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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
RT-Thread RTC 设备
1、介绍
RT-Thread 的 RTC （实时时钟）设备为操作系统的时间系统提供了基础服务。面对越来越多的 IoT 场景，RTC 已经成为产品的标配，甚至在诸如 SSL 的安全传输过程中，RTC 已经成为不可或缺的部分。
2、使用
应用层对于 RTC 设备一般不存在直接调用的 API ，如果使用到 C 标准库中的时间 API （目前主要是获取当前时间的 time_t time(time_t *t)），则会间接通过设备的 control 接口完成交互。
注意：目前系统内只允许存在一个 RTC 设备，且名称为
"rtc"。
2.1 设置日期
rt_err_t set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day)
| 参数 | 描述 |
|---|---|
| year | 待设置生效的年份 |
| month | 待设置生效的月份 |
| day | 待设置生效的日 |
2.2 设置时间
rt_err_t set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
| 参数 | 描述 |
|---|---|
| hour | 待设置生效的时 |
| minute | 待设置生效的分 |
| second | 待设置生效的秒 |
2.3 使用 Finsh/MSH 命令 查看/设置 日期和时间
2.3.1 查看日期和时间
输入 date 即可，大致效果如下：
msh />date
Fri Feb 16 01:11:56 2018
msh />
2.3.2 设置日期和时间
同样使用 date 命令，在命令后面再依次输入 年 月 日 时 分 秒 （中间空格隔开, 24H 制），大致效果如下：
msh />date 2018 02 16 01 15 30 # 设置当前时间为 2018-02-16 01:15:30
msh />
2.4 启用 Soft RTC （软件模拟 RTC）
这个模式非常适用于对时间精度要求不高，没有硬件 RTC 的产品。
2.4.1 使用方法
在 menuconfig 中启用 RT_USING_SOFT_RTC 配置。