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#ifndef __I2C_EE_C
#define __I2C_EE_C
#endif
#include "i2c_ee.h"
/********************************************************************************
* 使用I2C1讀寫AT24C256，LM75
*******************************************************************************/
//u16 test=0x00e7;
void I2C_delay(void)
{
u8 i=50; //這里可以優(yōu)化速度，經(jīng)測試最低到5還能寫入
while(i--);
}
u16 I2C_Start(void)
{
SDA_H;
SCL_H;
I2C_delay();
if(!SDA_read)return(I2C_TM_ERR); //SDA線為低電平則總線忙,退出
SDA_L;
I2C_delay();
if(SDA_read) return(I2C_TM_ERR); //SDA線為高電平則總線出錯,退出
SCL_L;
I2C_delay();
return (I2C_TM_OK);
}
void I2C_Stop(void)
{
SCL_L;
I2C_delay();
SDA_L;
I2C_delay();
SCL_H;
I2C_delay();
SDA_H;
I2C_delay();
SCL_L;
I2C_delay();
}
void I2C_Ack(void)
{
SCL_L;
I2C_delay();
SDA_L;
I2C_delay();
SCL_H;
I2C_delay();
SCL_L;
I2C_delay();
}
void I2C_NoAck(void)
{
SCL_L;
I2C_delay();
SDA_H;
I2C_delay();
SCL_H;
I2C_delay();
SCL_L;
I2C_delay();
}
u16 I2C_WaitAck(void) //返回為:=1有ACK,=0無ACK
{
SCL_L;
I2C_delay();
SDA_H;
I2C_delay();
SCL_H;
I2C_delay();
if(SDA_read)
{
SCL_L;
return(I2C_TM_ERR);
}
SCL_L;
return(I2C_TM_OK);
}
void I2C_SendByte(u8 SendByte) //數(shù)據(jù)從高位到低位//
{
u8 i=8;
while(i--)
{
SCL_L;
I2C_delay();
if(SendByte&0x80)SDA_H;
else SDA_L;
SendByte<<=1;
I2C_delay();
SCL_H;
I2C_delay();
}
SCL_L;
}
u8 I2C_ReceiveByte(void) //數(shù)據(jù)從高位到低位//
{
u8 i=8;
u8 ReceiveByte=0;
SDA_H;
while(i--)
{
ReceiveByte<<=1;
SCL_L;
I2C_delay();
SCL_H;
I2C_delay();
if(SDA_read)
{
ReceiveByte|=0x01;
}
}
SCL_L;
return ReceiveByte;
}
/*******************************************************************************
* Function Name : I2C_EE_ByteWrite
* Description : Writes one byte to the I2C EEPROM.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROM's internal address to write to.
* Output : None
* Return : None
*******************************************************************************/
u16 I2C_EE_ByteWrite(u8* pBuffer, u16 WriteAddr)
{
if(I2C_Start()==I2C_TM_ERR)return(I2C_TM_ERR);
I2C_SendByte(EEPROM_ADDRESS); //設(shè)置器件地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte((WriteAddr>>8) & 0x00FF); //設(shè)置高起始地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte((u8)(WriteAddr & 0x00FF)); //設(shè)置低起始地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte(*pBuffer);
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_Stop();
//注意：因為這里要等待EEPROM寫完，可以采用查詢或延時方式(10ms)
if(I2C_EE_WaitEepromStandbyState()==I2C_TM_ERR) return(I2C_TM_ERR);
return (I2C_TM_OK);
}
/*******************************************************************************
* Function Name : I2C_EE_PageWrite
* Description : Writes more than one byte to the EEPROM with a single WRITE
* cycle. The number of byte can't exceed the EEPROM page size.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROM's internal address to write to.
* - NumByteToWrite : number of bytes to write to the EEPROM.
* Output : None
* Return : None
*******************************************************************************/
u16 I2C_EE_PageWrite(u8* pBuffer, u16 WriteAddr, u16 NumByteToWrite)
{
if(I2C_Start()==I2C_TM_ERR)return I2C_TM_ERR;
I2C_SendByte(EEPROM_ADDRESS); //設(shè)置器件地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte((WriteAddr>>8) & 0x00FF); //設(shè)置高起始地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte((u8)(WriteAddr & 0x00FF)); //設(shè)置低起始地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
while(NumByteToWrite--)
{
I2C_SendByte(* pBuffer);
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
pBuffer++;
}
I2C_Stop();
//注意：因為這里要等待EEPROM寫完，可以采用查詢或延時方式(10ms)
//Systick_Delay_1ms(10);
if(I2C_EE_WaitEepromStandbyState()==I2C_TM_ERR) return(I2C_TM_ERR);
return(I2C_TM_OK);
}
/*******************************************************************************
* Function Name : I2C_EE_BufferWrite
* Description : Writes buffer of data to the I2C EEPROM.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROM's internal address to write to.
* - NumByteToWrite : number of bytes to write to the EEPROM.
* Output : None
* Return : None
*******************************************************************************/
u16 I2C_EE_BufferWrite(u8* pBuffer, u16 WriteAddr, u16 NumByteToWrite)
{
u16 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;
Addr = WriteAddr % I2C_PageSize;
count = I2C_PageSize - Addr;
NumOfPage = NumByteToWrite / I2C_PageSize;
NumOfSingle = NumByteToWrite % I2C_PageSize;
/* If WriteAddr is I2C_PageSize aligned */
if(Addr == 0)
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage == 0)
{
if(I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle)==I2C_TM_ERR) return(I2C_TM_ERR);
}
/* If NumByteToWrite > I2C_PageSize */
else
{
while(NumOfPage--)
{
if(I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize)==I2C_TM_ERR) return(I2C_TM_ERR);
WriteAddr += I2C_PageSize;
pBuffer += I2C_PageSize;
}
if(NumOfSingle!=0)
{
if(I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle)==I2C_TM_ERR) return(I2C_TM_ERR);
}
}
}
/* If WriteAddr is not I2C_PageSize aligned */
else
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage== 0)
{
if(I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle)==I2C_TM_ERR) return(I2C_TM_ERR);
}
/* If NumByteToWrite > I2C_PageSize */
else
{
NumByteToWrite -= count;
NumOfPage = NumByteToWrite / I2C_PageSize;
NumOfSingle = NumByteToWrite % I2C_PageSize;
if(count != 0)
{
if(I2C_EE_PageWrite(pBuffer, WriteAddr, count)==I2C_TM_ERR) return(I2C_TM_ERR);
WriteAddr += count;
pBuffer += count;
}
while(NumOfPage--)
{
if(I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize)==I2C_TM_ERR) return(I2C_TM_ERR);
WriteAddr += I2C_PageSize;
pBuffer += I2C_PageSize;
}
if(NumOfSingle != 0)
{
if(I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle)==I2C_TM_ERR) return(I2C_TM_ERR);
}
}
}
return(I2C_TM_OK);
}
/*******************************************************************************
* Function Name : I2C_EE_BufferRead
* Description : Reads a block of data from the EEPROM.
* Input : - pBuffer : pointer to the buffer that receives the data read
* from the EEPROM.
* - ReadAddr : EEPROM's internal address to read from.
* - NumByteToRead : number of bytes to read from the EEPROM.
* Output : None
* Return : None
*******************************************************************************/
u16 I2C_EE_BufferRead(u8* pBuffer, u16 ReadAddr, u16 NumByteToRead)
{
if(I2C_Start()==I2C_TM_ERR)return(I2C_TM_ERR);
I2C_SendByte(EEPROM_ADDRESS); //設(shè)置器件地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte((ReadAddr>>8) & 0x00FF); //設(shè)置高起始地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte((u8)(ReadAddr & 0x00FF)); //設(shè)置低起始地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
if(I2C_Start()==I2C_TM_ERR)return(I2C_TM_ERR);
I2C_SendByte(EEPROM_ADDRESS | 0x0001);
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
while(NumByteToRead)
{
*pBuffer = I2C_ReceiveByte();
if(NumByteToRead == 1)I2C_NoAck();
else I2C_Ack();
pBuffer++;
NumByteToRead--;
}
I2C_Stop();
return(I2C_TM_OK);
}
/*******************************************************************************
* Function Name : I2C_EE_WaitEepromStandbyState
* Description : Wait for EEPROM Standby state
* Input : None
* Output : None
* Return : None
*******************************************************************************/
u16 I2C_EE_WaitEepromStandbyState(void)
{
u32 tmout=I2C_TIMEOUT;
do
{
if(I2C_Start()==I2C_TM_ERR)return I2C_TM_ERR;
I2C_SendByte(EEPROM_ADDRESS); //設(shè)置器件地址
if(I2C_WaitAck()==I2C_TM_OK){I2C_Stop(); return(I2C_TM_OK);}
tmout--;
}while(tmout>0);
//停止位
I2C_Stop();
return(I2C_TM_ERR);
}
/*******************************************************************************
* Function Name : I2C_LM75_Read
* Description : Reads Temperature data from the LM75.
* Input : None
* Output : 0xFFFF -- Error
* 0x0000 ~ 0x01FF -- Valid data
* Temp Binary Hex
* +125 0111 1101 0xxx xxxx 0FAh
* +25 0001 1001 0xxx xxxx 032h
* +0.5 0000 0000 1xxx xxxx 001h
* 0 0000 0000 0xxx xxxx 000h
* -0.5 1111 1111 1xxx xxxx 1FFh
* -25 1110 0111 0xxx xxxx 1CEh
* -55 1100 1001 0xxx xxxx 192h
* Return : None
*******************************************************************************/
u16 I2C_LM75_Read(void)
{
vu16 TempH,TempL;
if(I2C_Start()==I2C_TM_ERR)return(I2C_TM_ERR);
I2C_SendByte(LM75_ADDRESS); //設(shè)置器件地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
I2C_SendByte(0x00); //設(shè)置溫度寄存器地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
if(I2C_Start()==I2C_TM_ERR)return(I2C_TM_ERR);
I2C_SendByte(LM75_ADDRESS | 0x01); //設(shè)置器件地址
if(I2C_WaitAck()==I2C_TM_ERR){I2C_Stop(); return(I2C_TM_ERR);}
TempH = I2C_ReceiveByte();
I2C_Ack();
TempL = I2C_ReceiveByte();
I2C_NoAck();
I2C_Stop();
// if(TempH==0xFF && TempL==0xFF) return I2C_TM_ERR;
// TempH = (TempH<<8) | (TempL&0x80);
// TempH = test;
return(TempH);
}

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