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

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

#include "common.h"
#include <stdlib.h>
#include "time.h"
#include "rtc.h"
#include "i2c.h"
#include "command.h"
#include "debug.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 tm *tmp)
{
	int rel = 0;
	uint8_t rtcbuf[NR_OF_REGS];
	int16_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) - 1;
	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 tm *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) + 1) | ((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"
61b0cfe9 L	6	#include <stdlib.h>
e63b2f75	7	#include "time.h"
61b0cfe9 L	8	#include "rtc.h"
61b0cfe9 L	9	#include "i2c.h"
e63b2f75 L	10	#include "command.h"
e63b2f75 L	11	#include "debug.h"
61b0cfe9	12
f14850db L	13	#define DEBUG_RTC 0
	14
	15	#define debug_rtc(fmt, args...) \
	16	debug_cond(DEBUG_RTC, fmt, ##args)
	17
61b0cfe9 L	18	#define REG_CS 0x00 /* control/status */
	19	#define REG_CSEC 0x01 /* hundredth of a second */
	20	#define REG_SEC 0x02 /* seconds */
	21	#define REG_MIN 0x03 /* minutes */
	22	#define REG_HOUR 0x04 /* hours */
	23	#define REG_YRDATE 0x05 /* year/date */
	24	#define REG_WDMON 0x06 /* weekdays/months */
	25	#define NR_OF_REGS 7
	26
	27
	28	/* ------------------------------------------------------------------------- */
	29
	30	static uint_fast8_t bcd2bin(uint8_t val)
	31	{
	32	return (val >> 4) * 10 + (val & 0x0f);
	33	}
	34
	35	static uint8_t bin2bcd (uint_fast8_t val)
	36	{
	37	div_t d = div(val, 10);
e63b2f75	38
61b0cfe9 L	39	return (d.quot << 4) \| d.rem;
	40	}
	41
	42
e63b2f75	43	int rtc_get (struct tm *tmp)
61b0cfe9 L	44	{
	45	int rel = 0;
	46	uint8_t rtcbuf[NR_OF_REGS];
e63b2f75 L	47	int16_t year;
e63b2f75 L	48
61b0cfe9 L	49	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS);
	50	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &year, 2);
	51
f14850db	52	debug_rtc("Get RTC year: %u, year/date: %02x, wdays/month: %02x, "
61b0cfe9 L	53	"hour: %02x, min: %02x, sec: %02x, (stat: %02x)\n", year,
	54	rtcbuf[6], rtcbuf[5], rtcbuf[4], rtcbuf[3], rtcbuf[2], rtcbuf[0]);
	55
	56	tmp->tm_sec = bcd2bin (rtcbuf[REG_SEC] & 0x7F);
	57	tmp->tm_min = bcd2bin (rtcbuf[REG_MIN] & 0x7F);
	58	tmp->tm_hour = bcd2bin (rtcbuf[REG_HOUR] & 0x3F);
	59	tmp->tm_mday = bcd2bin (rtcbuf[REG_YRDATE] & 0x3F);
e63b2f75	60	tmp->tm_mon = bcd2bin (rtcbuf[REG_WDMON] & 0x1F) - 1;
61b0cfe9 L	61	while (year%4 < (rtcbuf[REG_YRDATE]>>6)) {
	62	year++;
	63	/* TODO: update RTC ram */
	64	}
e63b2f75	65	tmp->tm_year = year;
61b0cfe9 L	66	tmp->tm_wday = rtcbuf[REG_WDMON] >> 5;
	67	tmp->tm_yday = 0;
	68	tmp->tm_isdst= 0;
	69
	70
f14850db	71	debug_rtc( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
61b0cfe9 L	72	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	73	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	74
	75	return rel;
	76	}
	77
e63b2f75	78	int rtc_set (struct tm *tmp)
61b0cfe9 L	79	{
	80	uint8_t rtcbuf[NR_OF_REGS];
	81
f14850db	82	debug_rtc("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
61b0cfe9 L	83	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	84	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	85
	86	rtcbuf[REG_CS] = 0x84;
	87	rtcbuf[REG_CSEC] = 0x00;
e63b2f75	88	rtcbuf[REG_WDMON ] = (bin2bcd(tmp->tm_mon) + 1) \| ((tmp->tm_wday) << 5);
61b0cfe9 L	89	rtcbuf[REG_YRDATE] = ((tmp->tm_year % 4) << 6) \| bin2bcd(tmp->tm_mday);
	90	rtcbuf[REG_HOUR ] = bin2bcd(tmp->tm_hour);
	91	rtcbuf[REG_MIN ] = bin2bcd(tmp->tm_min);
	92	rtcbuf[REG_SEC ] = bin2bcd(tmp->tm_sec);
	93
	94	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS);
	95	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &tmp->tm_year, 2);
	96	rtcbuf[REG_CS] = 0x04;
	97	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, 1);
	98
	99
	100	return 0;
	101	}