rt-thread/documentation/6.components/device-driver/clock_time/figures/clock_time_arch.svg

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  <text class="title" x="170" y="45" text-anchor="middle">POSIX / libc</text>
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  <text class="title" x="730" y="45" text-anchor="middle">Device Drivers</text>
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  <!-- ========== Clock Time 子系统层 ========== -->
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  <text class="layer-title" x="60" y="142">Clock Time Subsystem</text>

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  <text class="title" x="180" y="195" text-anchor="middle">Core API</text>
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  <text class="text" x="180" y="227" text-anchor="middle">counter ↔ ns conversion</text>

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  <text class="text" x="450" y="227" text-anchor="middle">monotonic time base</text>

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  <text class="title" x="720" y="195" text-anchor="middle">Clock Event Device</text>
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  <text class="title" x="180" y="305" text-anchor="middle">Clock HRTimer</text>
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  <text class="title" x="450" y="305" text-anchor="middle">Boottime Helpers</text>
  <text class="text" x="450" y="322" text-anchor="middle">get_us / get_ns / get_s</text>
  <text class="text" x="450" y="337" text-anchor="middle">timeval / timespec</text>

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  <text class="title" x="720" y="305" text-anchor="middle">Clock Timer Adapter</text>
  <text class="text" x="720" y="322" text-anchor="middle">rt_clock_timer device API</text>
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  <text class="title" x="450" y="472" text-anchor="middle">BSP Drivers</text>
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  <text class="title" x="450" y="565" text-anchor="middle">Hardware Counter / Timer</text>
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  <!-- ========== 箭头连接（使用圆弧路径） ========== -->

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