Test process 1 of FFT operation using FPU + DSP library of iisf4, stm32f4fpu
Test environment: Microcontroller: STM32F407ZGT6 IDE: keil5.255.0.0 Firmware Library version: STM32F4xx_DSP_StdPeriph_Lib_V1.4.0
Part 1: UseSource code fileUse the void arm_cfft_radix4_f32 (const arm_cfft_radix4_instance_f32 * S, float32_t * pSrc) function to perform the FFT operation.
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performance is dozens or even hundreds of times higher than that of M0/m3. However, to fully utilize the mathematical performance of FPU, you still need some small settings:
1. compile control option: although the corresponding code is added to the system_stm32f4xxx.c file of the stm32f4xx Firmware Library, but it is not in the STM32F4-Discovery routine used for user evaluation, so when mdk4.23 writes a fl
How to enable 1.3 mpu6050 (Large End) and M4 FPU
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The most recent time is the I2C of stm32. I know that the I2C of stm32 is not easy to use, because I have used analog I2C, and I have also written the AVR I2C, that is, the twi hardware driver, so I want to try writing stm32 hardware I2C... In order to avoid the trouble caused by the
Intel x87 FPU is designed for scalar floating point computing. It can compute single precision Floating Point (32 bits), Double Precision Floating Point (64 bits), and extended Double Precision Floating Point (80 bits, and complies with the ieee754 standard.
X87 FPU can work in 32-bit compatibility mode and 64-Bit mode. In both cases, the number of FPU data regi
Release date:Updated on:
Affected Systems:Linux kernel 3.4.76Linux kernel 3.12.7Linux kernel 3.10.26Description:--------------------------------------------------------------------------------Bugtraq id: 64781
Linux Kernel is the Kernel of the Linux operating system.
After Linux Kernel 3.4.76, 3.10.26, 3.12.7 handles FXSAVE leaks, the FPU suspended in the "restore_fpu_checking ()" function (arch/x86/include/asm/fp
The eldest brother encountered a problem, there is a pile of floating-point arithmetic, separate write on the right, unity from the overflow.Because the defined function returns float, the other place declares that void is wrong, so that error
This article describes a way to add a dynamic library and a static library to a pro file by using Qtcreator under Windows systems:
1, add dynamic library (directly add dynamic library file. dll, non-subproject)
The method of creating a dynamic library through Qtcreator is
"Dynamic Library" and "Static Library" in Linux system the suffix of the/etc/ld.so.conf dynamic library is *.so the suffix of the static library is libxxx.a ldconfig directory nameReprinted from: http://blog.chinaunix.net/uid-23069658-id-3142046.htmlToday we mainly say that the Linux system is based on dynamic librarie
Windows library creation and use: static library + dynamic library, windows static libraryCreate and use windows libraries: static libraries + dynamic libraries
I. creation and use of static databases 1. Creation of static databases
(1) first create a project test. The test code is as follows:
1) test. h
Void test_print ();
2) test. cpp
#
Creation and calling of Qt shared library (Dynamic Link Library) and static Link Library, and qt static Link Library
Qt Creator compiler, win7 64-bit System Environment
1. Create a shared library:
Create a file or project-> select Libra
Similar to Baidu Library website system, library website system source code, library website construction and development, library website construction
Professional custom imitation Baidu Library website system, imitation douding Network website, imitation daoke Baba website
Use vs2012 as the standard. From: http://technet.microsoft.com/zh-cn/library/w4zd66ye, there are changes.
1. MFC static library (. Lib)
The MFC static library uses the following naming conventions:
UafxCWD. Lib.
The library naming conventions are described as follows:
Description
Value and meaning
Http://hi.baidu.com/zhengshaohua1987/blog/item/c99262eefe1e04ebb2fb95ee.html
I. IntroductionGenerally, the link to the function library is completed during the compilation period (compile time. All related object files and libraries are linked to form an executable file ). When the program is running, it has nothing to do with the function library, because all the required functions have been copied to the
I. Introduction
Generally, the link to the function library is completed during the compilation period (compile time. All related object files and libraries are linked to form an executable file ). When the program is running, it has nothing to do with the function library, because all the required functions have been copied to their own doors. Therefore, these function libraries are called static libaray
When writing a C language program, we often encounter many repeated or commonly used parts. If we re-write each time, it is acceptable, but this will greatly reduce the work efficiency, it also affects code readability and is not conducive to code maintenance in the future. We can make them into corresponding function functions. It will be convenient to call them directly during use, and we can also upgrade the functions later.
For example, if I want to exchange the values of two variables multi
1. Is the C Runtime Library the same thing as the C function library (such as stdio. h and stdlib. h?2. In the technical reference books, I often say "Microsoft C Runtime Library". Is the C Runtime Library a language database or an operating system database? Do other operating systems, such as Unix/Linux, have C Runtim
Function objects and High-Order programming (function objects and higher-order programming) boost. Bind
BIND is a generalization of the standard library binder (bind1st and bind2nd. This library supports binding any behavior similar to a function, function pointer, function object, or member function pointer using a unified syntax. It also supports functional composition ). This
dynamic-link libraries (DLLs), Static link libraries (LIB), import libraries for dynamic-link libraries (lib)
At present, there are two libraries with Lib suffix, one for static link library (static libary, hereinafter referred to as "still Library"), the other is the import library for dynamic Connection libraries (DLL, hereinafter referred to as "Dynamic
Differences between Linux static library and dynamic library and creation (transfer) of dynamic library)
I. Introduction
Generally, the link to the function library is completed during the compilation period (compile time. All related object files and libraries are linked to form an executable file ). When the program
Tags: mysql master slave mysql main slave from the library from MySQLIn reality, MySQL is more common is a master multi-slave, and in the main library The problem is that it needs to be raised from the library to the main library, but in fact this operation is very cumbersome, basically to all from the
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