A “short list” of embedded systems .pptVIP

Chapter 8: State Machine and Concurrent Process Model Outline Models vs. Languages State Machine Model FSM/FSMD HCFSM and Statecharts Language Program-State Machine PSM Model Concurrent Process Model Communication Synchronization Implementation Dataflow Model Real-Time Systems Introduction Describing embedded system’s processing behavior Can be extremely difficult Complexity increasing with increasing IC capacity Past: washing machines, small games, etc. Hundreds of lines of code Today: TV set-top boxes, Cell phone, etc. Hundreds of thousands of lines of code Desired behavior often not fully understood in beginning Many implementation bugs due to description mistakes/omissions English or other natural language common starting point Precise description difficult to impossible Example: Motor Vehicle Code – thousands of pages long... An example of trying to be precise in English California Vehicle Code Right-of-way of crosswalks 21950. a The driver of a vehicle shall yield the right-of-way to a pedestrian crossing the roadway within any marked crosswalk or within any unmarked crosswalk at an intersection, except as otherwise provided in this chapter. b The provisions of this section shall not relieve a pedestrian from the duty of using due care for his or her safety. No pedestrian shall suddenly leave a curb or other place of safety and walk or run into the path of a vehicle which is so close as to constitute an immediate hazard. No pedestrian shall unnecessarily stop or delay traffic while in a marked or unmarked crosswalk. c The provisions of subdivision b shall not relieve a driver of a vehicle from the duty of exercising due care for the safety of any pedestrian within any marked crosswalk or within any unmarked crosswalk at an intersection. All that just for crossing the street and there’s much more ! Models and languages How can we precisely capture behavior? We may think of languages C, C++ , but computation model is the key Common computation