fast maths routines for delphi/BCB
标签： routines delphi maths fast
上传时间： 2014-07-29
上传用户：xg262122
VC与西门子PLC自由口通讯例程源码-VC and Siemens PLC source free port communication routines
标签： SCommtest
上传时间： 2013-06-14
上传用户：youth25
第五章 Keil C51库函数参考 C51强大功能及其高效率的重要体现之一在于其丰富的可直接调用的库函数，多使用库函数使程序代码简单，结构清晰，易于调试和维护，下面介绍C51的库函数系统。 1. 第一节 本征库函数(intrinsic routines)和非本征证库函数 C51提供的本征函数是指编译时直接将固定的代码插入当前行，而不是用ACALL和LCALL语句来实现，这样就大大提供了函数访问的效率，而非本征函数则必须由ACALL及LCALL调用。 C51的本征库函数只有9个，数目虽少，但都非常有用，列如下： _crol_,_cror_：将char型变量循环向左(右)移动指定位数后返回 _iror_,_irol_：将int型变量循环向左(右)移动指定位数后返回 _lrol_,_lror_：将long型变量循环向左(右)移动指定位数后返回 _nop_： 相当于插入NOP _testbit_： 相当于JBC bitvar测试该位变量并跳转同时清除。 _chkfloat_： 测试并返回源点数状态。 使用时，必须包含#inclucle 一行。 如不说明，下面谈到的库函数均指非本征库函数
上传时间： 2013-10-19
上传用户：1184599859
FeaturesThe following standard features are provided.• Choice of RTOS scheduling policy1. Pre-emptive:Always runs the highest available task. Tasks of identical priorityshare CPU time (fully pre-emptive with round robin time slicing).2. Cooperative:Context switches only occur if a task blocks, or explicitly callstaskYIELD().• Co-routines (light weight tasks that utilise very little RAM).• Message queues• Semaphores [via macros]• Trace visualisation ability (requires more RAM)• Majority of source code common to all supported development tools• Wide range of ports and examples
上传时间： 2013-10-13
上传用户：13162218709
The C500 microcontroller family usually provides only one on-chip synchronous serialchannel (SSC). If a second SSC is required, an emulation of the missing interface mayhelp to avoid an external hardware solution with additional electronic components.The solution presented in this paper and in the attached source files emulates the mostimportant SSC functions by using optimized SW routines with a performance up to 25KBaud in Slave Mode with half duplex transmission and an overhead less than 60% atSAB C513 with 12 MHz. Due to the implementation in C this performance is not the limitof the chip. A pure implementation in assembler will result in a strong reduction of theCPU load and therefore increase the maximum speed of the interface. In addition,microcontrollers like the SAB C505 will speed up the interface by a factor of two becauseof an optimized architecture compared with the SAB C513.Moreover, this solution lays stress on using as few on-chip hardware resources aspossible. A more excessive consumption of those resources will result in a highermaximum speed of the emulated interface.Due to the restricted performance of an 8 bit microcontroller a pin compatible solution isprovided only; the internal register based programming interface is replaced by a set ofsubroutine calls.The attached source files also contain a test shell, which demonstrates how to exchangeinformation between an on-chip HW-SSC and the emulated SW-SSC via 5 external wiresin different operation modes. It is based on the SAB C513 (Siemens 8 bit microcontroller).A table with load measurements is presented to give an indication for the fraction of CPUperformance required by software for emulating the SSC.
标签： synchronous Emulating serial
上传时间： 2014-01-31
上传用户：z1191176801
The solution presented in this paper and in the attached source files emulates the mostimportant SSC functions by using SW routines implemented in C. The code is focused onthe SAB C513, but will fit to all C500 derivatives.Beyond the low level software drivers a test shell is delivered. This shell allows a quicktest of the software drivers by an emulator or a starter kit demo board.
上传时间： 2013-11-24
上传用户：363186
The P90CL301 is a highly integrated 16/32 bit micro-controller especially suitable for applications requiring lowvoltage and low power consumption. It is fully software compatible with the 68000. Furthermore, it provides bothstandard as well as advanced peripheral functions on-chip.One of these peripheral functions is the I2C bus. This report describes worked-out driver software (written in C) toprogram the P90CL301 I2C interface. It also contains interface software routines offering the user a quick start inwriting a complete I2C system application.
上传时间： 2014-01-06
上传用户：气温达上千万的
This application note demonstrates how to write an Inter Integrated Circuit bus driver (I2C) for the XA-S3 16-bitMicrocontroller from Philips Semiconductors.Not only the driver software is given. This note also contains a set of (example) interface routines and a smalldemo application program. All together it offers the user a quick start in writing a complete I2C system applicationwith the PXAS3x.The driver routines support interrupt driven single master transfers. Furthermore, the routines are suitable foruse in conjunction with real time operating systems.
上传时间： 2013-11-02
上传用户：zw380105939
The XA-S3 is a member of Philips Semiconductors’ XA (eXtended Architecture) family of high performance 16-bit single-chip Microcontrollers. The XA-S3 combines many powerful peripherals on one chip. Therefore, it is suited for general multipurpose high performance embedded control functions.One of the on-chip peripherals is the I2C bus interface. This report describes worked-out driver software (written in C) to program / use the I2C interface of the XA-S3. The driver software, together with a demo program and interface software routines offer the user a quick start in writing a complete I2C - XAS3 system application.
上传时间： 2013-11-10
上传用户：liaofamous
Presents short and simple I2C software routines that support onlyslave (rather than master or master & slave) operation and an ASMdemonstration program. The slave-only software in this app notecomplements the master mode software presented in AN464, Usingthe 87LPC76X microcontroller as an I2C bus master.
上传时间： 2013-11-22
上传用户：1039312764
