diff options
Diffstat (limited to 'rtc/ds1307.c')
| -rw-r--r-- | rtc/ds1307.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/rtc/ds1307.c b/rtc/ds1307.c deleted file mode 100644 index c882d79..0000000 --- a/rtc/ds1307.c +++ /dev/null @@ -1,204 +0,0 @@ -/* - * (C) Copyright 2001, 2002, 2003 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * Keith Outwater, keith_outwater@mvis.com` - * Steven Scholz, steven.scholz@imc-berlin.de - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -/* - * Date & Time support (no alarms) for Dallas Semiconductor (now Maxim) - * DS1307 and DS1338 Real Time Clock (RTC). - * - * based on ds1337.c - */ - -#include <common.h> -#include <command.h> -#include <rtc.h> -#include <i2c.h> - -#if (defined(CONFIG_RTC_DS1307) || defined(CONFIG_RTC_DS1338) ) && \ - defined(CONFIG_CMD_DATE) - -/*---------------------------------------------------------------------*/ -#undef DEBUG_RTC - -#ifdef DEBUG_RTC -#define DEBUGR(fmt,args...) printf(fmt ,##args) -#else -#define DEBUGR(fmt,args...) -#endif -/*---------------------------------------------------------------------*/ - -#ifndef CFG_I2C_RTC_ADDR -# define CFG_I2C_RTC_ADDR 0x68 -#endif - -#if defined(CONFIG_RTC_DS1307) && (CFG_I2C_SPEED > 100000) -# error The DS1307 is specified only up to 100kHz! -#endif - -/* - * RTC register addresses - */ -#define RTC_SEC_REG_ADDR 0x00 -#define RTC_MIN_REG_ADDR 0x01 -#define RTC_HR_REG_ADDR 0x02 -#define RTC_DAY_REG_ADDR 0x03 -#define RTC_DATE_REG_ADDR 0x04 -#define RTC_MON_REG_ADDR 0x05 -#define RTC_YR_REG_ADDR 0x06 -#define RTC_CTL_REG_ADDR 0x07 - -#define RTC_SEC_BIT_CH 0x80 /* Clock Halt (in Register 0) */ - -#define RTC_CTL_BIT_RS0 0x01 /* Rate select 0 */ -#define RTC_CTL_BIT_RS1 0x02 /* Rate select 1 */ -#define RTC_CTL_BIT_SQWE 0x10 /* Square Wave Enable */ -#define RTC_CTL_BIT_OUT 0x80 /* Output Control */ - -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); - -/* - * Get the current time from the RTC - */ -void rtc_get (struct rtc_time *tmp) -{ - uchar sec, min, hour, mday, wday, mon, year; - - sec = rtc_read (RTC_SEC_REG_ADDR); - min = rtc_read (RTC_MIN_REG_ADDR); - hour = rtc_read (RTC_HR_REG_ADDR); - wday = rtc_read (RTC_DAY_REG_ADDR); - mday = rtc_read (RTC_DATE_REG_ADDR); - mon = rtc_read (RTC_MON_REG_ADDR); - year = rtc_read (RTC_YR_REG_ADDR); - - DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x " - "hr: %02x min: %02x sec: %02x\n", - year, mon, mday, wday, hour, min, sec); - - if (sec & RTC_SEC_BIT_CH) { - printf ("### Warning: RTC oscillator has stopped\n"); - /* clear the CH flag */ - rtc_write (RTC_SEC_REG_ADDR, - rtc_read (RTC_SEC_REG_ADDR) & ~RTC_SEC_BIT_CH); - } - - 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 & 0x1F); - tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000); - tmp->tm_wday = bcd2bin ((wday - 1) & 0x07); - tmp->tm_yday = 0; - tmp->tm_isdst= 0; - - DEBUGR ("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); -} - - -/* - * Set the RTC - */ -void rtc_set (struct rtc_time *tmp) -{ - DEBUGR ("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); - - if (tmp->tm_year < 1970 || tmp->tm_year > 2069) - printf("WARNING: year should be between 1970 and 2069!\n"); - - rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100)); - rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon)); - rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1)); - rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday)); - rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour)); - rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min)); - rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec)); -} - - -/* - * Reset the RTC. We setting the date back to 1970-01-01. - * We also enable the oscillator output on the SQW/OUT pin and program - * it for 32,768 Hz output. Note that according to the datasheet, turning - * on the square wave output increases the current drain on the backup - * battery to something between 480nA and 800nA. - */ -void rtc_reset (void) -{ - struct rtc_time tmp; - - rtc_write (RTC_SEC_REG_ADDR, 0x00); /* clearing Clock Halt */ - rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_SQWE | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS0); - - tmp.tm_year = 1970; - tmp.tm_mon = 1; - tmp.tm_mday= 1; - tmp.tm_hour = 0; - tmp.tm_min = 0; - tmp.tm_sec = 0; - - rtc_set(&tmp); - - printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n", - tmp.tm_year, tmp.tm_mon, tmp.tm_mday, - tmp.tm_hour, tmp.tm_min, tmp.tm_sec); - - return; -} - - -/* - * Helper functions - */ - -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)); -} - -#endif |