fm31256.c

fm31256读写源程序

#include <string.h>
#include <stdio.h>
#include <reg52.h>
#include <FM31256.h>


//==================================================================
//功能: 发送起始命令
//输入:
//输出:
//==================================================================
bit I2C_Start(void)
{
        I2C_SDA = 1;
        I2C_SCK =1;
        if ( I2C_SDA == 0)return 1;
         if ( I2C_SCK == 0)return 1;
        I2C_SDA = 0;
        I2C_SCK =0;
         return 0;
}
//==================================================================
//功能: 发送停止命令
//输入:
//输出:
//==================================================================
void  I2C_Stop(void)
{
        I2C_SDA = 0;
        I2C_SCK =1;
        I2C_SDA = 1;

}
//==================================================================
//功能:发送ack
//输入:
//输出:
//==================================================================
void I2C_Ack(void)
{
       I2C_SDA = 0;
       I2C_SCK =1;
       I2C_SCK =0;

}
//==================================================================
//功能: 发送Nack
//输入:
//输出:
//==================================================================
void I2C_Nack(void)
{
        I2C_SDA = 1;
        I2C_SCK =1;
        I2C_SCK =0;
}

//==================================================================
//功能: 发送1字节
//输入: 要发送数据 d
//输出: bit_ack
//==================================================================
bit I2C_Send_Byte( uchar d)
{
        uchar i = 8;
        bit bit_ack;
        while( i-- )
         {
          if ( d &0x80 )   I2C_SDA =1;
          else             I2C_SDA =0;
          I2C_SCK = 1;
          I2C_SCK = 0;
          d = d << 1;
         }
        I2C_SDA = 1;
        I2C_SCK = 1;
        bit_ack = I2C_SDA;
        I2C_SCK =0;
        return bit_ack;
}
//==================================================================
//功能: 接收1字节
//输入:
//输出: d 读出的数据
//==================================================================
uchar I2C_Receive_Byte(void)
{
        uchar i = 8, d;
        I2C_SDA = 1;
        while ( i--)
         {
          d = d << 1;
          I2C_SCK =1;
          if ( I2C_SDA ) d++;
          I2C_SCK =0;
         }
        return d;
}

//==================================================================
//功能: 向FM24C64写入数据0
//输入: FM24C64地址AT24C64_address
//      数据长度count
//输出: 0写入成功，1失败
//==================================================================
bit AT24C64_W_0(uint AT24C64_address,uint count)
{
 unsigned char status, add_l,add_h,write_10;
       add_l=AT24C64_address&0x00ff;
       add_h=AT24C64_address>>8;
       write_10=0;              //读10次
   start:
       write_10++;
       if(write_10>5){I2C_Stop(); return 1 ;}
       status=I2C_Start();
       if(status==1)goto start;

       status=I2C_Send_Byte(IIC_WRITE);
       if(status==1)goto start;
       status=I2C_Send_Byte( add_h);
       if(status==1)goto start;
       status=I2C_Send_Byte( add_l);
       if(status==1)goto start;
       while(count--)
         {
           status=I2C_Send_Byte( 0 );       //存储器清零
           if(status==1)goto start;
         }
       I2C_Stop();
       return 0;
}

//==================================================================
//功能: 向FM24C64写入数据
//输入: 数据地址*mcu_address
//      FM24C64地址AT24C64_address
//      数据长度count
//输出: 0写入成功，1失败
//==================================================================
bit AT24C64_W(void *mcu_address,uint AT24C64_address,uint count)
{
 uchar i,status, add_l,add_h,write_10;
        add_l=AT24C64_address&0x00ff;          //低位地址
        add_h=AT24C64_address>>8;              //高位地址
        write_10=0;              //写10次
   start:
        write_10++;
        if(write_10>2){I2C_Stop();return 1 ;}
        status=I2C_Start();
        if(status==1)goto start;
        status=I2C_Send_Byte(IIC_WRITE);        //发送字节A0标志
        if(status==1)goto start;
        status=I2C_Send_Byte( add_h);
        if(status==1)goto start;
        status=I2C_Send_Byte( add_l);
        if(status==1)goto start;
        i=0;
        while(count--)
          {
            status=I2C_Send_Byte( *(uchar*)mcu_address );
            if(status==1)goto start;
            ((uchar*)mcu_address)++;
          }
        I2C_Stop();
        return 0;
}

//==================================================================
//功能: 从FM24C64读出数据
//输入: 数据地址*mcu_address
//      FM24C64地址AT24C64_address
//      数据长度count
//输出: 0读出成功，1失败
//==================================================================
bit AT24C64_R(void *mcu_address,uint AT24C64_address,uint count)
{
 uchar i, add_l,add_h,read_10,status;
        add_l=AT24C64_address&0x00ff;
        add_h=AT24C64_address>>8;
        read_10=0;              //读10次
   start:
        read_10++;
        if(read_10>100){I2C_Nack(); I2C_Stop();return 1 ;}
        status=I2C_Start();
        if(status==1)goto start;
        status=I2C_Send_Byte(IIC_WRITE);
        if(status==1) goto start;
        status=I2C_Send_Byte( add_h);       //add_l
        if(status==1) goto start;
        status=I2C_Send_Byte( add_l );     //add_h
        if(status==1) goto start;
        status=I2C_Start();
        if(status==1)goto start;
        status=I2C_Send_Byte(IIC_READ);
        if(status==1)goto start;
        for(i=0;i<count-1;i++)
          {
            *(uchar*)mcu_address = I2C_Receive_Byte();
            ((uchar*)mcu_address)++;
            I2C_Ack();
          }
        *(uchar*)mcu_address = I2C_Receive_Byte();
       I2C_Nack();
       I2C_Stop();
       return 0;
}
//======================================================
void write_reg(uchar add,uchar wbyte)
{
	I2C_Start();
	I2C_Send_Byte(REG_WRITE);
	I2C_Send_Byte(add);
	I2C_Send_Byte(wbyte);
	I2C_Stop();
}
//=================================================
uchar read_reg (uchar add)
{
	uchar temp;
	I2C_Start();
	I2C_Send_Byte(REG_WRITE);
	I2C_Send_Byte(add);
	I2C_Nack();
	I2C_Stop();
	I2C_Start();
	I2C_Send_Byte(REG_READ);
	temp=I2C_Receive_Byte();
	I2C_Nack();
	I2C_Stop();
	return(temp);
}
//==================================================================
//功能: 读所有数据
//输入:
//输出:
//==================================================================
bit ic_m41t81_read_all_data()
{
 uchar i,read_10,status;
 uchar *pa;
 uchar flagstempa,flagstempb;
	flagstempa=read_reg(FLAGS);
	flagstempb=(flagstempa|0x01)&0xFD;
	write_reg(FLAGS, flagstempb);
        read_10=0;              //读10次
   start:
        read_10++;
        if(read_10>10){I2C_Nack(); I2C_Stop();return 1 ;}
        status=I2C_Start();
        if(status==1)goto start;
        status=I2C_Send_Byte(REG_WRITE);
        if(status==1) goto start;
        status=I2C_Send_Byte(SECONDS);
        if(status==1) goto start;
        status=I2C_Start();
        if(status==1)goto start;
        status=I2C_Send_Byte(REG_READ);
        if(status==1)goto start;
        pa=&newtime.miao;
        for(i=0;i<7-1;i++)
          {
            *(pa+i)= I2C_Receive_Byte();
            I2C_Ack();
          }
        *(pa+i)= I2C_Receive_Byte();
       I2C_Nack();
       I2C_Stop();
       write_reg(FLAGS, flagstempb&0XFE);
       return 0;
}


//==================================================================
//功能: 写入所有数据
//输入:
//输出:
//==================================================================
bit ic_m41t81_write_all_data()
{
 uchar i,status,write_10;
 uchar *pa;
 uchar flagstempa,flagstempb;
	flagstempa=read_reg(FLAGS);
	flagstempb=(flagstempa|0x02)&0xFE;
	write_reg(FLAGS, flagstempb);
        write_10=0;              //写10次
   start:
        write_10++;
        if(write_10>10){I2C_Stop();return 1 ;}
        status=I2C_Start();
        if(status==1)goto start;
        status=I2C_Send_Byte(REG_WRITE);        //发送字节A0标志
        if(status==1)goto start;
        status=I2C_Send_Byte( SECONDS);
        if(status==1)goto start;
        pa=&newtime.miao;
        for(i=0;i<7;i++)
          {
            status=I2C_Send_Byte(write_time[i+SECONDS]);
            if(status==1)goto start;
          }
       I2C_Stop();
       write_reg(FLAGS, flagstempb&0XFD);
       return 0;
}

//==================================================================
//功能: 写入寄存器更新位
//输入:
//输出:
//==================================================================
void ic_m41t81_write_clock_run()
{
   write_reg(CONTROL,0);
}

//==================================================================
//功能: 初始化fm24c64
//输入:
//输出:
//==================================================================
void  initfm31256()
{
  I2C_SCK     =1;
  I2C_SDA     =1;
  write_reg(CONTROL,0);
  write_reg(COMPANION,0);
}