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	 > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > Freescale 9S12 系列單片機(jī)應(yīng)用筆記（SCI）1
            
    
            

            

            


	
	
	

            
	
            
		
            
			
            Freescale 9S12 系列單片機(jī)應(yīng)用筆記（SCI）1
            
						
            
				作者：
				時間：2016-11-20
				來源：網(wǎng)絡(luò)
				
				
				
				
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            SCI模塊應(yīng)用筆記（1）
            UART，也就是異步串行通訊接口是單片機(jī)中最常見的外設(shè)，幾乎每種類型的單片機(jī)都必備1到2個UART接口，9S12系列單片機(jī)也不例外。不過，摩托羅拉給他自己的單片機(jī)的串口起了個很有個性的縮寫名稱SCI（serialcommunicationinterface），其實(shí)就是我們常說的UART。
            本文引用地址：http://www.biyoush.com/article/201611/318823.htm
            各種單片機(jī)串口的編程都大同小異，無非就是設(shè)置波特率、起始位、停止位、校驗(yàn)位等等。下面通過給出編程例子的方式分別介紹。
            設(shè)置波特率
            1. /**
            2. *SettheBaudRateoftheSCI.
            3. *@paramport,portcanbeSCI0/SCI1
            4. *@parambaudRate,thewantedbaudrate.
            5. *@parambusClk,TheSCImoduleclock.
            6. */
            7. voidSCISetBaudRate(unsignedcharport,unsignedlongbaudRate,unsignedlongbusClk)
            8. {
            9. unsignedshortbaudRateReg;
            10. baudRateReg=(unsignedshort)(busClk/baudRate/16);
            11. if(port==SCI0)
            12. {
            13. //HerewemustwriteBDHfirst!
            14. SCI0BDH=(0x1f&(baudRateReg>>8));
            15. SCI0BDL=(0xff&baudRateReg);
            16. }
            17. elseif(port==SCI1)
            18. {
            19. SCI1BDH=(0x1f&(baudRateReg>>8));
            20. SCI1BDL=(0xff&baudRateReg);
            21. }
            22. else
            23. {
            24. //Somethingmustgowrong.Donothinghere!
            25. }
            26. }
            設(shè)置奇偶校驗(yàn)位
            1. /**
            2. *Enable/DisableparityfunctionandsettheParitytype
            3. *@paramportportcanbeSCI0/SCI1
            4. *@paramisEnable0fordisableparityfunction,1forenable
            5. *@paramtype0forEvenParity,1forOddParity
            6. */
            7. voidSCISetParity(unsignedcharport,unsignedcharisEnable,unsignedchartype)
            8. {
            9. if(port==SCI0)
            10. {
            11. SCI0CR1_PE=(isEnable&0x01);
            12. SCI0CR1_PT=(type&0x01);
            13. }
            14. elseif(port==SCI1)
            15. {
            16. SCI1CR1_PE=(isEnable&0x01);
            17. SCI1CR1_PT=(type&0x01);
            18. }
            19. else
            20. {
            21. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            22. }
            24. }

            使能數(shù)據(jù)位的長度
            1. /**
            2. *SettheDataFormatModeBit
            3. *@paramportportcanbeSCI0/SCI1
            4. *@parambitsmustbe8or9
            5. */
            6. voidSCISetDataBit(unsignedcharport,unsignedcharbits)
            7. {
            8. if(port==SCI0)
            9. {
            10. switch(bits)
            11. {
            12. case8:
            13. SCI0CR1_M=0;/*1startbit,8databits,1stopbit*/
            14. break;
            15. case9:
            16. SCI0CR1_M=1;/*1startbit,9databits,1stopbit*/
            17. break;
            18. default:
            19. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            20. break;
            21. }
            22. }
            23. elseif(port==SCI1)
            24. {
            25. switch(bits)
            26. {
            27. case8:
            28. SCI1CR1_M=0;/*1startbit,8databits,1stopbit*/
            29. break;
            30. case9:
            31. SCI1CR1_M=1;/*1startbit,9databits,1stopbit*/
            32. break;
            33. default:
            34. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            35. break;
            36. }
            37. }
            38. else
            39. {
            40. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            41. }
            43. }

            設(shè)置串口的工作模式
            NORMAL_MODE是我們通常用的模式
            LOOP_MODE是自發(fā)自收模式
            SING_WIRE_MODE就是收發(fā)公用一條數(shù)據(jù)線的模式
            1. /**
            2. *Settheworkmodeofoperation
            3. *@paramportportcanbeSCI0/SCI1
            4. *@parammodemodecanbeNORMAL_MODE/LOOP_MODE/SING_WIRE_MODE
            5. */
            6. voidSCISetWorkMode(unsignedcharport,unsignedcharmode)
            7. {
            8. if(port==SCI0)
            9. {
            10. switch(mode)
            11. {
            12. caseNORMAL_MODE:
            13. SCI0CR1_LOOPS=0;
            14. SCI0CR1_RSRC=0;
            15. break;
            16. caseLOOP_MODE:
            17. SCI0CR1_LOOPS=1;
            18. SCI0CR1_RSRC=0;
            19. break;
            20. caseSING_WIRE_MODE:
            21. SCI0CR1_LOOPS=1;
            22. SCI0CR1_RSRC=1;
            23. break;
            24. default:
            25. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            26. break;
            27. }
            28. }
            29. elseif(port==SCI1)
            30. {
            31. switch(mode)
            32. {
            33. caseNORMAL_MODE:
            34. SCI1CR1_LOOPS=0;
            35. SCI1CR1_RSRC=0;
            36. break;
            37. caseLOOP_MODE:
            38. SCI1CR1_LOOPS=1;
            39. SCI1CR1_RSRC=0;
            40. break;
            41. caseSING_WIRE_MODE:
            42. SCI1CR1_LOOPS=1;
            43. SCI1CR1_RSRC=1;
            44. break;
            45. default:
            46. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            47. break;
            48. }
            49. }
            50. else
            51. {
            52. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            53. }
            54. }
            設(shè)置SCI模塊是否在Wait模式下工作
            1. /**
            2. *Enable/DisabletheSCIinwaitmode
            3. *@paramportportcanbeSCI0/SCI1
            4. *@parammodemodecanbeRUN_MODE/WAIT_MODE
            5. */
            6. voidSCISetPowerMode(unsignedcharport,unsignedcharmode)
            7. {
            8. if(port==SCI0)
            9. {
            10. switch(mode)
            11. {
            12. caseRUN_MODE:
            13. SCI0CR1_SCISWAI=0;
            14. break;
            15. caseWAIT_MODE:
            16. SCI0CR1_SCISWAI=1;
            17. break;
            18. default:
            19. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            20. break;
            21. }
            22. }
            23. elseif(port==SCI1)
            24. {
            25. switch(mode)
            26. {
            27. caseRUN_MODE:
            28. SCI1CR1_SCISWAI=0;
            29. break;
            30. caseWAIT_MODE:
            31. SCI1CR1_SCISWAI=1;
            32. break;
            33. default:
            34. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            35. break;
            36. }
            37. }
            38. else
            39. {
            40. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            41. }
            42. }
            使能SCI模塊的接收功能
            1. /**
            2. *Enable/DisableSCIReceiver
            3. *@paramportportcanbeSCI0/SCI1
            4. *@paramisEnable0disable1enable
            5. */
            6. voidSCIEnableRecv(unsignedcharport,unsignedcharisEnable)
            7. {
            8. if(port==SCI0)
            9. {
            10. SCI0CR2_RE=(isEnable&0x01);
            11. }
            12. elseif(port==SCI1)
            13. {
            14. SCI1CR2_RE=(isEnable&0x01);
            15. }
            16. else
            17. {
            18. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            19. }
            20. }
            使能SCI模塊的發(fā)送功能
            1. /**
            2. *Enable/DisableSCITransmitter
            3. *@paramportportcanbeSCI0/SCI1
            4. *@paramisEnable0disable1enable
            5. */
            6. voidSCIEnableTrans(unsignedcharport,unsignedcharisEnable)
            7. {
            8. if(port==SCI0)
            9. {
            10. SCI0CR2_TE=(isEnable&0x01);
            11. }
            12. elseif(port==SCI1)
            13. {
            14. SCI1CR2_TE=(isEnable&0x01);
            15. }
            16. else
            17. {
            18. //Ifcoderunhere,somethingmustgowrong.Donothinghere!
            19. }
            20. }
            發(fā)送數(shù)據(jù)
            1. /**
            2. *SendacharthrounghSCImodule.
            3. *@paramportportcanbeSCI0/SCI1
            4. *@paramsthedatatobesent
            5. */
            6. voidSCIPutChar(unsignedcharport,unsignedchars)
            7. {
            8. if(port==SCI0)
            9. {
            10. while(SCI0SR1_TDRE==0);//SCI0SR1_TC是發(fā)送完成
            11. SCI0DRL=s;
            12. }
            13. else
            14. {
            15. while(SCI1SR1_TDRE==0);//SCI1SR1_TC
            16. SCI1DRL=s;
            17. }
            18. }
            20. /**
            21. *SendacharstringthrounghSCImodule.
            22. *@paramportportcanbeSCI0/SCI1
            23. *@param*strthestringtobesent
            24. */
            25. voidSCIPutStr(unsignedcharport,unsignedchar*str)
            26. {
            27. while(0!=*str)
            28. {
            29. SCIPutChar(port,*str);
            30. str++;
            31. }
            32. }
            34. /**
            35. *SenddatathrounghSCImodule.
            36. *@paramportportcanbeSCI0/SCI1
            37. *@param*ppointertothedatatobesent
            38. *@paramsizethesize(byte)ofthedata
            39. */
            40. voidSCIWrite(unsignedcharport,void*p,intsize)
            41. {
            42. unsignedchar*str=(unsignedchar*)p;
            43. while(size>0)
            44. {
            45. SCIPutChar(port,*str);
            46. str++;
            47. size--;
            48. }
            49. }
            51. /**
            52. *Sendashortintvalue(BigEndian)throunghSCImodule.
            53. *@paramportportcanbeSCI0/SCI1
            54. *@paramithedatatobesent
            55. */
            56. voidSCIPutShortBigEndian(unsignedcharport,shorti)
            57. {
            58. char*p=(char*)&i;
            59. SCIPutChar(port,p[0]);
            60. SCIPutChar(port,p[1]);
            61. }
            63. /**
            64. *Sendashortintvalue(LittleEndian)throunghSCImodule.
            65. *@paramportportcanbeSCI0/SCI1
            66. *@paramithedatatobesent
            67. */
            68. voidSCIPutShortLittleEndian(unsignedcharport,shorti)
            69. {
            70. char*p=(char*)&i;
            71. SCIPutChar(port,p[1]);
            72. SCIPutChar(port,p[0]);
            73. }
            75. /**
            76. *Sendalongintvalue(BigEndian)throunghSCImodule.
            77. *@paramportportcanbeSCI0/SCI1
            78. *@paramithedatatobesent
            79. */
            80. voidSCIPutLongBigEndian(unsignedcharport,longi)
            81. {
            82. char*p=(char*)&i;
            83. SCIPutChar(port,p[0]);
            84. SCIPutChar(port,p[1]);
            85. SCIPutChar(port,p[2]);
            86. SCIPutChar(port,p[3]);
            87. }
            89. /**
            90. *Sendalongintvalue(LittleEndian)throunghSCImodule.
            91. *@paramportportcanbeSCI0/SCI1
            92. *@paramithedatatobesent
            93. */
            94. voidSCIPutLongLittleEndian(unsignedcharport,longi)
            95. {
            96. char*p=(char*)&i;
            97. SCIPutChar(port,p[3]);
            98. SCIPutChar(port,p[2]);
            99. SCIPutChar(port,p[1]);
            100. SCIPutChar(port,p[0]);
            101. }

            接收數(shù)據(jù)
            1. /**
            2. *ReceiveachardatafromSCImodule,noreply.
            3. *@paramportportcanbeSCI0/SCI1
            4. *@returnthereceivedchar
            5. */
            6. unsignedcharSCIGetChar(unsignedcharport)
            7. {
            8. if(port==SCI0)
            9. {
            10. while(SCI0SR1_RDRF==0);
            11. returnSCI0DRL;
            12. }
            13. else
            14. {
            15. while(SCI1SR1_RDRF==0);
            16. returnSCI1DRL;
            17. }
            18. }

            相應(yīng)的頭文件
            1. /**
            2. *filesci.h
            3. *authorLiYuan
            4. *platform:mc9s12dp256B
            5. *date:2012-4-16
            6. *version:1.0.0
            7. *description:SCI(SerialCommunicationInterface)SupportCode
            8. */
            10. #ifndef_SCI_H_
            11. #define_SCI_H_
            14. #defineSCI00
            15. #defineSCI11
            17. #defineIDLE_LINE0
            18. #defineADDRESS_MARK1
            20. #defineNORMAL_MODE0
            21. #defineLOOP_MODE1
            22. #defineSING_WIRE_MODE2
            24. #defineRUN_MODE0
            25. #defineWAIT_MODE1
            27. /*FunctionDeclaration*/
            29. /**
            30. *SettheBaudRateoftheSCI.
            31. *@paramport,portcanbeSCI0/SCI1
            32. *@parambaudRate,thewantedbaudrate.
            33. *@parambusClk,TheSCImoduleclock.
            34. */
            35. voidSCISetBaudRate(unsignedcharport,unsignedlongbaudRate,unsignedlongbusClk);
            37. /**
            38. *SettheInterruptEnableBit
            39. *@paramportportcanbeSCI0/SCI1
            40. *@paramtieTransmitterInterruptEnableBIt
            41. *@paramtcieTransmissionCompleteInterruptEnableBIt
            42. *@paramrieReceiverFullInterruptEnableBIt
            43. *@paramilieIdleLineInterruptEnableBIt
            44. *0InterruptrequestsDisabled
            45. *1InterruptrequestsEnabled
            46. */
            47. voidSCISetIEBit(unsignedcharport,unsignedchartie,unsignedchartcie,unsignedcharrie,unsignedcharilie);
            49. /**
            50. *EnableTheTxinterrupt(TransmitterInterruptEnableBIt)
            51. *@paramport,portcanbeSCI0/SCI1
            52. */
            53. voidSCIEnableTxInt(unsignedcharport);
            55. /**
            56. *DisableTheTxinterrupt(TransmitterInterruptEnableBIt)
            57. *@paramport,portcanbeSCI0/SCI1
            58. */
            59. voidSCIDisTxInt(unsignedcharport);
            61. /**
            62. *Enable/DisableSCIReceiver
            63. *@paramportportcanbeSCI0/SCI1
            64. *@paramisEnable0disable1enable
            65. */
            66. voidSCIEnableRecv(unsignedcharport,unsignedcharisEnable);
            68. /**
            69. *Enable/DisableSCITransmitter
            70. *@paramportportcanbeSCI0/SCI1
            71. *@paramisEnable0disable1enable
            72. */
            73. voidSCIEnableTrans(unsignedcharport,unsignedcharisEnable);
            75. /**
            76. *SettheIdleLineType
            77. *@paramportportcanbeSCI0/SCI1
            78. *@paramtype0Idlecharbitcountbeginsafterstartbit
            79. *1Idlecharbitcountbeginsafterstopbit
            80. */
            81. voidSCISetIdleLineType(unsignedcharport,unsignedchartype);
            83. /**
            84. *SettheWakeupCondition.
            85. *@paramportportcanbeSCI0/SCI1
            86. *@paramcondi0forIdlelinewakeup,1foraddressmarkwakeup
            87. */
            88. voidSCISetWakeupCondi(unsignedcharport,unsignedcharcondi);
            90. /**
            91. *Enable/DisableparityfunctionandsettheParitytype
            92. *@paramportportcanbeSCI0/SCI1
            93. *@paramisEnable0fordisableparityfunction,1forenable
            94. *@paramtype0forEvenParity,1forOddParity
            95. */
            96. voidSCISetParity(unsignedcharport,unsignedcharisEnable,unsignedchartype);
            98. /**
            99. *SettheDataFormatModeBit
            100. *@paramportportcanbeSCI0/SCI1
            101. *@parambitsmustbe8or9
            102. */
            103. voidSCISetDataBit(unsignedcharport,unsignedcharbits);
            105. /**
            106. *Settheworkmodeofoperation
            107. *@paramportportcanbeSCI0/SCI1
            108. *@parammodemodecanbeNORMAL_MODE/LOOP_MODE/SING_WIRE_MODE
            109. */
            110. voidSCISetWorkMode(unsignedcharport,unsignedcharmode);
            112. /**
            113. *Enable/DisabletheSCIinwaitmode
            114. *@paramportportcanbeSCI0/SCI1
            115. *@parammodemodecanbeRUN_MODE/WAIT_MODE
            116. */
            117. voidSCISetPowerMode(unsignedcharport,unsignedcharmode);
            119. /**
            120. *SettheTXDIR(OnlyforSingleWireMODE)
            121. *@paramportportcanbeSCI0/SCI1
            122. *@paramdir0TXDusedasinput,1TXDusedasoutput
            123. */
            124. voidSCISetTXDIR(unsignedcharport,unsignedchardir);
            126. /**
            127. *SendacharthrounghSCImodule.
            128. *@paramportportcanbeSCI0/SCI1
            129. *@paramsthedatatobesent
            130. */
            131. voidSCIPutChar(unsignedcharport,unsignedchars);
            133. /**
            134. *ReceiveachardatafromSCImodule,noreply.
            135. *@paramportportcanbeSCI0/SCI1
            136. *@returnthereceivedchar
            137. */
            138. unsignedcharSCIGetChar(unsignedcharport);
            140. /**
            141. *Sendashortintvalue(BigEndian)throunghSCImodule.
            142. *@paramportportcanbeSCI0/SCI1
            143. *@paramithedatatobesent
            144. */
            145. voidSCIPutShortBigEndian(unsignedcharport,shorti);
            147. /**
            148. *Sendashortintvalue(LittleEndian)throunghSCImodule.
            149. *@paramportportcanbeSCI0/SCI1
            150. *@paramithedatatobesent
            151. */
            152. voidSCIPutShortLittleEndian(unsignedcharport,shorti);
            154. /**
            155. *Sendalongintvalue(BigEndian)throunghSCImodule.
            156. *@paramportportcanbeSCI0/SCI1
            157. *@paramithedatatobesent
            158. */
            159. voidSCIPutLongBigEndian(unsignedcharport,longi);
            161. /**
            162. *Sendalongintvalue(LittleEndian)throunghSCImodule.
            163. *@paramportportcanbeSCI0/SCI1
            164. *@paramithedatatobesent
            165. */
            166. voidSCIPutLongLittleEndian(unsignedcharport,longi);
            168. /**
            169. *SendacharstringthrounghSCImodule.
            170. *@paramportportcanbeSCI0/SCI1
            171. *@param*strthestringtobesent
            172. */
            173. voidSCIPutStr(unsignedcharport,unsignedchar*str);
            176. /**
            177. *SenddatathrounghSCImodule.
            178. *@paramportportcanbeSCI0/SCI1
            179. *@param*ppointertothedatatobesent
            180. *@paramsizethesize(byte)ofthedata
            181. */
            182. voidSCIWrite(unsignedcharport,void*p,intsize);
            184. #endif
            下面給個簡單的例子
            1. #include/*commondefinesandmacros*/
            2. #include"derivative.h"/*derivative-specificdefinitions*/
            3. #include"sci.h"
            5. voidmain(void)
            6. {
            7. charC;
            8. EnableInterrupts;
            10. SCISetWorkMode(SCI0,NORMAL_MODE);
            11. SCISetPowerMode(SCI0,RUN_MODE);
            12. SCISetBaudRate(SCI0,9600,16384000L);//16MClock
            13. SCISetDataBit(SCI0,8);
            14. SCISetParity(SCI0,0,0);
            15. SCIEnableRecv(SCI0,1);
            16. SCIEnableTrans(SCI0,1);
            18. for(;;)
            19. {
            20. _FEED_COP();/*feedsthedog*/
            21. C=SCIGetChar(SCI0);
            22. SCIPutChar(SCI0,C);
            23. }/*loopforever*/
            25. /*pleasemakesurethatyouneverleavemain*/
            26. }

            先寫這么多，剩下的明天繼續(xù)。下一篇筆記中將給出如何利用串口的收發(fā)中斷和環(huán)形緩沖區(qū)來實(shí)現(xiàn)較為完善的串口驅(qū)動。
            
				
            
                
			
							
            
                
			              
              
            
            
		
            
		
            
		
            
		
            
		
            
			
              
				
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