143612_906089.htm

本例程是描述了通过PIC33FXXX单片机的I2C接口实现对单片机外围EEPROM的访问

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          <td height="30" bgcolor="#E3F2FD" class="font14"><strong><font color="#000000">&nbsp;&nbsp;</font>PIC24F之EEPROM读写中断事件处理函数要点及说明&nbsp;</strong></td>
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                <td class="font13"><p style="TEXT-INDENT: 2em">/*-------------------------------------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em">PIC24F之<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读写中断事件处理函数要点及说明</p><p style="TEXT-INDENT: 2em">注意: 这是一个通用的I2C/SMBUS通讯中断处理程序</p><p style="TEXT-INDENT: 2em">对于<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>来讲，从机后面需要跟<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>需要读写的地址(I2CRegs.RWAddr)</p><p style="TEXT-INDENT: 2em">对于SMBUS来说,从机后面需要跟SMBUS需要的命令(I2CRegs.RWAddr改为I2CRegs.CMD即可)</p><p style="TEXT-INDENT: 2em">由于PIC24F的I2C不太标准,I2C1STAT被搞得很倒塌！！！一点都没I2C的&quot;大家闺秀&quot;的样子~~~</p><p style="TEXT-INDENT: 2em">不过它的STOP还能激活中断确实比LPCARM/AVR好一点点~~~</p><p style="TEXT-INDENT: 2em">为什么I2C收发都用中断呢???</p><p style="TEXT-INDENT: 2em">这主要是为了高低速灵活变化的总线通讯所做，主要是SMBUS总线的通信.</p><p style="TEXT-INDENT: 2em">菜农在LPCARM/AVR上用此程序模板可谓不怕数据被干扰~~~</p><p style="TEXT-INDENT: 2em">如果为I2cExit()也配上钩子函数,那么任何错误都在手掌中~~~</p><p style="TEXT-INDENT: 2em">这个PIC程序虽没SMBUS的PEC校验部分,但&quot;异步&quot;还是完美的.</p><p style="TEXT-INDENT: 2em">当然也要注意对写保护硬件管脚的控制时机的把握，原则是关保护的时间最短就更好~~~</p><p style="TEXT-INDENT: 2em">菜农本来PIC24F菜鸟已“毕业”，但还是“忍痛”发表出来~~~</p><p style="TEXT-INDENT: 2em">主要看到人们编写MCU程序太死板~~~特别是I2C程序.网上收发全中断的很少，可以说几乎没有.</p><p style="TEXT-INDENT: 2em">随贴附老外倒塌的非中断I2C状态机读写程序i2cEmem.c~~~可以比较经典和非典的差异在何处~~~</p><p style="TEXT-INDENT: 2em">菜农近期将整理出LPCARM和AVR的I2C/SMBUS/TWI/USI收发全中断实战例程供大家“游玩”~~~</p><p style="TEXT-INDENT: 2em">如果精通<a href="http://www.ic37.com/DELPHI-p.htm" target="_blank" title="DELPHI PDF资料和全国供应商">DELPHI</a>程序的人一定会为“事件驱动”机制而痴迷~~~为什么不在MCU上&quot;声东击西&quot;呢???</p><p style="TEXT-INDENT: 2em">&quot;有事件才处理&quot;---这才是编程的硬道理~~~轮循的“痴迷等待”最终还是“单相思”~~~</p><p style="TEXT-INDENT: 2em">本程序附实战结果图.(因为菜农的程序从来不空谈社会主义~~~)</p><p style="TEXT-INDENT: 2em">原本是在&quot;鸡蛋节&quot;献给大家，由于&quot;忆苦思甜&quot;没发~~~就算是“臭蛋节”的礼物吧~~~</p><p style="TEXT-INDENT: 2em">菜农 [e-mail]2007.12.25 &quot;鸡蛋节&quot;于大雁塔菜地</p><p style="TEXT-INDENT: 2em">--------------------------------------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">#include &quot;i2c.h&quot;</p><p style="TEXT-INDENT: 2em">_PERSISTENT volatile I2CREGS I2CRegs;</p><p style="TEXT-INDENT: 2em">_PERSISTENT volatile I2CBITS I2CBits;</p><p style="TEXT-INDENT: 2em">void I2cInit(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">unsigned int i;</p><p style="TEXT-INDENT: 2em">TRIS_WP= PORTOUTMODE;//定义WP为输出IO</p><p style="TEXT-INDENT: 2em">TRIS_SCL1 = PORTOUTMODE;//定义SCL为输出IO</p><p style="TEXT-INDENT: 2em">TRIS_SDA1 = PORTINPUTMODE;//定义SDA为输出入IO</p><p style="TEXT-INDENT: 2em">ODC_SCL1 = 1;//OC输出</p><p style="TEXT-INDENT: 2em">ODC_SDA1 = 1;//OC输出</p><p style="TEXT-INDENT: 2em">WP = 1;//写保护</p><p style="TEXT-INDENT: 2em">I2CRegs.MaxCount = 0x200;//8KByte</p><p style="TEXT-INDENT: 2em">I2CRegs.I2CAddr = 0xa0;//器件地址</p><p style="TEXT-INDENT: 2em">I2CRegs.RWAddr = 0;//<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读写地址</p><p style="TEXT-INDENT: 2em">I2CRegs.TxCount = 0;//发送数据字节个数</p><p style="TEXT-INDENT: 2em">I2CRegs.RxCount = 0;//接收数据字节个数</p><p style="TEXT-INDENT: 2em">for (i = 0; i &lt; 16; i ++)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CRegs.TxBuffer[i] = 0;//发送缓冲区清零</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">for (i = 0; i &lt; 256; i ++)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CRegs.RxBuffer[i] = 0;//接收缓冲区清零</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">I2C1CON = 0;</p><p style="TEXT-INDENT: 2em">//I2C1CONbits.A10M = 0;//7位地址模式</p><p style="TEXT-INDENT: 2em">I2C1CONbits.SCLREL = 1;</p><p style="TEXT-INDENT: 2em">I2C1MSK = 0;</p><p style="TEXT-INDENT: 2em">I2C1STAT = 0;</p><p style="TEXT-INDENT: 2em">_MI2C1IF = 0;</p><p style="TEXT-INDENT: 2em">_SI2C1IF = 0;</p><p style="TEXT-INDENT: 2em">I2C1BRG = (FCY / (2 * I2CBAUD)) - 1;//波特率计算</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em">定义I2C串口2中断优先级位1111)</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">IPC4bits.MI2C1P0 = 1;</p><p style="TEXT-INDENT: 2em">IPC4bits.MI2C1P1 = 1;</p><p style="TEXT-INDENT: 2em">IPC4bits.MI2C1P2 = 1;</p><p style="TEXT-INDENT: 2em">I2C1CONbits.I2CEN = 1;//允许I2C功能</p><p style="TEXT-INDENT: 2em">_MI2C1IE = 1;//允许主设备中断</p><p style="TEXT-INDENT: 2em">//I2cStop();</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读块函数(只能在回调函数I2CReadCallBack中得到读出的数据)</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2CReadBuffers(unsigned int E2RomAddr, unsigned int ReadSize)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (ReadSize &amp;&amp; (ReadSize &lt;= 256))</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CRegs.TxCount = 0;</p><p style="TEXT-INDENT: 2em">I2CRegs.RxCount = ReadSize;</p><p style="TEXT-INDENT: 2em">I2CRegs.RWAddr = E2RomAddr;</p><p style="TEXT-INDENT: 2em">I2CRegs.I2CAddr |= 1;//0xa1</p><p style="TEXT-INDENT: 2em">I2cStart();</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">void I2CReadByte(unsigned int E2RomAddr)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CRegs.TxCount = 0;</p><p style="TEXT-INDENT: 2em">I2CRegs.RxCount = 1;</p><p style="TEXT-INDENT: 2em">I2CRegs.RWAddr = E2RomAddr;</p><p style="TEXT-INDENT: 2em">I2CRegs.I2CAddr |= 1;//0xa1</p><p style="TEXT-INDENT: 2em">I2cStart();</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写块函数</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2CWriteBuffers(unsigned int E2RomAddr, unsigned int WriteSize)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (WriteSize &amp;&amp; (WriteSize &lt;= 16))</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CRegs.TxCount = WriteSize;</p><p style="TEXT-INDENT: 2em">I2CRegs.RxCount = 0;</p><p style="TEXT-INDENT: 2em">I2CRegs.RWAddr = E2RomAddr;</p><p style="TEXT-INDENT: 2em">I2CRegs.I2CAddr &amp;= 0xfe;//0xa0</p><p style="TEXT-INDENT: 2em">I2cStart();</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">void I2CWriteByte(unsigned int E2RomAddr, unsigned char cData)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CRegs.TxBuffer[0] = cData;</p><p style="TEXT-INDENT: 2em">I2CRegs.TxCount = 1;</p><p style="TEXT-INDENT: 2em">I2CRegs.RxCount = 0;</p><p style="TEXT-INDENT: 2em">I2CRegs.RWAddr = E2RomAddr;</p><p style="TEXT-INDENT: 2em">I2CRegs.I2CAddr &amp;= 0xfe;//0xa0</p><p style="TEXT-INDENT: 2em">I2cStart();</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em">用户读回调函数</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2CReadCallBack(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if ((I2CRegs.RWAddr + I2CRegs.RxCount) &lt;= I2CRegs.MaxCount) </p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">//I2CRegs.RWAddr += I2CRegs.RxCount;</p><p style="TEXT-INDENT: 2em">//I2CReadBuffers(I2CRegs.RWAddr, I2CRegs.RxCount);//继续读</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em">用户写回调函数</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2CWriteCallBack(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if ((I2CRegs.RWAddr + I2CRegs.TxCount) &lt;= I2CRegs.MaxCount) </p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">//I2CRegs.RWAddr += I2CRegs.TxCount;</p><p style="TEXT-INDENT: 2em">//I2CWriteBuffers(I2CRegs.RWAddr, I2CRegs.TxCount);//继续写</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读写启动函数</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2cStart(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em">//本程序在状态I2C_MT_ADDRL_ACK下进行瞬间打开,也可在此打开，不过安全不好</p><p style="TEXT-INDENT: 2em">if (I2CRegs.TxCount)//需要写入字节</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">WP = 0;//不写保护</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">WP = 1;//写保护</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">--------------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">I2C1STATbits.IWCOL = 0;</p><p style="TEXT-INDENT: 2em">I2CBits.BusyFlag = 1;</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_START;//主机准备发送启始位</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//发送数据个数</p><p style="TEXT-INDENT: 2em">I2CBits.I2CFlag = 0;</p><p style="TEXT-INDENT: 2em">I2C1CONbits.SEN = 1;//发送Start信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读再启动函数</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2cReStart(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1STATbits.IWCOL = 0;</p><p style="TEXT-INDENT: 2em">I2CBits.BusyFlag = 1;</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_REP_START;//主机准备发送重新启始位</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//发送数据个数</p><p style="TEXT-INDENT: 2em">I2C1CONbits.RSEN = 1;//发送ReStart信号</p><p style="TEXT-INDENT: 2em">I2C1CONbits.ACKEN = 0;</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读写正确停止函数</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2cStop(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1STATbits.IWCOL = 0;</p><p style="TEXT-INDENT: 2em">I2CBits.BusyFlag = 0;</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_SUCCEEDED;//通讯成功</p><p style="TEXT-INDENT: 2em">I2C1CONbits.PEN = 1;//发送Stop信号</p><p style="TEXT-INDENT: 2em">WP = 1;//写保护</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读写错误退出函数</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2cExit(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1STATbits.IWCOL = 0;</p><p style="TEXT-INDENT: 2em">I2CBits.BusyFlag = 0;</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_FAILED;</p><p style="TEXT-INDENT: 2em">I2C1CONbits.PEN = 1;//发送Stop信号</p><p style="TEXT-INDENT: 2em">WP = 1;//写保护</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>读写中断事件处理函数(说明见文件头部)</p><p style="TEXT-INDENT: 2em">-------------------------------------------------------------------*/</p><p style="TEXT-INDENT: 2em">void I2CExec(void)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2C1STATbits.S)//收到Start过信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em"><a href="http://www.ic37.com/switch-p.htm" target="_blank" title="switch PDF资料和全国供应商">switch</a> (I2CRegs.State)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">case I2C_START://收到Start信号</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.I2CAddr &amp; 0xfe;//发送器件写地址(通知从机只能听)</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_SLA_ACK;//下次应该接收器件写地址应答信号</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MT_SLA_ACK://收到器件写地址应答信号</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.MaxCount &gt; 0x100)//<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>容量超过256个字节,<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>地址需要两次发送</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.RWAddr &gt;&gt; 8;//发送<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写高8位地址</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_ADDRH_ACK;//下次应该接收<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写高8位地址应答信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//小容量只需一次发送!!!</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.RWAddr;//发送<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写低8位地址</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_ADDRL_ACK;//下次应该接收<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写低8位地址应答信号</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//清空发送缓冲计数器</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//错误的ACK信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MT_ADDRH_ACK://收到<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写高8位地址应答信号</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.RWAddr &amp; 0xff;//发送<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写低8位地址</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_ADDRL_ACK;//下次应该接收<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写低8位地址应答信号</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//清空发送缓冲计数器</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//错误的ACK信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MT_ADDRL_ACK://收到<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>写高低8位地址应答信号</p><p style="TEXT-INDENT: 2em">if (I2CRegs.TxCount)//写保护只在写入期间不保护，增加了对误写入的安全防护能力!!!</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">WP = 0;//不写保护</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">case I2C_MT_DATA_ACK://收到应答信号</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.Count &lt; I2CRegs.TxCount)//缓冲区未空</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.TxBuffer[I2CRegs.Count ++];//继续发送数据</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else if (I2CRegs.Count == I2CRegs.TxCount)//缓冲区已空</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.I2CAddr &amp; 1)//应该开始接收数据</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cReStart();//发送重复位命令</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//只写退出</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cStop();//正常发送结束</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//干扰出错</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//错误</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信号(可能被写保护)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//错误的ACK信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_REP_START://收到ReStart信号</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.I2CAddr | I2C_READ;//发送器件读地址(通知从机可以说话)</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_SLA_ACK;//下次应该接收器件写读地址应答信号</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_SLA_ACK://收到器件读地址应答信号</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1CONbits.RCEN = 1;//开始接收数据</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA;//下次应该收接收数据</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//错误的ACK信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_DATA://收到接收数据</p><p style="TEXT-INDENT: 2em">if (I2CRegs.Count &lt; I2CRegs.RxCount)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">//I2C1STATbits.I2COV = 0;</p><p style="TEXT-INDENT: 2em">I2CRegs.RxBuffer[I2CRegs.Count ++] = I2C1RCV;</p><p style="TEXT-INDENT: 2em">if (I2CRegs.Count &lt; I2CRegs.RxCount)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1CONbits.ACKDT = 0;//应答子机</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA_EN;//下次应该收到器件允许继续读信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1CONbits.ACKDT = 1;//非应答子机</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA_STOP;//下次应该收到退出信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">I2C1CONbits.ACKEN = 1;//向从机发送(非)应答信号</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//正确的状态已分支到I2C_MR_DATA_STOP</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//错误</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_DATA_EN://收到器件允许继续读信号</p><p style="TEXT-INDENT: 2em">I2C1CONbits.RCEN = 1;//开始接收数据</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA;//下次应该继续接收数据</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_DATA_STOP://收到器件退出信号</p><p style="TEXT-INDENT: 2em">I2cStop();//正常接收结束</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">default://其他不可预料的错误</p><p style="TEXT-INDENT: 2em">I2cExit();//错误</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else if (I2C1STATbits.P)//收到Stop信号</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.State == I2C_SUCCEEDED)//成功,回调</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.I2CAddr &amp; 1)//读</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CBits.ReadFlag = 1;//激活用户读回调函数I2CReadCallBack()</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//写</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CBits.WriteFlag = 1;//激活用户写回调函数I2CWriteCallBack()</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//无法确认的复杂错误 </p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//错误出错退出</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">下附I2CReadBuffers(0, 10)结果图</p><p style="TEXT-INDENT: 2em"><img border=0 src='http://2008sfile.ic37.com/2008file/bbs_dic/2008-2-9/0209232306_143612_0.gif'></p><p style="TEXT-INDENT: 2em"> <br> <font color="#999999">作者：hotpower&nbsp;&nbsp;2007-12-26 19:16:00</font> </td>
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          <td height="25" bgcolor="#E3F2FD"><strong><font color="#000000"><font color="#FFFFFF">&nbsp;&nbsp;</font></font></strong><font color="#0066CC">回复1</font>&nbsp;&nbsp;对应的I2C.H608989</td>
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          <td height="38" bgcolor="#FFFFFF"><table width="100%" border="0" align="center" cellpadding="10" cellspacing="0" class="heigh22">
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                <td class="font13"><p style="TEXT-INDENT: 2em">#include &quot;main.h&quot;</p><p style="TEXT-INDENT: 2em">#ifndef __I2C_H</p><p style="TEXT-INDENT: 2em">#define __I2C_H</p><p style="TEXT-INDENT: 2em">#define I2CBAUD 800000//800KHz本程序是读写铁电的，故速度很高</p><p style="TEXT-INDENT: 2em">//下面的是I2C的标准状态表,因为PIC的不标准,故凑合着用和补充了加注解的部分~~~</p><p style="TEXT-INDENT: 2em">enum enum_I2CState</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">/* <a href="http://www.ic37.com/Master-p.htm" target="_blank" title="Master PDF资料和全国供应商">Master</a> */</p><p style="TEXT-INDENT: 2em">I2C_START =0x08,//启动</p><p style="TEXT-INDENT: 2em">I2C_REP_START=0x10,//重启动</p><p style="TEXT-INDENT: 2em">/* <a href="http://www.ic37.com/Master-p.htm" target="_blank" title="Master PDF资料和全国供应商">Master</a> Transmitter */</p><p style="TEXT-INDENT: 2em">I2C_MT_SLA_ACK=0x18,//主发模式下得到从机地址应答信号</p><p style="TEXT-INDENT: 2em">I2C_MT_SLA_NACK=0x20,</p><p style="TEXT-INDENT: 2em">I2C_MT_DATA_ACK=0x28,//主发模式下得到从机数据应答信号</p><p style="TEXT-INDENT: 2em">I2C_MT_DATA_NACK=0x30,</p><p style="TEXT-INDENT: 2em">I2C_MT_ARB_LOST=0x38,</p><p style="TEXT-INDENT: 2em">/* <a href="http://www.ic37.com/Master-p.htm" target="_blank" title="Master PDF资料和全国供应商">Master</a> <a href="http://www.ic37.com/Receiver-p.htm" target="_blank" title="Receiver PDF资料和全国供应商">Receiver</a> */</p><p style="TEXT-INDENT: 2em">I2C_MR_ARB_LOST=0x38,</p><p style="TEXT-INDENT: 2em">I2C_MR_SLA_ACK=0x40,//主收模式下得到从机地址应答信号</p><p style="TEXT-INDENT: 2em">I2C_MR_SLA_NACK=0x48,</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA_ACK=0x50,</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA_NACK=0x58,</p><p style="TEXT-INDENT: 2em">/* Slave Transmitter */</p><p style="TEXT-INDENT: 2em">I2C_ST_SLA_ACK=0xA8,</p><p style="TEXT-INDENT: 2em">I2C_ST_ARB_LOST_SLA_ACK=0xB0,</p><p style="TEXT-INDENT: 2em">I2C_ST_DATA_ACK=0xB8,</p><p style="TEXT-INDENT: 2em">I2C_ST_DATA_NACK=0xC0,</p><p style="TEXT-INDENT: 2em">I2C_ST_LAST_DATA=0xC8,</p><p style="TEXT-INDENT: 2em">/* Slave <a href="http://www.ic37.com/Receiver-p.htm" target="_blank" title="Receiver PDF资料和全国供应商">Receiver</a> */</p><p style="TEXT-INDENT: 2em">I2C_SR_SLA_ACK=0x60,</p><p style="TEXT-INDENT: 2em">I2C_SR_ARB_LOST_SLA_ACK=0x68,</p><p style="TEXT-INDENT: 2em">I2C_SR_GCALL_ACK=0x70,</p><p style="TEXT-INDENT: 2em">I2C_SR_ARB_LOST_GCALL_ACK=0x78,</p><p style="TEXT-INDENT: 2em">I2C_SR_DATA_ACK=0x80,</p><p style="TEXT-INDENT: 2em">I2C_SR_DATA_NACK=0x88,</p><p style="TEXT-INDENT: 2em">I2C_SR_GCALL_DATA_ACK=0x90,</p><p style="TEXT-INDENT: 2em">I2C_SR_GCALL_DATA_NACK=0x98,</p><p style="TEXT-INDENT: 2em">I2C_SR_STOP=0xA0,</p><p style="TEXT-INDENT: 2em">/* Misc */</p><p style="TEXT-INDENT: 2em">I2C_NO_INFO=0xF8,</p><p style="TEXT-INDENT: 2em">I2C_MT_ADDRH_ACK=0x3a,//主发模式下得到从机高位<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>地址应答信号</p><p style="TEXT-INDENT: 2em">I2C_MT_ADDRL_ACK=0x3b,//主发模式下得到从机高低位<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF资料和全国供应商">EEPROM</a>地址应答信号</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA=0x5a,//主收模式下接收数据</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA_EN=0x5b,//主收模式下使能接收数据功能</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA_STOP=0x5c,//主收模式下接收数据完成</p><p style="TEXT-INDENT: 2em">I2C_FAILED=0xcc,//读写操作失败</p><p style="TEXT-INDENT: 2em">I2C_SUCCEEDED=0x00,//读写操作成功</p><p style="TEXT-INDENT: 2em">I2C_RWBIT=0,//</p><p style="TEXT-INDENT: 2em">I2C_READ=1,//</p><p style="TEXT-INDENT: 2em">I2C_WRITE=0//</p><p style="TEXT-INDENT: 2em">};</p><p style="TEXT-INDENT: 2em">#define TRIS_SCL1 _TRISG2 //SCL方向控制</p><p style="TEXT-INDENT: 2em">#define TRIS_SDA1 _TRISG3 //SDA方向控制</p><p style="TEXT-INDENT: 2em">#define ODC_SCL1 _ODG2 //SCL开漏控制</p><p style="TEXT-INDENT: 2em">#define ODC_SDA1 _ODG3 //SDA开漏控制</p><p style="TEXT-INDENT: 2em">/*-----------------------------------------</p><p style="TEXT-INDENT: 2em">写保护管脚定义,需要硬件的支持</p><p style="TEXT-INDENT: 2em">------------------------------------------*/</p><p style="TEXT-INDENT: 2em">#define TRIS_WP_TRISD0 //WP方向控制</p><p style="TEXT-INDENT: 2em">#define WP _LATD0//写保护</p><p style="TEXT-INDENT: 2em">typedef struct tagI2CBITS</p><p style="TEXT-INDENT: 2em">{ </p><p style="TEXT-INDENT: 2em">union</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">unsigned char I2CFlag;</p><p style="TEXT-INDENT: 2em">struct</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">unsigned charBusyFlag:1;//忙标志</p><p style="TEXT-INDENT: 2em">unsigned charReadFlag:1;//读回调标志</p><p style="TEXT-INDENT: 2em">unsigned charWriteFlag:1;//写回调标志</p><p style="TEXT-INDENT: 2em">};</p><p style="TEXT-INDENT: 2em">};</p><p style="TEXT-INDENT: 2em">}I2CBITS;</p><p style="TEXT-INDENT: 2em">extern volatile I2CBITS I2CBits;</p><p style="TEXT-INDENT: 2em">typedef struct tagI2CREGS</p><p style="TEXT-INDENT: 2em">{ </p><p style="TEXT-INDENT: 2em">unsigned char State;//运行状态编码</p><p style="TEXT-INDENT: 2em">unsigned char I2CAddr;//器件地址0xa1,0xa0</p><p style="TEXT-INDENT: 2em">unsigned int RWAddr;//器件读写地址(自动根据MaxCount判断长短地址)</p><p style="TEXT-INDENT: 2em">unsigned int Count;//运行计数器</p><p style="TEXT-INDENT: 2em">unsigned int TxCount;//发送(写)个数</p><p style="TEXT-INDENT: 2em">unsigned int RxCount;//接收(读)个数</p><p style="TEXT-INDENT: 2em">unsigned int MaxCount;//器件最大容量</p><p style="TEXT-INDENT: 2em">unsigned char TxBuffer[16];//发送缓冲区</p><p style="TEXT-INDENT: 2em">unsigned char RxBuffer[256];//接收缓冲区</p><p style="TEXT-INDENT: 2em">}I2CREGS;</p><p style="TEXT-INDENT: 2em">extern volatile I2CREGS I2CRegs;</p><p style="TEXT-INDENT: 2em">void I2cInit(void);</p><p style="TEXT-INDENT: 2em">void I2CReadBuffers(unsigned int, unsigned int);</p><p style="TEXT-INDENT: 2em">void I2CReadByte(unsigned int);</p><p style="TEXT-INDENT: 2em">void I2CWriteBuffers(unsigned int, unsigned int);</p><p style="TEXT-INDENT: 2em">void I2CWriteByte(unsigned int, unsigned char);</p><p style="TEXT-INDENT: 2em">void I2CReadCallBack(void);</p><p style="TEXT-INDENT: 2em">void I2CWriteCallBack(void);</p><p style="TEXT-INDENT: 2em">void I2cStart(void);</p><p style="TEXT-INDENT: 2em">void I2cReStart(void);</p><p style="TEXT-INDENT: 2em">void I2cStop(void);</p><p style="TEXT-INDENT: 2em">void I2CExec(void);</p><p style="TEXT-INDENT: 2em">#endif//__I2C_H</p><p style="TEXT-INDENT: 2em"> <font color="#0066CC"><br>
                  <font color="#999999">作者：hotpower&nbsp;&nbsp;2007-12-26 19:17:00</font></font></td>
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