drv_rtc.c

Epson系列芯片开发的例子

/********************************************************************************************************
 *													*
 *	Copyright (C) SEIKO EPSON CORP. 2002								*
 *													*
 *	File name: Drv_RTC.c										*
 *	  This is RTC driver for c33 star.								*
 *													*
 *	Revision history										*
 *		2002.06.4	Andrew Yin	Start.							*
 *													*
 *******************************************************************************************************/

#include "common.h"
#include "ct.h"
#include "int.h"

// Prototype
void vInitRTC( unsigned char, unsigned char, unsigned short );
void vRTCStart( void );
void vRTCStop( void );
void vIntRTC( void );

unsigned char ucRTCReadSecond( void );
unsigned char ucRTCReadMinute( void );
unsigned char ucRTCReadHour( void );
unsigned short usRTCReadDay( void );

unsigned char gucSecond;
unsigned char gucMinute;
unsigned char gucHour;
unsigned short gusDay;
unsigned char gucRTCSecondFlag;

/*******************************************************************************
 * vInitRTC
 *   Type :	void
 *   Ret val :	none
 *   Argument :	unsigned char ,unsigned char, unsigned int.
 *   Function :	Initialize RTC.
 *******************************************************************************/
void vInitRTC( unsigned char ucMinute,unsigned char ucHour,unsigned short usDay )
{
	// Setting clock timer interrupt disable 
	*( volatile unsigned char * )INT_EADE_ECTM_EP4_ADDR &= ~INT_ECTM;
	
	// Setting clock timer stop
	*( volatile unsigned char * )CT_TCRUN_ADDR &= 0x0FE;
	
	// Reset the clock timer
	*( volatile unsigned char * )CT_TCRUN_ADDR |= CT_TCRST_RST;
	
	// Clock timer interrupt factor selection: rtc --> 1Hz, alarm --> none
	*( volatile unsigned char * )CT_TCAF_ADDR = CT_TCISE_1HZ | CT_TCASE_NONE | CT_TCIF_RST | CT_TCAF_RST;
		
	// Presetting the current day and time in the minute,hour,and day counters
	*( volatile unsigned char * )CT_TCHD_ADDR = ucMinute;
	*( volatile unsigned char * )CT_TCDD_ADDR = ucHour;
	*( volatile unsigned char * )CT_TCNDL_ADDR = ( unsigned char )usDay;
	*( volatile unsigned char * )CT_TCNDH_ADDR = ( unsigned char )( usDay >> 8 );
	
	// Clear the Clock timer interrupt flag
	*( volatile unsigned char * )INT_FADE_FCTM_FP4_ADDR |= INT_FCTM;
	
	// Clock timer interrupt enable
	*( volatile unsigned char * )INT_EADE_ECTM_EP4_ADDR |= INT_ECTM;

}

/*******************************************************************************
 * vIntRTC
 *   Type :	void
 *   Ret val :	none
 *   Argument :	void
 *   Function :	1 second interrupt
 *******************************************************************************/
void vIntRTC( void )
{
	asm("pushn	%r15");			// save r1,r2...r15
	asm("ld.w	%r9,%psr");		// EI,enable interrupt 
	asm("or 	%r9,0x10");
	asm("ld.w	%psr,%r9");
	
	gucSecond = ucRTCReadSecond( );
	gucMinute = ucRTCReadMinute( );
	gucHour = ucRTCReadHour( );
	gusDay = usRTCReadDay( );
	
	gucRTCSecondFlag = 1;
	
	// Clear interrupt flag
	*( volatile unsigned char * )INT_FADE_FCTM_FP4_ADDR |= INT_FCTM;
	
	asm("popn	%r15");
	asm("reti");
}

/*******************************************************************************
 * vRTCStart
 *   Type :	void
 *   Ret val :	none
 *   Argument :	void
 *   Function :	Run RTC
 *******************************************************************************/
void vRTCStart( void )
{
	gucSecond = 0;
	*( volatile unsigned char * )CT_TCRUN_ADDR |= 0x01;
}


/*******************************************************************************
 * vRTCStop
 *   Type :	void
 *   Ret val :	none
 *   Argument :	void
 *   Function :	Stop rtc.
 *******************************************************************************/
void vRTCStop( void )
{
	*( volatile unsigned char * )CT_TCRUN_ADDR = 0x0FE;
}

/*******************************************************************************
 * ucRTCReadSecond
 *   Type :	unsigned char
 *   Ret val :	rtc value
 *   Argument :	none
 *   Function :	Read rtc value of second.
 *******************************************************************************/
unsigned char ucRTCReadSecond( void )
{
	return( *( volatile unsigned char * )CT_TCMD_ADDR);
}

/*******************************************************************************
 * ucRTCReadMinute
 *   Type :	unsigned char
 *   Ret val :	rtc value
 *   Argument :	none
 *   Function :	Read rtc value of minute.
 *******************************************************************************/
unsigned char ucRTCReadMinute( void )
{
	return( *( volatile unsigned char * )CT_TCHD_ADDR);
}

/*******************************************************************************
 * ucRTCReadHour
 *   Type :	unsigned char
 *   Ret val :	rtc value
 *   Argument :	none
 *   Function :	Read rtc value of hour.
 *******************************************************************************/
unsigned char ucRTCReadHour( void )
{
	return( *( volatile unsigned char * )CT_TCDD_ADDR);
}

/*******************************************************************************
 * usRTCReadDay
 *   Type :	unsigned char
 *   Ret val :	rtc value
 *   Argument :	none
 *   Function :	Read rtc value of Day.
 *******************************************************************************/
unsigned short usRTCReadDay( void )
{
	unsigned short day;
	day = *( volatile unsigned char * )CT_TCNDH_ADDR;
	day <<= 8;					//left shift 8 bit
	day |= *( volatile unsigned char * )CT_TCNDL_ADDR;
	return( day );
}