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        STM32F10x 學(xué)習(xí)筆記6（USART實(shí)現(xiàn)串口通訊 2）
        
						
        
				作者：
				時(shí)間：2016-11-20
				來源：網(wǎng)絡(luò)
				
				
				
				
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			這次講講利用串口收發(fā)中斷來進(jìn)行串口通訊。STM32 上為每個(gè)串口分配了一個(gè)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(gè)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(hào)的。圖中也給出了如何控制每一個(gè)單獨(dú)的中斷源是否起作用。
        本文引用地址：http://www.104case.com/article/201611/318841.htm
        另外，Cortex-M3內(nèi)核中還有個(gè)NVIC，可以控制這里的中斷信號(hào)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(jí)別。關(guān)于NVIC可以參考《ARMCortexM3權(quán)威指南》，里面講解的非常詳細(xì)。
        簡(jiǎn)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(gè)，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(huì)使用發(fā)送數(shù)據(jù)寄存器空中斷，用這個(gè)中斷發(fā)送的效率會(huì)高一些。
        中斷處理函數(shù)的框架如下，如果檢測(cè)到錯(cuò)誤就清除錯(cuò)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(gè)。
        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(duì)收到的數(shù)據(jù)進(jìn)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(gè)利用環(huán)形緩沖區(qū)的串口驅(qū)動(dòng)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(gè)例子主程序，來演示如何使用上面的串口驅(qū)動(dòng)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. }

        
				
            
                
			
							
        
                
			              
              
            
        
		
        
		
        
		
        
		
        
		
        
			
          
				
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