xuartlite_selftest.c

基于Xilinx-XUPV2P开发平台的嵌入式系统实验例程：实验4编写基本的应用程序

/* $Id: xuartlite_selftest.c,v 1.1 2006/02/17 22:36:36 moleres Exp $ */
/*****************************************************************************
*
*       XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
*       AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
*       SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,
*       OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
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*       INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
*       FOR A PARTICULAR PURPOSE.
*
*       (c) Copyright 2002 Xilinx Inc.
*       All rights reserved.
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*****************************************************************************/
/****************************************************************************/
/**
*
* @file xuartlite_selftest.c
*
* This file contains the self-test functions for the UART Lite component
* (XUartLite).
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date     Changes
* ----- ---- -------- -----------------------------------------------
* 1.00a ecm  08/31/01 First release
* 1.00b jhl  02/21/02 Repartitioned the driver for smaller files
* </pre>
*
*****************************************************************************/

/***************************** Include Files ********************************/

#include "xbasic_types.h"
#include "xstatus.h"
#include "xuartlite.h"
#include "xuartlite_i.h"
#include "xio.h"

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


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


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


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


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


/****************************************************************************/
/**
*
* Runs a self-test on the device hardware.  Since there is no way to perform a
* loopback in the hardware, this test can only check the state of the status
* register to verify it is correct.  This test assumes that the hardware
* device is still in its reset state, but has been initialized with the
* Initialize function.
*
* @param    InstancePtr is a pointer to the XUartLite instance to be worked on.
*
* @return
*
* - XST_SUCCESS if the self-test was successful.
* - XST_FAILURE if the self-test failed, the status register value was not
*   correct
*
* @note
*
* None.
*
******************************************************************************/
XStatus XUartLite_SelfTest(XUartLite *InstancePtr)
{
    Xuint32 StatusRegister;

    /*
     * Assert validates the input arguments
     */
    XASSERT_NONVOID(InstancePtr != XNULL);
    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);

    /* get the control register value to check if it's the correct value after
     * a reset
     */
    StatusRegister = XIo_In32(InstancePtr->RegBaseAddress +
                               XUL_STATUS_REG_OFFSET);

    /* if the status register is any other value other than XUL_SR_TX_FIFO_EMPTY
     * then the test is a failure since this is the not the value after reset
     */
    if (StatusRegister != XUL_SR_TX_FIFO_EMPTY)
    {
        return XST_FAILURE;
    }

    return XST_SUCCESS;
}