6DD1681-0AF4

6DD1681-0AF4

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6DD1681-0AF4

  PIC18F258是美國(guó)Microchip公司生產(chǎn)的內(nèi)部嵌有CAN總線控制器的高性能PIC系列單片機(jī)，由于其超小型、低功耗、低成本、多品種的特點(diǎn)，其應(yīng)用范圍十分廣泛。PIC18F258是集成了CAN模塊的微控制器,有著*的精簡(jiǎn)指令集構(gòu)架、增強(qiáng)型內(nèi)核、32級(jí)堆棧，片內(nèi)具有Flash程序存儲(chǔ)器、EEROM數(shù)據(jù)存儲(chǔ)器、自編程功能、在線調(diào)試器（ICD）和多種內(nèi)部、外部中斷源，并采用了程序和數(shù)據(jù)空間*分開的“哈佛”結(jié)構(gòu)。這種結(jié)構(gòu)大大降低了PIC微控制器的總體成本，同時(shí)提高了運(yùn)行效率。在電路中，PIC18F258單片機(jī)是CAN總線接口電路的核心，主要完成CAN總線上數(shù)據(jù)的發(fā)送和接收，實(shí)現(xiàn)串行數(shù)據(jù)的分解及組合，保證通信的正常暢通。
PCA82C250是Philips公司的CAN總線接口芯片，是CAN控制器與物理總線之間的接口，提供對(duì)總線的差分發(fā)送和接收的功能,它與ISO11898標(biāo)準(zhǔn)*兼容，有三種不同的工作方式,即高速、斜率控制和待機(jī)，可以根據(jù)實(shí)際情況加以選擇，在本方案中選擇高速工作方式。該芯片引腳少，使用簡(jiǎn)單。CAN總線采用PCA82C250芯片作為與總線之間的接口，PCA82C250的CANH、CANL引腳各自通過(guò)一個(gè)電阻與CAN總線相連，電阻可以起到一定的限流作用，保護(hù)PCA82C250免受過(guò)流的沖擊。另外，CANH和CANL與地之間并聯(lián)兩個(gè)小電容，可以濾除總線上的高頻干擾和防電磁輻射。光電耦合器采用General Instrument公司生產(chǎn)的高速邏輯門輸出光電耦合器6N137，它的zui大傳輸延遲時(shí)間是75 ns，典型值是46 ns，采用6N137高速光電耦合電路可以很好地實(shí)現(xiàn)總線上節(jié)點(diǎn)之間的電氣隔離,同時(shí)可提高系統(tǒng)的抗*力和傳輸信號(hào)的能力。使用時(shí)，光電耦合器的兩個(gè)電源VCC和V′CC必須采用電源隔離電路進(jìn)行*隔離。
4 CAN通信系統(tǒng)軟件設(shè)計(jì)流程
　　軟件設(shè)計(jì)是系統(tǒng)設(shè)計(jì)的關(guān)鍵。使用開發(fā)軟件MPLAB IDE、仿真器ICD 2，以及靈活簡(jiǎn)便的C語(yǔ)言。為了提高可靠性和可理解性[4]，內(nèi)部軟件設(shè)計(jì)采用了模塊結(jié)構(gòu)，主要包括主程序、系統(tǒng)初始化子程序、數(shù)據(jù)發(fā)送子程序、數(shù)據(jù)接收子程序和電機(jī)控制子程序。此外，還應(yīng)有中斷服務(wù)子程序、A/D采樣子程序、故障診斷子程序和終端子程序等。這里主要對(duì)系統(tǒng)初始化子程序和電機(jī)控制子程序進(jìn)行探討。
　　系統(tǒng)初始化子程序是系統(tǒng)設(shè)計(jì)工作中極為重要的部分，它是CAN總線系統(tǒng)正常工作的前提，關(guān)系到整個(gè)CAN系統(tǒng)能否正常工作。因此，初始化設(shè)計(jì)是一個(gè)重點(diǎn)，主要包括CAN模塊工作方式的配置、接收濾波器的設(shè)置、接收屏蔽寄存器設(shè)置、波特率參數(shù)設(shè)置、發(fā)送優(yōu)先級(jí)設(shè)置和中斷允許寄存器設(shè)置等。初始化子程序流程如圖4所示

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