| Вопрос: Как программно организовать задержку в 0,25ms | Добавлено: 06.01.06 10:17 |
Автор вопроса:  Andr
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| Ответы | Всего ответов: 18 |
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Номер ответа: 16 Автор ответа:  Sharp Лидер форума ICQ: 216865379 Вопросов: 106 Ответов: 9979 |
Web-сайт: Профиль | | #16 | Добавлено: 07.01.06 13:28 |
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Хех, пауза там сделана с элегантностью первых советских телевизоров:
DO_DELAY MACRO
; Silly method, but it works 
mov eax, DELAY .while eax dec eax .endw ENDM |
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Номер ответа: 17 Автор ответа:  Andr Вопросов: 3 Ответов: 7 |
Профиль | | #17 | Добавлено: 10.01.06 02:01 |
| SetPriorityClass c REALTIME_PRIORITY_CLASS и SetThreadPriority c THREAD_PRIORITY_TIME_CRITICAL -- было дело. RDTSC - подробней!? если могешь!? | ||
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Номер ответа: 18 Автор ответа: SharpЛидер форума ICQ: 216865379 Вопросов: 106 Ответов: 9979 |
Web-сайт: Профиль | | #18 | Добавлено: 10.01.06 12:22 |
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Интеловский мануал
RDTSC—Read Time-Stamp Counter
Description Loads the current value of the processor’s time-stamp counter into the EDX:EAX registers. The time-stamp counter is contained in a 64-bit MSR. The high-order 32 bits of the MSR are loaded into the EDX register, and the low-order 32 bits are loaded into the EAX register. The processor increments the time-stamp counter MSR every clock cycle and resets it to 0 whenever the processor is reset. When in protected or virtual 8086 mode, the time stamp disable (TSD) flag in register CR4 restricts the use of the RDTSC instruction as follows. When the TSD flag is clear, the RDTSC instruction can be executed at any privilege level; when the flag is set, the instruction can only be executed at privilege level 0. (When in real-address mode, the RDTSC instruction is always enabled.) The time-stamp counter can also be read with the RDMSR instruction, when executing at privilege level 0. The RDTSC instruction is not a serializing instruction. Thus, it does not necessarily wait until all previous instructions have been executed before reading the counter. Similarly, subsequent instructions may begin execution before the read operation is performed. |
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