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This file contains a design example using the GPIO driver(XGpio) and hardware
* device. It onlyuses a channel 1 of a GPIO device.
*
* This example can be ran on the Xilinx ML300 boardusing the Prototype Pins &
* LEDs of theboard connected to the GPIO.
这个文件包含了一个设计实例使用GPIO驱动(XGpio)和硬件设备。它只使用一个通道1的GPIO设备。* *这个例子可以跑在Xilinx ML300，板连接到GPIO的led。
This file contains a design example using the GPIO driver(XGpio) in an
* interrupt driven mode of operation. This example doesassume that there is
* an interrupt controller in the hardware system and theGPIO device is
* connected to the interrupt controller.
*
* This example is designed to work on the XilinxML300 board using the PowerPC
* 405 processor present in the VirtexIIPro device. Theexample uses the
* interrupt capability of the GPIO to detect push buttonpresses and control the
* LEDs on the board. When a button is pressed it will turnon and LED located
* closest to it. When the button is released it will turnoff the LED.
* This examples uses two channels of a GPIO such that it isnecessary to have
* dual channel capabilities.
*
* The buttons and LEDs are on 2 seperate channels ofthe GPIO so that interrupts
* are not caused when the LEDs are turned on and off.
*
* At the start of execution all LEDs will be turned on,then each one by itself,
* and then all on again followed by all turned off. Afterthis sequence, button
* presses are processed by interrupts.
*
* The following snippet from the UCF file of the hardwarebuild indicates the
* way the GPIOchannels are connected to the ML300 for the LEDs and buttons.
该文件包含使用GPIO驱动程序（XGpio）在一个设计实例
*操作中断驱动模式。这个例子并假设有*在硬件系统中的中断控制器和GPIO器件是*连接到中断控制器。*本示例是使用的PowerPC在赛灵思ML300板工作* 405处理器中存在VirtexIIPro设备。该示例使用*同时GPIO中断能力检测按钮按下和控制*在电路板上的LED。当按下一个按钮，它会打开并位于LED*最接近它。当松开按钮，它会关闭LED。*本实施例采用了两个信道的GPIO使得它必须有*双通道功能。*该按钮和指示灯都在GPIO的2个独立的渠道，使中断*不当LED被接通和断开而引起的。*在开始执行时所有LED将被打开，那么每一个本身，*然后将所有再然后是所有关闭。后该序列中，按钮*印刷机被中断处理。*从硬件构建的UCF文件下面的代码片段指示*方式将GPIO通道连接到ML300用于LED和按钮。
This file contains a design example using the GPIO driver(XGpio) in an
* interrupt driven mode of operation. This example doesassume that there is
* an interrupt controller in the hardware system and theGPIO device is
* connected to the interrupt controller.
*
* This file is used by the TestAppGen utility to include asimplified test for
* gpio interrupts.
* The buttons and LEDs are on 2 seperate channels ofthe GPIO so that interrupts
* are notcaused when the LEDs are turned on and off.
该文件包含使用GPIO驱动程序（XGpio）在一个设计实例*操作中断驱动模式。这个例子并假设有*在硬件系统中有中断控制器并且GPIO器件是连接到中断控制器的。
**本文件所使用的TestAppGen，包括简化测试* GPIO中断。
*该按钮和指示灯都在GPIO的2个独立的通道，使中断*不当LED被接通和断开而引起的。
This file contains a design example using the GeneralPurpose I/O (GPIO) low
* level driver and hardware device. It only uses a channel1 of a GPIO device.
这个文件包含了一个设计实例使用通用I /O(GPIO)低*驱动程序和硬件设备水平。它只使用一个通道1的GPIO设备。
* This file contains a example for using GPIO hardware anddriver.
* This example assumes that there is a UART Device or STDIODevice in the
* hardwaresystem.
*这个文件包含一个示例使用GPIO的硬件和驱动程序。*这个例子假设有一个UART设备或STDIO设备的硬件系统。
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原文地址：http://blog.csdn.net/kobesdu/article/details/47302701
