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-# NUCLEO-L476RG 开发板的 BSP 说明
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-
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-## 简介
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-
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-本文档为 ST 官方 (64)NUCLEO-L476RG 开发板的 BSP (板级支持包) 说明。
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-
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-主要内容如下：
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-
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-- 开发板资源介绍
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-- BSP 快速上手
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-- 进阶使用方法
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-
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-通过阅读快速上手章节开发者可以快速地上手该 BSP，将 RT-Thread 运行在开发板上。在进阶使用指南章节，将会介绍更多高级功能，帮助开发者利用 RT-Thread 驱动更多板载资源。
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-
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-## 开发板介绍
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-
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-对于 NUCLEO-L476RG，内核是 Cortex-M4，绿色的 Nucleo 标志显示了这款芯片是低功耗系列，板载 ST-LINK/V2-1 调试器/编程器，迷你尺寸，mirco USB 接口，可数的外设，Arduino™ nano 兼容的接口。
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-
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-开发板外观如下图所示：
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-
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-该开发板常用 **板载资源** 如下：
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-
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-- MCU：STM32L476RG，主频 80MHz，1024KB FLASH ，128KB RAM（96+32）。
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-- 常用外设
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- - LED：3个，USB communication(LD1 双色),power LED(LD3 红色),user LED(LD2 黄绿色)
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- - 按键：1个，复位按键(B1)。
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-- 常用接口：USB 支持 3 种不同接口：虚拟 COM 端口、大容量存储和调试端口。
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-- 调试接口：板载 ST-LINK/V2-1 调试器。
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-
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-开发板更多详细信息请参考【STMicroelectronics】 [NUCLEO-L476RG](https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-eval-tools/stm32-mcu-eval-tools/stm32-mcu-nucleo/nucleo-l476rg.html)。
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-
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-## 外设支持
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-
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-本 BSP 目前对外设的支持情况如下：
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-
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-| **板载外设** | **支持情况** | **备注** |
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-| :----------------- | :----------: | :------------------------------------- |
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-| 板载 ST-LINK 转串口 | 支持 | UART2 |
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-| **片上外设** | **支持情况** | **备注** |
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-| GPIO | 支持 | |
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-| UART | 支持 | UART2 |
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-| IIC | 支持 | 软件模拟 |
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-| RTC | 支持 | 支持外部晶振和内部低速时钟 |
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-| SPI | 支持 | SPI1/2/3 |
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-| ADC | 支持 | ADC1_IN1/ADC2_IN2/ADC3_IN3 |
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-| TIME | 支持 | TIME15/16/17 |
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-| **扩展模块** | **支持情况** | **备注** |
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-
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-## 使用说明
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-
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-使用说明分为如下两个章节：
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-
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-- 快速上手
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-
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- 本章节是为刚接触 RT-Thread 的新手准备的使用说明，遵循简单的步骤即可将 RT-Thread 操作系统运行在该开发板上，看到实验效果 。
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-
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-- 进阶使用
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-
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- 本章节是为需要在 RT-Thread 操作系统上使用更多开发板资源的开发者准备的。通过使用 ENV 工具对 BSP 进行配置，可以开启更多板载资源，实现更多高级功能。
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-
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-
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-### 快速上手
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-
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-本 BSP 为开发者提供 MDK5 和 IAR 工程，并且支持 GCC 开发环境。下面以 MDK5 开发环境为例，介绍如何将系统运行起来。
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-
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-#### 硬件连接
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-
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-使用数据线连接开发板到 PC，打开电源开关。
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-
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-#### 编译下载
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-
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-双击 project.uvprojx 文件，打开 MDK5 工程，编译并下载程序到开发板。
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-
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-> 工程默认配置使用 ST-LINK 仿真器下载程序，在通过 microUSB 连接开发板的基础上，点击下载按钮即可下载程序到开发板
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-
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-#### 运行结果
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-
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-下载程序成功之后，系统会自动运行，观察开发板上 LED 的运行效果，红色 LD1 和 LD3 常亮、黄绿色 LD2 会周期性闪烁。
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-
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-USB 虚拟 COM 端口默认连接串口 2，在终端工具里打开相应的串口（115200-8-1-N），复位设备后，可以看到 RT-Thread 的输出信息:
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-
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-```bash
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- \ | /
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-- RT - Thread Operating System
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- / | \ 4.0.0 build Jan 9 2019
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- 2006 - 2018 Copyright by rt-thread team
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-msh >
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-```
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-### 进阶使用
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-
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-此 BSP 默认只开启了 GPIO 和 串口2 的功能，如果需使用更多高级功能，需要利用 ENV 工具对 BSP 进行配置，步骤如下：
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-
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-1. 在 bsp 下打开 env 工具。
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-
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-2. 输入`menuconfig`命令配置工程，配置好之后保存退出。
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-
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-3. 输入`pkgs --update`命令更新软件包。
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-
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-4. 输入`scons --target=mdk4/mdk5/iar` 命令重新生成工程。
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-
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-本章节更多详细的介绍请参考 [STM32 系列 BSP 外设驱动使用教程](../docs/STM32系列BSP外设驱动使用教程.md)。
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-
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-## 注意事项
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-
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-- 开机时如果不能打印 RT-Thread 版本信息，请重新选择 PC 端串口调试软件的串口号或将 BSP 中串口的 GPIO 速率调低
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-
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-## 联系人信息
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-
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-维护人:
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-
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-- [GW] 邮箱：<gycgwzw@gmail.com>
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+# STM32L476-Nucleo BSP Introduction
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+
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+[中文](README_zh.md)
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+
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+## MCU: STM32L476RG @80MHz, 1024KB FLASH, 128KB RAM
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+
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+The STM32L476xx devices are the ultra-low-power microcontrollers based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 80 MHz. The Cortex-M4 core features a Floating point unit (FPU) single precision which supports all Arm® single-precision data-processing instructions and data types. It also implements a full set of DSP instructions and a memory protection unit (MPU) which enhances application security.
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+
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+The STM32L476xx devices embed high-speed memories (Flash memory up to 1 Mbyte, up to 128 Kbyte of SRAM), a flexible external memory controller (FSMC) for static memories (for devices with packages of 100 pins and more), a Quad SPI flash memories interface (available on all packages) and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.
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+The STM32L476xx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and Firewall.
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+The devices offer up to three fast 12-bit ADCs (5 Msps), two comparators, two operational amplifiers, two DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timer, two 16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power timers. The devices support four digital filters for external sigma delta modulators (DFSDM).
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+In addition, up to 24 capacitive sensing channels are available. The devices also embed an integrated LCD driver 8x40 or 4x44, with internal step-up converter.
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+They also feature standard and advanced communication interfaces.
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+The STM32L476xx operates in the -40 to +85 °C (+105 °C junction), -40 to +105 °C (+125 °C junction) and -40 to +125 °C (+130 °C junction) temperature ranges from a 1.71 to 3.6 V VDD power supply when using internal LDO regulator and a 1.05 to 1.32V VDD12 power supply when using external SMPS supply. A comprehensive set of power-saving modes allows the design of low-power applications.
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+Some independent power supplies are supported: analog independent supply input for ADC, DAC, OPAMPs and comparators, 3.3 V dedicated supply input for USB and up to 14 I/Os can be supplied independently down to 1.08V. A VBAT input allows to backup the RTC and backup registers. Dedicated VDD12 power supplies can be used to bypass the internal LDO regulator when connected to an external SMPS.
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+The STM32L476xx family offers six packages from 64-pin to 144-pin packages.
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+
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+#### KEY FEATURES
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+
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+- Ultra-low-power with FlexPowerControl
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+ - 1.71 V to 3.6 V power supply
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+ - -40 °C to 85/105/125 °C temperature range
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+ - 300 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
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+ - 30 nA Shutdown mode (5 wakeup pins)
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+ - 120 nA Standby mode (5 wakeup pins)
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+ - 420 nA Standby mode with RTC
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+ - 1.1 μA Stop 2 mode, 1.4 μA with RTC
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+ - 100 μA/MHz run mode (LDO Mode)
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+ - 39 μA/MHz run mode (@3.3 V SMPS Mode)
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+ - Batch acquisition mode (BAM)
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+ - 4 μs wakeup from Stop mode
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+ - Brown out reset (BOR)
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+ - Interconnect matrix
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+- Core: Arm® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator™) allowing 0-wait-state execution from Flash memory, frequency up to 80 MHz, MPU, 100DMIPS and DSP instructions
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+- Performance benchmark
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+ - 1.25 DMIPS/MHz (Drystone 2.1)
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+ - 273.55 CoreMark® (3.42 CoreMark/MHz @ 80 MHz)
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+- Energy benchmark
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+ - 294 ULPMark™ CP score
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+ - 106 ULPMark™ PP score
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+- Clock Sources
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+ - 4 to 48 MHz crystal oscillator
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+ - 32 kHz crystal oscillator for RTC (LSE)
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+ - Internal 16 MHz factory-trimmed RC (±1%)
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+ - Internal low-power 32 kHz RC (±5%)
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+ - Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
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+ - 3 PLLs for system clock, USB, audio, ADC
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+- Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
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+- RTC with HW calendar, alarms and calibration
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+- LCD 8× 40 or 4× 44 with step-up converter
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+- Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
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+- 16x timers: 2x 16-bit advanced motor-control, 2x 32-bit and 5x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
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+
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+- Memories
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+ - Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
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+ - Up to 128 KB of SRAM including 32 KB with hardware parity check
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+ - External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
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+ - Quad SPI memory interface
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+- 4x digital filters for sigma delta modulator
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+- Rich analog peripherals (independent supply)
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+ - 3x 12-bit ADC 5 Msps, up to 16-bit with hardware oversampling, 200 μA/Msps
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+ - 2x 12-bit DAC output channels, low-power sample and hold
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+ - 2x operational amplifiers with built-in PGA
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+ - 2x ultra-low-power comparators
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+- 20x communication interfaces
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+ - USB OTG 2.0 full-speed, LPM and BCD
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+ - 2x SAIs (serial audio interface)
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+ - 3x I2C FM+(1 Mbit/s), SMBus/PMBus
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+ - 5x USARTs (ISO 7816, LIN, IrDA, modem)
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+ - 1x LPUART (Stop 2 wake-up)
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+ - 3x SPIs (and 1x Quad SPI)
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+ - CAN (2.0B Active) and SDMMC interface
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+ - SWPMI single wire protocol master I/F
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+ - IRTIM (Infrared interface)
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+- 14-channel DMA controller
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+- True random number generator
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+- CRC calculation unit, 96-bit unique ID
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+- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
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+- All packages are ECOPACK2® compliant
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+
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+
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+
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+## Read more
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+
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+| Documents | Description |
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+| :----------------------------------------------------------: | :----------------------------------------------------------: |
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+| [STM32_Nucleo-64_BSP_Introduction](../docs/STM32_Nucleo-64_BSP_Introduction.md) | How to run RT-Thread on STM32 Nucleo-64 boards (**Must-Read**) |
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+| [STM32L476RG ST Official Website](https://www.st.com/en/microcontrollers-microprocessors/stm32l476rg.html#documentation) | STM32L476RG datasheet and other resources |
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+
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+
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+
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+## Maintained By
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+
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+<gycgwzw@gmail.com>
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+
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+
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+
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+## Translated By
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+
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+Meco Man @ RT-Thread Community
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+
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+> jiantingman@foxmail.com
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+>
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+> https://github.com/mysterywolf
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mysterywolf