xgpio_selftest.c

自学ZedBoard：使用IP通过ARM PS访问FPGA（源代码）

/* $Id: xgpio_selftest.c,v 1.1.2.1 2009/11/25 07:38:16 svemula Exp $ */
/******************************************************************************
*
* (c) Copyright 2003-2009 Xilinx, Inc. All rights reserved.
*
* This file contains confidential and proprietary information of Xilinx, Inc.
* and is protected under U.S. and international copyright and other
* intellectual property laws.
*
* DISCLAIMER
* This disclaimer is not a license and does not grant any rights to the
* materials distributed herewith. Except as otherwise provided in a valid
* license issued to you by Xilinx, and to the maximum extent permitted by
* applicable law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL
* FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS,
* IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
* MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE;
* and (2) Xilinx shall not be liable (whether in contract or tort, including
* negligence, or under any other theory of liability) for any loss or damage
* of any kind or nature related to, arising under or in connection with these
* materials, including for any direct, or any indirect, special, incidental,
* or consequential loss or damage (including loss of data, profits, goodwill,
* or any type of loss or damage suffered as a result of any action brought by
* a third party) even if such damage or loss was reasonably foreseeable or
* Xilinx had been advised of the possibility of the same.
*
* CRITICAL APPLICATIONS
* Xilinx products are not designed or intended to be fail-safe, or for use in
* any application requiring fail-safe performance, such as life-support or
* safety devices or systems, Class III medical devices, nuclear facilities,
* applications related to the deployment of airbags, or any other applications
* that could lead to death, personal injury, or severe property or
* environmental damage (individually and collectively, "Critical
* Applications"). Customer assumes the sole risk and liability of any use of
* Xilinx products in Critical Applications, subject only to applicable laws
* and regulations governing limitations on product liability.
*
* THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE
* AT ALL TIMES.
*
******************************************************************************/
/*****************************************************************************/
/**
* @file xgpio_selftest.c
*
* The implementation of the XGpio driver's self test function.
* See xgpio.h for more information about the driver.
*
* @note
*
* None
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a rmm  02/04/02 First release
* 2.00a jhl  01/13/04 Addition of dual channels and interrupts.
* 2.11a mta  03/21/07 Updated to new coding style
* 3.00a sv   11/21/09 Updated to use HAL Processor APIs.
* </pre>
*
*****************************************************************************/

/***************************** Include Files ********************************/
#include "xgpio.h"

/************************** Constant Definitions ****************************/

/**************************** Type Definitions ******************************/

/***************** Macros (Inline Functions) Definitions ********************/

/************************** Variable Definitions ****************************/

/************************** Function Prototypes *****************************/


/******************************************************************************/
/**
* Run a self-test on the driver/device. This function does a minimal test
* in which the data register is read. It only does a read without any kind
* of test because the hardware has been parameterized such that it may be only
* an input such that the state of the inputs won't be known.
*
* All other hardware features of the device are not guaranteed to be in the
* hardware since they are parameterizable.
*
*
* @param	InstancePtr is a pointer to the XGpio instance to be worked on.
*		This parameter must have been previously initialized with
*		XGpio_Initialize().
*
* @return 	XST_SUCCESS always. If the GPIO device was not present in the
*		hardware a bus error could be generated. Other indicators of a
*		bus error, such as registers in bridges or buses, may be
*		necessary to determine if this function caused a bus error.
*
* @note		None.
*
******************************************************************************/
int XGpio_SelfTest(XGpio * InstancePtr)
{
	Xil_AssertNonvoid(InstancePtr != NULL);
	Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);

	/*
	 * Read from the data register of channel 1 which is always guaranteed
	 * to be in the hardware device. Since the data may be configured as
	 * all inputs, there is not way to guarantee the value read so don't
	 * test it.
	 */
	(void) XGpio_DiscreteRead(InstancePtr, 1);

	return (XST_SUCCESS);
}