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24.1 about DMA DMA(Direct Memory Access) direct memory access can greatly reduce the workload of CPU. The CPU executes instructions according to the content of the code. Some of these instructions are used for calculation, some for control programs, and some for transferring data. Among them, the instructions to transfer data, especially a lar ...

Blocking state: if a task is currently waiting for an external event, it is said to be in blocking state. The delay in rtos is called blocking delay, that is, when a task needs to delay, it will give up the right to use the CPU and enter the blocking state. During the period when the task is blocked, the CPU can execute other tasks (if oth ...

Interrupt the tasklet below tasklet related knowledge points What is a tasklet? tasklet is a commonly used method for interrupt processing. tasklet is a special soft interrupt. The following mechanisms for handling interrupts include work queues and soft interrupts. How to use tasklet s to design interrupts? Interrupt occurrence, dealing w ...

ZYNQ AC7020 I brief introduction No matter which development board to learn, it starts from lighting the light, just like the software originated from hello world. Here I use the AC7020 development board of 7000 series. Today I will talk about the GPIO control of 7000 series Note that GPIO here is divided into three categories: GPIOMI ...

Article catalogue preface Reference blog https://blog.csdn.net/tingtie1438/article/details/82085199 Ubuntu16. Python 3.04 system 5+caffe+opencv3. 4.0+cudnn7. 0+cuda9. 0 installation process (detailed arrangement of the whole process) https://blog.csdn.net/qq_42998120/article/details/105567998 ubuntu16. Installation and version correspondence ...

1. Function introduction The current designed attendance system is mainly used by college teachers. During class, students enter the classroom, take out their student card and open their attendance. They can apply for leave in the system and view all class attendance information during school. Considering the large number of students in the w ...

catalogue background Implementation method development environment code implementation reference resources background When using STM32 for project development, two channels of input acquisition are required. At the beginning, using different timers for acquisition can meet the requirements. However, when a new demand comes, multiple PW ...

1. Brief introduction to LCD12864 display principle 1.1 brief introduction to liquid crystal principle In fact, the LCD screen is composed of pixels, and there are several pixels in each row and column. The data bit width (or pixel depth) occupied by each pixel is different for different types of screens. For example, for A true color screen, ...

catalogue 4. System clock configuration 1. Experiment contents and steps: 2. Hardware description 3. Register description 1. Set PLL (i.e. 1,2,3) 2. Set the read / write cycle (i.e. 4) 3. Start HSE and PLL 4. Set SW (i.e. 5) 5. Set AHB, APB1 and APB2 (i.e. 6) 4. Program design (register) 5. Program design (Standard Library) 6. Progr ...

Embedded introductory Learning Series notes index 1, Introduction to Linux 2, deb package management 3, Special characters in shell 4, Linux common commands 5, shell programming catalogue 1, shell and variables 1.shell script Basics 2.shell variables 2.1 user defined variables 2.2} position variables (command line parameters) 2.3 p ...