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?? 本例程是描述了通過PIC33FXXX單片機的I2C接口實現對單片機外圍EEPROM的訪問
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          <td height="30" bgcolor="#E3F2FD" class="font14"><strong><font color="#000000">&nbsp;&nbsp;</font>PIC24F之EEPROM讀寫中斷事件處理函數要點及說明&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資料和全國供應商">EEPROM</a>讀寫中斷事件處理函數要點及說明</p><p style="TEXT-INDENT: 2em">注意: 這是一個通用的I2C/SMBUS通訊中斷處理程序</p><p style="TEXT-INDENT: 2em">對于<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>來講，從機后面需要跟<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>需要讀寫的地址(I2CRegs.RWAddr)</p><p style="TEXT-INDENT: 2em">對于SMBUS來說,從機后面需要跟SMBUS需要的命令(I2CRegs.RWAddr改為I2CRegs.CMD即可)</p><p style="TEXT-INDENT: 2em">由于PIC24F的I2C不太標準,I2C1STAT被搞得很倒塌！！！一點都沒I2C的&quot;大家閨秀&quot;的樣子~~~</p><p style="TEXT-INDENT: 2em">不過它的STOP還能激活中斷確實比LPCARM/AVR好一點點~~~</p><p style="TEXT-INDENT: 2em">為什么I2C收發都用中斷呢???</p><p style="TEXT-INDENT: 2em">這主要是為了高低速靈活變化的總線通訊所做，主要是SMBUS總線的通信.</p><p style="TEXT-INDENT: 2em">菜農在LPCARM/AVR上用此程序模板可謂不怕數據被干擾~~~</p><p style="TEXT-INDENT: 2em">如果為I2cExit()也配上鉤子函數,那么任何錯誤都在手掌中~~~</p><p style="TEXT-INDENT: 2em">這個PIC程序雖沒SMBUS的PEC校驗部分,但&quot;異步&quot;還是完美的.</p><p style="TEXT-INDENT: 2em">當然也要注意對寫保護硬件管腳的控制時機的把握，原則是關保護的時間最短就更好~~~</p><p style="TEXT-INDENT: 2em">菜農本來PIC24F菜鳥已“畢業”，但還是“忍痛”發表出來~~~</p><p style="TEXT-INDENT: 2em">主要看到人們編寫MCU程序太死板~~~特別是I2C程序.網上收發全中斷的很少，可以說幾乎沒有.</p><p style="TEXT-INDENT: 2em">隨貼附老外倒塌的非中斷I2C狀態機讀寫程序i2cEmem.c~~~可以比較經典和非典的差異在何處~~~</p><p style="TEXT-INDENT: 2em">菜農近期將整理出LPCARM和AVR的I2C/SMBUS/TWI/USI收發全中斷實戰例程供大家“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資料和全國供應商">DELPHI</a>程序的人一定會為“事件驅動”機制而癡迷~~~為什么不在MCU上&quot;聲東擊西&quot;呢???</p><p style="TEXT-INDENT: 2em">&quot;有事件才處理&quot;---這才是編程的硬道理~~~輪循的“癡迷等待”最終還是“單相思”~~~</p><p style="TEXT-INDENT: 2em">本程序附實戰結果圖.(因為菜農的程序從來不空談社會主義~~~)</p><p style="TEXT-INDENT: 2em">原本是在&quot;雞蛋節&quot;獻給大家，由于&quot;憶苦思甜&quot;沒發~~~就算是“臭蛋節”的禮物吧~~~</p><p style="TEXT-INDENT: 2em">菜農 HotPower@126.com2007.12.25 &quot;雞蛋節&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;//定義WP為輸出IO</p><p style="TEXT-INDENT: 2em">TRIS_SCL1 = PORTOUTMODE;//定義SCL為輸出IO</p><p style="TEXT-INDENT: 2em">TRIS_SDA1 = PORTINPUTMODE;//定義SDA為輸出入IO</p><p style="TEXT-INDENT: 2em">ODC_SCL1 = 1;//OC輸出</p><p style="TEXT-INDENT: 2em">ODC_SDA1 = 1;//OC輸出</p><p style="TEXT-INDENT: 2em">WP = 1;//寫保護</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資料和全國供應商">EEPROM</a>讀寫地址</p><p style="TEXT-INDENT: 2em">I2CRegs.TxCount = 0;//發送數據字節個數</p><p style="TEXT-INDENT: 2em">I2CRegs.RxCount = 0;//接收數據字節個數</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;//發送緩沖區清零</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;//接收緩沖區清零</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;//波特率計算</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em">定義I2C串口2中斷優先級位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;//允許I2C功能</p><p style="TEXT-INDENT: 2em">_MI2C1IE = 1;//允許主設備中斷</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資料和全國供應商">EEPROM</a>讀塊函數(只能在回調函數I2CReadCallBack中得到讀出的數據)</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資料和全國供應商">EEPROM</a>寫塊函數</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">用戶讀回調函數</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);//繼續讀</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">/*------------------------------------------------------------------</p><p style="TEXT-INDENT: 2em">用戶寫回調函數</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);//繼續寫</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資料和全國供應商">EEPROM</a>讀寫啟動函數</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">//本程序在狀態I2C_MT_ADDRL_ACK下進行瞬間打開,也可在此打開，不過安全不好</p><p style="TEXT-INDENT: 2em">if (I2CRegs.TxCount)//需要寫入字節</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">WP = 0;//不寫保護</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;//寫保護</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;//主機準備發送啟始位</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//發送數據個數</p><p style="TEXT-INDENT: 2em">I2CBits.I2CFlag = 0;</p><p style="TEXT-INDENT: 2em">I2C1CONbits.SEN = 1;//發送Start信號</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資料和全國供應商">EEPROM</a>讀再啟動函數</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;//主機準備發送重新啟始位</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//發送數據個數</p><p style="TEXT-INDENT: 2em">I2C1CONbits.RSEN = 1;//發送ReStart信號</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資料和全國供應商">EEPROM</a>讀寫正確停止函數</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;//通訊成功</p><p style="TEXT-INDENT: 2em">I2C1CONbits.PEN = 1;//發送Stop信號</p><p style="TEXT-INDENT: 2em">WP = 1;//寫保護</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資料和全國供應商">EEPROM</a>讀寫錯誤退出函數</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;//發送Stop信號</p><p style="TEXT-INDENT: 2em">WP = 1;//寫保護</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資料和全國供應商">EEPROM</a>讀寫中斷事件處理函數(說明見文件頭部)</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過信號</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資料和全國供應商">switch</a> (I2CRegs.State)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">case I2C_START://收到Start信號</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.I2CAddr &amp; 0xfe;//發送器件寫地址(通知從機只能聽)</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_SLA_ACK;//下次應該接收器件寫地址應答信號</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MT_SLA_ACK://收到器件寫地址應答信號</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信號</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資料和全國供應商">EEPROM</a>容量超過256個字節,<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>地址需要兩次發送</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.RWAddr &gt;&gt; 8;//發送<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>寫高8位地址</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_ADDRH_ACK;//下次應該接收<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>寫高8位地址應答信號</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//小容量只需一次發送!!!</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.RWAddr;//發送<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>寫低8位地址</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_ADDRL_ACK;//下次應該接收<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>寫低8位地址應答信號</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//清空發送緩沖計數器</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信號</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤的ACK信號</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資料和全國供應商">EEPROM</a>寫高8位地址應答信號</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信號</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.RWAddr &amp; 0xff;//發送<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>寫低8位地址</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MT_ADDRL_ACK;//下次應該接收<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>寫低8位地址應答信號</p><p style="TEXT-INDENT: 2em">I2CRegs.Count = 0;//清空發送緩沖計數器</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信號</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤的ACK信號</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資料和全國供應商">EEPROM</a>寫高低8位地址應答信號</p><p style="TEXT-INDENT: 2em">if (I2CRegs.TxCount)//寫保護只在寫入期間不保護，增加了對誤寫入的安全防護能力!!!</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">WP = 0;//不寫保護</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">case I2C_MT_DATA_ACK://收到應答信號</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信號</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.Count &lt; I2CRegs.TxCount)//緩沖區未空</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.TxBuffer[I2CRegs.Count ++];//繼續發送數據</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else if (I2CRegs.Count == I2CRegs.TxCount)//緩沖區已空</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.I2CAddr &amp; 1)//應該開始接收數據</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cReStart();//發送重復位命令</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//只寫退出</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cStop();//正常發送結束</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//干擾出錯</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信號(可能被寫保護)</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤的ACK信號</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信號</p><p style="TEXT-INDENT: 2em">I2C1TRN = I2CRegs.I2CAddr | I2C_READ;//發送器件讀地址(通知從機可以說話)</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_SLA_ACK;//下次應該接收器件寫讀地址應答信號</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_SLA_ACK://收到器件讀地址應答信號</p><p style="TEXT-INDENT: 2em">if (!I2C1STATbits.ACKSTAT)//收到Ack信號</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2C1CONbits.RCEN = 1;//開始接收數據</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA;//下次應該收接收數據</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//收到NAck信號</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤的ACK信號</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_DATA://收到接收數據</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;//應答子機</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA_EN;//下次應該收到器件允許繼續讀信號</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;//非應答子機</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA_STOP;//下次應該收到退出信號</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">I2C1CONbits.ACKEN = 1;//向從機發送(非)應答信號</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//正確的狀態已分支到I2C_MR_DATA_STOP</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_DATA_EN://收到器件允許繼續讀信號</p><p style="TEXT-INDENT: 2em">I2C1CONbits.RCEN = 1;//開始接收數據</p><p style="TEXT-INDENT: 2em">I2CRegs.State = I2C_MR_DATA;//下次應該繼續接收數據</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">case I2C_MR_DATA_STOP://收到器件退出信號</p><p style="TEXT-INDENT: 2em">I2cStop();//正常接收結束</p><p style="TEXT-INDENT: 2em">break;</p><p style="TEXT-INDENT: 2em">default://其他不可預料的錯誤</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤</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信號</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.State == I2C_SUCCEEDED)//成功,回調</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">if (I2CRegs.I2CAddr &amp; 1)//讀</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CBits.ReadFlag = 1;//激活用戶讀回調函數I2CReadCallBack()</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">else//寫</p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2CBits.WriteFlag = 1;//激活用戶寫回調函數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//無法確認的復雜錯誤 </p><p style="TEXT-INDENT: 2em">{</p><p style="TEXT-INDENT: 2em">I2cExit();//錯誤出錯退出</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">}</p><p style="TEXT-INDENT: 2em">下附I2CReadBuffers(0, 10)結果圖</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">回復1</font>&nbsp;&nbsp;對應的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本程序是讀寫鐵電的，故速度很高</p><p style="TEXT-INDENT: 2em">//下面的是I2C的標準狀態表,因為PIC的不標準,故湊合著用和補充了加注解的部分~~~</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資料和全國供應商">Master</a> */</p><p style="TEXT-INDENT: 2em">I2C_START =0x08,//啟動</p><p style="TEXT-INDENT: 2em">I2C_REP_START=0x10,//重啟動</p><p style="TEXT-INDENT: 2em">/* <a href="http://www.ic37.com/Master-p.htm" target="_blank" title="Master PDF資料和全國供應商">Master</a> Transmitter */</p><p style="TEXT-INDENT: 2em">I2C_MT_SLA_ACK=0x18,//主發模式下得到從機地址應答信號</p><p style="TEXT-INDENT: 2em">I2C_MT_SLA_NACK=0x20,</p><p style="TEXT-INDENT: 2em">I2C_MT_DATA_ACK=0x28,//主發模式下得到從機數據應答信號</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資料和全國供應商">Master</a> <a href="http://www.ic37.com/Receiver-p.htm" target="_blank" title="Receiver PDF資料和全國供應商">Receiver</a> */</p><p style="TEXT-INDENT: 2em">I2C_MR_ARB_LOST=0x38,</p><p style="TEXT-INDENT: 2em">I2C_MR_SLA_ACK=0x40,//主收模式下得到從機地址應答信號</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資料和全國供應商">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,//主發模式下得到從機高位<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>地址應答信號</p><p style="TEXT-INDENT: 2em">I2C_MT_ADDRL_ACK=0x3b,//主發模式下得到從機高低位<a href="http://www.ic37.com/EEPROM-p.htm" target="_blank" title="EEPROM PDF資料和全國供應商">EEPROM</a>地址應答信號</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA=0x5a,//主收模式下接收數據</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA_EN=0x5b,//主收模式下使能接收數據功能</p><p style="TEXT-INDENT: 2em">I2C_MR_DATA_STOP=0x5c,//主收模式下接收數據完成</p><p style="TEXT-INDENT: 2em">I2C_FAILED=0xcc,//讀寫操作失敗</p><p style="TEXT-INDENT: 2em">I2C_SUCCEEDED=0x00,//讀寫操作成功</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開漏控制</p><p style="TEXT-INDENT: 2em">#define ODC_SDA1 _ODG3 //SDA開漏控制</p><p style="TEXT-INDENT: 2em">/*-----------------------------------------</p><p style="TEXT-INDENT: 2em">寫保護管腳定義,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//寫保護</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;//忙標志</p><p style="TEXT-INDENT: 2em">unsigned charReadFlag:1;//讀回調標志</p><p style="TEXT-INDENT: 2em">unsigned charWriteFlag:1;//寫回調標志</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;//運行狀態編碼</p><p style="TEXT-INDENT: 2em">unsigned char I2CAddr;//器件地址0xa1,0xa0</p><p style="TEXT-INDENT: 2em">unsigned int RWAddr;//器件讀寫地址(自動根據MaxCount判斷長短地址)</p><p style="TEXT-INDENT: 2em">unsigned int Count;//運行計數器</p><p style="TEXT-INDENT: 2em">unsigned int TxCount;//發送(寫)個數</p><p style="TEXT-INDENT: 2em">unsigned int RxCount;//接收(讀)個數</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];//發送緩沖區</p><p style="TEXT-INDENT: 2em">unsigned char RxBuffer[256];//接收緩沖區</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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?? 文件大小 111 K
?? 上傳用戶 Tonic2009
?? 所屬分類其他嵌入式/單片機內容
??? 相關標簽

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