LibXR::STM32Timebase Class Reference

STM32 SysTick 时间基准实现 / STM32 SysTick-based timebase implementation. 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 ()
	获取当前微秒计数 / Get current timestamp in microseconds
MillisecondTimestamp	_get_milliseconds ()
	获取当前毫秒计数 / Get current timestamp 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 void	DelayMicroseconds (uint32_t us)
	微秒级延时 / Delay in microseconds
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

STM32 SysTick 时间基准实现 / STM32 SysTick-based timebase implementation.

Definition at line 11 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

获取当前微秒计数 / Get current timestamp in microseconds

Returns

MicrosecondTimestamp 微秒时间戳 / Microsecond timestamp

Implements LibXR::Timebase.

Definition at line 10 of file stm32_timebase.cpp.

{
  do
  {
    uint32_t tick_old = HAL_GetTick();
    uint32_t cnt_old = SysTick->VAL;
    uint32_t tick_new = HAL_GetTick();
    uint32_t cnt_new = SysTick->VAL;
 
    auto time_diff = tick_new - tick_old;
    uint32_t tick_load = SysTick->LOAD + 1;
    switch (time_diff)
    {
      case 0:
        return MicrosecondTimestamp(static_cast<uint64_t>(tick_new) * 1000 + 1000 -
                                    static_cast<uint64_t>(cnt_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>(tick_new) * 1000 + 1000 -
                                    static_cast<uint64_t>(cnt_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 */
        continue;
    }
  } while (true);
}

_get_milliseconds()

MillisecondTimestamp STM32Timebase::_get_milliseconds ( )

virtual

获取当前毫秒计数 / Get current timestamp in milliseconds

Returns

MillisecondTimestamp 毫秒时间戳 / Millisecond timestamp

Implements LibXR::Timebase.

Definition at line 38 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