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title="設(shè)備驅(qū)動程序">設(shè)備驅(qū)動程序" title="設(shè)備驅(qū)動程序">設(shè)備驅(qū)動程序" title="設(shè)備驅(qū)動程序">設(shè)備驅(qū)動程序的編寫而耽誤外部硬件調(diào)試的時間，從而加快外部硬件設(shè)備調(diào)試速度，提高硬件開發(fā)調(diào)試效率。
??? 關(guān)鍵詞： 方法? μClinux? 硬件? 調(diào)試? 快速

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??? 在傳感器網(wǎng)絡(luò)節(jié)點(diǎn)中，采用了基于Linux的嵌入式操作系統(tǒng)。開發(fā)基于Linux操作系統(tǒng)的嵌入式微處理器應(yīng)用系統(tǒng)，關(guān)鍵是Linux 能夠訪問嵌入式處理器上擴(kuò)展連接的外部設(shè)備。一旦能夠訪問連接的外部芯片設(shè)備，就可以靈活地在Linux 上運(yùn)行對嵌入式系統(tǒng)外部設(shè)備的有關(guān)訪問控制應(yīng)用。
??? 文獻(xiàn)[1～3]對Linux在個人PC機(jī)上的設(shè)備驅(qū)動框架作了介紹。文獻(xiàn)[4]介紹了μClinux中訪問嵌入式系統(tǒng)外部設(shè)備的設(shè)備驅(qū)動方式的框架。不過對于設(shè)備驅(qū)動程序的操作函數(shù)的實(shí)現(xiàn)由于與具體的外設(shè)備硬件有關(guān)，沒有實(shí)現(xiàn)的具體統(tǒng)一方案。設(shè)備驅(qū)動方式采用通用的文件訪問方式操作設(shè)備，這給對硬件底層不了解的高層用戶的程序設(shè)計(jì)帶來了方便。但對于硬件的設(shè)計(jì)和調(diào)試人員來說，不了解底層硬件的操作就無法實(shí)現(xiàn)設(shè)備的訪問。硬件設(shè)計(jì)人員必須實(shí)現(xiàn)訪問函數(shù)的具體操作過程，以達(dá)到對外部擴(kuò)展設(shè)備的訪問測試和靈活控制。也就是說，先要完成設(shè)備驅(qū)動程序，然后才能進(jìn)行下一步的硬件設(shè)備調(diào)試。
??? 編寫和實(shí)現(xiàn)設(shè)備驅(qū)動程序必須先了解和實(shí)現(xiàn)對設(shè)備底層的訪問，這是個復(fù)雜的過程。先要掌握處理器如何尋址外部設(shè)備、如何配置外部設(shè)備；再實(shí)現(xiàn)底層的地址訪問函數(shù)；然后再編寫設(shè)備驅(qū)動程序的實(shí)現(xiàn)函數(shù)，進(jìn)而編寫設(shè)備驅(qū)動程序；將驅(qū)動程序編譯進(jìn)Linux操作系統(tǒng)內(nèi)核；最后在Linux系統(tǒng)中通過標(biāo)準(zhǔn)的設(shè)備訪問方式訪問外部設(shè)備。
??? 采用設(shè)備驅(qū)動方式需要很多時間，以至于耽誤硬件設(shè)計(jì)調(diào)試的進(jìn)程。另一方面，由于應(yīng)用于嵌入式的Linux不支持動態(tài)的加載設(shè)備驅(qū)動模塊，只能將設(shè)備的模塊編譯進(jìn)Linux內(nèi)部，也就是要將設(shè)備驅(qū)動程序重新編譯進(jìn)用于嵌入式的Linux內(nèi)核中。為此采用驅(qū)動方式又增加了內(nèi)核的代碼。
??? 在μClinux操作系統(tǒng)中，可以采用直接物理地址訪問外部擴(kuò)展設(shè)備，針對設(shè)備寄存器的地址單元進(jìn)行讀寫操作，直接與硬件接觸，而且便于從最底層了解設(shè)備的工作方式，加快開發(fā)調(diào)試產(chǎn)品的速度。該方法僅僅修改少量的代碼，采用直接地址的訪問方式能夠快速完成對外設(shè)備的訪問測試。與設(shè)備驅(qū)動方式相比，重新編譯后使內(nèi)核代碼增加較少。而在μClinux中要采用直接物理地址的外部設(shè)備訪問，需要修改啟動代碼，建立設(shè)備訪問函數(shù)，需要一定技巧。本文以Motorola的ColdFire MCF5272^[5] 嵌入式微處理器平臺為例，介紹了μClinux對外部設(shè)備的快速訪問方法。
1 存儲空間編址
??? 對于μClinux 來說，其設(shè)計(jì)是針對沒有MMU(Memory Manage Unit)的處理器，即μClinux 不能使用處理器的虛擬內(nèi)存管理技術(shù)。μClinux采用存儲器的分頁管理，系統(tǒng)在啟動時把實(shí)際存儲器進(jìn)行分頁。在加載應(yīng)用程序時程序分頁加載。但由于沒有MMU管理，實(shí)際上μClinux采用實(shí)存儲器管理策略。
??? μClinux系統(tǒng)對于內(nèi)存的訪問是直接的，它對地址的訪問不需要經(jīng)過MMU，而是直接送到地址線上輸出，所有程序中訪問的地址都是實(shí)際的物理地址。操作系統(tǒng)對內(nèi)存空間沒有保護(hù)，各個進(jìn)程實(shí)際上共享一個運(yùn)行空間。
??? μClinux 采用了實(shí)內(nèi)存模式，各個內(nèi)存段在物理內(nèi)存（沒有虛存）層面都是連續(xù)的，其內(nèi)存空間的地址映像如圖1。

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??? 修改啟動代碼和實(shí)現(xiàn)訪問函數(shù)，其中寄存器CSBR2指明了映像的內(nèi)存起始地址、映像的內(nèi)存容量、總線寬度等。重新編譯?滋Clinux內(nèi)核，并將生成的下載文件燒寫到FLASH中，重新上電在內(nèi)核運(yùn)行起來后(或者mount上宿主機(jī)硬盤手動啟動μClinux內(nèi)核^[6])，通過編制一段C語言的測試程序，調(diào)用設(shè)備訪問函數(shù)，即可對外部設(shè)備芯片的寄存器進(jìn)行讀寫。下面是一段測試程序test.c。
#include
#include 'io.h'?? ?????? //包含定義的設(shè)備訪問函數(shù)
int? main(void)
{
??? printf('Vint_source:0x%xn',inb(0xffa00000+0x0d));//讀寄存器Vint_source初始值
??? printf('Vbv_initial:0x%xn',inb(0xffa00000+0x18));//讀寄存器Vbv_initial初始值
??? printf('Vquality:0x%xn',inb(0xffa00000+0x19)); //讀寄存器Vquality的初始值
??? printf('Vin_cntl:0x%xn',inb(0xffa00000+0x21));//讀寄存器Vin_cntl的初始值
??? printf('Vsize_h:0x%xn',inb(0xffa00000+ 0x24));//讀寄存器Vsize_h的初始值
??? outb(0x7f,0xffa00000+0x18));//向寄存器Vbv_initial寫入值0x7f
??? outb(0x1f,0xffa00000+0x19)); //向寄存器Vquality寫入值0x1f
??? outb(0x7f,0xffa00000+0x21)); //向寄存器Vin_cntl寫入值0x7f
??? outb(0x2d,0xffa00000+ 0x24)); //向寄存器Vsize_h寫入值0x2d
??? printf('Vbv_initial:0x%xn',inb(0xffa00000+0x18)); //讀寄存器Vbv_initial的值
??? printf('Vquality:0x%xn',inb(0xffa00000+0x19)); //讀寄存器Vquality的值
??? printf('Vin_cntl:0x%xn',inb(0xffa00000+0x21));//讀寄存器Vin_cntl的值
??? printf('Vsize_h:0x%xn',inb(0xffa00000+ 0x24));//讀寄存器Vsize_h的值
??? return;
??? }
??? 該測試程序先讀出外部設(shè)備上電的初始值；再對外芯片的可讀寫寄存器進(jìn)行寫操作，后讀出寫入的值。在宿主機(jī)Linux系統(tǒng)的minicom調(diào)試窗口中mount上宿主機(jī)硬盤，運(yùn)行編譯好的test程序，得到該測試程序的輸出。讀出的初始化值與外部設(shè)備手冊上的值完全一樣，并且寫入外部設(shè)備寄存器的值與而后讀出的值也完全相同。
??? 通過測試檢驗(yàn)說明設(shè)備訪問函數(shù)能夠按物理地址訪問外部設(shè)備。比較設(shè)備驅(qū)動程序方法，該方法可以在較短時間正確訪問外部設(shè)備，這樣對硬件調(diào)試人員來說節(jié)約了時間，可以快速進(jìn)行硬件的開發(fā)調(diào)試，而不是等待編寫好設(shè)備驅(qū)動程序后才調(diào)試硬件，編寫設(shè)備驅(qū)動程序可以單獨(dú)進(jìn)行。因此，在μClinux嵌入系統(tǒng)中采用本文介紹的方法調(diào)試外部設(shè)備，具有快速方便的特點(diǎn)，大大加快了在μClinux應(yīng)用系統(tǒng)中的設(shè)備調(diào)式，節(jié)約了時間。

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