LibXR::STM32Timebase Class Reference

获取基于STM32 SysTick计数器的时间基准（微秒与毫秒） / Provides a timebase using STM32 SysTick timer (microseconds and milliseconds) More...

#include <stm32_timebase.hpp>

Inheritance diagram for LibXR::STM32Timebase:

Collaboration diagram for LibXR::STM32Timebase:

Public Member Functions
	STM32Timebase ()
	默认构造函数 / Default constructor
MicrosecondTimestamp	_get_microseconds ()
	获取当前时间（微秒级） / Get current time in microseconds
MillisecondTimestamp	_get_milliseconds ()
	获取当前时间（毫秒级） / Get current time in milliseconds
Public Member Functions inherited from LibXR::Timebase
	Timebase (uint64_t max_valid_us=UINT64_MAX, uint32_t max_valid_ms=UINT32_MAX)
	默认构造函数，初始化全局时间基指针。 Default constructor, initializing the global timebase pointer.

Additional Inherited Members
Static Public Member Functions inherited from LibXR::Timebase
static MicrosecondTimestamp	GetMicroseconds ()
	获取当前时间的微秒级时间戳。 Gets the current timestamp in microseconds.
static MillisecondTimestamp	GetMilliseconds ()
	获取当前时间的毫秒级时间戳。 Gets the current timestamp in milliseconds.
Static Public Attributes inherited from LibXR::Timebase
static Timebase *	timebase = nullptr
	静态指针，用于存储全局时间基对象。 Static pointer storing the global timebase instance.

Detailed Description

获取基于STM32 SysTick计数器的时间基准（微秒与毫秒） / Provides a timebase using STM32 SysTick timer (microseconds and milliseconds)

Definition at line 13 of file stm32_timebase.hpp.

Constructor & Destructor Documentation

STM32Timebase()

STM32Timebase::STM32Timebase

(

)

默认构造函数 / Default constructor

Definition at line 5 of file stm32_timebase.cpp.

    : Timebase(static_cast<uint64_t>(UINT32_MAX) * 1000 + 999, UINT32_MAX)
{
}

Member Function Documentation

_get_microseconds()

MicrosecondTimestamp STM32Timebase::_get_microseconds ( )

virtual

获取当前时间（微秒级） / Get current time in microseconds

该函数通过读取SysTick计数器的值和系统滴答定时器的毫秒数，计算当前的微秒时间。 It calculates current microsecond timestamp based on SysTick counter and system tick value.

Returns

MicrosecondTimestamp 当前时间（微秒） / Current timestamp in microseconds

Implements LibXR::Timebase.

Definition at line 10 of file stm32_timebase.cpp.

{
  uint32_t ms_old = HAL_GetTick();
  uint32_t tick_value_old = SysTick->VAL;
  uint32_t ms_new = HAL_GetTick();
  uint32_t tick_value_new = SysTick->VAL;
 
  auto time_diff = ms_new - ms_old;
  uint32_t tick_load = SysTick->LOAD + 1;
  switch (time_diff)
  {
    case 0:
      return MicrosecondTimestamp(static_cast<uint64_t>(ms_new) * 1000 + 1000 -
                                  static_cast<uint64_t>(tick_value_old) * 1000 /
                                      tick_load);
    case 1:
      /* 中断发生在两次读取之间 / Interrupt happened between two reads */
      return MicrosecondTimestamp(static_cast<uint64_t>(ms_new) * 1000 + 1000 -
                                  static_cast<uint64_t>(tick_value_new) * 1000 /
                                      tick_load);
    default:
      /* 中断耗时过长（超过1ms），程序异常 / Indicates that interrupt took more than
       * 1ms, an error case */
      ASSERT(false);
  }
 
  return 0;
}

_get_milliseconds()

MillisecondTimestamp STM32Timebase::_get_milliseconds ( )

virtual

获取当前时间（毫秒级） / Get current time in milliseconds

Returns

MillisecondTimestamp 当前时间（毫秒） / Current timestamp in milliseconds

Implements LibXR::Timebase.

Definition at line 39 of file stm32_timebase.cpp.

{ return HAL_GetTick(); }

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The documentation for this class was generated from the following files:

• driver/st/stm32_timebase.hpp
• driver/st/stm32_timebase.cpp