📄 24c256zhuan.c
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/*
刚刚调好了个24c256的操作，自己在程序里搞了个连续读写的函数！很烦那页写跨页的问题，所以干脆做了个通用点的函数，小于3字节的写就用随机写，大于3字节的就用页写！共享拉！
真正供其他操作调用的函数是:
unchar SeqWriteTo24c256(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf);
unchar SeqReadFrom24c256(unchar sla_add,unint addr_op,unchar read_size,unchar *read_buf);
其他的都是本文件内自己调用的函数!! */
//*****************************************************调试函数
void DebugEepromService(void)
{
unchar debug_buf[255];
debug_buf[0]=0x91;
debug_buf[1]=0x92;
debug_buf[2]=0x93;
debug_buf[3]=0x94;
debug_buf[4]=0x95;
debug_buf[250]=0x05;
debug_buf[251]=0x06;
debug_buf[252]=0x07;
debug_buf[253]=0x08;
debug_buf[254]=0x09;
SeqWriteTo24c256(EEP1_ADDR,1,255,debug_buf);
SeqReadFrom24c256(EEP1_ADDR,1,255,debug_buf);
}
//*************************************************************
#define IIC_SDA_PB 0x20
#define IIC_SCL_PB 0x80
#define IIC_DEL_WAIT 0x10 //>4.7us(12.80us) for Fre=11.0592M
#define IIC_DEL_WRITE 0x2700 //>6ms(7266.54us=7.266ms) for Fre=11.0592M
#define EEP1_ADDR 0xa4
#define PAGE_CAP_BYTE 64 //24C256页写容量:64字节
/*
功能函数文件
2005-9-22 9:54 by xth
版本: v1.0
--------------------------------------------
Mcu: avr mega32 Frequency: 11.0592M
--------------------------------------------
功能概述:Eeprom操作文件
--------------------------------------------
*/
//=============================函数声明
//----------IIC操作调用函数
void IicDelayService(unint delay_time);
void IicStartBitSend(void);
void IicStopBitSend(void);
void IicAckService(unchar ack_data);
unchar IicSendByteService(unchar tx_data);
unchar IicAccByteService(void);
//----------At24c256操作函数
unchar RandWriteByteTo24c256(unchar sla_add,unint addr_op,unchar data_op);
unchar WritePageTo24c256(unchar sla_add,unint addr_op,unchar *write_data_buf);
unchar SeqWriteTo24c256ByPage(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf);
unchar SeqWriteTo24c256(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf);
unchar SeqReadFrom24c256(unchar sla_add,unint addr_op,unchar read_size,unchar *read_buf);
//=============================函数定义
void IicDelayService(unint delay_count)
{
unint count;
for(count=0;count<delay_count;count++)
asm("NOP");
}
void IicStartBitSend(void)
{
PORTB |= IIC_SCL_PB; //发送起始条件的时钟信号
asm("NOP");
PORTB |= IIC_SDA_PB; //起始条件建立时间大于4.7us,延时
IicDelayService(IIC_DEL_WAIT);
PORTB &= ~IIC_SDA_PB;
IicDelayService(IIC_DEL_WAIT);
PORTB &= ~IIC_SCL_PB; //钳住I2C总线，准备发送或接收数据
asm("NOP");
}
void IicStopBitSend(void)
{
PORTB &= ~IIC_SDA_PB;//发送结束条件的时钟信号
IicDelayService(IIC_DEL_WAIT);
PORTB |= IIC_SCL_PB; //结束条件建立时间大于4μs
IicDelayService(IIC_DEL_WAIT);
PORTB |= IIC_SDA_PB;
asm("NOP");
}
void IicAckService(unchar ack_data)
{//作为主控器件应答->发应答或非应答信号
if(ack_data==0) PORTB &= ~IIC_SDA_PB;
else PORTB |= IIC_SDA_PB;
IicDelayService(IIC_DEL_WAIT);
PORTB |= IIC_SCL_PB;
IicDelayService(IIC_DEL_WAIT);
PORTB &= ~IIC_SCL_PB;//清时钟线，钳住I2C总线以便继续接收
asm("NOP");
}
unchar IicSendByteService(unchar tx_data)
{//将字节发送出去,可以是地址,也可以是数据,发完后等待应答并返回
unchar bit_count,ack_flag;
for(bit_count=0;bit_count<8;bit_count++)
{
if((tx_data<<bit_count)&0x80)
PORTB |= IIC_SDA_PB;
else
PORTB &= ~IIC_SDA_PB;
IicDelayService(IIC_DEL_WAIT);
PORTB |= IIC_SCL_PB; //置时钟线为高，通知被控器开始接收数据位
IicDelayService(IIC_DEL_WAIT); //保证时钟高电平周期大于4μs
PORTB &= ~IIC_SCL_PB;
}
IicDelayService(IIC_DEL_WAIT);
PORTB &= ~IIC_SDA_PB;
DDRB &= ~IIC_SDA_PB; //SDA置成输入
asm("NOP");
PORTB |= IIC_SCL_PB;
IicDelayService(IIC_DEL_WAIT);
IicDelayService(IIC_DEL_WAIT);
if(PINB&IIC_SDA_PB) //判断是否接收到应答信号
ack_flag=NO;
else
ack_flag=YES; //有应答信号
DDRB |= IIC_SDA_PB;
PORTB &= ~IIC_SCL_PB;
asm("NOP");
return(ack_flag);
}
unchar IicAccByteService(void)
{//接收从器件传来的数据,并判断总线错误
unchar bit_count,get_data;
DDRB &= ~IIC_SDA_PB;
get_data=0;
for(bit_count=0;bit_count<8;bit_count++)
{
asm("NOP");
PORTB &= ~IIC_SCL_PB; //置时钟线为低，准备接收数据位
IicDelayService(IIC_DEL_WAIT); //时钟低电平周期大于4.7μs;
PORTB |= IIC_SCL_PB; //置时钟线为高使数据线上数据有效
get_data<<=1;
if(PINB&IIC_SDA_PB)
get_data++;
asm("NOP");
asm("NOP");
}
PORTB &= ~IIC_SCL_PB;
DDRB |= IIC_SDA_PB;
asm("NOP");
return(get_data);
}
unchar RandWriteByteTo24c256(unchar sla_add,unint addr_op,unchar data_op)
{
unchar result_now,temp_data;
IicStartBitSend(); //起始条件
temp_data=sla_add; //从器件地址
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
temp_data=addr_op>>8; //操作单元地址高8位
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
temp_data=addr_op; //操作单元地址低8位
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
temp_data=data_op; //操作数据
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
IicStopBitSend(); //停止条件
IicDelayService(IIC_DEL_WRITE);
result_now=YES;
return(result_now);
}
unchar SeqReadFrom24c256(unchar sla_add,unint addr_op,unchar read_size,unchar *read_buf)
{//addr “roll over” during read:from last byte of the last page, to the first byte of the first page
unchar result_now,temp_data,read_count;
IicStartBitSend(); //起始条件
temp_data=sla_add; //从器件地址
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
temp_data=addr_op>>8; //操作单元地址高8位
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
temp_data=addr_op; //操作单元地址低8位
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
IicStartBitSend();
temp_data=sla_add+1; //读操作
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
for(read_count=0;read_count<read_size-1;read_count++)
{ //连续读数据
*(read_buf+read_count)=IicAccByteService();
IicAckService(NO);
}
*(read_buf+read_count)=IicAccByteService();
IicAckService(YES);
IicStopBitSend();
result_now=YES;
return(result_now);
}
unchar WritePageTo24c256(unchar sla_add,unint addr_op,unchar *write_data_buf)
{//页写
unchar count,result_now,temp_data;
IicStartBitSend(); //起始条件
temp_data=sla_add; //从器件地址
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
temp_data=addr_op>>8; //操作单元地址高8位
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
temp_data=addr_op; //操作单元地址低8位
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
for(count=0;count<PAGE_CAP_BYTE;count++)
{//连续写
temp_data=*(write_data_buf+count);
result_now=IicSendByteService(temp_data);
if(result_now==NO) return(result_now);
}
IicStopBitSend(); //停止条件
IicDelayService(IIC_DEL_WRITE);
result_now=YES;
return(result_now);
}
unchar SeqWriteTo24c256ByPage(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf)
{//addr “roll over” during write:from last byte of the current page to first byte of the same page.
unint page_write,read_addr,temp_op_int;
unchar data_count,result_out,modify_count,count,write_data_buf[PAGE_CAP_BYTE];
result_out=YES;
data_count=0;
while(write_size>0)
{
page_write=addr_op/PAGE_CAP_BYTE; //得到当前页
read_addr=page_write*PAGE_CAP_BYTE;
SeqReadFrom24c256(sla_add,read_addr,PAGE_CAP_BYTE,write_data_buf);
temp_op_int=addr_op&(PAGE_CAP_BYTE-1); //得到在页内的起始字节地址
if(temp_op_int+write_size>=PAGE_CAP_BYTE)
{
modify_count=PAGE_CAP_BYTE;
addr_op=(page_write+1)*PAGE_CAP_BYTE; //写下一页的起始地址
}
else
modify_count=write_size;
count=temp_op_int;
write_size=write_size-modify_count+count; //写下一页的数据量
for(;count<modify_count;count++,data_count++)
write_data_buf[count]=*(write_buf+data_count);
result_out=WritePageTo24c256(sla_add,read_addr,write_data_buf);
}
return(result_out);
}
unchar SeqWriteTo24c256(unchar sla_add,unint addr_op,unchar write_size,unchar *write_buf)
{//连续写(非页写)
unchar write_result;
if(write_size<3)
{//如果要写入的数据小于3个,则用随机写实现
write_result=RandWriteByteTo24c256(sla_add,addr_op,*write_buf);
write_result=RandWriteByteTo24c256(sla_add,addr_op+1,*(write_buf+1));
}
else
write_result=SeqWriteTo24c256ByPage(sla_add,addr_op,write_size,write_buf);
return(write_result);
}
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