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ARM Cortex-M处理器系列具有灵活性、易用性、高性能、低功耗等特点。同时，Cortex-M处理器能够帮助开 发者以更低的成本提供更多的功能，其在代码重用和提高开发效率方面有显著优势，所以在嵌入式设备领域的应用 非常广泛。如下为Cortex-M0和Cortex-M3的基本简介。 Cortex-M0采用ARMv6-M结构，基于一个高集成度、低功耗的32位处理器内核；它采用冯·诺伊曼结构，基于 16位的Thumb指令集，并包含Thumb-2技术。 Cortex-M3采用ARMv7-M结构，为32位处理器内核。它采用哈佛结构，拥有独立的指令总线和数据总线，可 以让取指与数据访问并行不悖。 基于以上ARM Cortex-M优点，目前，Rockchip SoC上集成的MCU说明如下： RK3399 集成2个Cortex-M0，其一PMU M0为ATF所用，其二Perilp M0开放给客户使用

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Practical SQL is an approachable and fast-paced guide to SQL (Structured Query Language), the standard programming language for defining, organizing, and exploring data in relational databases. The book focuses on using SQL to find the story your data tells, with the popular open-source database PostgreSQL and the pgAdmin interface as its primary tools. You’ll first cover the fundamentals of databases and the SQL language, then build skills by analyzing data from the U.S. Census and other federal and state government agencies. With exercises and real-world examples in each chapter, this book will teach even those who have never programmed before all the tools necessary to build powerful databases and access information quickly and efficiently.

pytest Quick Start Guide pdf 来源：[pytest Quick Start Guide - 2018.pdf](https://itbooks.ctfile.com/fs/18113597-314070249) Learn the pytest way to write simple tests which can also be used to write complex tests Key Features Become proficient with pytest from day one by solving real-world testing problems Use pytest to write tests more efficiently Scale from simple to complex and functional testing Book Description Python's standard unittest module is based on the xUnit family of frameworks, which has its origins in Smalltalk and Java, and tends to be verbose to use and not easily extensible.The pytest framework on the other hand is very simple to get started, but powerful enough to cover complex testing integration scenarios, being considered by many the true Pythonic approach to testing in Python. In this book, you will learn how to get started right away and get the most out of pytest in your daily work?ow, exploring powerful mechanisms and plugins to facilitate many common testing tasks. You will also see how to use pytest in existing unittest-based test suites and will learn some tricks to make the jump to a pytest-style test suite quickly and easily. What you will learn Write and run simple and complex tests Organize tests in fles and directories Find out how to be more productive on the command line Markers and how to skip, xfail and parametrize tests Explore fxtures and techniques to use them effectively, such as tmpdir, pytestconfg, and monkeypatch Convert unittest suites to pytest using little-known techniques Use third-party plugins Who this book is for This book is for Python programmers that want to learn more about testing. This book is also for QA testers, and those who already benefit from programming with tests daily but want to improve their existing testing tools.

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讲解的比较深入， 感觉难度上和石磊的<>差不多， 不过讲解的可能没有那么细致， 书中还有些事例， 比如教你怎么写一个最小的xen guest的内核，怎么写一个console的驱动等，比较有趣。

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