xuartlite_selftest.c

Here an embedded System-on-Chip is build, in an Xilinx Spartan-3 FPGA with Microblaze as the process

/* $Id: xuartlite_selftest.c,v 1.1 2007/05/15 07:00:27 mta Exp $ */
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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.
*
* @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.
*
******************************************************************************/
int XUartLite_SelfTest(XUartLite *InstancePtr)
{
	u32 StatusRegister;

	/*
	 * Assert validates the input arguments
	 */
	XASSERT_NONVOID(InstancePtr != NULL);
	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;
}