1、1 .紅外知識(shí)簡(jiǎn)介31.1. 怎么判斷遙控板是否發(fā)射了紅外命令（是否有電）31.2. 紅外遙控器是怎樣解決干擾問(wèn)題的32 .硬件簡(jiǎn)介32.1. 一體化紅外接收頭42.1.1. 一體化紅外接收頭在開(kāi)發(fā)板上的位置42.1.2. 一體化紅外接收頭原理圖52.1.3. 一體化紅外接收頭原理72.2. 迷你20鍵38K紅外遙控板72.2.1. 遙控器按鍵編碼表72.2.2. NEC編碼分析83 .源碼分析93.1. 主要思路93.2. 阻塞IO103.3. 中斷的上下半部103.4. 內(nèi)核定時(shí)器114 .運(yùn)行效果124.1. 打開(kāi)調(diào)試開(kāi)關(guān)的效果124.2. 不打開(kāi)調(diào)試開(kāi)關(guān)的效果175 .源碼清單185.

2、1. 驅(qū)動(dòng)程序185.1.1. ls1b_ir.h185.1.2. ls1b_ir.c185.1.3. Platform.c295.2. 應(yīng)用程序305.2.1.ls1b_ir_test_app.c306 .參考文檔3131版本更新日期更新內(nèi)容V1.02014.4.5創(chuàng)建1 .紅外知識(shí)簡(jiǎn)介個(gè)人認(rèn)為百度文庫(kù)中的文檔全面了解紅外遙控（中文版）.pdf講得很好。我這里只是把要點(diǎn)提一下。1.1. 怎么判斷遙控板是否發(fā)射了紅外命令（是否有電）我們時(shí)常會(huì)碰到一個(gè)問(wèn)題一一到底遙控器還有電沒(méi)有。對(duì)于電視遙控器可以取下電池看看，但是對(duì)于這里使用的迷你遙控器怎么辦？使用的是鋰電池。辦法是通過(guò)手機(jī)的攝像頭看遙控器的

3、紅外發(fā)射管。當(dāng)按下遙控器按鍵時(shí)，如果有電會(huì)發(fā)射紅外命令，遙控器上的紅外發(fā)射管會(huì)發(fā)出紅外光，手機(jī)的攝像頭能看到這種光。下圖全面了解紅外遙控（中文版）.pdf為通過(guò)手機(jī)攝像頭看遙控器的圖片1.2. 紅外遙控器是怎樣解決干擾問(wèn)題的只要有發(fā)熱的物體都有紅外光，問(wèn)題是這么多紅外光源，遙控器是怎樣進(jìn)行準(zhǔn)確的傳遞信息的呢？采取了兩種措施：一、采用指定波長(zhǎng)（940nm）的紅外光；二、對(duì)940nm的紅外光進(jìn)行調(diào)制，調(diào)制到38Khz上。雖然發(fā)出紅外光的光源有很多，但是每個(gè)發(fā)出紅外光的波長(zhǎng)不一定一樣，就算是都發(fā)出940nm的紅外光，通常也沒(méi)有什么規(guī)律，為了排除干擾能夠進(jìn)行準(zhǔn)確的通信，遙控器還將940nm的紅外光調(diào)制

4、到38Khz上。2 .硬件簡(jiǎn)介說(shuō)了這么久，還不知道開(kāi)發(fā)板和遙控器到底是哪一款，來(lái)個(gè)合影吧。注意：本驅(qū)動(dòng)是針對(duì)圖中所示的遙控器的驅(qū)動(dòng)。2.1. 一體化紅外接收頭2.1.1. 一體化紅外接收頭在開(kāi)發(fā)板上的位置先來(lái)看一下開(kāi)發(fā)板上一體化紅外接收頭在哪里位于電源和網(wǎng)口之間。2.1.2. 一體化紅外接收頭原理圖再來(lái)看看原理圖中的一體化紅外接收頭的電路IRM1GIRM川4GPIO60«5VO,G341s.iu10X0402-11|卜I3qIR-IRM-3638T-RH由圖可知，一體化紅外接收頭有3個(gè)引腳，分別為5v電源，地和信號(hào)輸出引腳。注意：原理圖中信號(hào)輸出引腳為GPIO60,這是原理圖中的標(biāo)注

5、，實(shí)際上是龍芯1B處理器的GPIO61,這點(diǎn)很重要。原理圖中也有說(shuō)明，如下圖所示NOTE：GPiog GPIO1 GPIO2 GPIO3GPIO41CANQ_RX CANO二TX CAN1二TX DANI 二RX canQx UARTSTXGPIO38 GPIO39 81041GF1040GPIO41GPZ061子板按鍵子板按鍵子板按鍵BEEPSD CARD偵測(cè)紅外接收S1117-1.8VW83310G0*9V2.1.3. 一體化紅外接收頭原理左邊為遙控器發(fā)射的38khz的紅外信號(hào)，右邊為一體化紅外接收頭收到信號(hào)后，解調(diào)得到的信號(hào)。即沒(méi)有38khz紅外信號(hào)時(shí)，一體化紅外接收頭輸出高電平；有38

6、khz紅外信號(hào)時(shí)，輸出低電平。2.2. 迷你20鍵38K紅外遙控板2.2.1. 遙控器按鍵編碼表為了在linux驅(qū)動(dòng)中能夠正確解析遙控器的紅外命令，并判斷出具體是哪個(gè)按鍵被按下,必須知道遙控器按鍵編碼。這里選擇的這款遙控器的按鍵編碼是已知的，如下圖所示用戶碼:OOFF鍵位碼如下注意：第一行中間那個(gè)（編碼為46的）按鍵本遙控器沒(méi)有。其它的編碼都正確，詳細(xì)請(qǐng)看后面的測(cè)試結(jié)果。如果不幸沒(méi)有這個(gè)編碼表，只有通過(guò)示波器來(lái)找出每個(gè)按鍵的編碼值了。2.2.2. NEC編碼分析參考文檔全面了解紅外遙控（中文版）.pdf中給出了NEC編碼格式，如下圖所示1 00 1 101010 01101001 101000

7、011010 0 0 I III I II III I III II II I II Illi III II I I IjLSBMSSLSBSmsj wAddre$?MSB.LSBAddress-Command * MSBCommand針對(duì)這里使用的遙控器，對(duì)應(yīng)的編碼如下9m其中address就是用戶碼0x00，按鍵編碼為按鍵編碼表中的值，比如“開(kāi)關(guān)”按鍵的編碼值為0x45,“menu”按鍵的編碼值為0x47,“Test”按鍵的編碼值為0x44,“倒退”按鍵的編碼值為0x43等等。驅(qū)動(dòng)中要得到的就是按鍵編碼。上圖中的邏輯1'和邏輯0'對(duì)應(yīng)紅外接收頭信號(hào)引腳的高低電平，NEC編碼

8、規(guī)定:560us高電平+1690US低電平表示邏輯'1',560高電平+560低電平表示邏輯0'。如下圖NEC協(xié)說(shuō)根據(jù)脈沖時(shí)間艮短解得.林個(gè)膿沖為560ns氏的38KUZ戰(zhàn)波1約21個(gè)載波周期北 邏輯”“脈沖時(shí)間為工25惠!邏輯中叫冰沖時(shí)間為L(zhǎng)12ms.推薦的載波周期為14或者L3：3 .源碼分析3.1. 主要思路簡(jiǎn)單來(lái)說(shuō)，應(yīng)用程序執(zhí)行read()函數(shù)，然后阻塞，直到有紅外命令并解析后，驅(qū)動(dòng)才將獲取的“按鍵編碼”返回給應(yīng)用程序，應(yīng)用程序的read()才返回。獲取按鍵編碼的方法是：一體化紅外接收頭在收到遙控器信號(hào)后，在信號(hào)輸出引腳輸出高低電平，并產(chǎn)生中斷，中斷程序中計(jì)算兩

9、次中斷間隔的時(shí)間如果為2.25ms則表示邏輯1',間隔時(shí)間為1.12ms則為邏輯0',再轉(zhuǎn)換為4字節(jié)的十六進(jìn)制，其中第三字節(jié)為按鍵編碼。在實(shí)現(xiàn)上，為了實(shí)現(xiàn)快速中斷，使用了tasklet機(jī)制。在中斷程序中只記錄了當(dāng)前時(shí)間，就調(diào)用中斷的下半部并返回了。在下半部中計(jì)算兩次中斷的時(shí)間間隔并保存起來(lái)。為了判斷一條紅外命令是否結(jié)束，這里采用了一個(gè)內(nèi)核定時(shí)器，如果兩次中斷時(shí)間超過(guò)50ms,則認(rèn)為一條紅外命令已經(jīng)結(jié)束。這里沒(méi)有考慮按鍵一直按住遙控器會(huì)在110ms發(fā)射重復(fù)碼的情況，所以最長(zhǎng)的間隔時(shí)間為引導(dǎo)碼的9ms,即這里把定時(shí)器超時(shí)時(shí)間設(shè)置為50ms是合理的，經(jīng)過(guò)實(shí)際測(cè)試也證明了這點(diǎn)。3.2.

10、 阻塞IO在接收完一條紅外命令后，應(yīng)該喚醒驅(qū)動(dòng)中的read()函數(shù)，并將解析結(jié)果返回給應(yīng)用程序。這里采用的是wake_up_interruptible()和wait_event_interruptible()的形式，具體參考LDD3的第六章第二節(jié)BlockingI/O,相關(guān)原文截圖如下Li0£1evice-lritfcrs=3rd=Iditian粵薇留中iee/632+125%,XXrenowknmvenoughtolookatasimpleexanipJt:otsleeping;mdwakingup.Irithesamplesource,youcanfindamodulecalle

11、dsleepy.Itimplementsadevicewithsin-plcbehavior；anyprocess【hataicemptsiureadfromthedeviceisputtosleep.Wheneveraprocesswrites2thedevice,allsleepingprocessesareawakened.Thisbehaviorisimplementedwithrhefollowingicudmulk廣methods；staticDECLAN£_WMI_Q(JEUE_HEAD(wq);staticintflag«Oj$size_tsleepyrea

12、d($tructfileilp,char_u$er"buf.5ize_tount,loff_t(prlntk(KERN_DBUG"processZi(Xs)goingGc即In".current->pid>current-omni);wait_event_inteiruptible(wqtflagl0)；Hag-Ojprintk(KERN_DEBUG''aHuken"cjrient-ipidturrent-icomni);returnG；/*EOF*/jsiietsleepywrite(structfileconstchar_

13、usertbufjcount,Lo+ft*jpos)(printk(KLRN_D£BUG"process%i(Xs)awakeningthereaders.An"»current->piicurrent->coimi);Hag-1;wakc_up_iftterruptible(Swq);returncount;/*succeeditoavoidretrial*/)NotetheuseofrheHagvariableinthisexample.Sincewait_event_interruptiblechecksforaconditiontha

14、tmustbecometrueTweusefkgtocreatethatcondition.Itisinterestingtoconsiderwhathappensiftwoprocessesarewaitingwheniscalled.Sincesleepyjrcadresetsflgco0onceitwakesup,youmightthinkchatthesecondprocesstowakeupwouldimmediatelygobacktosleep.Onasingle-processor截圖已經(jīng)完整展示了wait_event()的使用方法。3.3. 中斷的上下半部這里也按照規(guī)范把中斷

15、實(shí)現(xiàn)分為上半部和下半部。實(shí)現(xiàn)方式有tasklet和workqueue,這兩種方式的區(qū)別是tasklet在軟中斷上下文中執(zhí)行，很快，是以原子模式執(zhí)行，但是workqueue可以休眠。LDD3中經(jīng)典原文如下ctubkdduritij;executionoithebottonhaltihjfswhyhrunsatasatertime.Incherypicalscenario,thetophalfsavesdevicedatacoadevice-speuifitbuffer*schedulesitshottoinhalt,andexits：thisoperationisveryfast.Thebott

16、omhjltthenperformswhdtevtrotlwr謁”rk圖required,suchasakciiitproccbes*stdriingupanother1'Qoperanon,andsoon.Thissetuppermirsdietophalftoserviceanewinterruptwhilethebattomhalfisstillworking.Alm”耳cv<iy"'Iin%iiikiiup：hjiiiilt.：is可由【i：nsm訃,1hm弋聞八一whenjm：-workinterfacereportsrhe口nivalofanewpa

17、cket,rhehandlerjustretrievesthednlii3ndpushtsi(uptochtprococo!layer;actualprocessingofchepacketi$perfbemedmabotronrihalf.TheLinuxkernelhastwodifferentmechanismsthatmaybeusedtoimplementboi-ronfi-halfprocessing,bothofwhichwereintroducedinChapter7,Tasklctsarcotrentht：preferredmechanismforbottom-halfpro

18、cessing：theyart?veryfdst,butalltaskktcodemustbtaiomicThtjlicrnativctotisklctsiswcirkquciics.tvhichmayhavea11版1】“LnwKThu【chaiareallowed凸帛lekmTasklet的使用方法也在LDD3中可以找到，如下所示TskktsmustbedrehredwilhtheDECLARETASKLETinieru：DECLMETASKLETCname.function,datj);nameisthenum亡tobe卬tntothetasklet1functionisthefunct

19、ionthatiscjllcdtoextcincthe(mtake、uneunsignedlongargiinieniandminiwnold】.貓ndd5taisanunsignedlongvaluetnbepassedrnchi;必山1門(mén)funcrion.TheshortdriverdeclaresitstaskletastoIlows；void$boit_dc_tasklet(unsignedlong);DtCLARTASKLET(5hort_t*sklctfsfiortdotasklet+o);ThefunctiontasHeudied曲isusedtoscheduleatasklec

20、forrunning.If阜kortisloadedwithtasklet1,itinstallsadi說(shuō)rentinterruprhandlerthatsavesdataand乂hZuk$thela5kkia5follows:i:rqi：Etnini_tihoit_tl_iritcriupt(intiiqvoid*dcv_id#&Lfuctpt_fEg£*lcgi)do_gettimcofdeiy(struettimeval*)1v_bead);/*ssttostop'volartile'warning*/short_incT_tv(M*_hea(i);ta

21、skletschedule(Ssfiorttasklet);shortwqcount;/*rLoidthatanirtcuuptairived*/returnliq_HWLED;)TheActualtki5klcLroumit.&hort_dij_tdskiet,willbttxtcuitdshortly(sospeak)江【thesystemsconvenien<xj.Asinenrioned甘八flm,hisroiiTineperformsthebulkoftheworkothandlingtheinterrupt;itlookslikethis:voidshort_do_t

22、asklet(urignedIwg-M(intdvcLouiltshoft_bKCDun11wjiLLtni；shortwq_count仁q；/*wphavealreadybeeniemav?dItoaitheqiue7P*Thebottwrtdththetvmayjfilledbythetophjlfj3.4. 內(nèi)核定時(shí)器同樣，LDD3中也有內(nèi)核定時(shí)器的相關(guān)介紹，如下所示。TheTimerAPIThekernelprovidesdriverswithanumberoftunctionsiodeclare,register,andremovekernelriinurs.Thefollowing

23、excerptshowsthebasicbuildingblocks:#includedinijx/timer.h>structtimerlist(unsignedlongexpires;void(*function)(unsignedlong);unsignedlongdata;)；voidinit_tinier(structtimer_list*timer);structtiplistTIMERJNITIALIZER(function,expire_data);voidackl_tin»er(structtimerlist*timer);intdel_tiflier(5tr

24、iicttimer:，ttiwr);4 .運(yùn)行效果4.1. 打開(kāi)調(diào)試開(kāi)關(guān)的效果Freeingunusedkernelmemory:184kfreedAlgorithmics/MIPSFPUEmulatorv1.5#mountall.#Startingmdev.Processing/etc/profile.Done!LOONSONLoongson-gz:/#echo8>/proc/sys/kernel/printkLOONSONLoongson-gz:/#cdtest/LOONSONLoongson-gz:/test#./ls1b_ir_test_apponecmdinterval=0,i

25、nteval_binary=2interval=13437,inteval_binary=2interval=1084,inteval_binary=0interval=1149,inteval_binary=0interval=1084,inteval_binary=0interval=1119,inteval_binary=0interval=1154,inteval_binary=0interval=1084,inteval_binary=0interval=1119,inteval_binary=0interval=1125,inteval_binary=0interval=2261,

26、inteval_binary=1interval=2235,inteval_binary=1interval=2226,inteval_binary=1interval=2258,inteval_binary=1interval=2210,inteval_binary=1interval=2274,inteval_binary=1interval=2208,inteval_binary=1interval=2258,inteval_binary=1interval=2225,inteval_binary=1interval=1123,inteval_binary=0interval=2236,

27、inteval_binary=1interval=1143,inteval_binary=0interval=1095,inteval_binary=0interval=1117,inteval_binary=0interval=2259,inteval_binary=1interval=1104,inteval_binary=0interval=1107,inteval_binary=0interval=2277,inteval_binary=1interval=1082,inteval_binary=0interval=2261,inteval_binary=1interval=2220,

28、inteval_binary=1interval=2267,inteval_binary=1interval=1095,inteval_binary=0interval=2262,inteval_binary=1interval=40320,inteval_binary=2interval=11203,inteval_binary=2ircmdcode=0x0,0xff,0x45,0xbaendkey=0x45onecmdinterval=0,inteval_binary=2interval=13422,inteval_binary=2interval=1092,inteval_binary=

29、0interval=1153,inteval_binary=0interval=1081,inteval_binary=0interval=1119,inteval_binary=0interval=1123,inteval_binary=0interval=1144,inteval_binary=0interval=1097,inteval_binary=0interval=1121,inteval_binary=0interval=2246,inteval_binary=1interval=2225,inteval_binary=1interval=2281,inteval_binary=

30、1interval=2204,inteval_binary=1interval=2259,inteval_binary=1interval=2246,inteval_binary=1interval=2209,inteval_binary=1interval=2263,inteval_binary=1interval=1099,inteval_binary=0interval=1120,inteval_binary=0interval=2267,inteval_binary=1interval=1097,inteval_binary=0interval=1106,inteval_binary=

31、0interval=1154,inteval_binary=0interval=2204,inteval_binary=1interval=1154,inteval_binary=0interval=2207,inteval_binary=1interval=2274,inteval_binary=1interval=1084,inteval_binary=0interval=2243,inteval_binary=1interval=2265,inteval_binary=1interval=2235,inteval_binary=1interval=1100,inteval_binary=

32、0interval=2228,inteval_binary=1ircmdcode=0x0,0xff,0x44,0xbbendkey=0x44onecmdinterval=0,inteval_binary=2interval=13435,inteval_binary=2interval=1082,inteval_binary=0interval=1104,inteval_binary=0interval=1156,inteval_binary=0interval=1098,inteval_binary=0interval=1101,inteval_binary=0interval=1125,in

33、teval_binary=0interval=1157,inteval_binary=0interval=1082,inteval_binary=0interval=2273,inteval_binary=1interval=2211,inteval_binary=1interval=2258,inteval_binary=1interval=2226,inteval_binary=1interval=2254,inteval_binary=1interval=2209,inteval_binary=1interval=2279,inteval_binary=1interval=2204,in

34、teval_binary=1interval=2259,inteval_binary=1interval=2254,inteval_binary=1interval=2206,inteval_binary=1interval=1123,inteval_binary=0interval=1140,inteval_binary=0interval=1097,inteval_binary=0interval=1120,inteval_binary=0interval=1140,inteval_binary=0interval=1100,inteval_binary=0interval=1122,in

35、teval_binary=0interval=1106,inteval_binary=0interval=2263,inteval_binary=1interval=2258,inteval_binary=1interval=2199,inteval_binary=1interval=2278,inteval_binary=1interval=2204,inteval_binary=1interval=40346,inteval_binary=2interval=11205,inteval_binary=2ircmdcode=0x0,0xff,0x7,0xf8endkey=0x7onecmdi

36、nterval=0,inteval_binary=2interval=13428,inteval_binary=2interval=1110,inteval_binary=0interval=1086,inteval_binary=0interval=1118,inteval_binary=0interval=1156,inteval_binary=0interval=1080,inteval_binary=0interval=1122,inteval_binary=0interval=1123,inteval_binary=0interval=1143,inteval_binary=0int

37、erval=2222,inteval_binary=1interval=2259,inteval_binary=1interval=2205,inteval_binary=1interval=2277,inteval_binary=1interval=2208,inteval_binary=1interval=2258,inteval_binary=1interval=2252,inteval_binary=1interval=2205,inteval_binary=1interval=1125,inteval_binary=0interval=2260,inteval_binary=1int

38、erval=2233,inteval_binary=1interval=1102,inteval_binary=0interval=2228,inteval_binary=1interval=1155,inteval_binary=0interval=1100,inteval_binary=0interval=1104,inteval_binary=0interval=2283,inteval_binary=1interval=1081,inteval_binary=0interval=1121,inteval_binary=0interval=2245,inteval_binary=1int

39、erval=1119,inteval_binary=0interval=2265,inteval_binary=1interval=2218,inteval_binary=1interval=2260,inteval_binary=1interval=40305,inteval_binary=2interval=11217,inteval_binary=2ircmdcode=0x0,0xff,0x16,0xe9endkey=0x16onecmdinterval=0,inteval_binary=2interval=13420,inteval_binary=2interval=1093,inte

40、val_binary=0interval=1102,inteval_binary=0interval=1157,inteval_binary=0interval=1098,inteval_binary=0interval=1104,inteval_binary=0interval=1125,inteval_binary=0interval=1154,inteval_binary=0interval=1084,inteval_binary=0interval=2245,inteval_binary=1interval=2250,inteval_binary=1interval=2254,inte

41、val_binary=1interval=2218,inteval_binary=1interval=2243,inteval_binary=1interval=2222,inteval_binary=1interval=2284,inteval_binary=1interval=2204,inteval_binary=1interval=1149,inteval_binary=0interval=1084,inteval_binary=0interval=2277,inteval_binary=1interval=2204,inteval_binary=1interval=1120,inte

42、val_binary=0interval=1139,inteval_binary=0interval=1102,inteval_binary=0interval=1118,inteval_binary=0interval=2262,inteval_binary=1interval=2205,inteval_binary=1interval=1155,inteval_binary=0interval=1099,inteval_binary=0interval=2230,inteval_binary=1interval=2260,inteval_binary=1interval=2254,inte

43、val_binary=1interval=2209,inteval_binary=1interval=40339,inteval_binary=2interval=11196,inteval_binary=2ircmdcode=0x0,0xff,0xc,0xf3endkey=0xc4.2. 不打開(kāi)調(diào)試開(kāi)關(guān)的效果devtmpfs:mountedFreeingunusedkernelmemory:184kfreedAlgorithmics/MIPSFPUEmulatorv1.5#mountall.#Startingmdev.Processing/etc/profile.Done!LOONSONLo

44、ongson-gz:/#/test/ls1b_ir_test_appkey=0x45key=0x44key=0x7key=0x16key=0xckey=0x8key=0x42key=0x40key=0x15key=0x19key=0x18key=0x1ckey=0x52key=0x47key=0x43key=0x9key=0xdkey=0x5ekey=0x5akey=0x4aACLOONSONLoongson-gz:/#5 .源碼清單5.1. 驅(qū)動(dòng)程序5.1.1.ls1b_ir.h#ifndef_LS1B_IR_H_#define_LS1B_IR_H_#endif5.1.2.ls1b_ir.c

45、#include<linux/platform_device.h>#include<linux/interrupt.h>#include<linux/ioport.h>#include<linux/miscdevice.h>#include<linux/delay.h>#include<linux/signal.h>#include<linux/sched.h>#include<linux/fs.h>#include<linux/time.h>#include<linux/errn

46、o.h>#include<ls1b_board.h>#include<ls1b_board_int.h>#include<asm/segment.h>#include<asm/ioctl.h>#include<asm/uaccess.h>#include"ls1b_ir.h"/一體化紅外接收頭所在引腳#defineGPIO_IR61/如果一個(gè)中斷后一定時(shí)間還未發(fā)生中斷，則認(rèn)為一條紅外命令已經(jīng)結(jié)束/本驅(qū)動(dòng)是針對(duì)20鍵迷你紅外遙控器的，/該款遙控器使用NEC協(xié)議，該遙控器最長(zhǎng)的是9ms的引導(dǎo)碼/暫不考慮重復(fù)碼的情

47、況/注意超時(shí)時(shí)間一定要加上jiffies#defineLS1B_IR_ONE_CMD_TIME_OUT(jiffies+HZ/20)/50ms/阻塞IODECLARE_WAIT_QUEUE_HEAD(ls1b_ir_wate_queue);/中斷下半部voidls1b_ir_do_tasklet(unsignedlong);DECLARE_TASKLET(ls1b_ir_tasklet,ls1b_ir_do_tasklet,0);/如果一個(gè)中斷后一定時(shí)間還未發(fā)生中斷，則認(rèn)為一條紅外命令已經(jīng)結(jié)束staticstructtimer_listls1b_ir_one_cmd_timer;/static

48、spinlock_tls1b_ir_lock=SPIN_LOCK_UNLOCKED;staticDEFINE_SPINLOCK(ls1b_ir_lock);staticstructresource*ls1b_ir_res=NULL;staticstructls1bboardintcregsvolatile*ls1bboardint0regs=(structls1b_board_intc_regsvolatile*)(KSEG1ADDR(LS1B_BOARD_INTREG_BASE);staticunsignedintls1b_ir_irq=0;/中斷時(shí)間/最近一條中斷發(fā)生的時(shí)間/倒數(shù)第二條中斷

49、發(fā)生的時(shí)間staticstructtimevalls1b_ir_current_tv=0,0;staticstructtimevalls1b_ir_last_tv=0,0;/一條紅外命令的基本信息(512)/ 一條紅外命令最(2250) / 2.25ms 左右為 1(1120) / 1.12ms 左右為 0(200)/ 0.2ms作為誤差界限LS1B_IR_BIT_1_INTERV AL_MIN#defineLS1B_IR_ONE_CMD_MAX_INTERVAL_NUM大的中斷次數(shù)#defineLS1B_IR_ONE_CMD_CODE_MAX_LEN#defineLS1B_IR_BIT_1_

50、INTERVAL#defineLS1B_IR_BIT_0_INTERVAL#defineLS1B_IR_BIT_ERROR_SCOPE#define(LS1B_IR_BIT_1_INTERVAL-LS1B_IR_BIT_ERROR_SCOPE)#defineLS1B_IR_BIT_1_INTERVAL_MAX(LS1B_IR_BIT_1_INTERVAL+LS1B_IR_BIT_ERROR_SCOPE)#defineLS1B_IR_BIT_0_INTERVAL_MIN(LS1B_IR_BIT_0_INTERVAL-LS1B_IR_BIT_ERROR_SCOPE)#defineLS1B_IR_B

51、IT_0_INTERVAL_MAX(LS1B_IR_BIT_0_INTERVAL+LS1B_IR_BIT_ERROR_SCOPE)與標(biāo)準(zhǔn)的2.25ms或1.12ms相比，超過(guò)0.2ms則為非法值typedefenumLS1B_IR_BIT_0=0,/對(duì)應(yīng)的間隔時(shí)間為2.05ms至ij2.45msLS1B_IR_BIT_1=1,/對(duì)應(yīng)的間隔時(shí)間為0.92ms到1.32msLS1B_IR_BIT_INVALID=2,/不在以上兩個(gè)范圍內(nèi)的所有間隔時(shí)間LS1B_IR_BIT_VALUE_ENUM;/每次間隔在一條紅外命令碼中的具體含義本20鍵38k迷你紅外遙控器采用的是NEC編碼/具體編碼規(guī)則為1b

52、it引導(dǎo)碼+2byte用戶碼（固定為0x00ff）+1byte命令碼+1byte命令反碼typedefenum/ 1bit引導(dǎo)碼/ 2byte的用戶碼（固定為0x00ff）/ 1byte命令碼/ 1byte命令碼反碼/緩存中的第一個(gè)間隔固定為0LS1B_IR_BIT_USER_CODE_BYTE_0=0,LS1B_IR_BIT_USER_CODE_BYTE_1,LS1B_IR_BIT_CMD_CODE,LS1B_IR_BIT_CMD_OPPOSITE_CODE,LS1B_IR_BIT_CODE_ENUM;typedefstruct/相鄰中斷的間隔unsignedintintevalLS1B_I

53、R_ONE_CMD_MAX_INTERVAL_NUM;/根據(jù)間隔長(zhǎng)度，轉(zhuǎn)換為具體的0或者1/2.25ms左右，則為1;1.12ms左右則為0unsignedcharinteval_binaryLS1B_IR_ONE_CMD_MAX_INTERVAL_NUM;/十六進(jìn)制的編碼值，由inteval_binary轉(zhuǎn)換得到unsignedcharcodeLS1B_IR_ONE_CMD_CODE_MAX_LEN;unsignedintinterval_num;/有效間隔的總個(gè)數(shù)LS1B_IR_ONE_CMD_STRU;LS1B_IR_ONE_CMD_STRUls1b_ir_cmd_buff;/接收完一條

54、紅外命令typedefenumLS1B_IR_ONE_CMD_RECEIVE_OK=0,LS1B_IR_ONE_CMD_RECEIVE_NOT_OK=1,LS1B_IR_ONE_CMD_RECEIVE_ENUM;staticintls1b_ir_one_cmd_received_ok_flag=LS1B_IR_ONE_CMD_RECEIVE_NOT_OK;/一條紅外命令的第一次中斷標(biāo)志typedefenumLS1B_IR_ONE_CMD_FIRST_INTR_INIT=0,LS1B_IR_ONE_CMD_FIRST_INTR_TRUE=1,LS1B_IR_ONE_CMD_FIRST_INTR_

55、FALSE=2,LS1B_IR_ONE_CMD_FIRST_INTR_FLAG;staticintls1b_ir_one_cmd_first_flag=LS1B_IR_ONE_CMD_FIRST_INTR_INIT;voidls1b_ir_one_cmd_timer_stop(void);/初始化定時(shí)器voidls1b_ir_one_cmd_timer_init(void)init_timer(&ls1b_ir_one_cmd_timer);/定時(shí)器超時(shí)處理器函數(shù)voidls1b_ir_one_cmd_timer_handler(unsignedlongdata)/停止定時(shí)器ls1b_ir_one_cmd_timer_stop();/重置標(biāo)志ls1b_ir_one_c