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<script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="yswiusi" id="container"> <section> <article> <h1>嵌入式Linux設(shè)備驅(qū)動(dòng)開發(fā)之：GPIO驅(qū)動(dòng)程序?qū)嵗?/h1> <div id="cwqswwm" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2013-09-13</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="wicmiou" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="cwisoes" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="kmgsmcs" class="content" id="contentDiv" style="position:relative;"> <div id="yaewsqw" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p></p>本文引用地址：<a href="http://www.ex-cimer.com/article/257110.htm">http://www.ex-cimer.com/article/257110.htm</a><h2>11.3<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/GPIO驅(qū)動(dòng)程序"><em>GPIO驅(qū)動(dòng)程序</em></a>實(shí)例</h2><h3>11.3.1GPIO工作原理</h3><p>FS2410開發(fā)板的S3C2410處理器具有117個(gè)多功能通用I/O（GPIO）端口管腳，包括GPIO8個(gè)端口組，分別為GPA（23個(gè)輸出端口）、GPB（11個(gè)輸入/輸出端口）、GPC（16個(gè)輸入/輸出端口）、GPD（16個(gè)輸入/輸出端口）、GPE（16個(gè)輸入/輸出端口）、GPF（8個(gè)輸入/輸出端口）、GPH（11個(gè)輸入/輸出端口）。根據(jù)各種系統(tǒng)設(shè)計(jì)的需求，通過軟件方法可以將這些端口配置成具有相應(yīng)功能（例如：外部中斷或數(shù)據(jù)總線）的端口。</p><p></p><p>為了控制這些端口，S3C2410處理器為每個(gè)端口組分別提供幾種相應(yīng)的控制寄存器。其中最常用的有端口配置寄存器（GPACON~GPHCON）和端口數(shù)據(jù)寄存器（GPADAT~GPHDAT）。因?yàn)榇蟛糠諭/O管腳可以提供多種功能，通過配置寄存器（PnCON）設(shè)定每個(gè)管腳用于何種目的。數(shù)據(jù)寄存器的每位將對應(yīng)于某個(gè)管腳上的輸入或輸出。所以通過對數(shù)據(jù)寄存器（PnDAT）的位讀寫，可以進(jìn)行對每個(gè)端口的輸入或輸出。</p><p></p><p>在此主要以發(fā)光二極管（LED）和蜂鳴器為例，討論GPIO設(shè)備的驅(qū)動(dòng)程序。它們的硬件驅(qū)動(dòng)電路的原理圖如圖11.4所示。</p><p style="text-align: center;"></p><p style="text-align: center;">圖11.4LED（左）和蜂鳴器（右）的驅(qū)動(dòng)電路原理圖</p><p></p><p>在圖11.4中，可知使用S3C2410處理器的通用I/O口GPF4、GPF5、GPF6和GPF7分別直接驅(qū)動(dòng)LEDD12、D11、D10以及D9，而使用GPB0端口驅(qū)動(dòng)蜂鳴器。4個(gè)LED分別在對應(yīng)端口（GPF4~GPF7）為低電平時(shí)發(fā)亮，而蜂鳴器在GPB0為高電平時(shí)發(fā)聲。這5個(gè)端口的數(shù)據(jù)流方向均為輸出。</p><p></p><p>在表11.15中，詳細(xì)描述了GPF的主要控制寄存器。GPB的相關(guān)寄存器的描述與此類似，具體可以參考S3C2410處理器數(shù)據(jù)手冊。</p><p>表11.15 GPF端口（GPF0-GPF7）的主要控制寄存器</p><table><tbody><tr><td style="width:71px;"><p>寄存器</p></td><td colspan="2" style="width:103px;"><p>地址</p></td><td style="width:67px;"><p>R/W</p></td><td style="width:178px;"><p>功能</p></td><td style="width:104px;"><p>初始值</p></td></tr><tr><td style="width:71px;"><p>GPFCON</p></td><td colspan="2" style="width:103px;"><p>0x56000050</p></td><td style="width:67px;"><p>R/W</p></td><td style="width:178px;"><p>配置GPF端口組</p></td><td style="width:104px;"><p>0x0</p></td></tr><tr><td style="width:71px;"><p>GPFDAT</p></td><td colspan="2" style="width:103px;"><p>0x56000054</p></td><td style="width:67px;"><p>R/W</p></td><td style="width:178px;"><p>GPF端口的數(shù)據(jù)寄存器</p></td><td style="width:104px;"><p>未定義</p></td></tr><tr><td style="width:71px;"><p>GPFUP</p></td><td colspan="2" style="width:103px;"><p>0x56000058</p></td><td style="width:67px;"><p>R/W</p></td><td style="width:178px;"><p>GPF端口的取消上拉寄存器</p></td><td style="width:104px;"><p>0x0</p></td></tr><tr><td style="width:71px;"><p>GPFCON</p></td><td style="width:102px;"><p>位</p></td><td colspan="4" style="width:350px;"><p>描述</p></td></tr><tr><td style="width:71px;"><p>GPF7</p></td><td style="width:102px;"><p>[15:14]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT711=保留</p></td></tr><tr><td style="width:71px;"><p>GPF6</p></td><td style="width:102px;"><p>[13:12]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT611=保留</p></td></tr><tr><td style="width:71px;"><p>GPF5</p></td><td style="width:102px;"><p>[11:10]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT511=保留</p></td></tr><tr><td style="width:71px;"><p>GPF4</p></td><td style="width:102px;"><p>[9:8]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT411=保留</p></td></tr><tr><td style="width:71px;"><p>GPF3</p></td><td style="width:102px;"><p>[7:6]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT311=保留</p></td></tr><tr><td style="width:71px;"><p>GPF2</p></td><td style="width:102px;"><p>[5:4]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT211=保留</p></td></tr><tr><td style="width:71px;"><p>GPF1</p></td><td style="width:102px;"><p>[3:2]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT111=保留</p></td></tr><tr><td style="width:71px;"><p>GPF0</p></td><td style="width:102px;"><p>[1:0]</p></td><td colspan="4" style="width:350px;"><p>00=輸入01=輸出10=EINT011=保留</p></td></tr></tbody></table><p></p><table><tbody><tr><td style="width:72px;"><p>GPFDAT</p></td><td style="width:108px;"><p>位</p></td><td style="width:384px;"><p>描述</p></td></tr><tr><td style="width:72px;"><p>GPF[7:0]</p></td><td style="width:108px;"><p>[7:0]</p></td><td style="width:384px;"><p>每位對應(yīng)于相應(yīng)的端口，若端口用于輸入，則可以通過相應(yīng)的位讀取數(shù)據(jù)；若端口用于輸出，則可以通過相應(yīng)的位輸出數(shù)據(jù)；若端口用于其他功能，則其值無法確定。</p></td></tr></tbody></table><p></p><table><tbody><tr><td style="width:72px;"><p>GPFUP</p></td><td style="width:108px;"><p>位</p></td><td style="width:384px;"><p>描述</p></td></tr><tr><td style="width:72px;"><p>GPF[7:0]</p></td><td style="width:108px;"><p>[7:0]</p></td><td style="width:384px;"><p>0：向相應(yīng)端口管腳賦予上拉(pull-up)功能</p><p>1：取消上拉功能</p></td></tr></tbody></table><p></p><p>為了驅(qū)動(dòng)LED和蜂鳴器，首先通過端口配置寄存器將5個(gè)相應(yīng)寄存器配置為輸出模式。然后通過對端口數(shù)據(jù)寄存器的寫操作，實(shí)現(xiàn)對每個(gè)GPIO設(shè)備的控制（發(fā)亮或發(fā)聲）。在下一個(gè)小節(jié)中介紹的驅(qū)動(dòng)程序中，s3c2410_gpio_cfgpin()函數(shù)和s3c2410_gpio_pullup()函數(shù)將進(jìn)行對某個(gè)端口的配置，而s3c2410_gpio_setpin()函數(shù)實(shí)現(xiàn)向數(shù)據(jù)寄存器的某個(gè)端口的輸出。</p> </span>  <div 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