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In stm32, there are four clock sources: Hsi, HSE, LSI, LSE, And a pll output 1,HSIIt is a high-speed internal clock, RC oscillator, and the frequency is 8 MHz. 2,HSEIt is a high-speed external clock, which can be connected to a Z/Ceramic Resonator or an external clock source. The frequency range is 4 MHz ~ 16 MHz. 3,LSIIt is a low-speed internal clock, RC oscillator, and the frequency is 40 kHz. 4,LSEIt is a Z crystal with a low-speed external clo

can write more effective articles. But if you are not familiar with the next wave of search trends-content quality scores and relevance-you need to first understand some search engine technologies.As the world's leading search engine, Google has over 100 algorithms. PageRank is a complex voting system. Another important algorithm has been disclosed for some time, but has not been adopted by the majority of website administrators. It is Latent Semantic Indexing ). Context is a popular

power consumption. With transistors, the structure of electronic circuits is greatly improved, making it easier to make high-speed computers. Computer of the third generation computer (1965-1971) The mid 1960s, small and medium scale integrated circuit computer(2 photos)With the development of semiconductor technology, integrated circuits have been successfully manufactured. Small and medium-sized integrated circuits become the main components of the computer, the main memory also gradually tra

(OVS agent or Linux Bridge agent) is started on the compute and network nodes, it creates various Bridge types on the nodes based on various configurations. Taking OVS Agent as an example,(1) Create Intergration brige (default is Br-int), if enable_tunneling = False, create tunnel bridge (default is Br-tun).(2) According to Bridge_mappings, configure the pre-created OVS bridge for each VLAN and physical network interface used by Flat networks.(3) All the VIF of the virtual machine are connected

obtain new data for the NIC, and how to store a data.is also responsible for solving a very magical problem: how to convert the various instructions to 0 and 1, and the results of the operation. Everything can be counted.Imagine a sound that can digitize its frequency to 0 and 1, store it up, play it by the CPU in a little bit of time, and drive the sound to play. (electrical signals to go through the CPU, bus, audio output, sound)An image, each pixel of it can be stored in RGB, writte

In the article "linux.chinaitlab.com/administer/777741.html" target = _ blank> show you a variety of linux I) ", we will focus on the Firewall Application Linux-IPCop and m0n0wall. In this article, I will mainly introduce OpenFiler for SAN/NAS storage applications and Ubuntu Studio for music creation. This will be two completely different application fields. OpenFiler OpenFiler is a SAN/NAS Application Based on rPath Linux. According to its creator, OpenFiler first originated from Fedora Linux,

In the previous article, we introduced the potential semantic index (LSI). Today we will introduce the peak of hyperchain analysis:HillTopAlgorithmAs one of the core ranking algorithms of Google, there is a lot of literature on the Internet. This article focuses on the analysis of the original algorithm, without considering too many complex factors, so that you can better understand the nature of the algorithm. HillTop algorithms combine PageRank, HIT

From the perspective of clock source, there are two types of external clock (E) and internal clock (I ).From the perspective of clock rate, there are two types of high-speed clock (HS) and low-speed clock (LS ).In combination, there are four clock types: HSE, his, LSE, and LSI. Why is there such a complicated clock configuration mainly because of two factors: system performance and power consumption. A single clock may cause excess performance and hig

the location is selected by itself. Click Next. Because Linux does not require a high level of hardware, it is similar to running 98 or XP. Then choose the default 1 to do so. Next. Apart, allocate 1G of memory. Click Next. Network type selection, select "Network Address translation Nat". Next. Use the recommended "LSI Logic". Click Next. Use the recommended "SCSI (S)". Click Next. Select Create a new virtual disk. Click Next. Select th

version), click Continue. 5. Enter the name of the virtual machine, then select the storage path and click Continue. 6. Specify the number of virtual machine CPUs and click Continue. 7. Specify the virtual machine memory and click Continue. 8. Select the network type: Use bridged network and click Continue.9. Select the I/O Controller type: LSI logic, click Continue. This means that it is better to make the system boot compatible. 10. Select the dis

Under Ubuntu, you can manage hardware disk arrays by installing the LSI MegaRAID megacli command line tool. The specific installation steps are as follows.1. Add MegaRAID Source:Modify/etc/apt/sources.list to add at the endDeb Http://hwraid.le-vert.net/ubuntu Precise MainThen execute:Apt-get UpdateApt-get Install MEGACLI megactl megaraid-statusIf you are performing a GPG error, you need to add a certificate by executing the following command:Wget-o-Ht

MegaRAID is an LSI command-line RAID management tool, we used to configure the raid through the Web page to configure, the steps are cumbersome, and the configuration will need to restart the operating system. The MegaRAID tool allows us to configure management raid at the command line, which is highly efficient and very awesome to use. This approach is a dream dimple for children's shoes, which are accustomed to GUI style. :-)。 command line, you can

choose to bridge the network,This network mode can be imagined as a virtual machine right next to your actual PC, which is within the same LAN650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/59/B7/wKiom1Tcbw7wkkI5AAGm3hcKG4I502.jpg "title=" Qq20150212171000.png "alt=" Wkiom1tcbw7wkki5aagm3hckg4i502.jpg "/>I/O Controller type Default, LSI Logic, next;Virtual disk type default, SCSI, next;Disk selection, creating a new virtual disk, next;Disk

Common commands and Linux common senseVersion number analysis2.6.32-2202 Major Version number6 minor version number even for stable version odd for dev version32 Derived version number220 modification TimesRoot Super Admin home directory equivalent to Windows-My DocumentsHome Common User Home directoryShow Machine Name#hostnameLSPCI: Viewing PCI informationLSUSB: viewing USB informationCat/proc/cpuinfo: Viewing CPU informationFree: View memoryDMESG: View drivers for all devices in the systemSpli

1. Open the VM12 software and create a new virtual machine.Click Next.By default, click Next.Select Install operating system later (S). This is basically the default. Click Next.This is where the client operating system chooses Linux (L). Version Select Red Hat Enterprise Linux 6 64 bit on it. Click Next.This is the default, click Next.This will be the default, click Next.The default 2G is available, click Next.The default option is to use network address translation (NAT) (E), click Next.Select

2048M. Next step Choose the network type,NAT, so as long as the host can surf the Internet, the virtual machine can also access the Internet, but only one-way access to the LAN. For the network connection type, this article is very good, "the difference between three types of network connections in VMware," (http://www.cnblogs.com/rainman/archive/2013/05/06/3063925.html). input / output controller type, default LSI Logic(L), next Disk type,SC

MethodMethod 1: By viewing/sys/block/sda/queue/rotationalWith Cat/sys/block/sda/queue/rotational, the return value of 0 is SSD, and 1 is HDD.Method 2: View by LSSCSILsscsi-list SCSI devices (or hosts) and their attributesInstanceHDD[[email protected] thatsit]# cat/sys/block/sda/queue/rotational1[[email protected] thatsit]# lsscsi[0:0:32:0] Enclosu DP bp12g+ 1.00-[0:2:0:0] Disk DELL PERC H310 2.12/dev/sda[[email protected] thatsit]#Ssds[[email protected] thatsit]# cat/sys/block/sda/queue/rotation

not enough 11? It is very likely that the at command is not found, it is estimated that the character is wrong, to verify that notify is not finished, continue to the next notify. Next use SECURECRT software, test the higher baud rate, see is reply what? The 9600 baud rate is problematic with the internal crystal oscillator when using STM32. However, if the baud rate is biased, then why only the 5th notify have problems? So the idea was blocked at the time.4. There may be a situation in which t

) ADAPTEC39320A (EMU) 39320A (x64) SCSI u320 LSI u320_win2k No drive No drive Perc320/dc PERC320/DC Win2K Perc320/dc 　 Perc3/di Perc3/di_win2k No drive No drive Perc3/dcl Perc3/4_win2k No drive No drive Perc3/sc Perc3/4_win2k No drive No drive Perc3/qc Perc3/4_win2k No drive No drive Perc3/

device presents a logical sector size this is smaller than The physical sector size. Aligning to a physical sector (or optimal I/O) size boundary is recommended, or performance could be impacted. Warning:dos-compatible mode is deprecated. It ' s strongly recommended to Switch off "mode" (Command ' C ') and change display units to Sectors (Command ' u '). Command (M for help): P disk/dev/sda:2997.9 GB, 2997920727040 bytes 255 heads, Sectors/track, 364476 cylinders Units = Cylinders o