Unlike UDP, TCP software handlers need to maintain a number of local variables and countdown timers during initialisation, and for the duration of the connection. Read moreĪ connection must be established ( Figure 7-16 ) before either end can talk to each other. Anything to do with interrupt vectors and interrupt control is necessarily very processor-specific. The method chosen has the advantage of brevity and simplicity. For example, using an array of pointers to functions, which is located at link time. There are several other methods by which this may be achieved. The function is necessarily declared to be of type void, with no parameters.Īlso shown is the definition of the interrupt vector, using an assembly language insert. This ensures that context-saving code is generated and the function ends with an RTE instead of RTS. Note that the function is declared as an ISR by using the keyword interrupt, which is a common extension to ANSI C. On many systems, it is required to continue to push on the panic bar during the countdown period.įlash_bits=lights > 8 /* update lights */ On some systems, an audible countdown announcement accompanies the numeric indicator on the magnetic lock. The alarm is continuous during the countdown. Typically, a numeric indicator on the magnetic lock shows the time remaining.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |