Tag：register
-
Time：2021-9-17
system call In our daily coding, we usually write user layer code. The kernel seems transparent to us and has not been paid attention to. But the program is dealing with the kernel all the time. For example, when reading a file or writing a file, it will pass through the kernel. The user program […]
-
Time：2021-9-10
Let’s look at the effect first 74HC595 is a commonly used serial to parallel chip, which supports chip cascade to realize the function of a small number of IO ports controlling the output of multiple IO ports Pin 14: DS, serial data input pin Pin 13: OE, output enable control pin, it is low power […]
-
Time：2021-9-10
This article was originally published by RT thread forum account 123:https://club.rt-thread.org/as… Guide for use analysis and troubleshooting of RTT serial port V1 Version (II) Analysis of serial port related problems UndertakeGuide for use analysis and troubleshooting of RTT serial port V1 Version (I)article. Combined with the feedback information during the use of serial port, this […]
-
Time：2021-9-9
Series catalog Preface preparation BIOS boot to real mode GDT and protection mode On virtual memory Load and enter the kernel Display and print Global descriptor table GDT Interrupt processing Virtual memory perfection Implement heap and malloc First kernel thread Multithreading operation and switching Lock and multithreading synchronization Enter user status Process implementation system call […]
-
Time：2021-9-8
The origin of everything Turing machine Turing machine is mainly composed of data storage unit, control unit, operation unit and a read-write head for reading and writing external data.Turing machine needs a paper tape. The paper tape is covered with a grid. Characters can be recorded on the grid. Characters can be divided into data […]
-
Time：2021-9-5
Hello, I’m ruffian Heng, a serious technical ruffian. What ruffian Heng introduced to you today isTaking the GPIO module of i.mxrt as an example, this paper discusses the standard flow of interrupt handler (irqhandler)。 In the old prose of ruffian HengDesign and implementation of serial port (UART) automatic baud rate identification program (interrupt)In, we use […]
-
Time：2021-9-3
Hello, I’m ruffian Heng, a serious technical ruffian. What ruffian Heng introduced to you today isCompare the similarities and differences between I. mxrt and LPC in the use of RTC peripheral gpreg register。 This article isApplication of GPR register that systemreset does not reset in i.mxrt1xxx in SBL project practiceAs a continuation of the article, […]
-
Time：2021-9-2
This article is a detailed analysis and introduction of the meaning of the keyword volatile in C language, hoping to help you in your study. Volatile is a type modifier. It is designed to modify variables accessed and modified by different threads. Without volatile, it will basically lead to the result that either you […]
-
Time：2021-9-2
1. Basic knowledge Porting kernel requires high and detailed technology. 1.1 MCU related knowledge Function of stack Load address, link address Relocation A few simple hardware knowledge Serial port timer timer Concept of interrupt 1.2 Linux operation related knowledge Linux common commands Simple script: script is to write commands in a file Makefile GCC compile […]
-
Time：2021-8-28
Hello, I’m ruffian Heng, a serious technical ruffian. What ruffian Heng shared with you today isDesign of standard triple interrupt control in embedded MCU。 We know that the reason why the program code can complete the multi task parallel real-time processing function in MCU bare metal machine is mainly scheduled by interrupt. Without interrupt, the […]
-
Time：2021-8-25
Hello, I’m ruffian Heng, a serious technical ruffian. What ruffian Heng introduced to you today isi. Different snvs GPR register read-write control design on mxrt1010 and 1170 models。 Ruffian Heng’s previous two articlesApplication of GPR register that systemreset does not reset in i.mxrt1xxx in SBL project practice、Comparing the similarities and differences between I. mxrt and […]
-
Time：2021-8-13
Hello, I’m yes. You’ve probably heard of segmentation, paging, and page segmentation about memory access. But why segment? Why pagination? With paging, why segment? This requires a look at the development of history. After knowing history, you will know that all this is natural. These concepts are not forced out. text On November 15, 1971, […]
