By Anthony J. Massa
Embedded software program improvement with eCos is the 1st whole consultant to development strategies with this versatile, reasonably cheap, royalty-free embedded software program improvement platform. writer Anthony J. Massa covers eCos structure, deploy, configuration, coding, deployment, and the whole eCos improvement platform, together with aid parts. broad code examples and an entire software case learn display each key programming thought, together with exceptions, interrupts, digital vectors, threads, synchronization, networking, net connectivity, debug/bootstrap, or even porting eCos to new undefined.
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Extra info for Embedded Software Development with eCos
2. subsequent, we'd like the clock frequency. for that reason, we think a clock operating at 100Hz, which corresponds to at least one tick each 10 milliseconds, or 1 tick each 10,000,000 nanoseconds. This corresponds to a numerator of a hundred and a denominator of 1,000,000,000. three. eventually, we will calculate the tick worth we have to use within the name utilizing the equation hold up (in nanoseconds) × Numerator -------------------------------------------------------------------------------------------- = Clock ticks. Denominator accordingly, in our instance we plug within the values and get 60000000 × a hundred --------------------------------------- = 6 . one thousand million four. We then name the clock-related kernel functionality and cross it the parameter 6 for our 60millisecond hold up. yet another factor to recollect, those conversion calculations can occasionally be computation extensive. consequently, it is often a good suggestion in an embedded procedure to accomplish those calculations each time attainable at bring together time instead of at run time. 124 bankruptcy 7 • different eCos structure elements The kernel could be configured to supply a Real-Time Clock (RTC) for the approach. The RTC is critical to aid clock- and alarm-related services similar to cyg_thread_delay. it's also wanted for the multilevel queue scheduler while utilizing timeslicing. merchandise checklist 7. 2 information the kernel clock configuration thoughts. The kernel makes use of the HAL_CLOCK_INITIALIZE macro whilst it initializes the real-time clock. HAL_CLOCK_RESET is utilized in the ISR for the real-time clock. merchandise checklist 7. 2 Kernel Clock Configuration strategies choice identify CDL identify Description supply Real-Time Clock CYGVAR_KERNEL_COUNTERS_CLOCK permits the kernel to supply the real-time clock for clock- and alarm-related services and timeslicing (when utilizing the multilevel queue scheduler). The default environment for this feature is enabled. alternative identify CDL identify Description Override Default Clock Settings CYGPKG_KERNEL_COUNTERS_CLOCK_OVERRIDE permits overriding of the default clock calculations for a selected platform. The default settings try and configure a hundred clock interrupts consistent with moment. The default environment for this selection is disabled. choice identify CDL identify Description degree Real-Time Clock Interrupt Latency CYGVAR_KERNEL_COUNTERS_CLOCK_LATENCY Measures the latency of the real-time clock timer interrupt. this selection calls for the HAL macro HAL_CLOCK_LATENCY to be outlined. The default atmosphere for this feature is disabled. this feature is just for a functionality dimension. choice identify CDL identify Description degree Real-Time Clock DSR Latency CYGVAR_KERNEL_COUNTERS_CLOCK_DSR_LATENCY Measures the DSR latency for the real-time clock timer interrupt. this selection calls for the HAL macro HAL_CLOCK_LATENCY to be outlined. The default atmosphere for this feature is disabled. this selection is simply for a functionality dimension. The kernel comprises default settings for the clock interrupt frequency which are particular to every platform. The default RTC frequency is 100Hz; although, you might want to seek advice the documentation for the categorical platform you're utilizing to make sure this worth.