Programmer Group

What is a label When publishing a version, we usually tag it in the version library first, so that we can only determine the version at the time of labeling. Whenever a label version is taken in the future, it is the historical version of the labeled time. Therefore, the tag is also a snapshot of the version library. Although the Git tag is a ...

preface Recently, I bought a month's standard example on Tencent cloud Internet of things platform and sent an ESP-12S development board to start the systematic learning of ESP8266. Therefore, I have reinstalled ubuntu several times. After thinking about it, I'd better record the ESP8266_ RTOS_ SDK_ The linux environment of V3.0 is built step ...

catalogue 1. What is a device tree? 2. Structure of equipment tree 3. Node structure 4. Node standard attributes 4.1 compatible 4.2 status 4.3 #address-cells #size-cells 4.4 reg 4.5 name 4.6 device_type 4.7 phandle 4.8 virtul-reg 4.9 range 4.10 dma-range 5. Special nodes 5.1 /aliases node 5.2 /chosen node 6."of_" cor ...

Gazebo robot simulation learning notes 1, Experimental preparation Refer to the video tutorial: 70 minute quick start Gazebo robot simulation. Experimental function Pack: git clone https://gitee.com/bingda-robot/bingda_tutorials Some third-party feature packs 2, world model building 1) Install the official model library of Gazebo gi ...

Catalogue of series articles Tip: you can add the directories of all articles in the series here. You need to add the directories manually TODO: finishing after writing preface Limited cognition, I hope you will forgive me. If you have any problems, I hope to communicate with you and grow together! This paper first makes a brief in ...

Knowledge summary of open source web framework django (10) Asynchronous scheme Celery Producer consumer design model reflection: What's wrong with the following two lines of code? CCP().send_template_sms(mobile, [sms_code, 5], 1) return JsonResponse({'code': 0,'errmsg': 'ok'}) Question: Our code is executed synchronously from to ...

When I first wrote a blog, there were too many solutions to similar problems on CSDN, but they couldn't solve my problem. This time, it was not easy to solve my problem. I hope to record this solution and help students with similar problems. Maybe it's written incorrectly, maybe it's written so that people don't understand it. In fact, the p ...

1, Introduction to c language helloworld 1. Open the terminal under ubuntu system 2. Find the appropriate location and create a new folder helloworld. mkdir helloworld 3. Open the helloworld folder cd helloworld As shown in the figure 4. Create and open a c language file named hello.c with vim vi hello.c 5. Enter the following ...

1, Serial port transmission file 1. Serial port connection Cross connect the RXD and TXD pins of the two USB TO TTL serial ports, and connect the two USB interfaces to a laptop respectively to realize the serial port transmission between the two computers. Serial Interface is referred to as serial port for short. Serial Interface refers t ...

1, Principle of Chinese character lattice font 1, Chinese character coding 1. Location code The national standard code is a four digit hexadecimal number, and the location code is a four digit decimal number. Each national standard code or location code corresponds to a unique Chinese character or symbol. However, because we rarely use hexad ...