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Linux device driven--I2C bus __linux

2 I2C Subsystem 2.1 LINUXI2C Subsystem Architecture The I2C subsystem is already available in the kernel, so you must familiarize yourself with the subsystem before you can do the I2C drive. 2.2 Three major components 1, I2C core (I2c-core) The I2C core provides I2C bus driver and device-driven registration, logoff methods, I2C communication methods (algorithm), code that is not specific to the adapter, and probe devices, upper-level code for detecting device addresses, and so on. 2, I2C bus

Linux device driver Subsystem first bullet-I2C __linux

, including the I2C main device that the I2C attaches to the device struct I2c_adapter *adapter The I2C from the device driver struct I2c_driver *driver as a member variable that I2C from the device, such as addr, name, and so on, which is specific to the device driver, attached to I2C 2.2 I2c_adapter struct I2c_adapter {struct module *owner;unsigned int id;unsigned int class;const struct I2C_ALGORITHM *algo; * * The algorithm to access the bus * *voi

Linux device driver Subsystem-i2c__linux

device that is mounted on the I2C bus, the data structure required by the device, including the I2C main device that the I2C attaches to the device struct I2c_adapter *adapter The I2C from the device driver struct I2c_driver *driver as a member variable that I2C from the device, such as addr, name, and so on, which is specific to the device driver, attached to I2C 2.2 I2c_adapter struct I2c_adapter {struct module *owner;unsigned int id;unsigned int class;const struct I2C_ALGORITHM *

Super Server APACHE+MYSQL+PHP+SSL Complete installation strategy (2)

cert) | | CRT=/PATH/TO/YOUR.CRT [Key=/path/to/your.key] | | | | Use Type=dummy ' re a vendor package maintainer, | | The type=test when you ' re a admin but want to does tests only, | | The Type=custom the ' re an admin willing to run a real server | | and type=existing when you ' re an admin who upgrades a server. | | (the default is Type=test) | | | | Additionally add Algo=rsa (default) or ALGO=

Understand PHP hash function, enhance password security

algorithm, cost and salt Let ' s call it $full _salt $full _salt = substr ($hash, 0, 29); Run the hash function on $password $new _hash = Crypt ($password, $full _salt); Returns TRUE or False return ($hash = = $new _hash); } Run it and we'll see "Access granted!" 8. IntegrateBased on some of the above discussions, we have written a tool class: Copy CodeThe code is as follows: Class Passhash { Blowfish private static $algo = ' $2a '; Cost paramete

Css3 elastic Box Model

property of the special pattern (all characters in pattern are different), when searching, do not need to backtrack I, when see a mismatch just set j to next [j].Finite Automata: preconstructing the FA jump table, when searching, do not need to backtrack I, when see any character in txt [], just jump to a state accordingly. 2. when we are searching, can we predict if txt [I... I + M-1] and pat [0... M-1] are possible to be matchable? The answer is yes: Rabin-Karp.Rabin-Karp: precomputing the ha

A consistent hash algorithm in Jedis

"http://my.oschina.net/u/866190/blog/192286"Jredis is a Redis Java client, through Sharde to implement load routing, has been very curious jredis sharde how to achieve, opened Jredis source research, so-called Sharde is a consistent hash algorithm. In fact, through its source code can be seen consistent hash algorithm implementation or relatively simple. The main implementation class is Redis.clients.util.sharded 1234567891011121314151617181920212223242526272829303132333435363738394

IPtables 3: explicit scaling rule

from, January 1, July 20 to, January 1, July 30Iptables-A input-d 192.168.1.1-p tcp -- dport 80-m time -- timestart 08:30:00 -- timestop 14:30:00 -- datestart -- datestop-j ACCEPTAccess to the web service on the local machine is allowed from to on October 30 to October 30.7-string with explicit expansion: character restrictions (limited matching for Chinese characters)-M string-- Algo bm | specify the character Matching Algorithm for kmp-- StringIpta

OpenWrt router iptables firewall settings

OpenWrt's built-in Firewall is a bit complicated. You can reconfigure iptables as needed to meet general user requirements. #/Bin/bash# OpenWrt firewall, applicable to RG100AAIptables-FIptables-XIptables-ZIptables-P INPUT DROPIptables-P OUTPUT ACCEPTIptables-P FORWARD DROPIptables-a input-I lo-j ACCEPTIptables-a input-I br-lan-j ACCEPT# Iptables-a input-m string -- algo bm -- string "sex"-j DROPIptables-a input-m state -- state RELATED, ESTABLISHED-j

[Learn More-memcached] memcached Distributed Algorithm

distributed algorithm. The first memcached client function library that supports consistent hashing and virtual nodes is the PHP library named libketama, developed by last. FM. Libketama-a consistent hashing algo for memcache clients-RJ has already existed-users at last. fm As for the Perl client, cache: memcached: fast and cache: memcached: libmemcached support for consistent hashing as described in the 1st serialization. Cache: memcached: Fast

Detailed description of mencoder and FFMPEG Parameters

for the second time.-select "file" as the record file twice in passlogfile.C) advanced video options-G gop_size set image group size-intra only applies to intra-frame encoding-qscale Q uses fixed video quantization scales (VBR) -qmin Q minimum video Quantization Scale (VBR)-Qmax Q maximum video Quantization Scale (VBR)-maximum deviation between qdiff Q quantization scales (VBR) -qblur blur video Quantization Scale softening (VBR)-qcomp compression video Quantization Scale compression (VBR) -Ini

FFmpeg parameter description <Article 3>

at a specific interval-Me method: the available methods for setting motion estimation are zero phods log X1 EPZs (default) full-Dct_algo algo: the default DCT 1 ff_dct_fastint 2 ff_dct_int 3 ff_dct_mmx 4 ff_dct_mlib 5 ff_dct_altivec can be used to set the DCT algorithm.-Idct_algo algo: sets the IDCT algorithm. There are 0 ff_idct_auto default IDCT 1 ff_idct_int 2 ff_idct_simple 3 limit 4 limit 5 ff_idct_ps

Linux operating system I2C driver architecture explanation

struct i2c_algorithm to describe: static struct i2c_adapter pb1550_board_adapter = { name: "pb1550 adapter", id: I2C_HW_AU1550_PSC, algo: NULL, algo_data: pb1550_i2c_info, inc_use: pb1550_inc_use, dec_use: pb1550_dec_use, client_register: pb1550_reg, client_unregister: pb1550_unreg, client_count: 0,}; In this example, a driver named "pb1550 adapter" is

FFmpeg parameter description

bit rate is generated for the second time. -Passlogfile: Select File as the record file twice. C) advanced video options -G gop_size: Set the image group size. -Intra only applies to intra-frame encoding. -Qscale Q uses a fixed video Quantization Scale (VBR) -Qmin Q minimum video Quantization Scale (VBR) -Qmax Q maximum video Quantization Scale (VBR) -Maximum deviation between qdiff Q quantization scales (VBR) -Qblur: Video quantization Scaling (VBR) -Qcomp compression video Quantization Scale

Algorithms-related websites

://www.bitwise.iitkgp.ernet.in/home45 http://contest.felk.cvut.cz/46 http://plg1.cs.uwaterloo.ca/~acm00/47 http://www.informatik.uni-ulm.de/acm/index-en.html48 http://www.allisons.org49 http://apio.olympiad.org/50 http://www.csie.ntnu.edu.tw/~u91029/51 http://ncpc.idi.ntnu.no/52 http://acm.cugb.edu.cn/JudgeOnline/53 http://cgm.cs.mcgill.ca/~orm/rotcal.html54 http://acm.tzc.edu.cn/acmhome/welcome.do?method=index55 http://www.rqnoj.cn/56 http://acm.dlut.edu.cn/57 http://acm.zjut.edu.cn/58 http://p

Interview with the founder of Python 2: the origins, characteristics, and future of Python

Chris DiBona have strict blank format requirements for ABC?Guido van rosum: ABC also requires forced indentation.Leo Laporte: I think this is what many people complain about. I don't care about it. Are you aware of this problem?Guido van rosum: I'm not sure what you said is always a problem, and I don't agree with what you said. In most cases, this is a convenient excuse for people not planning to learn python. If you ignore this, you will find that this indent requirement is pleasant.Leo Lapor

Use FFMPEG to convert the file format and FFMPEG parameter description

) -Qmax Q maximum video Quantization Scale (VBR) -Maximum deviation between qdiff Q quantization scales (VBR) -Qblur: Video quantization Scaling (VBR) -Qcomp compression video Quantization Scale compression (VBR) -The initial complexity of rc_init_cplx complexity Encoding -B _qfactor: QP factor between P and B frames -The QP factor of I _qfactor between P and I frames -QP deviation of B _qoffset offset between P and B frames -QP deviation of I _qoffset offset between P and I frames -Rc_eq equat

Image processing-grayscale processing (black/white effect)

most reasonable.The following programs use wR = 70%, WG = 20%, WB = 10%, and the results are better. 3. Implementation Code: 1 Public Enum algorithmstype 2 { 3 maxvalue, // Maximum Value Method 4 averagevalue, // Average Method 5 weightaverage // weighted average method 6} Public static image gray (image IMG, algorithmstype algo) { Int width = IMG. width; Int Height = IMG. height; Bitmap BMP = new Bitmap (IMG ); // Set instance bitmapdata Informat

Host type of iptables Firewall

an exclamation mark indicates that if the number of connections is less than n, what should you do)Set only two connections per person to access the web server (the production environment depends on actual needs) 1 iptables -A INPUT -d 192.168.0.108 -p tcp --dport 80 -m connlimit --connlimit-above 2 -j ACCEPT -M limit settings-- Limit: sets the number of connections allowed in a specified time period.-- Limit-burst: set the number of connections allowed at the same time for th

Understand phpHash functions and enhance password security

code is as follows: // Assume this was pulled from the database $ Hash = '$ 2a $10 $ dfda807d832b094184faeu1elwhtR2Xhtuvs3R9J1nfRGBCudCCzC '; // Assume this is the password the user entered to log back in $ Password = "verysecret "; If (check_password ($ hash, $ password )){ Echo "Access Granted! "; } Else { Echo "Access Denied! "; } Function check_password ($ hash, $ password ){ // First 29 characters include algorithm, cost and salt // Let's call it $ full_salt $ Full_salt = substr ($ hash, 0

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