STM32 and Linux: From hardware to software, the key to mastering the operating system mechanism

Hello, host! I'm not going to talk to you about the big ideas like those above, but I'm going to talk to you about the practical things. Linux and stm32 are a software platform and a hardware platform, which are completely different (remember, they are platforms!). Let’s put it this way, since you like microcontrollers, learn stm32 firstDetailed explanation of embedded Linux device driver development, and lay a solid foundation for hardware, especially various buses (usb, iic, spi...) and various peripheral modules (infrared, temperature and humidity, mpu6050...), and then focus on ucosii, that is to say, learn to complete your tasks within the framework of the operating system, rather than simply writing programs-for the operating system Grasping the mechanism is the key to distance yourself from the MCU friends around you; in this process, you need to understand the true meaning of OS. I suggest you read "Operating System Principles" at this time.

After that, you can get in touch with ARM (why not linux next? I will tell you later). You can buy Friendly Arm or Feilin's s3c2440 development board (does it count as advertising?), or you can buy an A8 board, both of which cost about 500 yuan. When I started learning ARM, it was nothing more than a bare-board program, using assembly and C to control the registers inside the CPU Detailed explanation of embedded Linux device driver development, and then control the peripherals, which is similar to STM32. When you learn to control the peripherals of the development board, congratulations on entering the door of embedded Linux!

At this time, you need to be deeply proficient in C language, and pay attention to GNUC. What does it mean to be proficient in GNUC? You need to know the difference between GNUC and ANSIC, know that a piece of C code is laid out in SDRAM when running, know the flexible usage of watch hands, and know how to use process-oriented C to implement object-oriented thinking skills... You need to read at least three books on C language books (except domestic ones) plus some blog posts. The premise is that you write code in Linux. You can install ubuntu, learn to set environment variables, learn to use vim, use gcc to compile, and learn to use gdb to debug. I suggest you read "Brother Niao's Private Linux Cooking".

After mastering the C Linux course, you can start learning Linux system programming, such as multi-process, multi-thread, and socket programming. It is recommended to start with "Unix Intermediate Environment Programming", and then read "...IPC" and "UNIX Network Programming"...each part is a book! The most important of these are the concurrency control mechanism of shared variables by multi-process/multi-thread, and socket programming - remember to learn them well! ! ! When you finish learning all that, you will fall in love with Linux in just over a year.

Finally, study uboot, Linux kernel tailoring, and file system creation. At this time, the C and Linux system programming you learned later have already been connected with your ARM board.

Finally, why do you still love hardware. You can develop Linux system applications in the direction of embedded Linux driver development. The hardware foundation you have accumulated on stm32 will come in handy at this time. From Linux device models and kernel modules to character device drivers, block device drivers, and network device drivers, develop the habit of using sourceinsight to look at the Linux kernel source code - just think back to the ucosii you first learned. It is recommended that you read "LDD3" and Song's "Linux Device Driver Interpretation". This process takes five years.

Finally, you will find that stm32, s55pvpv210, ucosii, and linux are all called embedded systems.

ps: When I saw your question, I thought of myself at this time this year: I went to a restaurant part-time at night and got beaten, and I went home at night to light up the lights and type code, and I was full of bitter tears...

Also, don’t believe that many products do not use Linux. Those who have not entered the world of Linux will not understand how beautiful Linux is. And don't regard Linux as your ultimate goal. Just like you didn't regard ucosii as your ultimate goal before, the strategy of using operating system mechanisms to solve complex problems is what you should focus on throughout your career - even the z-stack contract stack uses it. The operating system representation layer (OSAL) mechanism has been introduced - this can only be understood but cannot be expressed in words. Take a look at "Unix Design Philosophy" when you have time. You learn and communicate together.

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