EEPROM AT24C64地址1写入数据68，结果为255，怎么判断数据是否写入，或者问题是否出现在读？以下是程序和逻辑分析仪时序，求分析。
- void Datapros(uint num)
- {
- disp[0]=num/100+0x30;
- disp[1]=num%100/10+0x30;
- disp[2]=num%100%10+0x30;
- Disp_shuzi(100,100,disp[0],Red);
- Disp_shuzi(108,100,disp[1],Red);
- Disp_shuzi(116,100,disp[2],Red);
- }
- main()
- {
- while(1)
- { _24c64WriteByte(1,68); num=_24c64ReadByte(1);
- Datapros(num);
- }
-
- }
- /******************************************
- AT24C64C语言程序
- copyright@lance
- ******************************************/
- sbit ISCL = P6^4;
- sbit ISDA = P6^3;
- void delay1ms(Uint n)
- {
- Uint i,j;
- for(i=n;i>0;i--)
- {
- for(j=750;j>0;j--)
- {
- }
- }
- }
- /*****************************************
- I2c Wait
- Wait for some time to get proper I2C timing
- ******************************************/
- void I2cWait(void)
- {
- // unsigned int i=10; //24C64
- unsigned int i=5;//24C256
- while(i--);
- }
- /*****************************************
- i2c start
- condition SDA 1-0 while SCL=1
- ******************************************/
- void I2cStart(void)
- {
- ISDA=1;
- ISCL=1;
- I2cWait();
- ISDA=0;
- I2cWait();
- ISCL=0;
- I2cWait();
- }
- /*****************************************
- I2c sotp
- condition SDA=0-1 while SCL=1
- ******************************************/
- void I2cStop(void)
- {
- ISDA=0;
- I2cWait();
- ISCL=1;
- I2cWait();
- ISDA=1;
- I2cWait();
- }
- /*****************************************
- I2c Init
- Initialize I2C interface
- Release I2c BUS
- ****************************************
- void I2cInit(void)
- {
- ISDA=1;
- ISCL=1;
- I2cWait();
- }
- **/
- /*****************************************
- I2c SentByte
- master transfer data to slave and return acknowledge bit
- don't include<intrins.h>
- ******************************************/
- bit I2cSentByte(unsigned char bytedata)
- {
- unsigned char i;
- bit ack;
- for(i=0;i<8;i++)
- {
- if(bytedata & 0x80)
- ISDA=1;
- else
- ISDA=0;
- bytedata<<=1;
- I2cWait();
- ISCL=1;
- I2cWait();
- ISCL=0;
- I2cWait();
- }
- ISDA=1;
- I2cWait();
- ISCL=1;
- I2cWait();
- ack=ISDA;
- ISCL=0;
- I2cWait();
- return ack;
- }
- /*****************************************
- I2c ReceiveByte
- slave trransfer data to master
- ******************************************/
- unsigned char I2cReceiveByte(void)
- {
- unsigned char i;
- unsigned char bytedata=0;
- ISCL=0;
- I2cWait();
- for(i=0;i<8;i++)
- {
- ISCL=1;
- I2cWait();
- bytedata=bytedata<<1;
- if(ISDA==1)
- {
- bytedata = bytedata|0x01;
- }
- I2cWait();
- ISCL=0;
- I2cWait();
- }
- return bytedata;
- }
- /*****************************************
- I2c SendAcknowledge
- Master send acknowledge bit to slave
- acknowledge="0",non-acknowledge="1"
- ******************************************/
- void SendAcknowledge(bit ack)
- {
- ISDA=ack;
- ISCL=1;
- I2cWait();
- ISCL=0;
- }
- /*****************************************
- 24c64 WriteByte
- addr:0-8192
- value:数据
- ******************************************/
- void _24c64WriteByte(unsigned int addr,unsigned char value)
- {
- I2cStart();
- I2cSentByte(0xA0);
- I2cSentByte(addr>>8); //送高位地址
- I2cSentByte(addr&0x00ff); //送低位地址
- I2cSentByte(value);
- I2cStop();
- delay1ms(15);
- }
- /*****************************************
- 24c64 WriteMulti
- page:0-255
- count:要写入的数个数
- ******************************************/
- void _24c64WriteMulti(unsigned int page,unsigned char count,unsigned char *SenBuf)
- {
- unsigned char i;
- unsigned int addr=page*32;
- I2cStart();
- I2cSentByte(0xa0);
- I2cSentByte(addr>>8); //送高位地址
- I2cSentByte(addr&0x00ff); //送低位地址
- for(i=0;i<count;i++)
- {
- I2cSentByte(SenBuf[i]);
- }
- I2cStop();
- delay1ms(15);
- }
- /*****************************************
- 24c64 ReadByte
- addr:0-8192
- ******************************************/
- unsigned char _24c64ReadByte(unsigned int addr)
- {
- unsigned char temp;
- I2cStart();
- I2cSentByte(0xa0);
- I2cSentByte(addr>>8); //送高位地址
- I2cSentByte(addr&0x00ff); //送低位地址
- I2cStart();
- I2cSentByte(0xa1);
- temp=I2cReceiveByte();
- SendAcknowledge(1);
- I2cStop();
- return temp;
- }
- /*****************************************
- 24c64 ReadMulti
- page:0-256,count0-32
- count:要读出的数的个数
- ******************************************/
- void _24c64ReadMulti(unsigned int page,unsigned char count,unsigned char *RedBuf)
- { unsigned int addr=page*32;
- unsigned char i;
- for(i=0;i<count;i++)
- {
- RedBuf[i]=_24c64ReadByte(addr);
- addr++;
- }
- SendAcknowledge(1);
- I2cStop();
- }
|
