Книга: Microsoft Windows Embedded CE 6.0 Exam Preparation Kit

Hardware Validation

Hardware Validation

ILTiming tool, OSBench, and Remote Performance Monitor cover most performance monitoring needs. However, some cases may require other methods of gathering system performance information. For example, if you want to obtain exact interrupt latency timings, or if your hardware platform does not provide the required timer support for the ILTiming tool, you must use hardware-based performance measuring methods based on the General Purpose Input/Output (GPIO) interface of the processor and a waveform generator.

By using a waveform generator on a GPIO, it is possible to generate interrupts that are handled through ISRs and ISTs. These ISRs and ISTs then use another GPIO to generate a waveform in response to the received interrupt. The time elapsed between the two waveforms — the input waveform from the generator and the output waveform from the ISR or IST — is the latency time of the interrupt.

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