rtc_test.c

ADI Blackfin BF51X 範例程式

/*******************************************************************
Analog Devices, Inc. All Rights Reserved.

This software is proprietary and confidential.  By using this software
you agree to the terms of the associated Analog Devices License Agreement.

Project Name:  	Power_On_Self_Test

Hardware:		ADSP-BF518F EZ-Board

Description:	This file tests the real-time clock (RTC) interface
				on the EZ-Board.
*******************************************************************/

/*******************************************************************
*  include files
*******************************************************************/
#include <cdefBF518.h>
#include <ccblkfn.h>

/*******************************************************************
*  global variables and defines
*******************************************************************/


/*******************************************************************
*  function prototypes
*******************************************************************/

int SET_RTC(void);
int CHECK_RTC(void);


/*******************************************************************
*   Function:    SET_RTC
*   Description: resets the RTC
*******************************************************************/
int SET_RTC(void)
{	
	*pRTC_PREN = 1;						/* enable prescaler so RTC runs at 1 Hz */
	while ((*pRTC_ISTAT&0x8000)==0);	/* wait for writes to complete */
	
	while ((*pRTC_ISTAT&4)==0);			/* wait for seconds event */
	
	*pRTC_STAT = 0;						/* reset clock */
	while ((*pRTC_ISTAT&0x8000)==0);	/* wait for writes to complete */

	return 1;
}


/*******************************************************************
*   Function:    CHECK_RTC
*   Description: performs a check on the RTC
*******************************************************************/
int CHECK_RTC(void)
{	
	/* we make sure the day (bits 31:17) and hour (bits 16:12) counters
	   are still zero, this gives the tester up to one hour to set and
	   check the RTC */
	unsigned int rtcstat = *pRTC_STAT;

	/* if any day or hour bits are set the test will return 0 (failure) */
	if (rtcstat & 0xfffff000)
		return 0;
	else
		return 1;
}