165 lines
5.6 KiB
C
Executable file
165 lines
5.6 KiB
C
Executable file
/******************************************************************************
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*
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* (c) Copyright 2002-2013 Xilinx, Inc. All rights reserved.
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*
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* This file contains confidential and proprietary information of Xilinx, Inc.
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* and is protected under U.S. and international copyright and other
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* intellectual property laws.
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*
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* DISCLAIMER
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* This disclaimer is not a license and does not grant any rights to the
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* materials distributed herewith. Except as otherwise provided in a valid
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* license issued to you by Xilinx, and to the maximum extent permitted by
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* applicable law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL
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* FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS,
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* IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
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* MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE;
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* and (2) Xilinx shall not be liable (whether in contract or tort, including
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* negligence, or under any other theory of liability) for any loss or damage
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* of any kind or nature related to, arising under or in connection with these
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* materials, including for any direct, or any indirect, special, incidental,
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* or consequential loss or damage (including loss of data, profits, goodwill,
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* or any type of loss or damage suffered as a result of any action brought by
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* a third party) even if such damage or loss was reasonably foreseeable or
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* Xilinx had been advised of the possibility of the same.
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*
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* CRITICAL APPLICATIONS
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* Xilinx products are not designed or intended to be fail-safe, or for use in
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* any application requiring fail-safe performance, such as life-support or
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* safety devices or systems, Class III medical devices, nuclear facilities,
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* applications related to the deployment of airbags, or any other applications
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* that could lead to death, personal injury, or severe property or
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* environmental damage (individually and collectively, "Critical
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* Applications"). Customer assumes the sole risk and liability of any use of
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* Xilinx products in Critical Applications, subject only to applicable laws
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* and regulations governing limitations on product liability.
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*
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* THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE
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* AT ALL TIMES.
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*
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******************************************************************************/
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/*****************************************************************************/
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/**
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* @file xgpio_low_level_example.c
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*
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* This file contains a design example using the General Purpose I/O (GPIO) low
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* level driver and hardware device. It only uses a channel 1 of a GPIO device.
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*
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* <pre>
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* MODIFICATION HISTORY:
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*
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* Ver Who Date Changes
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* ----- ---- -------- -----------------------------------------------
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* 1.00b jhl 04/29/02 First release
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* 2.00a jhl 12/30/02 Addition of dual channel capability
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* 2.00a sv 04/18/05 Minor changes to comply to Doxygen and coding guidelines
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* 3.00a ktn 11/21/09 Removed the macros XGpio_mSetDataDirection,
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* XGpio_mGetDataReg and XGpio_mSetDataReg. Users
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* should use XGpio_WriteReg/XGpio_ReadReg to achieve the
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* same functionality.
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* </pre>
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*
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******************************************************************************/
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/***************************** Include Files *********************************/
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#include "xparameters.h"
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#include "xgpio_l.h"
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/************************** Constant Definitions *****************************/
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#define LED 0x01 /* Assumes bit 0 of GPIO is connected to an LED */
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/*
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* The following constant maps to the Base address of the hardware
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* instances that was created in the EDK XPS system.
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*/
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#define GPIO_REG_BASEADDR XPAR_LEDS_POSITIONS_BASEADDR
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/*
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* The following constant is used to wait after an LED is turned on to make
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* sure that it is visible to the human eye. This constant might need to be
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* tuned for faster or slower processor speeds.
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*/
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#define LED_DELAY 1000000
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/*
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* The following constant is used to determine which channel of the GPIO is
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* used for the LED if there are 2 channels supported.
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*/
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#define LED_CHANNEL 1
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/**************************** Type Definitions *******************************/
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/***************** Macros (Inline Functions) Definitions *********************/
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/************************** Function Prototypes ******************************/
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/************************** Variable Definitions *****************************/
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/*****************************************************************************/
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/**
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* The purpose of this function is to illustrate how to use the GPIO low level
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* driver to turn on and off an LED.
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*
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* @param None
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*
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* @return Always 0
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*
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* @note
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* The main function is returning an integer to prevent compiler warnings.
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*
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******************************************************************************/
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int main()
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{
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u32 Data;
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volatile int Delay;
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/*
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* Set the direction for all signals to be inputs except the LED output
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*/
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XGpio_WriteReg((GPIO_REG_BASEADDR),
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((LED_CHANNEL - 1) * XGPIO_CHAN_OFFSET) +
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XGPIO_TRI_OFFSET, (~LED));
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/* Loop forever blinking the LED */
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while (1) {
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/*
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* Read the state of the data so that only the LED state can be
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* modified
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*/
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Data = XGpio_ReadReg(GPIO_REG_BASEADDR,
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((LED_CHANNEL - 1) * XGPIO_CHAN_OFFSET) +
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XGPIO_DATA_OFFSET);
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/* Set the LED to the opposite state such that it blinks */
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if (Data & LED) {
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XGpio_WriteReg((GPIO_REG_BASEADDR),
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((LED_CHANNEL - 1) * XGPIO_CHAN_OFFSET) +
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XGPIO_DATA_OFFSET, Data & ~LED);
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} else {
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XGpio_WriteReg((GPIO_REG_BASEADDR),
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((LED_CHANNEL - 1) * XGPIO_CHAN_OFFSET) +
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XGPIO_DATA_OFFSET, Data | LED);
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}
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/* Wait a small amount of time so that the LED is visible */
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for (Delay = 0; Delay < LED_DELAY; Delay++);
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}
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return 0;
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}
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