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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.antipu.com.cn/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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