61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
// file rusefi_time_types.h
|
|
|
|
#pragma once
|
|
|
|
#include <cstdint>
|
|
#include <sys/types.h>
|
|
|
|
/**
|
|
* We use a signed type here so that subtraction result is a proper negative value.
|
|
* A typical use-case negative result is when we do 'timeNow() - timeOfEvent' where timeOfEvent
|
|
* is actually after timeNow() due to interrupt context switches
|
|
*
|
|
* See getTimeNowNt()
|
|
* See US2NT
|
|
* See MS2US
|
|
*/
|
|
|
|
/**
|
|
* platform-dependent tick since boot
|
|
* in case of stm32f4 that's 32-bit timer ticks (SCHEDULER_TIMER_DEVICE == TIM5) extended to 64 bits
|
|
*/
|
|
using efitick_t = int64_t;
|
|
|
|
/**
|
|
* 64 bit time in microseconds (1/1_000_000 of a second), since boot
|
|
*/
|
|
using efitimeus_t = int64_t;
|
|
|
|
// time in seconds
|
|
using efitimesec_t = time_t;
|
|
|
|
/**
|
|
* 64-bit counter of microseconds (1/1 000 000 of a second) since MCU reset
|
|
*
|
|
* By using 64 bit, we can achieve a very precise timestamp which does not overflow.
|
|
* The primary implementation counts the number of CPU cycles from MCU reset.
|
|
*
|
|
* WARNING: you should use getTimeNowNt where possible for performance reasons.
|
|
* The heaviest part is '__aeabi_ildivmod' - non-native 64 bit division
|
|
*/
|
|
efitimeus_t getTimeNowUs();
|
|
|
|
/**
|
|
* 64-bit counter CPU/timer cycles since MCU reset
|
|
*
|
|
* See getTimeNowLowerNt for a quicker version which returns only lower 32 bits
|
|
* Lower 32 bits are enough if all we need is to measure relatively short time durations
|
|
* (BTW 2^32 cpu cycles at 168MHz is 25.59 seconds)
|
|
*/
|
|
efitick_t getTimeNowNt();
|
|
|
|
#define MS_PER_SECOND 1000
|
|
#define US_PER_SECOND 1000000
|
|
// note lack of 'f' suffix in constant definition. We rely on consumers to have '-fsingle-precision-constant' gcc option which is not ideal
|
|
// todo: maybe grep .list file to assert lack of double operations? See https://github.com/rusefi/rusefi/commit/5e6d916b31a9dab1ac488b7194728e0d0c68fa26
|
|
#define US_PER_SECOND_F 1000000.0
|
|
#define US_PER_SECOND_LL 1000000LL
|
|
|
|
#define MS2US(MS_TIME) ((MS_TIME) * 1000)
|
|
#define US2MS(US_TIME) ((US_TIME) / 1000)
|