  I2C_Write_CMD(I2C_CMD.Value); 
  do 
  { 
    I2C_Status.Value=I2C_Read_Status(); 
  } 
  while(I2C_Status.I2C_Status_Flags.TIP); 
  if(!I2C_Status.I2C_Status_Flags.RXACK) 
  ACK=1; 
  else 
  ACK=0; 
  return ACK; 
} 
//-------------------------------------------------------------------------