Programmer Think

Software preparation: FreeModbus source code: Source code address of FreeModbus master and slave Development tools: Keilv5 and CubeMX Hardware platform: STM32F407VET6 (with RS485 interface) 1. Generate Keil project with CubeMX: Skip other basic parts. Here are some points that need attention. Configure the system debugging pin and select the ...

SIGNAL Signals appeared in early Unix, and the early signal model is unreliable. BSD and System V extend the early signals respectively, but they are incompatible with each other. POSIX unifies the above two models, thus providing a reliable signal model. 1. Basic concept of signal It is used for communication between processes. It can inter ...

1, Environmental preparation Compilation environment: Ubuntu 20 . 04 (Download address: https://ubuntu.com/download/desktop) QT Source code( QT5.9.5 Download address: https://download.qt.io/archive/qt/5.9/5.9.5/) Cross compiler( arm-2014.05) 2, Compilation preparation 1.decompression qt Source code 2.Configure the path of the cross compiler ...

1. Related concepts of interruption The main interaction modes between the kernel and peripherals: polling and interrupt The way of polling seems fair, but the actual work efficiency is very low and can not respond to emergencies in time The interrupt system makes the kernel have the ability to deal with sudden conditions interrupt ...

  1. Foreword Python is a very easy-to-use explanatory language. Its main features are as follows: Easy to learn and useScalable and portableRich third-party library It is precisely because of these characteristics that Python is widely used in some scenes with simple logic and complex functions. In recent years, with the rapid development ...

1, Purpose and task of the experiment 1. Familiar with the characteristics and working principle of single bus and DS18B20 sensor. 2. Master the hardware structure and program design method of digital thermometer. 2, Introduction to experimental principle ZSC-1 experimental box is equipped with DS18B20 digital temperature sensor, LED nixie ...

reference material: Rafael C. Gonzalez, Richard E. Woods, digital image processing (Third Edition) 4.11, Supporting book resourcesAlan V.Oppenheim, Ronald W.Schafer, discrete time signal processing (Third Edition) 9.5SPRUEB8B - TMS320C64x+ DSP Little-Endian DSP Library Programmer's ReferenceCCS Doc, 7.8 Image Analyzer Introduction to FFT ...

Fundamentals of interruption Nesting: Nested vector interrupt controller NVIC (nested vector interrupt controller) is tightly coupled with the kernel. It provides the following functions: nested interrupt support, vector interrupt support, dynamic priority adjustment support, greatly shortening interrupt delay and shielding interrupt. Al ...

Reentrant and non reentrant Reprint: https://www.cnblogs.com/reality-soul/p/6140932.html It is mainly used in multitasking environment. A reentrant function is simply a function that can be interrupted, that is, it can be interrupted at any time when the function is executed, transferred to OS scheduling to execute another piece of code, and th ...

1. Get key code There is little difference between mouse and keyboard in code implementation, so we can imitate the other as long as we complete one of them. Because after pressing a key before, nothing else can be done. Modify init inthandler21 function in C #define PORT_KEYDAT 0x0060 / / the device number is specified by IBM. For detail ...