To set the system to work in svc privileged mode, we need to set the CPSR program status register from the previous study. In the ARM Architecture Reference Manual pdf document, 2 Program Status Register ...
Watchdog timer, in the embedded field, some devices need to work in some extreme environments, that is, places where people rarely or hard to reach. In the long-term operation, it is inevitable that there will be malfunctions and crashes. ...
In the previous section, when I set up to disable the watchdog, I had already set WTCON[2] to 0, thus disabling the interrupt. As shown in the following figure: This section is to disable the interrupt register: The following is the 2440 chip processing ...
Open the 6410 chip manual and find the vector interrupt control register in 12 VECTORED INTERRUPT CONTROLLERS. Vector interrupts (6410, 210) are often completed by hardware. ...
The mechanism for masking interrupts in the 210 is the same as that in the 6410. Moreover, both are vectored interrupts, and many interrupts are implemented in hardware, unlike the 2440. However, there are 4 interrupt mask registers in the 210: ...
Let's look at the ARM memory hierarchy: you can see that the fastest are the processor and internal registers, which are few in number and very expensive. Next is the TCM tightly coupled memory: cache and main memory ...
Led can be used as a tool for debugging programs: In the early stages of development of embedded system software, such as Bootloader and kernel, since hardware such as serial ports have not yet been initialized, debugging methods are quite useful. ...
ARM system clock initialization: This requires knowing what is a clock pulse signal, what is a clock frequency, and what is a clock source. Clock pulse signal: Clock pulse signal: a certain voltage amplitude, a ...
Classification of memory: Memory has become an indispensable component in PC or embedded hardware platform due to its advantages such as fast access speed and simple access method. Before you start learning how to use memory, ...
First, let's look at the address lines of 2440: mini2440 schematic pdf The 2440 chip provides 27 address lines = 128M. The S3c2440 chip provides only 27 address lines addr[0:26] on the pins provided to the outside. ...
6410 address space distribution: S3C6410 processor has a 32-bit address bus, and its address space is. The upper part is reserved for peripherals, and the lower 2GB area can be divided into two parts: main storage area and peripheral area. ...
In C language, initialized global variables are stored in the data segment, initialized local variables are stored in the stack, space allocated by malloc is stored in the heap, and uninitialized global variables are stored in the b ...
An absolute jump must be used to jump from assembly to C: Project code: Add main in Makefile o:Start S:Make Compile: Main C code: define GPKCON (volatile unsigned ...
Create a new light c: modify start S: modify Makefile: add light o Finally, make succeeds and the burning is successful. Similarly, we can also call the function in our assembly in the C function: modify star ...
...
1 ARM register brief explanation From the ARM Architecture Reference Manual pdf, we can get information: 31 general registers, 6 status registers (one cpsr, 5 spsr). ...
The reason for using assembly is very simple, that is, the efficiency of assembly code. When the machine starts, the efficiency of assembly is used to initialize the hardware and provide conditions for loading the kernel. ...
First, the assembly program is converted into machine code before it can be run in the machine. First, we disassemble the elf file generated in the bare metal code above: start elf: file format elf32-li ...
Coprocessors are used to perform specific processing tasks. For example, a coprocessor for mathematical calculations can control digital processing to reduce the burden on the processor. ARM can support up to 16 coprocessors, including CP1 ...
This is the manual information. We can see that to set the svc mode, we just need to set the last five bits of our cpsr to 0b10011. Cpsr structure: Next, we will set the last five bits of cpsr to ...
Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
MCU C language programming and Proteus simulation technology (Xu Aijun)Single-chip microcomputer C language programming and simulation100 Examples of Microcontroller C Language Applications (with CD-ROM, 3rd Edition) (Wang Huiliang, Wang Dongfeng, Dong Guanqiang)Fundamentals and Applications of Single Chip Microcomputers (Edited by Zhang Liguang and Chen Zhongxiao)Microcontroller skills and production (Edited by Chen Zhongjie)Single-chip microcomputer technology and application - electronic circuit design, simulation and production (edited by Zhou Runjing)Capture desktop image information regularly in winceDevelopment Trend of European BusesResearch on keyboard optimization coding technology for single chip microcomputer application systemGSM GPRS EGPRSNC7SZ373Design of PN Code Generator Based on Virtex-5Journal article: Siggraph 2003 - Character Setup & RiggingC++_GUI_QT3 Programming_Chinese VersionFinite element method to calculate fiber modeMCU and HMI connection technical specificationsEEWorld
subscription
account
EEWorld
service
account
Automotive
development
circle
About Us Customer Service Contact Information Datasheet Sitemap LatestNews
Site relate： Comprehensive Information 51 single chip microcomputer PIC Microcontroller AVR MCU ARM MCU Embedded Systems Automotive Electronics Consumer Electronics Data processing Video Tutorial Electronic Encyclopedia Other technologies STM32 MSP430 MCU Resource Download Microcontroller exercises and tutorials
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
京公网安备 11010802033920号
BCR583