2c8f92039d
Added initial support Xilinx Embedded Software. Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
155 lines
5 KiB
C
Executable file
155 lines
5 KiB
C
Executable file
/******************************************************************************
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*
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* Copyright (C) 2002 - 2014 Xilinx, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Use of the Software is limited solely to applications:
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* (a) running on a Xilinx device, or
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* (b) that interact with a Xilinx device through a bus or interconnect.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* XILINX CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of the Xilinx shall not be used
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* in advertising or otherwise to promote the sale, use or other dealings in
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* this Software without prior written authorization from Xilinx.
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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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