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◆數據寄存器2=車速信號低8位;
◆數據寄存器3=發動機轉速信號高8位;
◆數據寄存器4=發動機轉速信號低8位;
◆數據寄存器5=點火開關位置,其中,0表示鑰匙拔出;1表示鑰匙位于OFF;2表示鑰匙位于ACC;3表示鑰匙位于RUN;4表示鑰匙位于START;
◆數據寄存器6=檔位信號,0表示空檔;1表示驅動檔;2表示驅動檔;3表示倒檔;4表示駐車檔;
◆數據寄存器7=遙控信號,0表示遙控解鎖主駕車門;1表示遙控鎖定主駕車門;2表示遙控解鎖所有車門;3表示遙控鎖定所有車門;4表示遙控解鎖行禮箱;
◆數據寄存器8用于防盜模式;0表示進入防盜模式,1表示解除防盜模式;
◆數據寄存器9-16:保留。
軟件流程
各控制器應按規定格式和周期發送數據到總線上,同時也要接受其他控制器的信息。總線上的其他控制器則根據需要各取所需的報文。對于接收數據,本系統采用中斷方式實現。一旦中斷發生,即將接收的數據自動裝載到相應的報文寄存器中,此時還可采用屏蔽濾波方式,利用屏蔽濾波寄存器對接收報文的標識符和預先在接收緩沖器初始化時設定的標識符進行有選擇地逐位比較,只有標識符匹配的報文才能進入接收緩沖器,那些不符合要求的報文則將被屏蔽于接收緩沖器之外,從而減輕CPU處理報文的負擔。此外,不同數據應放入不同的報文寄存器中,因此在接收中斷服務程序中,就可以容易地判斷出中斷是由哪個接收報文引起的,其程序流程圖如圖3所示。
CAN總線作為一種可靠的汽車計算器網絡總線,現已開始在先進的汽車上得到應用,從而使得各汽車計算機控制單元能夠通過CAN總線共享所有的信息和資源,以達到簡化布線、減少傳感器數量、避免控制功能重復、提高系統可靠性和可維護性、降低成本、更好地匹配和協調各個控制系統之目的,進而使得汽車的動力性、操作穩定性、完全性都上升到新的高度、隨著汽車電子技術的發展,具有高度靈活性、簡單的擴展性、優良的抗干擾性和糾錯能力的CAN總線通信協議必將在汽車電容系統中得到更廣泛的應用。
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