IC695STK001
IC695STK001
那么針對于這樣的問題,或者是遇到類似的項目我們應(yīng)該如何處理呢?
我提幾條建議:
1、將硬件系統(tǒng)區(qū)分為獨立單元單獨做成底層驅(qū)動函數(shù)和應(yīng)用函數(shù),并且函數(shù)正常應(yīng)該有參數(shù)和返回值,其中返回值是必要的。如何衡量這類函數(shù)呢?這類函數(shù)可移植性強,只要一個.件和一個.c文件就可以隨意放到任何工程中。例如:語音播放、M1讀卡、485處理等等。
2、將1中的所有函數(shù)進行時間評估,評估點有兩個。一個是函數(shù)的執(zhí)行時間t,是函數(shù)的周期性發(fā)生的時間T,一個最基本的條件是t《T,理想情況應(yīng)該是t《《T。
3、建立一個集中邏輯處理函數(shù),在這個函數(shù)中對1中的各個函數(shù)進行調(diào)度。這個函數(shù)發(fā)揮的作用相當于嵌入式系統(tǒng)中的系統(tǒng)調(diào)度。這種調(diào)度是整個硬件邏輯中所有事件處理的調(diào)度,它的目的是完成一個處理過程,但是絕不依賴于任意事件的必要處理過程。這樣就將問題2中提到的事件間的邏輯關(guān)系弱化了,處理起來變得十分靈活,使得各個關(guān)系不在相互必要。
4、為了保證前面內(nèi)容的正常實施還需要針對各類事件的周期,建立一個必要的時間管理函數(shù),時間函數(shù)的基礎(chǔ)一般情況下由一個內(nèi)部定時器的中斷來完成,中斷的周期一般我們考慮5-10ms。按照實際需求將N個定時器中斷定義為一個事件處理的周期TT,這個周期應(yīng)該保證處理完最惡劣情況可能發(fā)生的所有t,且保證TT《T。
5、這其中也有例外,一些實時性要求高的事件應(yīng)當用中斷完成。其中中斷處理函數(shù)的處理事件應(yīng)盡量短,時間要求參見2。
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