[z180-stamp.git] / avr / pcf8583.c

/*
 * Date & Time support for Philips PCF8583 RTC
 */

#include "common.h"
#include <stdlib.h>
#include "debug.h"
#include "command.h"
#include "rtc.h"
#include "i2c.h"

#define  DEBUG_RTC 0

#define debug_rtc(fmt, args...)			\
	debug_cond(DEBUG_RTC, fmt, ##args)

#define REG_CS		0x00	/* control/status */
#define REG_CSEC	0x01	/* hundredth of a second */
#define REG_SEC		0x02	/* seconds */
#define REG_MIN		0x03	/* minutes */
#define REG_HOUR	0x04	/* hours */
#define REG_YRDATE	0x05	/* year/date */
#define REG_WDMON	0x06	/* weekdays/months */
#define NR_OF_REGS	7


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

static uint_fast8_t bcd2bin(uint8_t val)
{
	return (val >> 4) * 10 + (val & 0x0f);
}

static uint8_t bin2bcd (uint_fast8_t val)
{
	div_t d = div(val, 10);
	
	return (d.quot << 4) | d.rem;
}


int rtc_get (struct rtc_time *tmp)
{
	int rel = 0;
	uint8_t rtcbuf[NR_OF_REGS];
	uint16_t year;
	
	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS);
	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &year, 2);

	debug_rtc("Get RTC year: %u, year/date: %02x, wdays/month: %02x, "
		"hour: %02x, min: %02x, sec: %02x, (stat: %02x)\n", year,
		rtcbuf[6], rtcbuf[5], rtcbuf[4], rtcbuf[3], rtcbuf[2], rtcbuf[0]);

	tmp->tm_sec  = bcd2bin (rtcbuf[REG_SEC]    & 0x7F);
	tmp->tm_min  = bcd2bin (rtcbuf[REG_MIN]    & 0x7F);
	tmp->tm_hour = bcd2bin (rtcbuf[REG_HOUR]   & 0x3F);
	tmp->tm_mday = bcd2bin (rtcbuf[REG_YRDATE] & 0x3F);
	tmp->tm_mon  = bcd2bin (rtcbuf[REG_WDMON]  & 0x1F);
	while (year%4 < (rtcbuf[REG_YRDATE]>>6)) {
		year++;
		/* TODO: update RTC ram */
	}
	tmp->tm_year  = year; 
	tmp->tm_wday = rtcbuf[REG_WDMON] >> 5;
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;


	debug_rtc( "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);

	return rel;
}

int rtc_set (struct rtc_time *tmp)
{
	uint8_t rtcbuf[NR_OF_REGS];

	debug_rtc("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);

	rtcbuf[REG_CS] = 0x84;
	rtcbuf[REG_CSEC] = 0x00;
	rtcbuf[REG_WDMON ] = bin2bcd(tmp->tm_mon) | ((tmp->tm_wday) << 5);
	rtcbuf[REG_YRDATE] = ((tmp->tm_year % 4) << 6) | bin2bcd(tmp->tm_mday);
	rtcbuf[REG_HOUR  ] = bin2bcd(tmp->tm_hour);
	rtcbuf[REG_MIN   ] = bin2bcd(tmp->tm_min);
	rtcbuf[REG_SEC   ] = bin2bcd(tmp->tm_sec);

	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0,    1, rtcbuf, NR_OF_REGS);
	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &tmp->tm_year, 2);
	rtcbuf[REG_CS] = 0x04;
	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, 1);


	return 0;
}
Commit	Line	Data
61b0cfe9 L	1	/*
	2	* Date & Time support for Philips PCF8583 RTC
	3	*/
	4
61b0cfe9 L	5	#include "common.h"
	6	#include <stdlib.h>
	7	#include "debug.h"
	8	#include "command.h"
	9	#include "rtc.h"
	10	#include "i2c.h"
	11
f14850db L	12	#define DEBUG_RTC 0
	13
	14	#define debug_rtc(fmt, args...) \
	15	debug_cond(DEBUG_RTC, fmt, ##args)
	16
61b0cfe9 L	17	#define REG_CS 0x00 /* control/status */
	18	#define REG_CSEC 0x01 /* hundredth of a second */
	19	#define REG_SEC 0x02 /* seconds */
	20	#define REG_MIN 0x03 /* minutes */
	21	#define REG_HOUR 0x04 /* hours */
	22	#define REG_YRDATE 0x05 /* year/date */
	23	#define REG_WDMON 0x06 /* weekdays/months */
	24	#define NR_OF_REGS 7
	25
	26
	27	/* ------------------------------------------------------------------------- */
	28
	29	static uint_fast8_t bcd2bin(uint8_t val)
	30	{
	31	return (val >> 4) * 10 + (val & 0x0f);
	32	}
	33
	34	static uint8_t bin2bcd (uint_fast8_t val)
	35	{
	36	div_t d = div(val, 10);
	37
	38	return (d.quot << 4) \| d.rem;
	39	}
	40
	41
	42	int rtc_get (struct rtc_time *tmp)
	43	{
	44	int rel = 0;
	45	uint8_t rtcbuf[NR_OF_REGS];
	46	uint16_t year;
	47
	48	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS);
	49	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &year, 2);
	50
f14850db	51	debug_rtc("Get RTC year: %u, year/date: %02x, wdays/month: %02x, "
61b0cfe9 L	52	"hour: %02x, min: %02x, sec: %02x, (stat: %02x)\n", year,
	53	rtcbuf[6], rtcbuf[5], rtcbuf[4], rtcbuf[3], rtcbuf[2], rtcbuf[0]);
	54
	55	tmp->tm_sec = bcd2bin (rtcbuf[REG_SEC] & 0x7F);
	56	tmp->tm_min = bcd2bin (rtcbuf[REG_MIN] & 0x7F);
	57	tmp->tm_hour = bcd2bin (rtcbuf[REG_HOUR] & 0x3F);
	58	tmp->tm_mday = bcd2bin (rtcbuf[REG_YRDATE] & 0x3F);
	59	tmp->tm_mon = bcd2bin (rtcbuf[REG_WDMON] & 0x1F);
	60	while (year%4 < (rtcbuf[REG_YRDATE]>>6)) {
	61	year++;
	62	/* TODO: update RTC ram */
	63	}
	64	tmp->tm_year = year;
	65	tmp->tm_wday = rtcbuf[REG_WDMON] >> 5;
	66	tmp->tm_yday = 0;
	67	tmp->tm_isdst= 0;
	68
	69
f14850db	70	debug_rtc( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
61b0cfe9 L	71	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	72	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	73
	74	return rel;
	75	}
	76
	77	int rtc_set (struct rtc_time *tmp)
	78	{
	79	uint8_t rtcbuf[NR_OF_REGS];
	80
f14850db	81	debug_rtc("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
61b0cfe9 L	82	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	83	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	84
	85	rtcbuf[REG_CS] = 0x84;
	86	rtcbuf[REG_CSEC] = 0x00;
	87	rtcbuf[REG_WDMON ] = bin2bcd(tmp->tm_mon) \| ((tmp->tm_wday) << 5);
	88	rtcbuf[REG_YRDATE] = ((tmp->tm_year % 4) << 6) \| bin2bcd(tmp->tm_mday);
	89	rtcbuf[REG_HOUR ] = bin2bcd(tmp->tm_hour);
	90	rtcbuf[REG_MIN ] = bin2bcd(tmp->tm_min);
	91	rtcbuf[REG_SEC ] = bin2bcd(tmp->tm_sec);
	92
	93	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS);
	94	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &tmp->tm_year, 2);
	95	rtcbuf[REG_CS] = 0x04;
	96	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, 1);
	97
	98
	99	return 0;
	100	}