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* [components][clock_time] Refactor time subsystem around clock_time Introduce the clock_time core with clock source/event separation, high-resolution scheduling, and boot-time helpers, plus clock_timer adapters for timer peripherals. Remove legacy ktime/cputime/hwtimer implementations and migrate arch and BSP time paths to the new subsystem while keeping POSIX time integration functional. Update drivers, Kconfig/SConscript wiring, documentation, and tests; add clock_time overview docs and align naming to clock_boottime/clock_hrtimer/clock_timer. * [components][clock_time] Use BSP-provided clock timer frequency on riscv64 * [risc-v] Use runtime clock timer frequency for tick and delays * [bsp] Add clock timer frequency hooks for riscv64 boards * [bsp] Update Renesas RA driver doc clock_timer link * [bsp] Sync zynqmp-r5-axu4ev rtconfig after config refresh * [bsp][rk3500] Update rk3500 clock configuration * [bsp][hpmicro] Add rt_hw_us_delay hook and update board delays * [bsp][stm32l496-st-nucleo] enable clock_time for hwtimer sample in ci * [bsp][hpmicro] Fix rtconfig include scope for hpm6750evk Move rtconfig.h include outside the ENET_MULTIPLE_PORT guard for hpm6750evk and hpm6750evk2 so configuration macros are available regardless of ENET settings. * [bsp][raspi3] select clock time for systimer * [bsp][hpm5300evk] Trim trailing blank line * [bsp][hpm5301evklite] Trim trailing blank line * [bsp][hpm5e00evk] Trim trailing blank line * [bsp][hpm6200evk] Trim trailing blank line * [bsp][hpm6300evk] Trim trailing blank line * [bsp][hpm6750evk] Trim trailing blank line * [bsp][hpm6750evk2] Trim trailing blank line * [bsp][hpm6750evkmini] Trim trailing blank line * [bsp][hpm6800evk] Trim trailing blank line * [bsp][hpm6e00evk] Trim trailing blank line * [bsp][nxp] switch lpc178x to gcc and remove mcx timer source * [bsp][stm32] fix the CONFIG_RT_USING_CLOCK_TIME issue. * [docs][clock_time] add clock time documentation * [docs][clock_time] Update clock time subsystem documentation - Update device driver index to use correct page reference - Clarify upper layer responsibilities in architecture overview - Update README to describe POSIX/libc, Soft RTC, and device driver usage - Refine architecture diagram with improved layout and color scheme - Remove obsolete clock_timer.md file * [kernel][utest] Trim trailing space * [clock_time] Fix hrtimer wrap handling * [clock_time] fix the static rt_inline issue * [clock_time] fix the rt_clock_hrtimer_control result issue
1.4 KiB
1.4 KiB
Clock Time 子系统
clock_time 子系统为 RT-Thread 提供统一的时间基准与事件调度能力。它将 “计时”(单调计数器)与“定时事件”(可编程定时器中断)解耦，允许不同硬件 组合，同时保证内核行为一致。
设计原则
- 单调时间: 时间读数不回退。
- 角色分离: 时钟源负责计数，时钟事件负责触发超时。
- 缩放整数换算: 通过分辨率缩放因子把计数转换为纳秒，避免浮点计算。
- 可降级运行: 缺少硬件事件时由软件定时器维持基本功能。
组成部分
- 时钟源: 提供稳定计数器与频率信息。
- 时钟事件: 可编程下一次超时。
- 时钟定时器适配层: 将通用定时器外设包装为时钟源或事件设备。
- 高精度定时器: 软件调度层，排序超时并驱动下一次事件。
- 启动时间辅助: 将单调计数转换为常见时间格式，供上层使用。
时间流转
- 读取路径: 计数 -> 缩放分辨率 -> 纳秒。
- 超时路径: hrtimer 队列 -> 下一到期 -> 设置事件 -> 中断 -> 回调分发。
BSP 集成要点
- 提供稳定计数器或可编程定时器，一个设备可兼任两种角色。
- 选择默认的时钟源与事件设备，以获得准确计时与高效调度。
- 中断服务保持简短，换算与调度交由核心完成。
- POSIX 时间接口建立在该子系统之上，复用其单调时间基准。