rtc_pcf8563.c

来自「AT91RM9200的RTC测试程序」· C语言 代码 · 共 139 行

/*
 * Date & Time support for Philips PCF8563 RTC
 * CHENMENG(Meterchen) 20041200
 * www.cmtekchina.com
 */

/* #define	DEBUG	*/

#undef DEBUG
//#define DEBUG

#ifdef DEBUG
#define debug Print
#else
#define debug
#endif


#include "rtc_pcf8563.h"

#define uchar unsigned char
#define CFG_I2C_RTC_ADDR 0xa2


/*static ""*/uchar rtc_read(uchar reg);
/*static*/ void  rtc_write (uchar reg, uchar val);
static uchar bin2bcd   (unsigned int n);
static unsigned bcd2bin(uchar c);

/* ------------------------------------------------------------------------- */

void RTC_Get (struct rtc_time *tmp)
{
	uchar sec, min, hour, mday, wday, mon_cent, year;

	sec	= rtc_read (0x02);
	min	= rtc_read (0x03);
	hour	= rtc_read (0x04);
	mday	= rtc_read (0x05);
	wday	= rtc_read (0x06);
	mon_cent= rtc_read (0x07);
	year	= rtc_read (0x08);

	if (sec & 0x80) {
		//puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
	}

	tmp->tm_sec  = bcd2bin (sec  & 0x7F);
	tmp->tm_min  = bcd2bin (min  & 0x7F);
	tmp->tm_hour = bcd2bin (hour & 0x3F);
	tmp->tm_mday = bcd2bin (mday & 0x3F);
	tmp->tm_mon  = bcd2bin (mon_cent & 0x1F);
	tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
	tmp->tm_wday = bcd2bin (wday & 0x07);
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;
/*
	debug ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
*/
}


void RTC_Set (struct rtc_time *tmp)
{
	uchar century;
/*
	debug ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
*/
	rtc_write (0x08, bin2bcd(tmp->tm_year % 100));

	century = (tmp->tm_year >= 2000) ? 0x80 : 0;
	rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);

	rtc_write (0x06, bin2bcd(tmp->tm_wday));
	rtc_write (0x05, bin2bcd(tmp->tm_mday));
	rtc_write (0x04, bin2bcd(tmp->tm_hour));
	rtc_write (0x03, bin2bcd(tmp->tm_min ));
	rtc_write (0x02, bin2bcd(tmp->tm_sec ));
}

void RTC_Reset (void)
{
	/* clear all control & status registers */
	rtc_write (0x00, 0x00);
	rtc_write (0x01, 0x00);
	rtc_write (0x0D, 0x00);

	/* clear Voltage Low bit */
	rtc_write (0x02, rtc_read (0x02) & 0x7F);

	/* reset all alarms */
	rtc_write (0x09, 0x00);
	rtc_write (0x0A, 0x00);
	rtc_write (0x0B, 0x00);
	rtc_write (0x0C, 0x00);
}


char i2c_reg_read(char slave, char reg)
{
	//return I2C_Read(slave, reg);
	char read;
	
	AT91F_TWI_Read(0xFFFB8000, reg, (char *)&read, 1);
	
	return read;
}

char i2c_reg_write (char slave, char reg, char val)
{
	//I2C_Write(slave, reg, val);
	AT91F_TWI_Write(0xFFFB8000, reg, &val, 1); 
}
/* ------------------------------------------------------------------------- */

/*static */uchar rtc_read (uchar reg)
{
	return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg));
}

/*static */void rtc_write (uchar reg, uchar val)
{
	i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val);
}

static unsigned bcd2bin (uchar n)
{
	return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
}

static unsigned char bin2bcd (unsigned int n)
{
	return (((n / 10) << 4) | (n % 10));
}