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	 > 嵌入式系統(tǒng) > 設計應用 > Freescale 9S12 系列單片機應用筆記（SCI）2
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          Freescale 9S12 系列單片機應用筆記（SCI）2
          
						
          
				作者：
				時間：2016-11-20
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			這里給個利用串口收發(fā)中斷的實現(xiàn).
          本文引用地址：http://www.ex-cimer.com/article/201611/318824.htm
          首先是頭文件:
          1. /*sci_buffered.h*/
          2. #ifndef_SCI_BUFFERED_H_
          3. #define_SCI_BUFFERED_H_
            #defineSCI_RX_BUF_SIZE64/*NumberofcharactersinRxringbuffer*/
          4. #defineSCI_TX_BUF_SIZE64/*NumberofcharactersinTxringbuffer*/
            #defineSCI_NO_ERR0/*Functioncallwassuccessful*/
          5. #defineSCI_BAD_CH1/*Invalidcommunicationsportchannel*/
          6. #defineSCI_RX_EMPTY2/*Rxbufferisempty,nocharacteravailable*/
          7. #defineSCI_TX_FULL3/*Txbufferisfull,couldnotdepositcharacter*/
          8. #defineSCI_TX_EMPTY4/*IftheTxbufferisempty.*/
          9. /**
          10. *Toobtainacharacterfromthecommunicationschannel.
          11. *@paramport,portcanbeSCI0/SCI1
          12. *@paramerr,isapointertowhereanerrorcodewillbeplaced:
          13. **errissettoSCI_NO_ERRifacharacterisavailable
          14. **errissettoSCI_RX_EMPTYiftheRxbufferisempty
          15. **errissettoSCI_BAD_CHifyouhavespecifiedaninvalidchannel
          16. *@returnThereceivedchariferr==SCI_NO_ERR
          17. */
          18. unsignedcharSCIGetCharB(unsignedcharport,unsignedchar*err);
            /**
          19. *Tosendacharacteronthecommunicationschannel.
          20. *ThecharactertosendisfirstinsertedintotheTxbufferandwillbesentby
          21. *theTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISRwillbe
          22. *enabled.IftheTxbufferisfull,thecharacterwillnotbesent(i.e.itwillbelost)
          23. *
          24. *@paramport,portcanbeSCI0/SCI1
          25. *@returnCOMM_NO_ERRifthefunctionwassuccessful(thebufferwasnotfull)
          26. *COMM_TX_FULLifthebufferwasfull
          27. *COMM_BAD_CHifyouhavespecifiedanincorrectchannel
          28. */
          29. unsignedcharSCIPutCharB(unsignedcharport,unsignedcharc);
            /**
          30. *Toinitializethecommunicationsmodule.
          31. *Youmustcallthisfunctionbeforecallinganyotherfunctions.
          32. */
          33. voidSCIBufferInit(void);
            /**
          34. *Toseeifanycharacterisavailablefromthecommunicationschannel.
          35. *
          36. *@paramport,portcanbeSCI0/SCI1
          37. *@returnIfatleastonecharacterisavailable,thefunctionreturns
          38. *FALSE(0)otherwise,thefunctionreturnsTRUE(1).
          39. */
          40. unsignedcharSCIBufferIsEmpty(unsignedcharport);
            /**
          41. *ToseeifanymorecharacterscanbeplacedintheTxbuffer.
          42. *Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
          43. *
          44. *@paramport,portcanbeSCI0/SCI1
          45. *@returnIfthebufferisfull,thefunctionreturnsTRUE
          46. *otherwise,thefunctionreturnsFALSE.
          47. */
          48. unsignedcharSCIBufferIsFull(unsignedcharport);
            #endif
          然后 是 c 文件.
          1. /**
          2. *SCI(SerialCommunicationInterface)BufferedSerialI/O
          3. *@filesci_buffered.c
          4. *@authorLiYuan
          5. *@platformmc9s12XX
          6. *@date2012-7-22
          7. *@version1.0.1
          8. */
          9. #include"derivative.h"/*derivative-specificdefinitions*/
          10. #include
          11. #include"sci.h"
          12. #include"sci_buffered.h"
            //#defineOS_ENTER_CRITICAL()_asm("pshc;sei")
          13. //#defineOS_EXIT_CRITICAL()_asm("pulc")
            #defineOS_ENTER_CRITICAL()_asm("tpa;sei;staacpu_sr")
          14. #defineOS_EXIT_CRITICAL()_asm("ldaacpu_sr;tap")
            /**
          15. *DATATYPES
          16. */
          17. typedefstruct{
          18. shortRingBufRxCtr;/*NumberofcharactersintheRxringbuffer*/
          19. unsignedchar*RingBufRxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
          20. unsignedchar*RingBufRxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
          21. unsignedcharRingBufRx[SCI_RX_BUF_SIZE];/*Ringbuffercharacterstorage(Rx)*/
          22. shortRingBufTxCtr;/*NumberofcharactersintheTxringbuffer*/
          23. unsignedchar*RingBufTxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
          24. unsignedchar*RingBufTxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
          25. unsignedcharRingBufTx[SCI_TX_BUF_SIZE];/*Ringbuffercharacterstorage(Tx)*/
          26. }SCI_RING_BUF;
            /**
          27. *GLOBALVARIABLES
          28. */
            SCI_RING_BUFSCI0Buf;
          29. SCI_RING_BUFSCI1Buf;
          30. /**
          31. *Toobtainacharacterfromthecommunicationschannel.
          32. *@paramport,portcanbeSCI0/SCI1
          33. *@paramerr,isapointertowhereanerrorcodewillbeplaced:
          34. **errissettoSCI_NO_ERRifacharacterisavailable
          35. **errissettoSCI_RX_EMPTYiftheRxbufferisempty
          36. **errissettoSCI_BAD_CHifyouhavespecifiedaninvalidchannel
          37. *@returnThereceivedchariferr==SCI_NO_ERR
          38. */
          39. unsignedcharSCIGetCharB(unsignedcharport,unsignedchar*err)
          40. {
          41. unsignedcharcpu_sr;
          43. unsignedcharc;
          44. SCI_RING_BUF*pbuf;
          46. /*Obtainpointertocommunicationschannel*/
          47. switch(port)
          48. {
          49. caseSCI0:
          50. pbuf=&SCI0Buf;
          51. break;
            caseSCI1:
          52. pbuf=&SCI1Buf;
          53. break;
            default:
          54. *err=SCI_BAD_CH;
          55. return(0);
          56. }
          57. OS_ENTER_CRITICAL();
          58. if(pbuf->RingBufRxCtr>0)/*Seeifbufferisempty*/
          59. {
          60. pbuf->RingBufRxCtr--;/*No,decrementcharactercount*/
          61. c=*pbuf->RingBufRxOutPtr++;/*Getcharacterfrombuffer*/
          62. if(pbuf->RingBufRxOutPtr==&pbuf->RingBufRx[SCI_RX_BUF_SIZE])
          63. {
          64. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];/*WrapOUTpointer*/
          65. }
          66. OS_EXIT_CRITICAL();
          67. *err=SCI_NO_ERR;
          68. return(c);
          69. }
          70. else
          71. {
          72. OS_EXIT_CRITICAL();
          73. *err=SCI_RX_EMPTY;
          74. c=0;/*Bufferisempty,return0*/
          75. return(c);
          76. }
          77. }
          78. /**
          79. *Tosendacharacteronthecommunicationschannel.
          80. *ThecharactertosendisfirstinsertedintotheTxbufferandwillbesentby
          81. *theTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISRwillbe
          82. *enabled.IftheTxbufferisfull,thecharacterwillnotbesent(i.e.itwillbelost)
          83. *
          84. *@paramport,portcanbeSCI0/SCI1
          85. *@returnCOMM_NO_ERRifthefunctionwassuccessful(thebufferwasnotfull)
          86. *COMM_TX_FULLifthebufferwasfull
          87. *COMM_BAD_CHifyouhavespecifiedanincorrectchannel
          88. */
          89. unsignedcharSCIPutCharB(unsignedcharport,unsignedcharc)
          90. {
          91. unsignedcharcpu_sr;
          93. SCI_RING_BUF*pbuf;
          95. /*Obtainpointertocommunicationschannel*/
          96. switch(port)
          97. {
          98. caseSCI0:
          99. pbuf=&SCI0Buf;
          100. break;
            caseSCI1:
          101. pbuf=&SCI1Buf;
          102. break;
            default:
          103. return(SCI_BAD_CH);
          104. }
            OS_ENTER_CRITICAL();
          105. if(pbuf->RingBufTxCtr
          106. {
          107. pbuf->RingBufTxCtr++;/*No,incrementcharactercount*/
          108. *pbuf->RingBufTxInPtr++=c;/*Putcharacterintobuffer*/
          109. if(pbuf->RingBufTxInPtr==&pbuf->RingBufTx[SCI_TX_BUF_SIZE])
          110. {
          111. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];/*WrapINpointer*/
          112. }
          113. if(pbuf->RingBufTxCtr==1)
          114. {/*Seeifthisisthefirstcharacter*/
          115. SCIEnableTxInt(port);/*Yes,EnableTxinterrupts*/
          116. OS_EXIT_CRITICAL();
          117. }
          118. else
          119. {
          120. OS_EXIT_CRITICAL();
          121. }
          122. return(SCI_NO_ERR);
          123. }
          124. else
          125. {
          126. OS_EXIT_CRITICAL();
          127. return(SCI_TX_FULL);
          128. }
          129. }
            /**
          130. *Toinitializethecommunicationsmodule.
          131. *Youmustcallthisfunctionbeforecallinganyotherfunctions.
          132. */
          133. voidSCIBufferInit(void)
          134. {
          135. SCI_RING_BUF*pbuf;
          137. /*InitializetheringbufferforSCI0*/
          138. pbuf=&SCI0Buf;
          139. pbuf->RingBufRxCtr=0;
          140. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          141. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
          142. pbuf->RingBufTxCtr=0;
          143. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
          144. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
          146. /*InitializetheringbufferforSCI1*/
          147. pbuf=&SCI1Buf;
          148. pbuf->RingBufRxCtr=0;
          149. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          150. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
          151. pbuf->RingBufTxCtr=0;
          152. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
          153. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
          154. }
          155. /**
          156. *Toseeifanycharacterisavailablefromthecommunicationschannel.
          157. *
          158. *@paramport,portcanbeSCI0/SCI1
          159. *@returnIfatleastonecharacterisavailable,thefunctionreturns
          160. *FALSE(0)otherwise,thefunctionreturnsTRUE(1).
          161. */
          162. unsignedcharSCIBufferIsEmpty(unsignedcharport)
          163. {
          164. unsignedcharcpu_sr;
          165. unsignedcharempty;
          166. SCI_RING_BUF*pbuf;
          168. /*Obtainpointertocommunicationschannel*/
          169. switch(port)
          170. {
          171. caseSCI0:
          172. pbuf=&SCI0Buf;
          173. break;
            caseSCI1:
          174. pbuf=&SCI1Buf;
          175. break;
            default:
          176. return(1);
          177. }
          178. OS_ENTER_CRITICAL();
          179. if(pbuf->RingBufRxCtr>0)/*Seeifbufferisempty*/
          180. {
          181. empty=0;/*BufferisNOTempty*/
          182. }
          183. else
          184. {
          185. empty=1;/*Bufferisempty*/
          186. }
          187. OS_EXIT_CRITICAL();
          188. return(empty);
          189. }
          190. /**
          191. *ToseeifanymorecharacterscanbeplacedintheTxbuffer.
          192. *Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
          193. *
          194. *@paramport,portcanbeSCI0/SCI1
          195. *@returnIfthebufferisfull,thefunctionreturnsTRUE
          196. *otherwise,thefunctionreturnsFALSE.
          197. */
          198. unsignedcharSCIBufferIsFull(unsignedcharport)
          199. {
          200. unsignedcharcpu_sr;
          202. charfull;
          203. SCI_RING_BUF*pbuf;
          205. /*Obtainpointertocommunicationschannel*/
          206. switch(port)
          207. {
          208. caseSCI0:
          209. pbuf=&SCI0Buf;
          210. break;
            caseSCI1:
          211. pbuf=&SCI1Buf;
          212. break;
            default:
          213. return(1);
          214. }
          215. OS_ENTER_CRITICAL();
          216. if(pbuf->RingBufTxCtr
          217. {/*Seeifbufferisfull*/
          218. full=0;/*BufferisNOTfull*/
          219. }
          220. else
          221. {
          222. full=1;/*Bufferisfull*/
          223. }
          224. OS_EXIT_CRITICAL();
          225. return(full);
          226. }
          227. //ThisfunctioniscalledbytheRxISRtoinsertacharacterintothereceiveringbuffer.
          228. staticvoidSCIPutRxChar(unsignedcharport,unsignedcharc)
          229. {
          230. SCI_RING_BUF*pbuf;
          231. /*Obtainpointertocommunicationschannel*/
          232. switch(port)
          233. {
          234. caseSCI0:
          235. pbuf=&SCI0Buf;
          236. break;
            caseSCI1:
          237. pbuf=&SCI1Buf;
          238. break;
            default:
          239. return;
          240. }
          241. if(pbuf->RingBufRxCtr
          242. {
          243. pbuf->RingBufRxCtr++;/*No,incrementcharactercount*/
          244. *pbuf->RingBufRxInPtr++=c;/*Putcharacterintobuffer*/
          245. if(pbuf->RingBufRxInPtr==&pbuf->RingBufRx[SCI_RX_BUF_SIZE])
          246. {/*WrapINpointer*/
          247. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          248. }
          249. }
          250. }
          251. //ThisfunctioniscalledbytheTxISRtoextractthenextcharacterfromtheTxbuffer.
          252. //ThefunctionreturnsFALSEifthebufferisemptyafterthecharacterisextractedfrom
          253. //thebuffer.ThisisdonetosignaltheTxISRtodisableinterruptsbecausethisisthe
          254. //lastcharactertosend.
          255. staticunsignedcharSCIGetTxChar(unsignedcharport,unsignedchar*err)
          256. {
          257. unsignedcharc;
          258. SCI_RING_BUF*pbuf;
            switch(port)
          259. {
          260. caseSCI0:
          261. pbuf=&SCI0Buf;
          262. break;
            caseSCI1:
          263. pbuf=&SCI1Buf;
          264. break;
            default:
          265. *err=SCI_BAD_CH;
          266. return(0);
          267. }
          269. /*Seeifbufferisempty*/
          270. if(pbuf->RingBufTxCtr>0)
          271. {
          272. pbuf->RingBufTxCtr--;/*No,decrementcharactercount*/
          273. c=*pbuf->RingBufTxOutPtr++;/*Getcharacterfrombuffer*/
          274. if(pbuf->RingBufTxOutPtr==&pbuf->RingBufTx[SCI_TX_BUF_SIZE])
          275. {
          276. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];/*WrapOUTpointer*/
          277. }
          278. *err=SCI_NO_ERR;
          279. return(c);/*Charactersarestillavailable*/
          280. }else{
          281. *err=SCI_TX_EMPTY;
          282. return(0);/*Bufferisempty*/
          283. }
          284. }
          285. interruptVectorNumber_Vsci0voidSCI0_ISR(void)
          286. {
          287. charstatus;
          288. unsignedchardata;
          289. unsignedcharerr;
          290. status=SCI0SR1;
          292. if(status&0x0F)//0x1F=00011111,ifstatusisnotReceiveDataRegFullFlag
          293. {
          294. //Seeifwehavesomekindoferror
          295. //Clearinterrupt(donothingaboutit!)
          296. data=SCI0DRL;
          297. }
          298. elseif(status&0x20)//ReceiveDataRegFullFlag
          299. {
          300. data=SCI0DRL;
          301. SCIPutRxChar(SCI0,data);//Insertreceivedcharacterintobuffer
          302. }
          303. elseif(status&0x80)
          304. {
          305. data=SCIGetTxChar(SCI0,&err);//Getnextcharactertosend.
          306. if(err==SCI_TX_EMPTY)
          307. {//Dowehaveanymorecharacterstosend?
          308. //No,DisableTxinterrupts
          309. SCI0CR2_SCTIE=0;
          310. SCI0CR2_TCIE=0;
          311. }
          312. else
          313. {
          314. SCI0DRL=data;//Yes,Sendcharacter
          315. }
          316. }
          317. }
            interruptVectorNumber_Vsci1voidSCI1_ISR(void)
          318. {
          319. charstatus;
          320. unsignedchardata;
          321. unsignedcharerr;
          322. status=SCI1SR1;
          324. if(status&0x0F)//0x1F=00011111,ifstatusisnotReceiveDataRegFullFlag
          325. {
          326. //Seeifwehavesomekindoferror
          327. //Clearinterrupt(donothingaboutit!)
          328. data=SCI1DRL;
          329. }
          330. elseif(status&0x20)//ReceiveDataRegFullFlag
          331. {
          332. data=SCI1DRL;
          333. SCIPutRxChar(SCI1,data);//Insertreceivedcharacterintobuffer
          334. }
          335. elseif(status&0x80)
          336. {
          337. data=SCIGetTxChar(SCI1,&err);//Getnextcharactertosend.
          338. if(err==SCI_TX_EMPTY)
          339. {//Dowehaveanymorecharacterstosend?
          340. //No,DisableTxinterrupts
          341. SCI1CR2_SCTIE=0;
          342. SCI1CR2_TCIE=0;
          343. }
          344. else
          345. {
          346. SCI1DRL=data;//Yes,Sendcharacter
          347. }
          348. }
          349. }

          最后給個例子說明用法:

          1. #include/*commondefinesandmacros*/
          2. #include"derivative.h"/*derivative-specificdefinitions*/
          3. #include"sci.h"
          4. #include"sci_buffered.h"
          6. voidmain(void)
          7. {
          8. /*putyourowncodehere*/
          9. unsignedcharC,err;
          10. longl=0x1234L;
          11. inti=0x5678;
          12. CRGInit();
          13. SCIInit(SCI0);
          14. SCIInit(SCI1);
          15. SCIBufferInit();
          16. SCISetIEBit(SCI0,SCI_RIE);
          17. SCISetIEBit(SCI1,SCI_RIE);
            EnableInterrupts;
          18. SCIPutShortBigEndian(SCI1,i);
          19. SCIPutShortLittleEndian(SCI1,i);
          21. SCIPutLongBigEndian(SCI1,l);
          22. SCIPutLongLittleEndian(SCI1,l);
          23. for(;;)
          24. {
          25. _FEED_COP();/*feedsthedog*/
          26. C=SCIGetCharB(SCI1,&err);
          27. if(err==SCI_NO_ERR)
          28. {
          29. SCIPutCharB(SCI1,C);
          30. }
          31. }/*loopforever*/
          32. /*pleasemakesurethatyouneverleavemain*/
          33. }
          34. 例子很簡單，就不多解釋了。
          下一篇介紹在實時操作系統(tǒng) uC/OS-II 上實現(xiàn)串口驅(qū)動。
          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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