mirror of https://github.com/rusefi/rusefi-1.git
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
/**
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* @file efilib2.cpp
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*
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* @date Apr 14, 2014
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* @author Andrey Belomutskiy, (c) 2012-2013
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*/
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#include "efilib2.h"
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/**
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* The main use-case of this class is to keep track of a 64-bit global number of CPU ticks from reset.
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*
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* stm32f4 hardware has a 32-bit Cycle Count Register (CYCCNT), which is incremented with every CPU cycle.
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* With 32 bits and 168MHz speed this counter overflows every 4B/168M = 23 seconds. The job of this class is to
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* keep track of the current CYCCNT value, detect these overflows, and provide a nice,
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* clean 64 bit global cycle counter.
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*
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* In order for this to function, it's your responsibility to invoke offer() method at least once a second.
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*/
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Overflow64Counter::Overflow64Counter() {
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currentBase = 0;
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currentValue = 0;
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}
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void Overflow64Counter::offer(uint32_t value) {
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if (value < currentValue) {
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// new value less than previous value means there was an overflow in that 32 bit counter
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currentBase += 0x100000000LL;
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}
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currentValue = value;
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}
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uint64_t Overflow64Counter::get(void) {
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return currentBase + currentValue;
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}
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