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	 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > Freescale 9S12 系列單片機應(yīng)用筆記（SCI）3
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          Freescale 9S12 系列單片機應(yīng)用筆記（SCI）3
          
						
          
				作者：
				時間：2016-11-20
				來源：網(wǎng)絡(luò)
				
				
				
				
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			這次介紹如何在 uC/OS-II 上實現(xiàn)串口驅(qū)動。

          本文引用地址：http://www.ex-cimer.com/article/201611/318825.htm
          1. /*sci_ucos.h*/
          2. #ifndef_SCI_RTOS_H_
          3. #define_SCI_RTOS_H_
            #defineSCI_RX_BUF_SIZE64/*NumberofcharactersinRxringbuffer*/
          4. #defineSCI_TX_BUF_SIZE64/*NumberofcharactersinTxringbuffer*/
            /*
          5. *********************************************************************************************************
          6. *CONSTANTS
          7. *********************************************************************************************************
          8. */
            #ifndefNUL
          9. #defineNUL0x00
          10. #endif
            /*ERRORCODES*/
          11. #defineSCI_NO_ERR0/*Functioncallwassuccessful*/
          12. #defineSCI_BAD_CH1/*Invalidcommunicationsportchannel*/
          13. #defineSCI_RX_EMPTY2/*Rxbufferisempty,nocharacteravailable*/
          14. #defineSCI_TX_FULL3/*Txbufferisfull,couldnotdepositcharacter*/
          15. #defineSCI_TX_EMPTY4/*IftheTxbufferisempty.*/
          16. #defineSCI_RX_TIMEOUT5/*Ifatimeoutoccurredwhilewaitingforacharacter*/
          17. #defineSCI_TX_TIMEOUT6/*Ifatimeoutoccurredwhilewaitingtosendachar.*/
          18. #defineSCI_PARITY_NONE0/*Definesforsettingparity*/
          19. #defineSCI_PARITY_ODD1
          20. #defineSCI_PARITY_EVEN2
          21. /*
          22. *********************************************************************************************************
          23. *DATATYPES
          24. *********************************************************************************************************
          25. */
          26. typedefstruct{
          27. shortRingBufRxCtr;/*NumberofcharactersintheRxringbuffer*/
          28. OS_EVENT*RingBufRxSem;/*PointertoRxsemaphore*/
          29. unsignedchar*RingBufRxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
          30. unsignedchar*RingBufRxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
          31. unsignedcharRingBufRx[SCI_RX_BUF_SIZE];/*Ringbuffercharacterstorage(Rx)*/
          32. shortRingBufTxCtr;/*NumberofcharactersintheTxringbuffer*/
          33. OS_EVENT*RingBufTxSem;/*PointertoTxsemaphore*/
          34. unsignedchar*RingBufTxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
          35. unsignedchar*RingBufTxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
          36. unsignedcharRingBufTx[SCI_TX_BUF_SIZE];/*Ringbuffercharacterstorage(Tx)*/
          37. }SCI_RING_BUF;
          38. /**
          39. *Toobtainacharacterfromthecommunicationschannel.
          40. *@paramport,portcanbeSCI0/SCI1
          41. *@paramto,istheamountoftime(inclockticks)thatthecallingfunctioniswillingto
          42. *waitforacharactertoarrive.Ifyouspecifyatimeoutof0,thefunctionwill
          43. *waitforeverforacharactertoarrive.
          44. *@paramerr,isapointertowhereanerrorcodewillbeplaced:
          45. **errissettoSCI_NO_ERRifacharacterhasbeenreceived
          46. **errissettoSCI_RX_TIMEOUTifatimeoutoccurred
          47. **errissettoSCI_BAD_CHifyouspecifyaninvalidchannelnumber
          48. *@returnThecharacterinthebuffer(orNULifatimeoutoccurred)
          49. */
          50. unsignedcharSCIGetCharB(unsignedcharch,unsignedshortto,unsignedchar*err);
            /**
          51. *Thisfunctioniscalledbyyourapplicationtosendacharacteronthecommunications
          52. *channel.Thefunctionwillwaitforthebuffertoemptyoutifthebufferisfull.
          53. *Thefunctionreturnstoyourapplicationifthebufferdoesntemptywithinthespecified
          54. *timeout.Atimeoutvalueof0meansthatthecallingfunctionwillwaitforeverforthe
          55. *buffertoemptyout.ThecharactertosendisfirstinsertedintotheTxbufferandwill
          56. *besentbytheTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISR
          57. *willbeenabled.
          58. *
          59. *@paramport,portcanbeSCI0/SCI1
          60. *@paramcisthecharactertosend.
          61. *@paramtoisthetimeout(inclockticks)towaitincasethebufferisfull.Ifyou
          62. *specifyatimeoutof0,thefunctionwillwaitforeverforthebuffertoempty.
          63. *@returnSCI_NO_ERRifthecharacterwasplacedintheTxbuffer
          64. *SCI_TX_TIMEOUTifthebufferdidntemptywithinthespecifiedtimeoutperiod
          65. *SCI_BAD_CHifyouspecifyaninvalidchannelnumber
          66. */
          67. unsignedcharSCIPutCharB(unsignedcharport,unsignedcharc,unsignedshortto);
            /**
          68. *Toinitializethecommunicationsmodule.
          69. *Youmustcallthisfunctionbeforecallinganyotherfunctions.
          70. */
          71. voidSCIBufferInit(void);
            /**
          72. *Toseeifanycharacterisavailablefromthecommunicationschannel.
          73. *
          74. *@paramport,portcanbeSCI0/SCI1
          75. *@returnIfatleastonecharacterisavailable,thefunctionreturns
          76. *FALSE(0)otherwise,thefunctionreturnsTRUE(1).
          77. */
          78. unsignedcharSCIBufferIsEmpty(unsignedcharport);
          79. /**
          80. *ToseeifanymorecharacterscanbeplacedintheTxbuffer.
          81. *Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
          82. *
          83. *@paramport,portcanbeSCI0/SCI1
          84. *@returnIfthebufferisfull,thefunctionreturnsTRUE
          85. *otherwise,thefunctionreturnsFALSE.
          86. */
          87. unsignedcharSCIBufferIsFull(unsignedcharport);
            #endif

          1. /**
          2. *SCI(SerialCommunicationInterface)BufferedSerialI/O
          3. *@filesci_ucos.c
          4. *@authorLiYuan
          5. *@platformmc9s12XX
          6. *@date2012-7-22
          7. *@version1.0.1
          8. */
          9. #include"derivative.h"/*derivative-specificdefinitions*/
          10. #include
          11. #include"includes.H"
          12. #include"sci.h"
          13. #include"sci_rtos.h"
            /**
          14. *GLOBALVARIABLES
          15. */
          16. SCI_RING_BUFSCI0Buf;
          17. SCI_RING_BUFSCI1Buf;
          18. /**
          19. *Toobtainacharacterfromthecommunicationschannel.
          20. *@paramport,portcanbeSCI0/SCI1
          21. *@paramto,istheamountoftime(inclockticks)thatthecallingfunctioniswillingto
          22. *waitforacharactertoarrive.Ifyouspecifyatimeoutof0,thefunctionwill
          23. *waitforeverforacharactertoarrive.
          24. *@paramerr,isapointertowhereanerrorcodewillbeplaced:
          25. **errissettoSCI_NO_ERRifacharacterhasbeenreceived
          26. **errissettoSCI_RX_TIMEOUTifatimeoutoccurred
          27. **errissettoSCI_BAD_CHifyouspecifyaninvalidchannelnumber
          28. *@returnThecharacterinthebuffer(orNULifatimeoutoccurred)
          29. */
          30. unsignedcharSCIGetCharB(unsignedcharport,unsignedshortto,INT8U*err)
          31. {
          32. #ifOS_CRITICAL_METHOD==3u/*AllocatestorageforCPUstatusregister*/
          33. OS_CPU_SRcpu_sr=0u;
          34. #endif
          35. unsignedcharc;
          36. unsignedcharoserr;
          37. SCI_RING_BUF*pbuf;
            switch(port)
          38. {/*Obtainpointertocommunicationschannel*/
          39. caseSCI0:
          40. pbuf=&SCI0Buf;
          41. break;
            caseSCI1:
          42. pbuf=&SCI1Buf;
          43. break;
            default:
          44. *err=SCI_BAD_CH;
          45. return(0);
          46. }
          47. OSSemPend(pbuf->RingBufRxSem,to,&oserr);/*Waitforcharactertoarrive*/
          49. if(oserr==OS_TIMEOUT)
          50. {/*Seeifcharactersreceivedwithintimeout*/
          51. *err=SCI_RX_TIMEOUT;/*No,returnerrorcode*/
          52. return(NUL);
          53. }
          54. else
          55. {
          56. OS_ENTER_CRITICAL();
          57. pbuf->RingBufRxCtr--;/*Yes,decrementcharactercount*/
          58. c=*pbuf->RingBufRxOutPtr++;/*Getcharacterfrombuffer*/
          59. if(pbuf->RingBufRxOutPtr==&pbuf->RingBufRx[SCI_RX_BUF_SIZE]){/*WrapOUTpointer*/
          60. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
          61. }
          62. OS_EXIT_CRITICAL();
          63. *err=SCI_NO_ERR;
          64. return(c);
          65. }
          66. }
            /**
          67. *Thisfunctioniscalledbyyourapplicationtosendacharacteronthecommunications
          68. *channel.Thefunctionwillwaitforthebuffertoemptyoutifthebufferisfull.
          69. *Thefunctionreturnstoyourapplicationifthebufferdoesntemptywithinthespecified
          70. *timeout.Atimeoutvalueof0meansthatthecallingfunctionwillwaitforeverforthe
          71. *buffertoemptyout.ThecharactertosendisfirstinsertedintotheTxbufferandwill
          72. *besentbytheTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISR
          73. *willbeenabled.
          74. *
          75. *@paramport,portcanbeSCI0/SCI1
          76. *@paramcisthecharactertosend.
          77. *@paramtoisthetimeout(inclockticks)towaitincasethebufferisfull.Ifyou
          78. *specifyatimeoutof0,thefunctionwillwaitforeverforthebuffertoempty.
          79. *@returnSCI_NO_ERRifthecharacterwasplacedintheTxbuffer
          80. *SCI_TX_TIMEOUTifthebufferdidntemptywithinthespecifiedtimeoutperiod
          81. *SCI_BAD_CHifyouspecifyaninvalidchannelnumber
          82. */
          83. unsignedcharSCIPutCharB(unsignedcharport,unsignedcharc,unsignedshortto)
          84. {
          85. #ifOS_CRITICAL_METHOD==3u/*AllocatestorageforCPUstatusregister*/
          86. OS_CPU_SRcpu_sr=0u;
          87. #endif
            SCI_RING_BUF*pbuf;
          88. unsignedcharoserr;
          89. switch(port)
          90. {/*Obtainpointertocommunicationschannel*/
          91. caseSCI0:
          92. pbuf=&SCI0Buf;
          93. break;
            caseSCI1:
          94. pbuf=&SCI1Buf;
          95. break;
            default:
          96. return(SCI_BAD_CH);
          97. }
            OSSemPend(pbuf->RingBufTxSem,to,&oserr);/*WaitforspaceinTxbuffer*/
          98. if(oserr==OS_TIMEOUT)
          99. {
          100. return(SCI_TX_TIMEOUT);/*Timedout,returnerrorcode*/
          101. }
          102. OS_ENTER_CRITICAL();
          103. pbuf->RingBufTxCtr++;/*No,incrementcharactercount*/
          104. *pbuf->RingBufTxInPtr++=c;/*Putcharacterintobuffer*/
          105. if(pbuf->RingBufTxInPtr==&pbuf->RingBufTx[SCI_TX_BUF_SIZE])
          106. {
          107. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];/*WrapINpointer*/
          108. }
          109. if(pbuf->RingBufTxCtr==1)/*Seeifthisisthefirstcharacter*/
          110. {
          111. SCIEnableTxInt(port);/*Yes,EnableTxinterrupts*/
          112. }
          113. OS_EXIT_CRITICAL();
          114. return(SCI_NO_ERR);
          115. }
            /**
          116. *Toinitializethecommunicationsmodule.
          117. *Youmustcallthisfunctionbeforecallinganyotherfunctions.
          118. */
          119. voidSCIBufferInit(void)
          120. {
          121. SCI_RING_BUF*pbuf;
            pbuf=&SCI0Buf;/*InitializetheringbufferforSCI0*/
          122. pbuf->RingBufRxCtr=0;
          123. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          124. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
          125. pbuf->RingBufRxSem=OSSemCreate(0);
          126. pbuf->RingBufTxCtr=0;
          127. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
          128. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
          129. pbuf->RingBufTxSem=OSSemCreate(SCI_TX_BUF_SIZE);
            pbuf=&SCI1Buf;/*InitializetheringbufferforSCI1*/
          130. pbuf->RingBufRxCtr=0;
          131. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          132. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
          133. pbuf->RingBufRxSem=OSSemCreate(0);
          134. pbuf->RingBufTxCtr=0;
          135. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
          136. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
          137. pbuf->RingBufTxSem=OSSemCreate(SCI_TX_BUF_SIZE);
          138. }
            /**
          139. *Toseeifanycharacterisavailablefromthecommunicationschannel.
          140. *
          141. *@paramport,portcanbeSCI0/SCI1
          142. *@returnIfatleastonecharacterisavailable,thefunctionreturns
          143. *FALSE(0)otherwise,thefunctionreturnsTRUE(1).
          144. */
          145. unsignedcharSCIBufferIsEmpty(unsignedcharport)
          146. {
            #ifOS_CRITICAL_METHOD==3u/*AllocatestorageforCPUstatusregister*/
          147. OS_CPU_SRcpu_sr=0u;
          148. #endif
          149. unsignedcharempty;
          150. SCI_RING_BUF*pbuf;
          151. switch(port)
          152. {/*Obtainpointertocommunicationschannel*/
          153. caseSCI0:
          154. pbuf=&SCI0Buf;
          155. break;
            caseSCI1:
          156. pbuf=&SCI1Buf;
          157. break;
          158. default:
          159. return(0xff);
          160. break;
          161. }
          162. OS_ENTER_CRITICAL();
          163. if(pbuf->RingBufRxCtr>0)
          164. {/*Seeifbufferisempty*/
          165. empty=0;/*BufferisNOTempty*/
          166. }
          167. else
          168. {
          169. empty=1;/*Bufferisempty*/
          170. }
          171. OS_EXIT_CRITICAL();
          172. return(empty);
            }
            /**
          173. *ToseeifanymorecharacterscanbeplacedintheTxbuffer.
          174. *Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
          175. *
          176. *@paramport,portcanbeSCI0/SCI1
          177. *@returnIfthebufferisfull,thefunctionreturnsTRUE
          178. *otherwise,thefunctionreturnsFALSE.
          179. */
          180. unsignedcharSCIBufferIsFull(unsignedcharport)
          181. {
          182. #ifOS_CRITICAL_METHOD==3u/*AllocatestorageforCPUstatusregister*/
          183. OS_CPU_SRcpu_sr=0u;
          184. #endif
          185. charfull;
          186. SCI_RING_BUF*pbuf;
          187. switch(port)
          188. {/*Obtainpointertocommunicationschannel*/
          189. caseSCI0:
          190. pbuf=&SCI0Buf;
          191. break;
            caseSCI1:
          192. pbuf=&SCI1Buf;
          193. break;
            default:
          194. return(255);
          195. }
          196. OS_ENTER_CRITICAL();
          197. if(pbuf->RingBufTxCtr
          198. full=0;/*BufferisNOTfull*/
          199. }else{
          200. full=1;/*Bufferisfull*/
          201. }
          202. OS_EXIT_CRITICAL();
          203. return(full);
          204. }
          205. //ThisfunctioniscalledbytheRxISRtoinsertacharacterintothereceiveringbuffer.
          206. staticvoidSCIPutRxChar(unsignedcharport,unsignedcharc)
          207. {
            SCI_RING_BUF*pbuf;
            switch(port)
          208. {/*Obtainpointertocommunicationschannel*/
          209. caseSCI0:
          210. pbuf=&SCI0Buf;
          211. break;
            caseSCI1:
          212. pbuf=&SCI1Buf;
          213. break;
            default:
          214. return;
          215. }
          216. if(pbuf->RingBufRxCtr
          217. pbuf->RingBufRxCtr++;/*No,incrementcharactercount*/
          218. *pbuf->RingBufRxInPtr++=c;/*Putcharacterintobuffer*/
          219. if(pbuf->RingBufRxInPtr==&pbuf->RingBufRx[SCI_RX_BUF_SIZE]){/*WrapINpointer*/
          220. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          221. }
          222. (void)OSSemPost(pbuf->RingBufRxSem);/*Indicatethatcharacterwasreceived*/
          223. }
          224. }
          225. //ThisfunctioniscalledbytheTxISRtoextractthenextcharacterfromtheTxbuffer.
          226. //ThefunctionreturnsFALSEifthebufferisemptyafterthecharacterisextractedfrom
          227. //thebuffer.ThisisdonetosignaltheTxISRtodisableinterruptsbecausethisisthe
          228. //lastcharactertosend.
          229. staticunsignedcharSCIGetTxChar(unsignedcharport,unsignedchar*err)
          230. {
          231. unsignedcharc;
          232. SCI_RING_BUF*pbuf;
            switch(port)
          233. {/*Obtainpointertocommunicationschannel*/
          234. caseSCI0:
          235. pbuf=&SCI0Buf;
          236. break;
            caseSCI1:
          237. pbuf=&SCI1Buf;
          238. break;
            default:
          239. *err=SCI_BAD_CH;
          240. return(0);
          241. }
          242. if(pbuf->RingBufTxCtr>0){/*Seeifbufferisempty*/
          243. pbuf->RingBufTxCtr--;/*No,decrementcharactercount*/
          244. c=*pbuf->RingBufTxOutPtr++;/*Getcharacterfrombuffer*/
          245. if(pbuf->RingBufTxOutPtr==&pbuf->RingBufTx[SCI_TX_BUF_SIZE]){/*WrapOUTpointer*/
          246. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
          247. }
          248. (void)OSSemPost(pbuf->RingBufTxSem);/*Indicatethatcharacterwillbesent*/
          249. *err=SCI_NO_ERR;
          250. return(c);/*Charactersarestillavailable*/
          251. }else{
          252. *err=SCI_TX_EMPTY;
          253. return(NUL);/*Bufferisempty*/
          254. }
          255. }
          256. voidSCI0_ISR_Handler(void)
          257. {
          258. charstatus;
          259. chardata;
          260. unsignedcharerr;
          262. status=SCI0SR1;
            if(status&0x0F)//0x1F=00011111,ifstatusisnotReceiveDataRegFullFlag
          263. {
          264. //Seeifwehavesomekindoferror
          265. //Clearinterrupt(donothingaboutit!)
          266. data=SCI0DRL;
          267. }
          268. elseif(status&0x20)//ReceiveDataRegFullFlag
          269. {
          270. data=SCI0DRL;
          271. SCIPutRxChar(SCI0,data);//Insertreceivedcharacterintobuffer
          272. }
          273. elseif(status&0x80)
          274. {
          275. data=SCIGetTxChar(SCI0,&err);//Getnextcharactertosend.
          276. if(err==SCI_TX_EMPTY)
          277. {//Dowehaveanymorecharacterstosend?
          278. //No,DisableTxinterrupts
          279. SCIDisTxInt(SCI0);
          280. }
          281. else
          282. {
          283. SCI0DRL=data;//Yes,Sendcharacter
          284. }
          285. }
          286. }
          287. voidSCI1_ISR_Handler(void)
          288. {
          289. charstatus;
          290. chardata;
          291. unsignedcharerr;
          293. status=SCI1SR1;
            if(status&0x0F)//0x1F=00011111,ifstatusisnotReceiveDataRegFullFlag
          294. {
          295. //Seeifwehavesomekindoferror
          296. //Clearinterrupt(donothingaboutit!)
          297. data=SCI1DRL;
          298. }
          299. elseif(status&0x20)//ReceiveDataRegFullFlag
          300. {
          301. data=SCI1DRL;
          302. SCIPutRxChar(SCI1,data);//Insertreceivedcharacterintobuffer
          303. }
          304. elseif(status&0x80)
          305. {
          306. data=SCIGetTxChar(SCI1,&err);//Getnextcharactertosend.
          307. if(err==SCI_TX_EMPTY)
          308. {//Dowehaveanymorecharacterstosend?
          309. //No,DisableTxinterrupts
          310. SCIDisTxInt(SCI1);
          311. }
          312. else
          313. {
          314. SCI1DRL=data;//Yes,Sendcharacter
          315. }
          316. }
          317. }
            #pragmaCODE_SEGNON_BANKED
          318. interruptVectorNumber_Vsci0voidSCI0_ISR(void)
          319. {
            #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)
          320. __asmldaaPPAGE;//3~,GetcurrentvalueofPPAGEregister
          321. __asmpsha;//2~,PushPPAGEregisterontocurrenttasksstack
          322. #endif
          324. __asmincOSIntNesting;//OSIntNesting++;
            //if(OSIntNesting==1)
          325. //{
          326. //OSTCBCur->OSTCBStkPtr=StackPointer;
          327. //}
          328. __asm
          329. {
          330. ldabOSIntNesting
          331. cmpb#$01
          332. bneSCI0ISR1
            ldxOSTCBCur
          333. sts0,x
          334. SCI0ISR1:
          335. }
            #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)
          336. __asmcallSCI0_ISR_Handler;
          337. __asmcallOSIntExit;
          338. #else
          339. __asmjsrSCI0_ISR_Handler;
          340. __asmjsrOSIntExit;
          341. #endif
            #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)
          342. __asmpula;//3~,GetvalueofPPAGEregister
          343. __asmstaaPPAGE;//3~,StoreintoCPUsPPAGEregister
          344. #endif
            }
            interruptVectorNumber_Vsci1voidSCI1_ISR(void)
          345. {
            #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)
          346. __asmldaaPPAGE;//3~,GetcurrentvalueofPPAGEregister
          347. __asmpsha;//2~,PushPPAGEregisterontocurrenttasksstack
          348. #endif
          350. __asmincOSIntNesting;//OSIntNesting++;
            //if(OSIntNesting==1)
          351. //{
          352. //OSTCBCur->OSTCBStkPtr=StackPointer;
          353. //}
          354. __asm
          355. {
          356. ldabOSIntNesting
          357. cmpb#$01
          358. bneSCI1ISR1
            ldxOSTCBCur
          359. sts0,x
          360. SCI1ISR1:
          361. }
            #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)
          362. __asmcallSCI1_ISR_Handler;
          363. __asmcallOSIntExit;
          364. #else
          365. __asmjsrSCI1_ISR_Handler;
          366. __asmjsrOSIntExit;
          367. #endif
            #ifdefined(__BANKED__)||defined(__LARGE__)||defined(__PPAGE__)
          368. __asmpula;//3~,GetvalueofPPAGEregister
          369. __asmstaaPPAGE;//3~,StoreintoCPUsPPAGEregister
          370. #endif
            }
          下面給個簡單的例子：
          1. #include/*commondefinesandmacros*/
          2. #include"derivative.h"/*derivative-specificdefinitions*/
            #include"INCLUDES.H"
          3. #include"crg.h"
          4. #include"sci.h"
          5. #include"sci_rtos.h"
            OS_STKAppStartTaskStk[64];
            staticvoidAppStartTask(void*pdata);
            voidmain(void)
          6. {
          7. /*putyourowncodehere*/
          8. OS_CPU_SRcpu_sr;
            CRGInit();
          9. CRGSetRTIFreqency(0x54);//200Hz
            EnableInterrupts;
          11. OS_ENTER_CRITICAL();
          12. SCIInit(SCI0);
          13. SCIInit(SCI1);
          14. OS_EXIT_CRITICAL();
          16. OSInit();
          18. SCISetIEBit(SCI0,SCI_RIE);
          19. SCISetIEBit(SCI1,SCI_RIE);
          20. SCIBufferInit();
          22. (void)OSTaskCreate(AppStartTask,(void*)0x4321,(void*)&AppStartTaskStk[63],0);
          23. (void)OSStart();
          25. for(;;)
          26. {
          27. _FEED_COP();/*feedsthedog*/
          28. }/*loopforever*/
          30. /*pleasemakesurethatyouneverleavemain*/
          31. }
            staticvoidAppStartTask(void*pdata)
          32. {
          33. INT8Uerr;
          34. charC;
          35. (void)pdata;
          36. for(;;)
          37. {
          38. C=SCIGetCharB(SCI1,0,&err);
          39. if(err==SCI_NO_ERR)
          40. (void)SCIPutCharB(SCI1,C,0);
          41. }
          42. }

          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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