In order to make application development get rid of bottom hardware restriction , and to invoke hardware device through a general interface , device interface is defined in sca system 為了使應用的開發(fā)擺脫底層硬件的制約,使應用能通過一個統(tǒng)一的接口調用硬件設備,在sca系統(tǒng)里定義了設備接口。