在线看毛片网站电影-亚洲国产欧美日韩精品一区二区三区,国产欧美乱夫不卡无乱码,国产精品欧美久久久天天影视,精品一区二区三区视频在线观看,亚洲国产精品人成乱码天天看,日韩久久久一区,91精品国产91免费

<menu id="6qfwx"><li id="6qfwx"></li></menu>

    1. <menu id="6qfwx"><dl id="6qfwx"></dl></menu>
      

      <label id="6qfwx"><ol id="6qfwx"></ol></label><menu id="6qfwx"></menu><object id="6qfwx"><strike id="6qfwx"><noscript id="6qfwx"></noscript></strike></object>
      2. 

          3. <center id="6qfwx"><dl id="6qfwx"></dl></center>
            
	
	
            
		
			
		
            
    
    	
            
  		
            
		    
            
		      
		      
		      
		    
            
  		
            
  		
            
	
            


	


            
		
            
		            
            
        		
            
		
            







            


            
	
	
            
		
            新聞中心
            
	
            
	
            
	
            EEPW首頁 
	 > 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）2
            
    
            

            

            


	
	
	

            
	
            
		
            
			
            Freescale 9S12 系列單片機應(yīng)用筆記（SCI）2
            
						
            
				作者：
				時間：2016-11-20
				來源：網(wǎng)絡(luò)
				
				
				
				
				收藏
			
            

			
            
				
				
			
            

			
            
			
			
            
			
			
            
				
				
			
            
                
			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.biyoush.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。
            
				
            
                
			
							
            
                
			              
              
            
            
		
            
		
            
		
            
		
            
		
            
			
              
				
            • 
					
					
			  	
              • 
			  	
            • 
					
					
			  	
              • 
			  	
            • 
					
					
			  	
              • 
				
            • 
					
					
				
              • 
				
            • 
					
					
				
              • 
			
            
			
            
		
            
		
		
            
		
            
			
			
		
            
        
		
            
			
            關(guān)鍵詞：
            			            Freescale9S12系列單片
                        
            
            
            
			
            
		
            	
		

	

            
	
	
            
		
            
			
            評論
            					
		
            
		
            
			
            
			
				
            
					
					
            
						
                        
					
            
				
            
                		
						
						
			
            
		
            
		
            
		
            
            
			
            
		
            
	
            
	
            
	
            
		
		

            


	
            
	
            
		
		
	
            


    
            
        
            技術(shù)專區(qū)
            
      
            
      
            
			
      
             
       

            

   











            
	
            
	    關(guān)閉