Microchip Taiwan - 请教16F876写EEPROM的问题 [8-bit PIC® MCU]

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shiyong

请教16F876写EEPROM的问题

新會員

我在准程序中调用了
unsigned char I2C_Byte_Read(unsigned char AddH,unsigned char AddL);
void I2C_Byte_Write(unsigned char AddH,unsigned char AddL,unsigned char WriteByte);

Main程序中这么写的
I2C_Byte_Write(0x00,0x00,11);
I2C_Byte_Write(0x00,0x02,99);
I2C_Byte_Write(0x00,0x04,99);
m_Values[7]=I2C_CurrentByte_Read();
m_Values[1]=I2C_Byte_Read(0x00,0x00);
m_Values[2]=I2C_Byte_Read(0x00,0x04);

利用ICD2仿真器看看m_Values一直是零，但是发送好像是能够收到应答的，我查看了I2C_Error1，I2C_Error2，I2C_Error3都一直是零吧中断是没有写进去还是没有读出来。不知道问题出在哪里。请大家帮我看看，谢谢
#ifndef E2prom_h
#define E2prom_h
//#include <pic168xa.h>
#include <pic.h>

#define D_SCL TRISC3 //SCL方向控制
#define D_SDA TRISC4 //SDA方向控制
#define SCL RC3
#define SDA RC4
#define WriteCommand 0xA0 //写命令字
#define ReadCommand 0xA1 //读命令字
char Ack_Temp=0; //用于检测应答，为0有应答，1无应答

char I2C_Error1=0;//0无通讯错误，1有通讯错误
char I2C_Error2=0;
char I2C_Error3=0;
char I2C_Error=0;

void Delays(unsigned char Time_delay);
void I2C_Delay(unsigned char Time_delay);
void I2C_Init(void);
void I2C_Start(void);
void I2C_Stop(void);
void I2C_AckOut(void);
void I2C_NAckOut(void);
void I2C_AckRec();
void I2C_OneByteOut(unsigned char OneByte) ;
unsigned char I2C_OneByteIn(void);
//unsigned char I2C_ReadOneByte();
//unsigned int I2C_ReadOneWord();
void I2C_WriteAddress(unsigned char cmd,unsigned char addh,unsigned char addl);
void I2C_Byte_Write(unsigned char AddH,unsigned char AddL,unsigned char WriteByte);

void I2C_Word_Write(unsigned char AddH,unsigned char AddL,unsigned char DataH,unsigned char DataL);
void I2C_Page_Write(unsigned char AddH,unsigned char AddL,unsigned char Datanum,unsigned char *P_Data);
unsigned char I2C_CurrentByte_Read();
unsigned char I2C_Byte_Read(unsigned char AddH,unsigned char AddL);
unsigned int I2C_Word_Read(unsigned char AddH,unsigned char AddL);
void I2C_Page_Read(unsigned char AddH,unsigned char AddL,unsigned char Datanum,unsigned char *P_Data);
void I2C_WriteAll();

/*----------------------------------------------------------
长延时程序
Time_delay=1时延时250us
-----------------------------------------------------------*/
void Delays(unsigned char Time_delay)
{
unsigned char i,j;
for(i=0;i<=Time_delay-1;i++)
{for(j=0;j<0xfd;j++)asm("nop");}
}

/*--------------------------------------------------------
I2C总线延时程序
---------------------------------------------------------*/
void I2C_Delay(unsigned char Time_delay)
{
unsigned char i;
for(i=0;i<=Time_delay;i++)
asm("nop");
}

/*--------------------------------------------------------
E2prom初始化设置
---------------------------------------------------------*/
void I2C_Init(void)
{
D_SCL=0;
D_SDA=0;
SDA=1;
SCL=1;
}

/*---------------------------------------------------------
在I2C总线上产生起始信号
----------------------------------------------------------*/
void I2C_Start(void)
{
D_SCL=0;
D_SDA=0;
SCL=0;
I2C_Delay(8);
SDA=1; //SCL SDA为高电平
SCL=1;
I2C_Delay(8);
SDA=0; //SCL高时，SDA由1变0产生起始位
I2C_Delay(3);
SCL=0;
I2C_Delay(8);
}

/*---------------------------------------------------------
在I2C总线上产生停止信号
----------------------------------------------------------*/
void I2C_Stop(void)
{
D_SCL=0;
D_SDA=0;
SCL=0;
I2C_Delay(8);
SDA=0; //确保SDA=0
SCL=1; //确保SCL=1
I2C_Delay(8);
SDA=1; //SCL=1时，SDA有0变1产生停止位
SCL=0;
I2C_Delay(8);
}
/*---------------------------------------------------------
在I2C总线上产生应答信号
----------------------------------------------------------*/
void I2C_AckOut(void)
{
D_SCL=0;
D_SDA=0;
SCL=0;
I2C_Delay(8);
SDA=0; //SDA=0
I2C_Delay(3);
SCL=1; //产生时钟上升沿，产生应答
I2C_Delay(10); //准备发送应答
SCL=0;
I2C_Delay(8);
// SDA=1;
I2C_Delay(8);
}

/*---------------------------------------------------------
在I2C总线上产生非应答信号
----------------------------------------------------------*/
void I2C_NAckOut(void)
{
D_SCL=0;
D_SDA=0;
SCL=0;
I2C_Delay(8);
SDA=1; //SDA=1
I2C_Delay(8);
SCL=1; //SCL=1产生时钟上升沿
I2C_Delay(8); //发送非应答
SCL=0; //时钟结束
I2C_Delay(8);
// SDA=1;
// I2C_Delay(8);
}

/*----------------------------------------------------
从总线上接受应答信号，存放到Ack_Temp中
-----------------------------------------------------*/
void I2C_AckRec()
{
//SCL=0;I2C_Delay(8);
//SCL-1;I2C_Delay(8);
//SCL=0;I2C_Delay(8);
Ack_Temp=1;
D_SCL=0;
D_SDA=1;
SDA=1; //SDA置高，准备接受应答
//I2C_Delay(8);
SCL=1;
//Ack_Temp=SDA;
if(SDA)Ack_Temp=1;
else Ack_Temp=0;
I2C_Delay(3);
SCL=0; //
I2C_Delay(6);
}

/*--------------------------------------------------
向E2PROM写一个字节
入口参数：OneByte是要写入的数
---------------------------------------------------*/
void I2C_OneByteOut(unsigned char OneByte)
{
unsigned char i;
D_SCL=0;
D_SDA=0;

SCL=0;
I2C_Delay(8);
for(i=0;i<8;i++)
{
if(OneByte&0x80==0x80)SDA=1;
else SDA=0;
// I2C_Delay(10);
SCL=1;
I2C_Delay(10);
OneByte=OneByte<<1;
SCL=0;
//SDA=0;
}
I2C_AckRec(); //接收从器件应答信号
}

/*---------------------------------------------------
从E2PROM读取一个字节数据
函数返回值：OneByte是从E2PROM读取的字节
----------------------------------------------------*/
unsigned char I2C_OneByteIn()
{
unsigned char i, OneByte;
D_SDA=1;
SCL=0;
OneByte=0;
for(i=0;i<=7;i++)
{
SDA = 1;
OneByte<<=1; //左移一位
SCL=1;
I2C_Delay(5);
if(SDA) OneByte|=0x01;
else OneByte=OneByte&0xfe;
I2C_Delay(5);asm("nop");
SCL=0;
I2C_Delay(5);
} //从i2c总线上读取字数据的高位字节
//D_SDA=0;
return(OneByte);
}

/*---------------------------------------------------
向E2prom写地址高字节和地址低字节
入口参数：Cmd控制命令字
AddH,AddL分别是地址高八位好低八位
----------------------------------------------------*/
void I2C_WriteAddress(unsigned char Cmd,unsigned char AddH,unsigned char AddL)
{
I2C_Start();
I2C_OneByteOut(Cmd);
I2C_AckRec();
if(Ack_Temp==1)
{I2C_Error1=1; return;}

I2C_OneByteOut(AddH);
if(Ack_Temp==1)
{
I2C_Error2=1; return;}
I2C_OneByteOut(AddL);
if(Ack_Temp==1)
{
I2C_Error3=1; return;}
}

/*---------------------------------------------------
向E2prom写一个字节，并产生停止位
入口参数：WriteByte 要写入的字节
AddH,AddL要写入的E2PROM的高低地址
----------------------------------------------------*/
void I2C_Byte_Write(unsigned char AddH,unsigned char AddL,unsigned char WriteByte)
{
I2C_WriteAddress(WriteCommand,AddH,AddL);
/*I2C_OneByteOut(WriteCommand);
I2C_Delay(8);
I2C_OneByteOut(AddH);
I2C_Delay(8);
I2C_OneByteOut(AddL);
I2C_Delay(8); */
I2C_OneByteOut(WriteByte);
if(Ack_Temp==1)
{
I2C_Error=1; return;}
I2C_Stop();
}

/*---------------------------------------------------
向E2prom写一个字，并产生停止位
入口参数：DataH 要写入字的高字节
DataL 要写入字的低字节
----------------------------------------------------*/
void I2C_Word_Write(unsigned char AddH,unsigned char AddL,unsigned char DataH,unsigned char DataL)
{
I2C_WriteAddress(WriteCommand,AddH,AddL);
I2C_OneByteOut(DataH); //送高字节
I2C_OneByteOut(DataL); //送低字节
I2C_Stop();
}

/*---------------------------------------------------
向E2prom连续写一组数，（即按页写入）
入口参数：AddH，AddL 起始地址的高位和低位
Datanum 一次写入的字节数
*P_Data指向存放被写入的数据数组的指针
----------------------------------------------------*/
void I2C_Page_Write(unsigned char AddH,unsigned char AddL,unsigned char Datanum,unsigned char *P_Data)
{
unsigned char i;
I2C_WriteAddress(WriteCommand,AddH,AddL);
for (i=0;i<Datanum;i++)
{
I2C_OneByteOut(*(P_Data+i));
}
I2C_Stop();
Delays(0x0f); //延时

}
void I2C_WriteAll()
{
unsigned int i,j;
unsigned char k;
I2C_WriteAddress(WriteCommand,0x00,0x00);
for (i=0;i<1024;i++)
{
if(k==0)k=1;
else if(k!=0)k=0;
for(j=0;j<256;j++)
{I2C_OneByteOut(11);
I2C_Delay(8);
I2C_OneByteOut(22);RA5=k; }
}
I2C_Stop();
Delays(0x0f); //延时
}
/*--------------------------------------------------------
---------------------------------------------------------*/
unsigned char I2C_CurrentByte_Read()
{
unsigned char CurrentByte;
I2C_Start();
I2C_OneByteOut(ReadCommand);
CurrentByte= I2C_OneByteIn();
I2C_Delay(5);
I2C_NAckOut();
I2C_Stop();
return(CurrentByte);
}
/*-------------------------------------------------------
从E2PROM读取一个字节
入口参数：AddH，AddL是读取数据存放地址的高位好低位
函数返回值：从E2PROM读取的字节数据 ReadByte
--------------------------------------------------------*/
unsigned char I2C_Byte_Read(unsigned char AddH,unsigned char AddL)
{
unsigned char ReadByte;
I2C_WriteAddress(WriteCommand,AddH,AddL);
I2C_Start();
I2C_OneByteOut(ReadCommand) ;
//I2C_AckOut();
ReadByte= I2C_OneByteIn();
I2C_Delay(5);
I2C_NAckOut();
I2C_Stop();
Delays(0xff); //延时
return(ReadByte);
}
/*-------------------------------------------------------
从E2PROM读取一个字节
入口参数：AddH，AddL是读取数据存放地址的高位好低位
函数返回值：从E2PROM读取的字节数据 ReadByte
--------------------------------------------------------*/
unsigned int I2C_Word_Read(unsigned char AddH,unsigned char AddL)
{
unsigned char ReadWord;
I2C_WriteAddress(WriteCommand,AddH,AddL);
I2C_Start();
I2C_OneByteOut(ReadCommand);

ReadWord= I2C_OneByteIn();
I2C_AckOut();
ReadWord=ReadWord<<8;
I2C_Delay(8);
ReadWord=ReadWord+I2C_OneByteIn();
I2C_NAckOut();
I2C_Stop();
Delays(0xff); //延时
return(ReadWord);
}
/*--------------------------------------------------------------
向E2prom连续读取一组数，（即按页读）
入口参数：AddH，AddL 起始地址的高位和低位
Datanum 一次读出的字节数
*P_Data指向存放读出的数据数组的指针
---------------------------------------------------------------*/
void I2C_Page_Read(unsigned char AddH,unsigned char AddL,unsigned char Datanum,unsigned char *P_Data)
{
unsigned char i;
I2C_WriteAddress(WriteCommand,AddH,AddL);
I2C_Start();
I2C_OneByteOut(ReadCommand);
for(i=0;i<Datanum;i++)
{
*(P_Data+i)=I2C_OneByteIn();
if(i==Datanum) I2C_NAckOut();
else I2C_AckOut();
}
I2C_Stop();
Delays(0xff); //延时
Delays(0xff); //延时
}

#endif

發表於: 2009/3/15 17:43