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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(shí)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(gè)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(gè)很有個(gè)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.ex-cimer.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(zhǎng)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(gè)簡(jiǎn)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(dòng)。
          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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