瑞萨单片机写EEPROM问题

只看该作者 · 2015-1-5 16:09

单片机写24LC256，如想在地址0x300写入0x01,在地址0x301写入0x28。当调用IIC的读函数时，0x01可以读出来，0x28没有读出来。小弟认为IIC的读函数没有问题，写函数有问题，查了半天，没搞明白哪地方出错了，来论坛发帖求救

只看该作者 · 2015-1-5 16:09

void IIC_Start(void)
{
SDA_Output();
SDA=1;
NOP();
SCL=1;
NOP();
SDA=0;
NOP();
}
/***************停止信号**************/
void IIC_Stop(void)
{
SDA_Output();
SDA=0;
NOP();
SCL=1;
NOP();
SDA=1;
NOP();
}
/***********等待应答信号***********/
void IIC_Responsion(void)
{
unsigned char i;
SDA_Input();
SCL=1;
NOP();

while((SDA==1)&&(i<250))i++;
SCL=0;
NOP();
}
/************写一个字节************/
void IIC_Write_byte(unsigned char date)
{
unsigned char i,temp;
SDA_Output();
temp=date;
for(i=0;i<8;i++)
{
    SCL=0;
NOP();
if(temp&0x80)
{
SDA = 1;
}
else
{
SDA = 0;
}
temp=temp<<1;
NOP();
    SCL=1;
NOP();
}
SCL=0;
NOP();
SDA=1;
NOP();
}
/************读一个字节************/
unsigned char IIC_Read_byte(void)
{
unsigned char i,temp;

SDA=1;
SDA_Input();
delay_ms(2);
NOP();
for(i=0;i<8;i++)
{
    SCL=0;
NOP();NOP();NOP();
temp=(temp<<1)|SDA;
SCL=1;
NOP();NOP();NOP();
}
SCL=0;
NOP();
return temp;
}
/*********对任意地址写数据*********/
void IIC_Write_add(unsigned int address,unsigned char date)
{

IIC_Start();
IIC_Write_byte(Device_Adress);
IIC_Responsion();
IIC_Write_byte((address>>8)&0xff);
IIC_Responsion();
IIC_Write_byte( address&0xff);
IIC_Responsion();
IIC_Write_byte(date);
IIC_Responsion();
IIC_Stop();
}
/*********对任意地址读数据*********/
unsigned char IIC_Read_add(unsigned int address)
{
unsigned char date;
// In_Put Mode
IIC_Start();
IIC_Write_byte(Device_Adress);
IIC_Responsion();
IIC_Write_byte((address>>8)&0xff);
IIC_Responsion();
IIC_Write_byte( address&0xff);
IIC_Responsion();
IIC_Start();
IIC_Write_byte(Device_Adress|Read_Single);
IIC_Responsion();
date=IIC_Read_byte();
IIC_Stop();
return date;
}