The projection method of Google map slices and the index mechanism of tiles1. Map projectionGoogle Maps uses a web Mercator projection (such as), in order to conveniently ignore the regions with large polar deformation, the world map is made into a square with a side length equal to the equator circumference (the equator length is 6378137 meters), the origin in the center of the square, that is, longitude and latitude (0,0). The value of the x, Y coordinates of the Web Mercator projection is: [
The TAP controller is a synchronous finite state machine that respondsTo changes at the TMS and TCK signals of the TAP and controls the sequence of operations of the circuitry.TAP Controller State diagram* Yellow * Status can be repeated, other states can only occur once, the next TCK rising Edge will switch to the next state.State descriptionsResetThe test logic is disabled so, normal operation of the chip logic can continue unhindered.No matter in w
1. Preface
Test the execution time of a program, including user CPU time, system CPU time, clock time. Before the acquisition time is in the program's main function with a time function, this can only be a rough calculation of the execution of the program, can not accurately obtain other time. In reading "Apue", the book on the program Time test procedures, very formal, to provide these three time. If so, search the Internet and make a summary.
2, obtain the method
There are two ways to get i
code:3.2 Layer3.2.1 Tile LayerYou can choose the tile provider you need, but it is recommended to use Mapbox (looks pretty).3.2.2 WMS Layer3.2.3 TMS LayerLeaflet does not have explicit support for TMS services, but the tile structure is the same as the general L.tilelayer organization model, so the rendering of TMS services is almost less cumbersome.3.2.4 Access
whether the isinlist auxiliary method works as expected:
[Testfixture] public class stringhelpertests {//
Assert is a helper class in the nunit framework. It contains methods to check whether the returned values meet expectations. If the returned value is not as expected, an exception is thrown. You can immediately see the row where your test failed. For example, assert. istrue checks whether the return value of the isinlist method is true. If the returned value is false, an exception is th
should is allowed read access on the Memory.usage_in_bytes file by default.Then the situation should be reported as a bug.You can generate a local policy module to allow this access.DoAllow this access for now by executing:# ausearch-c ' Cat '--raw | Audit2allow-m My-cat# semodule-i MY-CAT.PPMore information:Source Environment (context) SYSTEM_U:SYSTEM_R:ZABBIX_AGENT_T:S0Target Environment SYSTEM_U:OBJECT_R:CGROUP_T:S0Target object memory.usage_in_bytes [file]SOURCE CatSource Path/usr/bin/catPo
Detailed meaning of JTAG!
JTAGIt is short for the header Letter "Joint Test Action Group (Joint Test behavior Organization)", which was founded in 1985, it is a PCB and IC testing standard developed by several major electronic manufacturers. JTAG was recommended to be approved by IEEE as IEEE1149.1-1990 Test Access Port and boundary scan structure standard in 1990. This Standard specifies the hardware and software required for border scanning. Since 1990After the annual approval, IEEE supplement
developed the standard IEEE Std 1149.1 for standard test port and boundary scan, which is the JTAG interface protocol. The JTAG interface uses four signal lines: TCK, TDI, TDO, and TMS to provide connectivity tests for various pins of the complex chip in serial mode, the progress also enables the configuration of the programmable chip and debugging of the processor chip. Download cable is a cheap tool that uses the parallel port of a computer to impl
The Linux time function is in the time.h header file.1. header fileThe time-related header files are as follows:Time.hSys/time.hSys/times.hSys/timeb.hSys/timex.hTime.h is the header file for the C standard library, and the rest of Sys starts with the Linux system's own header files./usr/include/time.h defines the commonly used time functions.To view these files in the/usr/include/sys directory:Sys/time.h defines the time functions of the TIMEZONE structure and the Linux system.SYS/TIMES.H define
For several days did not write a blog, recently to test, have C language. Originally prepared to deal with the exam, casually learn, and then prepare for the next semester with C to learn the data structure and algorithm, but, watched some video, ready to enter the pit C/s .... I learned nearly a semester of C #, so give up feeling or some small reluctant to ... But technology is common, and it's not a waste of time.Then post the code:1 intnum[Ten];2 time_t
. When prompted * For * The Source System of database copy ?, Make sure that the of the production system is selected. Press the checkmark button to continue.5. When prompted change originals from PRD to qua ?, Press the Yes button6. When prompted Delete TMS configuration ?, Press the Yes button7. When prompted delete old TMS configuration ?, Press the Yes button8. When prompted delete old versions of trans
, so the speed is slow, but the hardware is simple. The jlink of the second method generally carries a powerful CPU for hardware protocol conversion, which makes the hardware complex but fast.
Basic Principles of JTAG
JTAG (joint test action group) is an international standard test protocol (IEEE 1149.1 compatible ). The standard JTAG interfaces are 4-wire-TMS, tck, TDI, and TDO, which are the mode selection, clock, data input, and data output lines
Installation and configuration of the Jlink emulator and the St-link emulator. pdf工欲善其事, ... STM32 Development Environment ConstructionView AddressWhen it comes to emulators, the first thing to know about JTAG.JTAG protocolJTAG(Joint Test Action Group, Joint Test Action Group) is an International Standard test Protocol (IEEE 1149.1 compliant) and is mainly used for in-chip internal testing. Most advanced devices now support JTAG protocols such as ARM, DSP, FPGA devices, and so on. The standard J
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