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鎮ㄥソ锛屾杩庝締鍒扮董搴浕瀛愬競鍫寸恫(w菐ng) 鐧婚寗 | 鍏嶈不(f猫i)娉ㄥ唺

UART
闁辫畝锛�33106鏅�(sh铆)闁擄細2010-12-09 10:09:02

銆�銆�UART鍗崇偤Universal Asynchronous Receiver/Transmitter锛岃鐐�閫氱敤鐣版鏀剁櫦(f膩)鍣�銆俇ART鏄ō(sh猫)鍌欓枔閫�(j矛n)琛岀暟姝ラ�氫俊鐨勯棞(gu膩n)閸垫ā濉�锛岀敤浜庢帶鍒惰▓(j矛)绠楁(j墨)鑸囦覆琛岃ō(sh猫)鍌欑殑鑺墖銆傚畠鎻愪緵浜哛S-232C鏁�(sh霉)鎿�(j霉)绲傜瑷�(sh猫)鍌欐帴鍙ｏ紝閫欐ǎ瑷�(j矛)绠楁(j墨)灏卞彲浠ュ拰瑾�(di脿o)鍒�瑙ｈ(di脿o)鍣�鎴栧叾瀹冧娇鐢≧S-232C鎺ュ彛鐨勪覆琛岃ō(sh猫)鍌欓�氫俊浜�銆�

绨′粙

銆�銆�瑷�(j矛)绠楁(j墨)鑸囧閮ㄨō(sh猫)鍌欑殑閫ｆ帴锛屽熀鏈笂浣跨敤浜嗗叐椤炴帴鍙ｏ細涓茶鎺ュ彛鑸囧苟琛屾帴鍙�銆傚苟琛屾帴鍙ｆ槸鎸囨暩(sh霉)鎿�(j霉)鐨勫悇鍊�(g猫)浣嶅悓鏅�(sh铆)閫�(j矛n)琛屽偝閫侊紝鍏剁壒榛�(di菐n)鏄偝杓搁�熷害濉�锛屼絾鐣�(d膩ng)鍌宠几璺濋洟閬�(yu菐n)銆佷綅鏁�(sh霉)鍙堝鏅�(sh铆)锛岄�氫俊绶氳矾璁婂京(f霉)闆滀笖鎴愭湰鎻愰珮銆備覆琛岄�氫俊鏄寚鏁�(sh霉)鎿�(j霉)涓�浣嶄綅鍦伴爢搴忓偝閫侊紝鍏剁壒榛�(di菐n)鏄仼鍚堜簬閬�(yu菐n)璺濋洟閫氫俊锛岄�氫俊绶氳矾绨″柈锛屽彧瑕佷竴灏嶅偝杓哥窔灏卞彲浠ュ(sh铆)鐝�(xi脿n)闆欏悜閫氫俊锛屽緸鑰屽ぇ澶ч檷浣庝簡鎴愭湰銆�

銆�銆�涓茶閫氫俊鍙堝垎鐐虹暟姝ヨ垏鍚屾鍏╅銆俇ART锛圲niversal Asynchronous Receiver/Transmitter锛岄�氱敤鐣版鏀剁櫦(f膩)鍣級姝ｆ槸瑷�(sh猫)鍌欓枔閫�(j矛n)琛岀暟姝ラ�氫俊鐨勯棞(gu膩n)閸垫ā濉�銆傚畠鐨勯噸瑕佷綔鐢ㄥ涓嬫墍绀猴細

銆�銆�铏曠悊鏁�(sh霉)鎿�(j霉)绺借矾绶氬拰涓茶鍙ｄ箣闁撶殑涓�/骞躲�佸苟/涓茶綁(zhu菐n)鎻�锛�

銆�銆�閫氫俊闆欐柟鍙閲囩敤鐩稿悓鐨勫箑鏍煎紡鍜屾尝鐗圭巼锛屽氨鑳藉湪鏈叡浜檪(sh铆)閻樹俊铏熺殑鎯呮硜涓�锛屽儏鐢ㄥ叐鏍逛俊铏熺窔锛圧x 鍜孴x锛夊氨鍙互瀹屾垚閫氫俊閬庣▼锛�

銆�銆�閲囩敤鐣版鏂瑰紡锛屾暩(sh霉)鎿�(j霉)鏀剁櫦(f膩)瀹岀暍鍚庯紝鍙�氶亷涓柗鎴栫疆浣嶆(bi膩o)蹇椾綅鐨勬柟寮忛�氱煡寰帶鍒跺櫒閫�(j矛n)琛岃檿鐞�锛屽ぇ澶ф彁楂樺井鎺у埗鍣ㄧ殑宸ヤ綔鏁堢巼銆�

銆�銆�鑻ュ姞鍏ヤ竴鍊�(g猫)鍚堥仼鐨勯浕骞宠綁(zhu菐n)鎻涘櫒锛屽SP3232E銆丼P3485锛孶ART 閭勮兘鐢ㄤ簬RS-232銆丷S-485 閫氫俊锛屾垨鑸囪▓(j矛)绠楁(j墨)鐨勭鍙ｉ�ｆ帴銆俇ART 鎳�(y墨ng)鐢ㄩ潪甯稿唬娉�锛屾墜姗�(j墨)銆佸伐妤�(y猫)鎺у埗銆丳C 绛夋噳(y墨ng)鐢ㄤ腑閮借鐢ㄥ埌UART銆�

鍔熻兘

銆�銆�1锛� 鐧�(f膩)閫�/鎺ユ敹閭忚集

銆�銆�鐧�(f膩)閫侀倧杓皪寰炵櫦(f膩)閫丗IFO 璁�鍙栫殑鏁�(sh霉)鎿�(j霉)鍩�(zh铆)琛屸�滃苟鈫掍覆鈥濊綁(zhu菐n)鎻�?锛熷垈涓冨？瀣㈡暤閵庨箺鍢夎緣璋欓箠鎷囶啩褰㈡叮槌庮儘鈶惰厠槎�?j霉)鎺у埗瀵勫瓨鍣ㄤ腑宸茬法绋嬬殑閰嶇疆锛屾渻闈㈢穵璺熻憲鏁�(sh霉)鎿�(j霉)浣嶏紙娉ㄦ剰锛氫綅 LSB 鍏堣几鍑猴級銆佸鍋舵牎椹�(y脿n)浣嶅拰鍋滄浣嶃��

銆�銆�鍦ㄦ娓埌涓�鍊�(g猫)鏈夋晥鐨勮捣濮嬭剤娌栧悗锛屾帴鏀堕倧杓皪鎺ユ敹鍒扮殑浣嶆祦鍩�(zh铆)琛屸�滀覆鈫掑苟鈥濊綁(zhu菐n)鎻涖�傛澶栭倓鏈冨皪婧㈠嚭閷�(cu貌)瑾�銆佸鍋舵牎椹�(y脿n)閷�(cu貌)瑾�銆佸箑閷�(cu貌)瑾ゅ拰绶氫腑姝紙line-break锛夐尟(cu貌)瑾ら��(j矛n)琛屾娓紝骞跺皣妾㈡脯鍒扮殑鐙�鎱�(t脿i)闄勫姞鍒拌瀵叆鎺ユ敹FIFO 鐨勬暩(sh霉)鎿�(j霉)涓�銆�

銆�銆�2锛� 娉㈢壒鐜囩殑鐢�(ch菐n)鐢�

銆�銆�娉㈢壒鐜囬櫎鏁�(sh霉)锛坆aud-rate divisor锛夋槸涓�鍊�(g猫)22 浣嶆暩(sh霉)锛屽畠鐢�16 浣嶆暣鏁�(sh霉)鍜�6 浣嶅皬鏁�(sh霉)绲勬垚銆傛尝鐗圭巼鐧�(f膩)鐢熷櫒浣跨敤閫欏叐鍊�(g猫)鍊肩祫鎴愮殑鏁�(sh霉)瀛椾締姹哄畾浣嶅懆鏈�銆傞�氶亷甯舵湁灏忔暩(sh霉)娉㈢壒鐜囩殑闄ゆ硶鍣�锛屽湪瓒冲楂樼殑绯荤当(t菕ng)鏅�(sh铆)閻橀�熺巼涓�锛孶ART 鍙互鐢�(ch菐n)鐢熸墍鏈夋(bi膩o)婧�(zh菙n)鐨勬尝鐗圭巼锛岃�岃宸緢灏�銆�

銆�銆�3锛� 鏁�(sh霉)鎿�(j霉)鏀剁櫦(f膩)

銆�銆�鐧�(f膩)閫佹檪(sh铆)锛屾暩(sh霉)鎿�(j霉)琚鍏ョ櫦(f膩)閫丗IFO銆傚鏋淯ART 琚娇鑳�锛屽墖鏈冩寜鐓ч爯(y霉)鍏堣ō(sh猫)缃ソ鐨勫弮鏁�(sh霉)锛堟尝鐗圭巼銆佹暩(sh霉)鎿�(j霉)浣�銆佸仠姝綅銆佹牎椹�(y脿n)浣嶇瓑锛夐枊濮嬬櫦(f膩)閫佹暩(sh霉)鎿�(j霉)锛屼竴鐩村埌鐧�(f膩)閫丗IFO 涓矑鏈夋暩(sh霉)鎿�(j霉)銆備竴鏃﹀悜鐧�(f膩)閫丗IFO 瀵暩(sh霉)鎿�(j霉)锛堝鏋淔IFO 鏈┖锛夛紝UART 鐨勫繖妯�(bi膩o)蹇椾綅BUSY 灏辨湁鏁�锛屽苟涓斿湪鐧�(f膩)閫佹暩(sh霉)鎿�(j霉)鏈熼枔涓�鐩翠繚鎸佹湁鏁堛�侭USY 浣嶅儏鍦ㄧ櫦(f膩)閫丗IFO 鐐虹┖锛屼笖宸插緸绉讳綅瀵勫瓨鍣ㄧ櫦(f膩)閫佷竴鍊�(g猫)瀛楃锛屽寘鎷仠姝綅鏅�(sh铆)鎵嶈畩鐒℃晥銆傚嵆 UART 涓嶅啀浣胯兘锛屽畠涔熷彲浠ユ寚绀哄繖鐙�鎱�(t脿i)銆侭USY 浣嶇殑鐩搁棞(gu膩n)搴嚱鏁�(sh霉)鏄疷ARTBusy( )

銆�銆�鍦║ART 鎺ユ敹鍣ㄧ┖闁戞檪(sh铆)锛屽鏋滄暩(sh霉)鎿�(j霉)杓稿叆璁婃垚鈥滀綆闆诲钩鈥�锛屽嵆鎺ユ敹鍒颁簡璧峰浣嶏紝鍓囨帴鏀惰▓(j矛)鏁�(sh霉)鍣ㄩ枊濮嬮亱(y霉n)琛�锛屽苟涓旀暩(sh霉)鎿�(j霉)鍦˙aud16 鐨勭8 鍊�(g猫)鍛ㄦ湡琚噰妯�銆傚鏋淩x 鍦˙aud16 鐨勭8 鍛ㄦ湡浠嶇劧鐐轰綆闆诲钩锛屽墖璧峰浣嶆湁鏁�锛屽惁鍓囨渻琚獚(r猫n)鐐烘槸閷�(cu貌)瑾ょ殑璧峰浣嶅苟灏囧叾蹇界暐銆�

銆�銆�濡傛灉璧峰浣嶆湁鏁�锛屽墖鏍规摎(j霉)鏁�(sh霉)鎿�(j霉)瀛楃琚法绋嬬殑闀峰害锛屽湪 Baud16 鐨勬瘡绗� 16 鍊�(g猫)鍛ㄦ湡灏嶉�ｇ簩(x霉)鐨勬暩(sh霉)鎿�(j霉)浣嶏紙鍗充竴鍊�(g猫)浣嶅懆鏈熶箣鍚庯級閫�(j矛n)琛岄噰妯�銆傚鏋滃鍋舵牎椹�(y脿n)?z膩i)锛粸榧�?锛屽墖閭勬渻妾㈡脯濂囧伓鏍￠(y脿n)浣�銆�

銆�銆�锛屽鏋淩x 鐐洪珮闆诲钩锛屽墖鏈夋晥鐨勫仠姝綅琚⒑瑾�(r猫n)锛屽惁鍓囩櫦(f膩)鐢熷箑閷�(cu貌)瑾�銆傜暥(d膩ng)鎺ユ敹鍒颁竴鍊�(g猫)瀹屾暣鐨勫瓧绗︽檪(sh铆)锛屽皣鏁�(sh霉)鎿�(j霉)瀛樻斁鍦ㄦ帴鏀禙IFO 涓�銆�

銆�銆�4锛� 涓柗鎺у埗

銆�銆�鍑虹従(xi脿n)浠ヤ笅鎯呮硜鏅�(sh铆)锛屽彲浣縐ART 鐢�(ch菐n)鐢熶腑鏂凤細

銆�銆�FIFO 婧㈠嚭閷�(cu貌)瑾�

銆�銆�绶氫腑姝㈤尟(cu貌)瑾わ紙line-break锛屽嵆Rx 淇¤櫉涓�鐩寸偤0 鐨勭媭鎱�(t脿i)锛屽寘鎷牎椹�(y脿n)浣嶅拰鍋滄浣嶅湪鍏�(n猫i)锛�

銆�銆�濂囧伓鏍￠(y脿n)閷�(cu貌)瑾�

銆�銆�骞�閷�(cu貌)瑾わ紙鍋滄浣嶄笉鐐�1锛�

銆�銆�鎺ユ敹瓒呮檪(sh铆)锛堟帴鏀禙IFO 宸叉湁鏁�(sh霉)鎿�(j霉)浣嗘湭婊�锛岃�屽悗绾�(x霉)鏁�(sh霉)鎿�(j霉)闀锋檪(sh铆)闁撲笉渚嗭級

銆�銆�鐧�(f膩)閫�

銆�銆�鎺ユ敹

銆�銆�鐢变簬鎵�鏈変腑鏂蜂簨浠跺湪鐧�(f膩)閫佸埌涓柗鎺у埗鍣ㄤ箣鍓嶆渻涓�璧烽��(j矛n)琛屸�滄垨閬�(y霉n)绠椻�濇搷浣�锛屾墍浠ヤ换鎰忔檪(sh铆)鍒� UART 鍙兘鍚戜腑鏂风敘(ch菐n)鐢熶竴鍊�(g猫)涓柗璜嬫眰銆傞�氶亷鏌ヨ涓柗鐙�鎱�(t脿i)鍑芥暩(sh霉)UARTIntStatus( )锛岃粺浠跺彲浠ュ湪鍚屼竴鍊�(g猫)涓柗鏈嶅嫏(w霉)鍑芥暩(sh霉)閲岃檿鐞嗗鍊�(g猫)涓柗浜嬩欢锛堝鍊�(g猫)骞跺垪鐨刬f 瑾炲彞锛夈��

銆�銆�5锛� FIFO 鎿嶄綔 FIFO 鏄�淔irst-In First-Out鈥濈殑绺锛屾剰鐐衡�滃厛閫�(j矛n)鍏堝嚭鈥�锛屾槸涓�绋父瑕嬬殑闅�(du矛)鍒楁搷浣�銆� Stellaris 绯诲垪ARM 鐨刄ART 妯″鍖呭惈鏈�2 鍊�(g猫)16 瀛楃瘈(ji茅)鐨凢IFO锛氫竴鍊�(g猫)鐢ㄤ簬鐧�(f膩)閫�锛屽彟涓�鍊�(g猫)鐢ㄤ簬鎺ユ敹?锛熸ⅱ瑭暔钃氣偓(g猫)FIFO 鍒嗗垾閰嶇疆鐐轰互涓嶅悓娣卞害瑙哥櫦(f膩)涓柗?锛熸檼鈹粁鎿囩殑閰嶇疆鍖呮嫭锛�1/8銆� 1/4銆�1/2銆�3/4 鍜�7/8 娣卞害銆備緥濡�锛屽鏋滄帴鏀禙IFO 閬告搰1/4锛屽墖鍦║ART 鎺ユ敹鍒�4 鍊�(g猫)鏁�(sh霉)鎿�(j霉)鏅�(sh铆)鐢�(ch菐n)鐢熸帴鏀朵腑鏂�銆�

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