rcc boots

The stm32 chip manual shows clearly that there are four clock sources: 1. HSI (Internal High-Speed clock 8 MHz) provides a clock source that supports BIT system clock 2. HSE (external high-speed clock) provides system clock and RTC clock source 3. LSE (low-speed external clock 32.768 kHz) can provide a clock source for rtc 4. LSI (low-speed internal clock) can provide the clock source for the independent watchdog First, let's analyze the database function provided by ST: I use 3.5 of the datab

To view the system clock with the oscilloscope, the system clock is output to the MCO pin.After one night, I saw the waveform.First, create an empty project. Code Comment out:; Import systeminit; Delete systeminit write RCC initialization function by yourself; LDR r0, = systeminit; Blx R0The following is a setup function that uses HSI as the system clock. If the PLL is not practical, the HSI is directly output to the MCO pin:Void my_rccinitmcohsi (voi

RCC Clock module is not good understanding, the first contact I also confused, and I really mastered it is also relatively late, is that I learned to use Register control Development Board to really understand his operating principles and laws, but why I re-revised but placed in the forefront, because this is the whole embedded foundation, beginners are more difficult , but I still want to be able to grasp the best, because the real-time is very impor

divides the clock signal (such as HSE) by frequency division or frequency doubling (PLL) to obtain the system clock. The system clock is divided by frequency to generate the clock used by the peripherals;RCC setting process: 1. Reset the RCC register to the default rcc_deinit value. 2. Enable the external high-speed clock crystal oscillator HSE rcc_hseconfig (rcc_hse_on) 3. Wait for the external high-speed

are band-enabled, such as AHB bus clocks, core clocks, various APB1 peripherals, APB2 peripherals, and so on.When a module needs to be used, the corresponding clock must be enabled first. Note that the timer multiplier, when the division of the APB is 1 o'clock, its multiplier value is 1, otherwise its multiplier value is 2.The devices connected to the APB1 (low Speed peripherals) are: Power Interface, Backup interface, CAN, USB, i2c1, I2C2, UART2, UART3, SPI2, window watchdog, Timer2, Timer3,

Reset:1. System Reset: A Systems Reset Sets all registers-their reset values except for the RTC, RTC BackupRegisters and Control/status Register, RCC_CSRReset Source view: RCC_CSROption byte loader:stm32l15xxx Flash Programming Manual (PM0062)2. Power RESET:A Power Reset sets all registers to their reset values including for the RTC domain3. RTC and Backup registers Reset:Reset Source: A software reset, triggered by setting the Rtcrst bit in the RCC_CSR registerPower Reset (BOR/POR/PDR)Clocks:Fe

As the current hand only 16MHZ of the 2520 package of SMD Crystal, 8MHZ This package does not make so small, so first with 16MHZ, so we need to modify the program-related RCC clock:1,stm32f4xx.h#define Hse_value ((uint32_t) 16000000)/*!2,system_stm32f4xx.c/* Pll_vco = (hse_value or hsi_value/pll_m) * Pll_n */#define PLL_M /* USB OTG FS, SDIO and RNG Clock = pll_vco/pllq */#define PLL_Q 7#if defined (stm32f40_41xxx)#define PLL_N 336/* SYSCLK = pll_vco/

Moc is mainly used to process signals and slots inside classes containing q_object into moc_xxx files. Because the QT signal and slot part of this is not pure C + +, it is MOC to compile the information contained in Q_object. When you do not use the signal to remove the q_object can also be compiled through. Just can't handle the signal these. RCC is mainly to convert the RC resource file into a byte stream in the form of CPP files, all the resourc

Configure two or more Tomcat boots under Linux(2012-08-14 11:59:31)reproduced Tags: gossip Category: Linux_tomcat The steps are as follows:(1) Modify the/etc/profile file. Add a set of Java environment variables, and two sets of Catalina environment variables (I did not set this step, perhaps because my tomcat is a free-to-install version of it) remember to make it effective, with the command: Source/etc/profilejava_h

built.1: Stop the Tomcat server in Eclipse. Stop2: Delete items in run on server before3: Select the Tomcat server below servers. Right click and select Open, the following prompt appears:Modify the server Locations (the default is the first one selected.) If there is no 1, 2-step operation. This option is grayed out and cannot be edited)Select the second item (Use Tomcat installation (takes ...)4: Change the following deploy path to WebApps, the default is Wptwebapps, the above server path cor

The pull-out method belongs to the repeated sampling (resampling) method, which differs from the Monte Carlo in the real matrix. It is the repeated sampling of the observed values as the mother,In order to obtain the information characteristics which are less than two of the original data cannot be explored.For example, assuming that x1,x2,..., xn as an observation from the same allocation, we would like to know the median of this allocation.Set up a group of random samples with Poisson allocati

XML version= "1.0" encoding= "Utf-8"?>DOCTYPE hibernate-configuration Public "-//hibernate/hibernate configuration DTD 3.0//en" "Http://www.hi Bernate.org/dtd/hibernate-configuration-3.0.dtd ">hibernate-configuration> session-factory> Propertyname= "Connection.driver_class">Oracle.jdbc.OracleDriver Property> Propertyname= "Connection.url">Jbdc:oracle:thin: @localhost: 1521:orcl Property> Propertyname= "Connection.username">Scott Property> Propertyname= "Connect

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, thank you very much! Iv. SummaryThis article simply introduces how to remove the charge function in the game, to enter the game play smoothly. Being able to see the length of this article is very short, in fact this hack process is very easy. Suitable for 0 basic reverse enthusiasts to get started exercise function. Read the article, remember to share a lot of proliferation!Many other things: click hereFollow the public number. Latest technical dry-feed real-time pushWatermark/2/text/ahr0cdovl

What to do if grub boots a PE boot is not normal We do grub boot PE startup is prone to garbled problems. After research, this is actually because the menu is not saved as UTF-8 encoding. So we must encode the UTF-8 format when making the menu, not ANSI. But even if we save the menu as UTF-8 format, when the error returns, there will still be garbled. This time we can modify the following sentences on the menu: (BD)/boot/usb_acc.0pe--version=5.0.

: {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} >bcdedit/set {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} drive Partition=c: #设置新引导项文件所在分区 >bcdedit/set {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} path Linux.lnx #设置启动项文件在分区中 Relative path, note that the "" before the file is required, indicating that it is located under the root directory of the partition. If you assume that the file is in C:windows , it should be changed to windowslinux. In addition, there is a space behind the path >bcdedit/displayorder {x

Some computers will display information similar to the following when they boot CLIENT MAC ADDR E0 4C B3 FC GUID FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF Dhcp..... Pxe-e51 NO DHCP or PROXYDHCP offers were RECEIVED Pxe-mof exiting PXE ROM. There

ADDR: http://msdn2.microsoft.com/en-us/library/bb419218.aspx       Overview: This article describes how ce enters the kiosk mode at startup. What is the kiosk mode? A common example is ATM. On the Internet, we can see that iepolicer.exe can be set

Turn on the computer, it's all the lights are normal, but the monitor can not show, encountered such a problem, no longer helpless, the following we look for reasons and solutions. 1, monitor VGA connection loose fall Many times the monitor

Failure diagram: Reason analysis and solution method: 1, the motherboard battery is out of power Method: Remove the COMs battery on the motherboard and wait for a few minutes before reloading it so that the motherboard coms discharge can