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(1)底層驅(qū)動(dòng)程序總體設(shè)計(jì)。在linux中設(shè)備驅(qū)動(dòng)程序是由一組數(shù)據(jù)結(jié)構(gòu)和函數(shù)組成的，它包含設(shè)備服務(wù)子程序(如open、read、write、close、ioctl等)、初始化函數(shù)can_init()和中斷處理程序can_interrupt()。
在linux加載can驅(qū)動(dòng)時(shí)調(diào)用can_init()，向操作系統(tǒng)注冊(cè)設(shè)備，同時(shí)完成can總線波特率的設(shè)置，id過(guò)濾器的設(shè)置，清空接收和發(fā)送緩沖區(qū)，開(kāi)啟中斷等工作，完成初始化后，退出復(fù)位模式，進(jìn)入正常的工作模式。
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read從接收緩沖區(qū)讀取數(shù)據(jù);write向發(fā)送緩沖區(qū)寫(xiě)人數(shù)據(jù);release關(guān)閉can 控制器;ioctl向can 控制器發(fā)各種操作命令，包括設(shè)置sja1000總線波特率、id過(guò)濾器等;open 打開(kāi)can 控制器，并使用函數(shù)request_irq()向系統(tǒng)申請(qǐng)中斷，并設(shè)置中斷處理程序?yàn)閏an_interrupt()，當(dāng)sja1000內(nèi)部中斷寄存器(ir)的任意位置為1時(shí)，int引腳低電平有效，調(diào)用其中斷處理函數(shù)can-interrupt()，在該函數(shù)中讀取中斷控制寄存器，判斷中斷原因(接收中斷、發(fā)送中斷、錯(cuò)誤中斷、數(shù)據(jù)溢出中斷、喚醒中斷)，從而調(diào)用相應(yīng)的服務(wù)子程序。
(2)sja1000讀寫(xiě)邏輯分析及設(shè)計(jì)。由于sja1000的地址線和數(shù)據(jù)線是分時(shí)復(fù)用的，需要通過(guò)軟件編程模擬地址鎖存信號(hào)，以達(dá)到數(shù)據(jù)和地址的分時(shí)傳輸，因此，在程序設(shè)計(jì)中，要考慮sja1000的讀寫(xiě)時(shí)序。圖4為sja1000的寫(xiě)時(shí)序圖。
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Idec ALW29910D-S-24V Lighted Pushbutton (White)
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