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Polling

轮询(Polling)是一种CPU决策如何提供周边设备服务的方式,又称“程控输入输出”(Programmed I/O)。轮询法的概念是:由CPU定时发出询问,依序询问每一个周边设备是否需要其服务,有即给予服务,服务结束后再问下一个周边,接着不断周而复始。
  • Introduction to GPS ToolKit Pro 1.0 GPS ToolKit Pro is an ActiveX object that makes it easy to add

    Introduction to GPS ToolKit Pro 1.0 GPS ToolKit Pro is an ActiveX object that makes it easy to add GPS support to any Visual Basic, Visual C++, Delphi, Excel, or scripting project that supports ActiveX controls. GPS data (including lat/lon, speed, course, altitude, and dozens of other datasets) can be accessed through GPS ToolKit s properties, and GPS ToolKit s multithreaded event-based architecture notifies your application when data has been updated, saving you from having to write messy Polling routines.

    标签: ToolKit Introduction GPS Pro

    上传时间: 2015-04-28

    上传用户:zhuoying119

  • upsd_flash.c These functions are provided to help you develop your initial code. They are optim

    upsd_flash.c These functions are provided to help you develop your initial code. They are optimized for speed rather that size. As a result, you will see very few nested function calls. If speed is not critical, you can use function calls for common tasks (like dat Polling after writing a byte to Flash) The penalty is the extra processor time to make the nested calls.

    标签: upsd_flash functions are provided

    上传时间: 2013-12-22

    上传用户:Andy123456

  • This example provides a description of how to set a communication with the bxCAN in loopback mode:

    This example provides a description of how to set a communication with the bxCAN in loopback mode: - transmit and receive a standard data frame by Polling at 100Kbit/S - transmit and receive an extended data frame with interrupt at 500Kbit/S - lit some LEDs depending of the program succeed or not

    标签: communication description provides loopback

    上传时间: 2016-04-24

    上传用户:frank1234

  • Name Function --- --- --- --- --- --- Check_SST_39VF160 Check manufacturer and device ID CFI_Que

    Name Function --- --- --- --- --- --- Check_SST_39VF160 Check manufacturer and device ID CFI_Query CFI Query Entry/Exit command sequence Erase_Entire_Chip Erase the contents of the entire chip Erase_One_Sector Erase a sector of 2048 word Erase_One_Block Erase a block of 32K word Program_One_Word Alter data in one word Program_One_Sector Alter data in 2048 word sector Program_One_Block Alter data in 32K word block Check_Toggle_Ready End of internal program or erase detection using Toggle bit Check_Data_Polling End of internal program or erase detection using Data# Polling

    标签: manufacturer Check_SST Function CFI_Que

    上传时间: 2013-12-20

    上传用户:徐孺

  • SX1278扩频技术433M无线模块

    APC340是高度集成低功耗双工无线数据传输模块,其嵌入高速低功耗单片机和高性能扩频射频芯片SX1276/8,同时采用高效的循环交织纠检错编码,抗干扰和灵敏度均处于行业最领先水平,APC340提供了多个频道选择,可在线修改串口速率,收发频率,发射功率,射频速率等各种参数。APC340工作电压为2.1-3.6V,可定制3.5-5.5V工作电压,在接收状态下仅消耗13mA,APC340有四种工作模式,各模式之间可任意切换,在1SEC周期轮询唤醒省电模式(Polling mode)F,接收仅仅消耗几+uA,一节3.6V/3.6AH时的锂亚电池可工作数年,非常适合电池供电的系统。应用:无线水气热表抄表极远距离数据通讯无线传感器网络无线自动化数据采集野外数据遥控、遥测各种变送器,流量计智能仪表楼宇小区自动化与安防矿山石油设备控制通讯环境、节能、温度监测电气电力设备

    标签: sx1278 扩频技术 无线模块

    上传时间: 2022-06-19

    上传用户:pagedown