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Checksum and CRC CentralCyclic Redundancy Codes, Checksums, and related issues for computer system data integrity.
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Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity.
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Checksum and CRC Central | checksumcrc.blogspot.com Reviews
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Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity.
checksumcrc.blogspot.com
Checksum and CRC Central: CRC for Protecting A Single Value
http://checksumcrc.blogspot.com/2012/01/crc-for-protecting-single-value.html
Checksum and CRC Central. Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity. Sunday, January 1, 2012. CRC for Protecting A Single Value. Some critical applications need to protect a single byte or word of data in memory against corruption. (For example, if you want to be extra-sure about protecting EEPROM values against corruption. Protecting an 8-bit data word:. 8-bit CRC: HD=5; 0x9C = x 8 x 5 x 4 x 3 1. Protecting a 16-bit data word:. The hex number has an implic...
Checksum and CRC Central: Consolidated Wikipedia Pointers for Checksums and CRCs
http://checksumcrc.blogspot.com/2012/01/wikipedia-pointers.html
Checksum and CRC Central. Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity. Sunday, January 15, 2012. Consolidated Wikipedia Pointers for Checksums and CRCs. Here are some starting points within Wikipedia if you are interested in checksum and CRC background. (These articles also point to other places of interest.) Over time I hope to distill the practical application of all this in my blog, but for now these are reasonable starting points. It is important to reali...
Checksum and CRC Central: August 2014
http://checksumcrc.blogspot.com/2014_08_01_archive.html
Checksum and CRC Central. Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity. Thursday, August 14, 2014. Significant update to on-line CRC performance data. I've managed to create a new set of pages with CRC performance data during my hobby time this summer. Http:/ users.ece.cmu.edu/ koopman/crc/index.html. CRC Polynomial Zoo with Hamming Weight Data. Http:/ users.ece.cmu.edu/ koopman/crc/hw data.html. Monday, August 4, 2014. Thanks to Prof. Berthold Gick at Uni...
Checksum and CRC Central: May 2012
http://checksumcrc.blogspot.com/2012_05_01_archive.html
Checksum and CRC Central. Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity. Saturday, May 12, 2012. CRC and Checksum Tutorial Slides. Meanwhile, you can find the slides here:. Http:/ www.ece.cmu.edu/ koopman/pubs/KoopmanCRCWebinar9May2012.pdf. Motivation - why isn't this a solved problem? Parity computations as an example. Error code construction and evaluation (without scary math). Example using parity codes. Commonly used checksums and their performance. If you ...
Checksum and CRC Central: FAA CRC Report
http://checksumcrc.blogspot.com/2015/04/faa-crc-report.html
Checksum and CRC Central. Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity. Saturday, April 11, 2015. After an extensive editing and approval process, the FAA has released the report that I did with Kevin Driscoll and Brendan Hall from Honeywell. You can see it here:. Selection of Cyclic Redundancy Code and Checksum Algorithms to Ensure Critical Data Integrity. Http:/ www.tc.faa.gov/its/worldpac/techrpt/tc14-49.pdf. Subscribe to: Post Comments (Atom).
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Better Embedded System SW: How To Report An Unintended Acceleration Problem
http://betterembsw.blogspot.com/2015/05/how-to-report-unintended-acceleration.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Friday, May 1, 2015. How To Report An Unintended Acceleration Problem. Every once in a while I get e-mail from someone concerned about unintended acceleration that has happened to them or someone they know. Commonly they go to the car dealer and get told (directly or indirectly) that it must have been the driver's fault. I'm sure that must be a frustrating experience. For t...
Better Embedded System SW: February 2015
http://betterembsw.blogspot.com/2015_02_01_archive.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Monday, February 2, 2015. Tester To Developer Ratio Should Be 1:1 For A Typical Embedded Project. Taking all this into account, below is a rough shot at how effort across a project should break down in terms of head counts and staff. Head count for a 20 person project:. 1 SQA (both training and auditing). 17%: Developer team: V&V (peer reviews, unit test). Bull; Embedded So...
Better Embedded System SW: Not Getting Software Wrong
http://betterembsw.blogspot.com/2014/11/not-getting-software-wrong.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Monday, November 17, 2014. Not Getting Software Wrong. The majority of time creating software is typically spent making sure that you got the software right (or if it's not, it should be! This may seem like just a bit of word play, but I've come to believe that it reflects a fundamental difference in how one views software quality. Turn off all wheel motors. Well, from our ...
Better Embedded System SW: May 2015
http://betterembsw.blogspot.com/2015_05_01_archive.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Sunday, May 3, 2015. Counter Rollover Bites Boeing 787. Counter rollover is a classic mistake in computer software. And, it just bit the Boeing 787. I thought not.) The fix is turning off the power and turning it back on every 120 days. That's right - the FAA is telling the airlines they have to do a maintenance reboot of their planes. If you want to dig further, there is a...
Better Embedded System SW: Avoiding EEPROM corruption problems
http://betterembsw.blogspot.com/2011/11/avoiding-eeprom-corruption-problems.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Sunday, November 27, 2011. Avoiding EEPROM corruption problems. EEPROM is invaluable for storing operating parameters, error codes, and other non-volatile data. But it can also be a source of problems if stored values get corrupted. Here are some good practices for avoiding EEPROM problems and increasing EEPROM reliability. Do you re-initialize the EEPROM when the CPU power...
Better Embedded System SW: September 2014
http://betterembsw.blogspot.com/2014_09_01_archive.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Monday, September 29, 2014. Go Beyond System Functional Testing To Ensure Safety. Testing alone is insufficient to ensure safety in critical systems. Other technical approaches and software development process management approaches must also be used to assure sufficient software integrity. Accepted practices require a holistic approach to safety, including executing a well-...
Cyclic redundancy check - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Crc32
From Wikipedia, the free encyclopedia. It has been suggested that Computation of cyclic redundancy checks. And Mathematics of cyclic redundancy checks. Into this article. ( Discuss. Proposed since March 2016. A cyclic redundancy check. Is an error-detecting code. Commonly used in digital networks. And storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value. Attached, based on the remainder of a polynomial division. Is based on cyclic. Cyclic...
Better Embedded System SW: July 2014
http://betterembsw.blogspot.com/2014_07_01_archive.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Wednesday, July 23, 2014. Don’t Overflow the Stack. Somewhere in your embedded system is the stack (or several of them for some multitasking systems). If you blow up the stack, your software will crash. Or worse. Also, you shouldn’t ever use recursion in a safety critical embedded system. (This shouldn’t even need to be said, but apparently it does.). Some processors have a...
Better Embedded System SW: Better Embedded System Software: The Book
http://betterembsw.blogspot.com/2010/05/test-post.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Sunday, May 2, 2010. Better Embedded System Software: The Book. You can get it direct from the publisher for a good discount by following this link: http:/ koopman.us/book.html. Click on the link for chapter 19 on Global Variables to see the free sample chapter. How much paper is enough? How much paper is too much? Tracing requirements to test. Global variables are evil.
Better Embedded System SW: Embedded Software Costs $15-$40 per line of code
http://betterembsw.blogspot.com/2010/10/embedded-software-costs-15-40-per-line.html
Better Embedded System SW. Companion blog to the book Better Embedded System Software by Phil Koopman at Carnegie Mellon University. Saturday, October 2, 2010. Embedded Software Costs $15-$40 per line of code. Have you ever wondered how much software costs? But that is what our brains remember as being how long it takes to write that much code.). I've had the opportunity to see how much it really costs embedded system companies to produce code. COST (in dollars) includes:. In other words, you have to acc...
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Checksum Calculator
Checksum Calculator is a free file checksum calculation utility, it can support the most commonly used file checksum algorithm, such as md5, crc32, and sha1, can batch process multiple files. This verification software has some useful features, but it is easy to understand and very easy to use. Free for personal/home users, this software is a freeware. After you have finished adding files, if you do not want to check some files, you can select them in the file list, then use the "Remove" button to remove...
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Checksum and CRC Central
Checksum and CRC Central. Cyclic Redundancy Codes, Checksums, and related issues for computer system data integrity. Saturday, March 11, 2017. Video on Hamming Codes and Hamming Distance. Nice video that talks about Hamming Codes and gives a hypercube explanation that helps understand Hamming Distance. Sunday, January 22, 2017. Tuesday, July 28, 2015. Significantly updated CRC data. New summary tables: http:/ users.ece.cmu.edu/ koopman/crc/. Recommendations for "good" polynomials with various HD values a...
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The owner of checksumdb.org. Is offering it for sale for an asking price of 299 USD! This page provided to the domain owner free. By Sedo's Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does not constitute or imply its association, endorsement or recommendation.
checksumerror.net - This website is for sale! - checksumerror Resources and Information.
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checksumerror.org - This website is for sale! - checksumerror Resources and Information.
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CheckSum InfoSoft Pvt Ltd.
Welcome to CheckSum InfoSoft. CheckSum InfoSoft is driven by talented and principled people who are passionate about software. Amazing work for our customers is the motivation behind our team. Started in 2009, software development at CheckSum InfoSoft is based on good ideas - best practices like collaboration, feedback and continuous improvement. We take great pride in building strategic long term relationships with our customers. Testing and QA COE. These COEs have experienced and dedicated consulting t...
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