microcontroller watchdog

This article from: http://www.openedv.com/posts/list/302.htmAuthor Zhang YangThe clock system is the core of the processor, so it is necessary to learn the clock system carefully before learning STM32 all the peripherals, which helps to understand the STM32 deeply.Here is a STM32 clock diagram from the Internet, which looks clearer than the one in the STM32 Chinese reference manual: Important Clocks:The relationship between PLLCLK,SYSCLK,HCKL,PCLK1,PCLK2 to be clear;1, HSI: high-speed inte

The type of memory determines the operation and performance of the entire embedded system. Therefore, the selection of memory is a very important decision. Whether powered by battery or mains, application requirements determine the type of memory (volatile or non-volatile) and purpose of use (storing code, data, or both ). In addition, memory size and cost are also important factors to consider during the selection process. For smaller systems, the memory provided by the

smart device cracking. 0 × 01 first recognized smart sockets Today, I chose this plug-in for analysis and research.Bo Lian's SP2 (smart plug)Why is this socket widely used, and the smart energy provided by the component manufacturer marvell is also widely used in domestic entrepreneurial teams, it is reported that the Xiaomi outlet also uses the marvell solution. Appearance, for example, is the main character of our research today. By disassembling the socket, we know some chips and component

1. Clock source Three different clock sources can do the system clock (SYSCLK):HSI oscillator Clock: high-speed internal clockHSE oscillator Clock: high-speed external clockPLL ClockTwo x two-level clocksLSI (Low speed internal clock): 32kHz low-speed internal RC (LSI RC) Independent watchdog clock Source, RTC can be used for automatic wake-up stop/Standby mode.LSE (Low Speed external clock): 32.768kHz Low SPEED external oscillator (LSE cryst

I heard people say that C # has no pointer, because it is not safe. Baidu just said this: Now, you need to operate the hardware watchdog to know that C # can also operate the pointer.Program environment:. Net microframeworkDevelopment tools: Visual Studio 2013Development language: C #Communication tool: New Life CAPTCHA ToolProgram function: our development hardware may crash in special peripheral circumstances. The solution is to use the

(Embedded real-time operating system rtos nuttx 7.1)NuttX introduction reprint please indicate the source: http://blog.csdn.net/zhumaill/article/details/241976371. NuttX real-time operating systemNuttX is a real-time operating system (RTOS) that emphasizes standard compatibility and small encapsulation, and is highly scalable from an 8-bit to 32-Bit Microcontroller environment. NuttX follows Posix and ANSI standards. For features not supported under t

(Embedded real-time operating system rtos nuttx 7.1) description 1. The real-time operating system of NuttX is a real-time operating system (RTOS), which emphasizes standard compatibility and small encapsulation, highly scalable from 8-bit to 32-Bit Microcontroller environments. NuttX follows Posix and ANSI standards. For features not supported under these standards, or features not applicable to deep-embedded environments (such as fork ()), use addit

bus, that is, it can not read directly on a power CPU, it needs the CPU to run some initialization software and then read and write through the sequential interface. (4) PC: Very small capacity bios (Norflash) + Large capacity hard disk (similar to Nandflash) + Large capacity dram, microcontroller: Small capacity norflash+ very small capacity SRAM; Embedded system: Because Norflash is expensive, Today's embedded systems tend to be used instead of No

net and media folders.Accessibility-These drivers provide support for some assistive devices. In Linux 3.9.4, only one driver in this folder is the Braille device driver.ACPI-Advanced Configuration and Power Interface (acpi:advanced configuration and Power Interface) drivers are used to manage power usage.Amba-Advanced Microcontroller Bus architecture (amba:advanced microcontroller bus Architecture) is a p

(for storing code and data) 0x20000000-0x20010000 RAM2 64KB (runtime stack space) 0x20010000-0x20020000 RAM3 64KB (bootrom runtime stack space) 3. AON domain static memory, 0x480c0000-0x480c1000 4KB AON Domain (used to store critical information even after a power outage, can continue to use after wake up) The startup process is as follows: 1. Bootrom reads 4 bytes of data from 0 addresses as the value of the initial MSP (primary stack), and then takes over the MCU (

while (1) is used in single chip microcomputer, while (1); Meaning: This is a dead loop, and the code no longer executes downward. Use: 1. Generally in debugging code, in order to detect a part of the code is OK, to prevent the subsequent code interference execution results, will be in the observation point plus while (1); 2. Some code detects a run error, throws an error (printing, setting the error code), and then enters while (1); 3. When the machine needs to be reset, stop feeding the