3. 

        <meter id="pryje"><nav id="pryje"><delect id="pryje"></delect></nav></meter>
          <label id="pryje"></label>
          
	
	
          
		
			
		
          
    
    	
          
  		
          
		    
          
		      
		      
		      
		    
          
  		
          
  		
          
	
          


	


          
		
          
		            
            
        		
          
		
          







          


          
	
	
          
		
          新聞中心
          
	
          
	
          
	
          EEPW首頁 
	 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > STM32F10x 學(xué)習(xí)筆記6（USART實現(xiàn)串口通訊 2）
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          STM32F10x 學(xué)習(xí)筆記6（USART實現(xiàn)串口通訊 2）
          
						
          
				作者：
				時間：2016-11-20
				來源：網(wǎng)絡(luò)
				
				
				
				
				收藏
			
          

			
          
				
				
			
          

			
          
			
			
          
			
			
          
				
				
			
          
                
			這次講講利用串口收發(fā)中斷來進行串口通訊。STM32 上為每個串口分配了一個中斷。也就是說無論是發(fā)送完成還是收到數(shù)據(jù)或是數(shù)據(jù)溢出都產(chǎn)生同一個中斷。程序需在中斷處理函數(shù)中讀取狀態(tài)寄存器(USART_SR)來判斷當(dāng)前的是什么中斷。下面的中斷映像圖給出了這些中斷源是如何匯合成最終的中斷信號的。圖中也給出了如何控制每一個單獨的中斷源是否起作用。
          本文引用地址：http://www.ex-cimer.com/article/201611/318841.htm
          另外，Cortex-M3內(nèi)核中還有個NVIC，可以控制這里的中斷信號是否觸發(fā)中斷處理函數(shù)的執(zhí)行，還有這些外部中斷的級別。關(guān)于NVIC可以參考《ARMCortexM3權(quán)威指南》，里面講解的非常詳細。
          簡單的說，為了開啟中斷，我們需要如下的代碼：
          1. NVIC_InitTypeDefNVIC_InitStructure;
          2. NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;
          3. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
          4. NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
          5. NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
          6. NVIC_Init(&NVIC_InitStructure);
          8. USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);//開啟接收中斷
          9. USART_ITConfig(USART1,USART_IT_TXE,ENABLE);//開啟發(fā)送中斷
          這里多說一句，串口的發(fā)送中斷有兩個，分別是：
          1. l發(fā)送數(shù)據(jù)寄存器空中斷（TXE）
          2. l發(fā)送完成中斷（TC）
          一般來說我們會使用發(fā)送數(shù)據(jù)寄存器空中斷，用這個中斷發(fā)送的效率會高一些。
          中斷處理函數(shù)的框架如下，如果檢測到錯誤就清除錯誤，收到數(shù)了就處理。發(fā)完當(dāng)前數(shù)據(jù)了就發(fā)下一個。
          1. voidUSART1_IRQHandler(void)
          2. {
          3. unsignedintdata;
          5. if(USART1->SR&0x0F)
          6. {
          7. //Seeifwehavesomekindoferror,Clearinterrupt
          8. data=USART1->DR;
          9. }
          10. elseif(USART1->SR&USART_FLAG_RXNE)//ReceiveDataRegFullFlag
          11. {
          12. data=USART1->DR;
          13. //對收到的數(shù)據(jù)進行處理，或者干些其他的事
          14. }
          15. elseif(USART1->SR&USART_FLAG_TXE)
          16. {
          17. {//可以發(fā)送數(shù)據(jù)了，如果沒有數(shù)據(jù)需要發(fā)送，就在這里關(guān)閉發(fā)送中斷
          18. USART1->DR=something;//Yes,Sendcharacter
          19. }
          20. }
          21. }

          下面給一個利用環(huán)形緩沖區(qū)的串口驅(qū)動程序。
          1. #ifndef_COM_BUFFERED_H_
          2. #define_COM_BUFFERED_H_
          4. #defineCOM10
          5. #defineCOM21
          7. #defineCOM_RX_BUF_SIZE64/*NumberofcharactersinRxringbuffer*/
          8. #defineCOM_TX_BUF_SIZE64/*NumberofcharactersinTxringbuffer*/
          10. #defineCOM_NO_ERR0/*Functioncallwassuccessful*/
          11. #defineCOM_BAD_CH1/*Invalidcommunicationsportchannel*/
          12. #defineCOM_RX_EMPTY2/*Rxbufferisempty,nocharacteravailable*/
          13. #defineCOM_TX_FULL3/*Txbufferisfull,couldnotdepositcharacter*/
          14. #defineCOM_TX_EMPTY4/*IftheTxbufferisempty.*/
          17. /************************************************************
          18. *function:COMGetCharB
          19. *parameter:charport,portcanbeCOM1/COM2
          20. *parameter:char*errisapointertowhereanerrorcodewillbeplaced:
          21. **errissettoCOM_NO_ERRifacharacterisavailable
          22. **errissettoCOM_RX_EMPTYiftheRxbufferisempty
          23. **errissettoCOM_BAD_CHifyouhavespecifiedaninvalidchannel
          24. *return:char
          25. *usage:Thisfunctioniscalledbyyourapplicationtoobtainacharacterfromthecommunications
          26. *channel.
          27. *changelog:
          28. *************************************************************/
          29. unsignedcharCOMGetCharB(unsignedcharch,unsignedchar*err);
          31. /************************************************************
          32. *function:COMPutCharB
          33. *parameter:charport,portcanbeCOM1/COM2
          34. *return:COMM_NO_ERRifthefunctionwassuccessful(thebufferwasnotfull)
          35. *COMM_TX_FULLifthebufferwasfull
          36. *COMM_BAD_CHifyouhavespecifiedanincorrectchannel
          38. *usage:Thisfunctioniscalledbyyourapplicationtosendacharacteronthecommunications
          39. *channel.ThecharactertosendisfirstinsertedintotheTxbufferandwillbesentby
          40. *theTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISRwillbe
          41. *enabled.IftheTxbufferisfull,thecharacterwillnotbesent(i.e.itwillbelost)
          42. *changelog:
          43. *************************************************************/
          44. unsignedcharCOMPutCharB(unsignedcharport,unsignedcharc);
          46. /************************************************************
          47. *function:COMBufferInit
          48. *parameter:
          49. *return:
          50. *usage:Thisfunctioniscalledbyyourapplicationtoinitializethecommunicationsmodule.You
          51. *mustcallthisfunctionbeforecallinganyotherfunctions.
          52. *changelog:
          53. *************************************************************/
          54. voidCOMBufferInit(void);
          56. /************************************************************
          57. *function:COMBufferIsEmpty
          58. *parameter:charport,portcanbeCOM1/COM2
          59. *return:char
          60. *usage:Thisfunctioniscalledbyyourapplicationtosee
          61. *ifanycharacterisavailablefromthecommunicationschannel.
          62. *Ifatleastonecharacterisavailable,thefunctionreturns
          63. *FALSE(0)otherwise,thefunctionreturnsTRUE(1).
          64. *changelog:
          65. *************************************************************/
          66. unsignedcharCOMBufferIsEmpty(unsignedcharport);
          68. /************************************************************
          69. *function:COMBufferIsFull
          70. *parameter:charport,portcanbeCOM1/COM2
          71. *return:char
          72. *usage:Thisfunctioniscalledbyyourapplicationtoseeifanymorecharacterscanbeplaced
          73. *intheTxbuffer.Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
          74. *Ifthebufferisfull,thefunctionreturnsTRUEotherwise,thefunctionreturnsFALSE.
          75. *changelog:
          76. *************************************************************/
          77. unsignedcharCOMBufferIsFull(unsignedcharport);
          79. #endif

          1. /*
          2. *file:com_buffered.c
          3. *author:LiYuan
          4. *platform:STM32F107
          5. *date:2013-5-5
          6. *version:0.0.1
          7. *description:UARTRingBuffer
          8. **/
          10. #include"stm32f10x_usart.h"
          11. #include"com_buffered.h"
          13. #defineOS_ENTER_CRITICAL()__set_PRIMASK(1)
          14. #defineOS_EXIT_CRITICAL()__set_PRIMASK(0)
          16. /**
          17. *EnablesTransmiterinterrupt.
          18. **/
          19. staticvoidCOMEnableTxInt(unsignedcharport)
          20. {
          21. staticUSART_TypeDef*map[2]={USART1,USART2};
          22. USART_ITConfig(map[port],USART_IT_TXE,ENABLE);
          23. }
          24. /*
          25. *********************************************************************************************************
          26. *DATATYPES
          27. *********************************************************************************************************
          28. */
          29. typedefstruct{
          30. shortRingBufRxCtr;/*NumberofcharactersintheRxringbuffer*/
          31. unsignedchar*RingBufRxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
          32. unsignedchar*RingBufRxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
          33. unsignedcharRingBufRx[COM_RX_BUF_SIZE];/*Ringbuffercharacterstorage(Rx)*/
          34. shortRingBufTxCtr;/*NumberofcharactersintheTxringbuffer*/
          35. unsignedchar*RingBufTxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
          36. unsignedchar*RingBufTxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
          37. unsignedcharRingBufTx[COM_TX_BUF_SIZE];/*Ringbuffercharacterstorage(Tx)*/
          38. }COM_RING_BUF;
          40. /*
          41. *********************************************************************************************************
          42. *GLOBALVARIABLES
          43. *********************************************************************************************************
          44. */
          46. COM_RING_BUFCOM1Buf;
          47. COM_RING_BUFCOM2Buf;
          50. /************************************************************
          51. *function:COMGetCharB
          52. *parameter:charport,portcanbeCOM1/COM2
          53. *parameter:char*errisapointertowhereanerrorcodewillbeplaced:
          54. **errissettoCOM_NO_ERRifacharacterisavailable
          55. **errissettoCOM_RX_EMPTYiftheRxbufferisempty
          56. **errissettoCOM_BAD_CHifyouhavespecifiedaninvalidchannel
          57. *return:char
          58. *usage:Thisfunctioniscalledbyyourapplicationtoobtainacharacterfromthecommunications
          59. *channel.
          60. *changelog:
          61. *************************************************************/
          62. unsignedcharCOMGetCharB(unsignedcharport,unsignedchar*err)
          63. {
          64. //unsignedcharcpu_sr;
          66. unsignedcharc;
          67. COM_RING_BUF*pbuf;
          69. switch(port)
          70. {/*Obtainpointertocommunicationschannel*/
          71. caseCOM1:
          72. pbuf=&COM1Buf;
          73. break;
          75. caseCOM2:
          76. pbuf=&COM2Buf;
          77. break;
          79. default:
          80. *err=COM_BAD_CH;
          81. return(0);
          82. }
          83. OS_ENTER_CRITICAL();
          84. if(pbuf->RingBufRxCtr>0)/*Seeifbufferisempty*/
          85. {
          86. pbuf->RingBufRxCtr--;/*No,decrementcharactercount*/
          87. c=*pbuf->RingBufRxOutPtr++;/*Getcharacterfrombuffer*/
          88. if(pbuf->RingBufRxOutPtr==&pbuf->RingBufRx[COM_RX_BUF_SIZE])
          89. {
          90. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];/*WrapOUTpointer*/
          91. }
          92. OS_EXIT_CRITICAL();
          93. *err=COM_NO_ERR;
          94. return(c);
          95. }else{
          96. OS_EXIT_CRITICAL();
          97. *err=COM_RX_EMPTY;
          98. c=0;/*Bufferisempty,return0*/
          99. return(c);
          100. }
          101. }
          104. /************************************************************
          105. *function:COMPutCharB
          106. *parameter:charport,portcanbeCOM1/COM2
          107. *return:COMM_NO_ERRifthefunctionwassuccessful(thebufferwasnotfull)
          108. *COMM_TX_FULLifthebufferwasfull
          109. *COMM_BAD_CHifyouhavespecifiedanincorrectchannel
          111. *usage:Thisfunctioniscalledbyyourapplicationtosendacharacteronthecommunications
          112. *channel.ThecharactertosendisfirstinsertedintotheTxbufferandwillbesentby
          113. *theTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISRwillbe
          114. *enabled.IftheTxbufferisfull,thecharacterwillnotbesent(i.e.itwillbelost)
          115. *changelog:
          116. *1.firstimplimentedbyliyuan2010.11.5
          117. *************************************************************/
          118. unsignedcharCOMPutCharB(unsignedcharport,unsignedcharc)
          119. {
          120. //unsignedcharcpu_sr;
          122. COM_RING_BUF*pbuf;
          123. switch(port)
          124. {/*Obtainpointertocommunicationschannel*/
          125. caseCOM1:
          126. pbuf=&COM1Buf;
          127. break;
          129. caseCOM2:
          130. pbuf=&COM2Buf;
          131. break;
          133. default:
          134. return(COM_BAD_CH);
          135. }
          137. OS_ENTER_CRITICAL();
          138. if(pbuf->RingBufTxCtr
          139. pbuf->RingBufTxCtr++;/*No,incrementcharactercount*/
          140. *pbuf->RingBufTxInPtr++=c;/*Putcharacterintobuffer*/
          141. if(pbuf->RingBufTxInPtr==&pbuf->RingBufTx[COM_TX_BUF_SIZE]){/*WrapINpointer*/
          142. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
          143. }
          144. if(pbuf->RingBufTxCtr==1){/*Seeifthisisthefirstcharacter*/
          145. COMEnableTxInt(port);/*Yes,EnableTxinterrupts*/
          146. OS_EXIT_CRITICAL();
          147. }else{
          148. OS_EXIT_CRITICAL();
          149. }
          150. return(COM_NO_ERR);
          151. }else{
          152. OS_EXIT_CRITICAL();
          153. return(COM_TX_FULL);
          154. }
          155. }
          157. /************************************************************
          158. *function:COMBufferInit
          159. *parameter:
          160. *return:
          161. *usage:Thisfunctioniscalledbyyourapplicationtoinitializethecommunicationsmodule.You
          162. *mustcallthisfunctionbeforecallinganyotherfunctions.
          163. *changelog:
          164. *************************************************************/
          165. voidCOMBufferInit(void)
          166. {
          167. COM_RING_BUF*pbuf;
          169. pbuf=&COM1Buf;/*InitializetheringbufferforCOM0*/
          170. pbuf->RingBufRxCtr=0;
          171. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          172. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
          173. pbuf->RingBufTxCtr=0;
          174. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
          175. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
          177. pbuf=&COM2Buf;/*InitializetheringbufferforCOM1*/
          178. pbuf->RingBufRxCtr=0;
          179. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          180. pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];
          181. pbuf->RingBufTxCtr=0;
          182. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
          183. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];
          184. }
          186. /************************************************************
          187. *function:COMBufferIsEmpty
          188. *parameter:charport,portcanbeCOM1/COM2
          189. *return:char
          190. *usage:Thisfunctioniscalledbyyourapplicationtosee
          191. *ifanycharacterisavailablefromthecommunicationschannel.
          192. *Ifatleastonecharacterisavailable,thefunctionreturns
          193. *FALSE(0)otherwise,thefunctionreturnsTRUE(1).
          194. *changelog:
          195. *************************************************************/
          196. unsignedcharCOMBufferIsEmpty(unsignedcharport)
          197. {
          198. //unsignedcharcpu_sr;
          200. unsignedcharempty;
          201. COM_RING_BUF*pbuf;
          202. switch(port)
          203. {/*Obtainpointertocommunicationschannel*/
          204. caseCOM1:
          205. pbuf=&COM1Buf;
          206. break;
          208. caseCOM2:
          209. pbuf=&COM2Buf;
          210. break;
          212. default:
          213. return(1);
          214. }
          215. OS_ENTER_CRITICAL();
          216. if(pbuf->RingBufRxCtr>0)
          217. {/*Seeifbufferisempty*/
          218. empty=0;/*BufferisNOTempty*/
          219. }
          220. else
          221. {
          222. empty=1;/*Bufferisempty*/
          223. }
          224. OS_EXIT_CRITICAL();
          225. return(empty);
          226. }
          229. /************************************************************
          230. *function:COMBufferIsFull
          231. *parameter:charport,portcanbeCOM1/COM2
          232. *return:char
          233. *usage:Thisfunctioniscalledbyyourapplicationtoseeifanymorecharacterscanbeplaced
          234. *intheTxbuffer.Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
          235. *Ifthebufferisfull,thefunctionreturnsTRUEotherwise,thefunctionreturnsFALSE.
          236. *changelog:
          237. *************************************************************/
          238. unsignedcharCOMBufferIsFull(unsignedcharport)
          239. {
          240. //unsignedcharcpu_sr;
          242. charfull;
          243. COM_RING_BUF*pbuf;
          244. switch(port)
          245. {/*Obtainpointertocommunicationschannel*/
          246. caseCOM1:
          247. pbuf=&COM1Buf;
          248. break;
          250. caseCOM2:
          251. pbuf=&COM2Buf;
          252. break;
          254. default:
          255. return(1);
          256. }
          257. OS_ENTER_CRITICAL();
          258. if(pbuf->RingBufTxCtr
          259. full=0;/*BufferisNOTfull*/
          260. }else{
          261. full=1;/*Bufferisfull*/
          262. }
          263. OS_EXIT_CRITICAL();
          264. return(full);
          265. }
          268. //ThisfunctioniscalledbytheRxISRtoinsertacharacterintothereceiveringbuffer.
          269. staticvoidCOMPutRxChar(unsignedcharport,unsignedcharc)
          270. {
          271. COM_RING_BUF*pbuf;
          273. switch(port)
          274. {/*Obtainpointertocommunicationschannel*/
          275. caseCOM1:
          276. pbuf=&COM1Buf;
          277. break;
          279. caseCOM2:
          280. pbuf=&COM2Buf;
          281. break;
          283. default:
          284. return;
          285. }
          286. if(pbuf->RingBufRxCtr
          287. pbuf->RingBufRxCtr++;/*No,incrementcharactercount*/
          288. *pbuf->RingBufRxInPtr++=c;/*Putcharacterintobuffer*/
          289. if(pbuf->RingBufRxInPtr==&pbuf->RingBufRx[COM_RX_BUF_SIZE]){/*WrapINpointer*/
          290. pbuf->RingBufRxInPtr=&pbuf->RingBufRx[0];
          291. }
          292. }
          293. }
          296. //ThisfunctioniscalledbytheTxISRtoextractthenextcharacterfromtheTxbuffer.
          297. //ThefunctionreturnsFALSEifthebufferisemptyafterthecharacterisextractedfrom
          298. //thebuffer.ThisisdonetosignaltheTxISRtodisableinterruptsbecausethisisthe
          299. //lastcharactertosend.
          300. staticunsignedcharCOMGetTxChar(unsignedcharport,unsignedchar*err)
          301. {
          302. unsignedcharc;
          303. COM_RING_BUF*pbuf;
          305. switch(port)
          306. {/*Obtainpointertocommunicationschannel*/
          307. caseCOM1:
          308. pbuf=&COM1Buf;
          309. break;
          311. caseCOM2:
          312. pbuf=&COM2Buf;
          313. break;
          315. default:
          316. *err=COM_BAD_CH;
          317. return(0);
          318. }
          319. if(pbuf->RingBufTxCtr>0){/*Seeifbufferisempty*/
          320. pbuf->RingBufTxCtr--;/*No,decrementcharactercount*/
          321. c=*pbuf->RingBufTxOutPtr++;/*Getcharacterfrombuffer*/
          322. if(pbuf->RingBufTxOutPtr==&pbuf->RingBufTx[COM_TX_BUF_SIZE])
          323. {
          324. pbuf->RingBufTxOutPtr=&pbuf->RingBufTx[0];/*WrapOUTpointer*/
          325. }
          326. *err=COM_NO_ERR;
          327. return(c);/*Charactersarestillavailable*/
          328. }else{
          329. *err=COM_TX_EMPTY;
          330. return(0);/*Bufferisempty*/
          331. }
          332. }
          335. voidUSART1_IRQHandler(void)
          336. {
          337. unsignedintdata;
          338. unsignedcharerr;
          340. if(USART1->SR&0x0F)
          341. {
          342. //Seeifwehavesomekindoferror
          343. //Clearinterrupt(donothingaboutit!)
          344. data=USART1->DR;
          345. }
          346. elseif(USART1->SR&USART_FLAG_RXNE)//ReceiveDataRegFullFlag
          347. {
          348. data=USART1->DR;
          349. COMPutRxChar(COM1,data);//Insertreceivedcharacterintobuffer
          350. }
          351. elseif(USART1->SR&USART_FLAG_TXE)
          352. {
          353. data=COMGetTxChar(COM1,&err);//Getnextcharactertosend.
          354. if(err==COM_TX_EMPTY)
          355. {//Dowehaveanymorecharacterstosend?
          356. //No,DisableTxinterrupts
          357. //USART_ITConfig(USART1,USART_IT_TXE|USART_IT_TC,ENABLE);
          358. USART1->CR1&=~USART_FLAG_TXE|USART_FLAG_TC;
          359. }
          360. else
          361. {
          362. USART1->DR=data;//Yes,Sendcharacter
          363. }
          364. }
          365. }
          367. voidUSART2_IRQHandler(void)
          368. {
          369. unsignedintdata;
          370. unsignedcharerr;
          372. if(USART2->SR&0x0F)
          373. {
          374. //Seeifwehavesomekindoferror
          375. //Clearinterrupt(donothingaboutit!)
          376. data=USART2->DR;
          377. }
          378. elseif(USART2->SR&USART_FLAG_RXNE)//ReceiveDataRegFullFlag
          379. {
          380. data=USART2->DR;
          381. COMPutRxChar(COM2,data);//Insertreceivedcharacterintobuffer
          382. }
          383. elseif(USART2->SR&USART_FLAG_TXE)
          384. {
          385. data=COMGetTxChar(COM2,&err);//Getnextcharactertosend.
          386. if(err==COM_TX_EMPTY)
          387. {//Dowehaveanymorecharacterstosend?
          388. //No,DisableTxinterrupts
          389. //USART_ITConfig(USART2,USART_IT_TXE|USART_IT_TC,ENABLE);
          390. USART2->CR1&=~USART_FLAG_TXE|USART_FLAG_TC;
          391. }
          392. else
          393. {
          394. USART2->DR=data;//Yes,Sendcharacter
          395. }
          396. }
          397. }

          下面給個例子主程序，來演示如何使用上面的串口驅(qū)動代碼。
          1. #include"misc.h"
          2. #include"stm32f10x.h"
          3. #include"com_buffered.h"
          5. voidUART_PutStrB(unsignedcharport,uint8_t*str)
          6. {
          7. while(0!=*str)
          8. {
          9. COMPutCharB(port,*str);
          10. str++;
          11. }
          12. }
          14. voidUSART1_Init(void)
          15. {
          16. GPIO_InitTypeDefGPIO_InitStructure;
          17. USART_InitTypeDefUSART_InitStructure;
          18. NVIC_InitTypeDefNVIC_InitStructure;
          20. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
          22. /*ConfigureUSARTTxasalternatefunctionpush-pull*/
          23. GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
          24. GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
          25. GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
          26. GPIO_Init(GPIOA,&GPIO_InitStructure);
          28. /*ConfigureUSARTRxasinputfloating*/
          29. GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
          30. GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
          31. GPIO_Init(GPIOA,&GPIO_InitStructure);
          33. USART_InitStructure.USART_BaudRate=9600;
          34. USART_InitStructure.USART_WordLength=USART_WordLength_8b;
          35. USART_InitStructure.USART_StopBits=USART_StopBits_1;
          36. USART_InitStructure.USART_Parity=USART_Parity_No;
          37. USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
          38. USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
          39. USART_Init(USART1,&USART_InitStructure);
          41. USART_Cmd(USART1,ENABLE);
          43. NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;
          44. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
          45. NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
          46. NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
          47. NVIC_Init(&NVIC_InitStructure);
          48. }
          50. voidUSART2_Init(void)
          51. {
          52. GPIO_InitTypeDefGPIO_InitStructure;
          53. USART_InitTypeDefUSART_InitStructure;
          54. NVIC_InitTypeDefNVIC_InitStructure;
          56. RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO,ENABLE);
          58. /*ConfigureUSARTTxasalternatefunctionpush-pull*/
          59. GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
          60. GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5;
          61. GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
          62. GPIO_Init(GPIOD,&GPIO_InitStructure);
          64. /*ConfigureUSARTRxasinputfloating*/
          65. GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
          66. GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6;
          67. GPIO_Init(GPIOD,&GPIO_InitStructure);
          69. GPIO_PinRemapConfig(GPIO_Remap_USART2,ENABLE);
          70. RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
          72. USART_InitStructure.USART_BaudRate=9600;
          73. USART_InitStructure.USART_WordLength=USART_WordLength_8b;
          74. USART_InitStructure.USART_StopBits=USART_StopBits_1;
          75. USART_InitStructure.USART_Parity=USART_Parity_No;
          76. USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
          77. USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
          78. USART_Init(USART2,&USART_InitStructure);
          80. USART_Cmd(USART2,ENABLE);
          82. NVIC_InitStructure.NVIC_IRQChannel=USART2_IRQn;
          83. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
          84. NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
          85. NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
          86. NVIC_Init(&NVIC_InitStructure);
          87. }
          90. intmain(void)
          91. {
          92. unsignedcharc;
          93. unsignedcharerr;
          95. USART1_Init();
          96. USART2_Init();
          97. COMBufferInit();
          98. USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
          99. USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);
          101. UART_PutStrB(COM1,"HelloWorld!n");
          102. for(;;)
          103. {
          104. c=COMGetCharB(COM1,&err);
          105. if(err==COM_NO_ERR)
          106. {
          107. COMPutCharB(COM1,c);
          108. }
          109. }
          110. }

          
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
          • 
					
					
			  	
            • 
			  	
          • 
					
					
			  	
            • 
			  	
          • 
					
					
			  	
            • 
				
          • 
					
					
				
            • 
				
          • 
					
					
				
            • 
			
          
			
          
		
          
		
		
          
		
          
			
			
		
          
        
		
          
			
          關(guān)鍵詞：
            			            STM32F10xUSAR串口通
                        
            
          
            
			
          
		
          	
		

	

          
	
	
          
		
          
			
          評論
          					
		
          
		
          
			
          
			
				
          
					
					
          
						
                        
					
          
				
          
                		
						
						
			
          
		
          
		
          
		
          
            
			
            
		
          
	
          
	
          
	
          
		
		

          


	
          
	
          
		
		
	
          


    
          
        
          技術(shù)專區(qū)
          
      
          
      
          
			
      
           
       

          

   











          
	
          
	    關(guān)閉
	
          
	
	

          







	
	





          



          


看屁屁www成人影院,亚洲人妻成人图片,亚洲精品成人午夜在线,日韩在线 欧美成人

(function(){
    var bp = document.createElement('script');
    var curProtocol = window.location.protocol.split(':')[0];
    if (curProtocol === 'https') {
        bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
    }
    else {
        bp.src = 'http://push.zhanzhang.baidu.com/push.js';
    }
    var s = document.getElementsByTagName("script")[0];
    s.parentNode.insertBefore(bp, s);
})();