為某車型設計了一款車身中央控制器BCM，實現了門鎖控制、燈光控制、雨刷控制、車窗控制、LIN通信、RKE通信等功能。BCM采用Freescale的S12系列16位微處理器MC9S12XS128進行設計，通過多路開關檢測芯片MC33993進行IO擴展，解決了多路開關、處理器IO管腳有限條件下的開關信號采集，開關信號檢測程序設計中采用通用結構體統一了各路開關信號的狀態監測及變化捕捉功能的實現，提高了代碼效率及運行的穩定性。同時還敘述了BCM的硬件結構，根據BCM的工作方式設計了軟件流程。

Abstract:

?A body central controller BCM was designed， which realized the door lock control， lighting control， wiper control， window control， LIN communication， RKE communications and other functions. BCM used Freescale’s S12 16’bit microprocessor MC9S12XS128 for its design， and used multiple switch detection chip MC33993 for IO expansion to solve switch detect in multi switch and limited IO pins condition. In switch detect programming， a common structure was adopted to implement switch signals status monitoring and its change capture， which improved the code efficiency and operational stability. Also BCM hardware architecture was described， and software process based on BCM’s work mode was designed

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