diff --git a/source/4-HAL/STM32.md b/source/4-HAL/STM32.md
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-# Embassy STM32 HAL
-
-The [Embassy STM32 HAL](https://github.com/embassy-rs/embassy/tree/master/embassy-stm32) is based on the `stm32-metapac` project.
-
-## The infinite variant problem
-
-STM32 microcontrollers come in many families, and flavors and supporting all of them is a big undertaking. Embassy has taken advantage of the fact that the STM32 peripheral versions are shared across chip families. Instead of re-implementing the SPI peripheral for every STM32 chip family, embassy has a single SPI implementation that depends on code-generated register types that are identical for STM32 families with the same version of a given peripheral.
-
-### The metapac
-
-The `stm32-metapac` module uses pre-generated chip and register definitions for STM32 chip families to generate register types. This is done at compile time based on Cargo feature flags.
-
-The chip and register definitions are located in a separate module, `stm32-data`, which is modified whenever a bug is found in the definitions, or when adding support for new chip families.
-
-### he HAL
-
-The `embassy-stm32` module contains the HAL implementation for all STM32 families. The implementation uses automatically derived feature flags to support the correct version of a given peripheral for a given chip family.
-
-## Timer driver
-
-The STM32 timer driver operates at 32768 Hz by default.
diff --git a/source/4-HAL/STM32.rst b/source/4-HAL/STM32.rst
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+
+Embassy STM32 硬件抽象层
+==========================
+
+.. seealso:: https://embassy.dev/book/dev/stm32.html
+
+`Embassy_STM32_硬件抽象层 <https://github.com/embassy-rs/embassy/tree/master/embassy-stm32>`_ 建立于 ``stm32-metapac`` 基础之上。
+
+芯片系列与版本繁多的问题
+---------------------
+
+STM32 微控制器有很多系列，支持所有系列是一项艰巨的任务。STM32 不同芯片系列的外设版本是相同的，Embassy 充分利用了的这个特征。Embassy 没有为每个 STM32 芯片系列都去实现一个外设接口，对于外设版本相同的 STM32 系列，会被代码生成相同的寄存器类型，Embassy 只针对不同寄存器类型，有一个单独的 SPI 实现。
+
+外设的元信息
+---------------------
+
+``stm32-metapac`` 模块生成寄存器类型时，使用了 STM32 芯片系列预先生成的芯片和寄存器定义。这是在编译时根据 Cargo 功能标志完成的。
+
+芯片和寄存器定义位于单独的 ``stm32-data`` 模块中，每当定义中发现错误，或添加对新芯片系列的支持时，就会对其进行修改。
+
+硬件抽象层（HAL）
+---------------------
+``embassy-stm32`` 模块包含了 STM32 全系列的硬件层抽象实现。对于给定芯片系列和外设版本，该实现使用自动派生出的特性标记，来支持相对应的版本。
+
+定时器的驱动程序
+---------------------
+
+STM32 定时器驱动程序默认工作频率为 32768 Hz。