microcontroller watchdog

Symptom: The PCB board will restart directly from firmware soft reset to bootloader update Problem Reason: IWDG (independent watchdog) is turned on in the firmware, no dog is fed during firmware update, causing The count is counted to 0 and the watchdog resets reset. Problem solving: 1. Since the independent watchdog cannot be turned off once it is turned on,

Independent look at the door clock source internal low-speed clock 128khz divided by 2 is 64khzSelect iwdg_prescaler_12864/128 =0.5 khz 2ms cycle #define iwdg_500ms_rest (uint8) #define iwdg_400ms_rest (uint8) #define IWDG _300ms_rest (uint8) #define iwdg_250ms_rest (uint8) #define Iwdg_200ms_rest (uint8) #define iwdg_100ms_rest (uint8) #define iwdg_50ms_rest (uint8 ) #define iwdg_4ms_rest (uint8) 2 iwdg_writeaccesscmd (iwdg_writeaccess_enable);// Allows operation of inde

Today look at Stm32 window watchdog, suddenly found very abnormal, so did all aspects of the experiment came to the following conclusions, because only the conclusion of the experiment has no official conclusion, so if someone has a theoretical basis please tell me, thank you very much 11. Once the Windows watchdog clock is enabled, the EWIF bit of the SR register will be set to 12. Once the defined window

watchdog we are familiar with, mainly for the system after the crash of automatic reset or active reset of a way, in the system of unmanned duty is essential. But in the general human-computer interaction system, it is closed by default, to use before the first to open it, the following to see how it is used. Before you use it, firsthttps://github.com/tjCFeng/ClassA20 Download the ClassA20 class library.In particular, to use

Some time ago, cgminer was set to start when it was started. Due to various problems, the system was not very stable and it was stopped from time to time. I checked it online, and Raspberry Pi immediately tried the hardware guard function, which basically solved my problem. ? The principle is simple: Watchdog requires heartbeat) If no data is fed within the specified time period (15 seconds by default), the system restarts automatically. ? However, it

In Feature phone's production release version, (1) the system fails to capture memory dump or (2) watchdog timeout when the JTAG is used to analyze the problem. You can disable watchdog to debug the problem, the method for disabling is as follows: The method of disabling watchdog in 11A before is to change the parameter in the WDT_Enable () function to kal_FALSE

/*********************************************************************** * Linux Watchdog Test Program * Description: * Because the previous reset has not been resolved, so this watchdog function has not been processed, * Now the problem solved, so need to join the test program. * 2016-4-15 Shenzhen Nanshan Ping Shan village Zengjianfeng ************************************************************ *********

/** Watchdog usage. * Author: serval li * Date: Jun 27th, 2012 **/# include CodeSave it first and use the watchdog implemented by softdog. C. Its kernel module is named softdog. Ko and is located under/lib/modules/$ kernelver/kernel/Drivers/watchdog.

Bug in STM32F4 Series MCU, window watchdog WWDG. 1. If it is possible to pre-feed the dog interrupt, then the following two points must be met (1) Before turning on the WWDG interrupt, the EWI flag bit in the SR register must be zeroed out, otherwise the watchdog will constantly reset (2) Add a small delay to the WWDG_IRQ, otherwise the watchdog will be const

One: Kernel interruptThe watchdog interrupt in the Linux kernel is similar to that of the previous bare board, and before writing the driver, it is necessary to cut out the Watch dog module that comes with the kernel, or else the error will occur; device Drivers/ Watchdog Timer support/s3c2410 watchdoIn the kernel, we handle an interrupt and must first register an interrupt number, and the function to reg

There are two kinds of libraries for Python monitoring files: pyinotify and watchdog. Pyinotify relies on the inotify of the Linux platform, which encapsulates events from different platforms. In other words, watchdog cross-platform.Let's look at a little demo fromWatchdog.observersImportObserver fromWatchdog.eventsImport *ImportTimeclassFileeventhandler (FileSystemEventHandler):def __init__( Self): FileSys

void Wwdg_init(void){LPC_SC, PCLKSEL0 |= (30); Crossover number is eightLPC_WDT-Wdclksel = ~ (30);LPC_WDT, Wdclksel |= (10); Set WDT clock to APBLPC_WDT, Wdclksel |= (1); Lock Clock SourceLPC_WDT-WDTC = 0xFFFF; Setting overloaded valuesLPC_WDT, wdmod |= (10) | ( 11); Watchdog enable and set trigger resetAt this point the initialization is complete.}Shutdown Total System Interrupt__asm void Nvic_setprimask(void){Cpsid IBX R14}Turn on total system outag

if(p==NULL) * { $Printk"Request error!\n"); Panax Notoginseng return 1; - } the +Gpio_virt = Ioremap (0x11000000, sz_4k); A //Ioremap physical memory to virtual memory mapping the* (unsignedLong*) (Gpio_virt +0x2e0) =1; +* (unsignedLong*) (Gpio_virt +0x2e4) =0; -Printk"Hello led!\n"); $ $Printk"Phys:%p\n", Virt_to_phys (Gpio_virt)); - - return 0; the } - Wuyi voidtest_exit () the { -Printk"Bye bye!\n"); WuIounmap (gpio_virt); -Release_mem_region (0x

A Overview Some important program must keep it running, and always care about its state------------can't let it deadlock. Of course, if a main program has a deadlock, it must be a design or programming error. The first thing we do is to get this bug out. But if the time is tight, this bug and "erratic", then, we still write a software "watchdog", temporarily should be urgent. Description of "Watchdog" req

The watchdog of the recent project has undergone three versions.First version:With PS-EF, if the program hangs, it starts.A second version:program because the runtime will not listen to the 7901 port, so it is not easy to determine whether the machine is hanging, but to determine if this port is listeningA third version:When the 7901 port is no longer listening, the original killall in the start, each output to the content of the file to add the date,

#!/bin/sh# file timestamp to record the heartbeat of spring-rest-Servertimestamp=/usr/apache-tomcat-7.0. the/logs/timestamp.log# Timeout 60stimeout=60000# error Logstderr=/usr/apache-tomcat-7.0. the/logs/tomcat-watchdog.log#1means need to Restartrestart=0# the error infoerrinfo="'# Check whether file existsif[ -e $timestamp]; then# Check whether contains valueif[ -s $timestamp]; Thenstart_time=$ (cat $timestamp) # integer Checkif[1-eq ' echo $start _time|grep-p"^-?\d+$"|WC-l ']; Thenend_time=$ (

Label: style ar use SP file data on log BS Because it is a software watchdog, his role can only be considered as a helper tool. However, its function should be meaningless. The implementation plan of this software is as follows: 1. Software form A module soft_wdt.ko runs in the kernel. 2. software startup Method Insmod soft_wdt.ko Dev =/dev/soft_wdt timeout = 5 log =/path/to/log.txt These parameters are: device files to be exposed to users,

The watchdog of recent projects has undergone three version numbers.First version number:With PS-EF, if the program hangs, it starts.Second version number:The program will not listen to the 7901port when it executes, so it is not easy to infer whether the machine is dead, but to infer if the port is listeningThird version number:When the 7901port is no longer listening, the original killall will be restarted first. Every time you output to a file, add

A simple watchdog script that automatically restarts a process when it is stopped. The script is as follows: 1get_web_srv_sts () 2 { 3 ret = 'ps-AEF | grep "$1" | grep-V grep | WC-l' 4 5 case $ RET in 6 0) 7 fun_ret = "down" 8 ;; 9 1) 10 fun_ret = "up" 11 ;; 12 *) 13 fun_ret = "error: $ RET instances running" 14 ;; 15 esac 16} 17 18 19 get_web_srv_sts "./process1" 20 if [$ fun_ret = 'up'] 21 then 22 echo "process1 running" 23 else 24./process1 25 slee

error, Ack error, format error), error detection, response method (ACK, NACK ), communication Mode (Half Duplex) and other settings; The MAC Sub-layer is the core of the CAN protocol. The function of the data link layer is to form meaningful messages from the physical layer and provide transmission control procedures such as error control. The function of the data link layer is usually executed in the hardware of the CAN controller;Frame concept: Data frame: the frame used by the sending unit t