Download E-books Embedded Software Development with eCos PDF

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By Anthony J. Massa

Embedded software program improvement with eCos is the 1st whole advisor to development suggestions with this versatile, inexpensive, royalty-free embedded software program improvement platform. writer Anthony J. Massa covers eCos structure, install, configuration, coding, deployment, and the full eCos improvement platform, together with help parts. broad code examples and a whole program case learn display each key programming inspiration, together with exceptions, interrupts, digital vectors, threads, synchronization, networking, net connectivity, debug/bootstrap, or even porting eCos to new undefined.

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Code directory 7. 2 is an instance of ways to exploit an alarm with the procedure real-time clock. within the cyg_user_start functionality, proven on-line 15, a deal with to the real-time clock is kept in sys_clk utilizing the functionality cyg_real_time_clock, as proven on-line 17. subsequent, we get entry to the real-time clock’s hooked up counter, online 19. The deal with is kept within the variable counter_hdl, as we see on-line 20. on-line 22, we use the deal with to the procedure real-time clock to create an alarm. while the alarm triggers, the functionality handed in online 23, alarm_handler, is named and the functionality is handed the variable index, proven online 24. The alarm deal with is back within the parameter handed in online 25, alarm_hdl. The alarm item is kept within the parameter handed online 26, alarm_obj. ultimately, we initialize the alarm online 28 utilizing the alarm deal with we simply created. within the cyg_alarm_initialize functionality name, we set the preliminary set off of the alarm on-line 29. thus, we use the cyg_current_time functionality name, which returns the present real-time clock counter price, and upload a hundred to the tick worth. This factors the alarm to set off in a hundred ticks from the present time. The parameter online 30 determines the period to set off the alarm after the preliminary set off. accordingly, the alarm_handler functionality is named each a hundred real-time clock ticks. The alarm_handler functionality is proven on strains 36 via forty-one, which easily increments the information parameter handed into the functionality and in flip increments the index variable setup whilst the alarm used to be created online 24. 7. 1. four Timers A timer is an alarm that's connected to a clock. there's a timer item outlined via the kernel. even though, eCos doesn't supply a proper implementation, or kernel API services, for the timer item. Timers within the eCos approach are used in the µITRON compatibility layer package deal. The µITRON package deal makes use of the timer item connected to the real-time clock for appearing its wanted timing similar services. 134 7. 2 bankruptcy 7 • different eCos structure parts Asserts and Tracing eCos helps mechanisms to assist in debugging—asserts and tracing. An assert is a section of code that exams, at run time, no matter if a situation is anticipated. If the situation isn't anticipated, an mistakes message should be output and the appliance is halted. Assertions can ascertain if there's a trojan horse within the code and isolate the matter instantly, instead of having the applying fail later in the course of execution. Tracing permits the output of textual content messages at numerous issues within the application’s execution. This output permits you to persist with the execution stream of a application or cost a specific prestige while definite occasions happen. The eCos assert aid is complementary to the ISO C normal assert performance inside the Assertions Implementation Header (CYGBLD_ISO_ASSERT_HEADER) configuration choice below the ISO C and POSIX Infrastructure package deal. either asserts and lines are outlined as macros. the 1st parameter to the macro is a Boolean that determines no matter if the message is output.

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