Transcription of AN235, Implementing a LIN Master Node Driver …
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AN235, Implementing a LIN Master Node Driver …
2002 Microchip Technology 1AN235 INTRODUCTIONLike most network protocols, the Local InterconnectNetwork (LIN) as described in the official specificationis a multi-layered system. The levels vary from thephysical interface up to the high level application, withlogical data connections between nodes at various lay-ers. This application note focuses on the implementa-tion of an interface between the physical interface andhigher level application firmware, essentially a hard-ware Driver (the shaded blocks in Figure 1). Specifi-cally, this document presents a Master node Driver thatis designed for PIC18 microcontrollers with a standardUSART module. FIGURE 1:BASIC LIN SYSTEM This application note provides a high level view of howthe LIN Driver is implemented, as well as examples ofthe actual code.
2002 Microchip Technology Inc. DS00235A-page 5 AN235 IMPLEMENTING THE DRIVER The core of the firmware is written in an assembly mod-ule to provide good execution performance and use
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