URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libchip/] [rtc/] [m48t08.c] - Rev 593
Go to most recent revision | Compare with Previous | Blame | View Log
/* * This file interfaces with the real-time clock found in * a Mostek M48T08 or M48T18 or compatibles. * * Year 2K Notes: * * This chip only uses a two digit field to store the year. This * code uses the RTEMS Epoch as a pivot year. This lets us map the * two digit year field as follows: * * + two digit years 0-87 are mapped to 2000-2087. * + two digit years 88-99 are mapped to 1988-1999. * * This is less than the time span supported by RTEMS. * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: m48t08.c,v 1.2 2001-09-27 12:01:42 chris Exp $ */ #include <rtems.h> #include <libchip/rtc.h> #include <libchip/m48t08.h> /* * Control register bits */ #define M48T08_CONTROL_WRITE 0x80 #define M48T08_CONTROL_READ 0x40 #define M48T08_CONTROL_SIGN 0x20 /* * m48t08_initialize */ void m48t08_initialize( int minor ) { } /* * m48t08_get_time */ #define From_BCD( _x ) ((((_x) >> 4) * 10) + ((_x) & 0x0F)) #define To_BCD( _x ) ((((_x) / 10) << 4) + ((_x) % 10)) int m48t08_get_time( int minor, rtems_time_of_day *time ) { unsigned32 m48t08; getRegister_f getReg; setRegister_f setReg; unsigned8 controlReg; unsigned32 value1; unsigned32 value2; m48t08 = RTC_Table[ minor ].ulCtrlPort1; getReg = RTC_Table[ minor ].getRegister; setReg = RTC_Table[ minor ].setRegister; /* * Put the RTC into read mode */ controlReg = (*getReg)( m48t08, M48T08_CONTROL ); (*setReg)( m48t08, M48T08_CONTROL, controlReg | M48T08_CONTROL_READ ); value1 = (*getReg)( m48t08, M48T08_YEAR ); value2 = From_BCD( value1 ); if ( value2 < 88 ) time->year = 2000 + value2; else time->year = 1900 + value2; value1 = (*getReg)( m48t08, M48T08_MONTH ); time->month = From_BCD( value1 ); value1 = (*getReg)( m48t08, M48T08_DATE ); time->day = From_BCD( value1 ); value1 = (*getReg)( m48t08, M48T08_HOUR ); time->hour = From_BCD( value1 ); value1 = (*getReg)( m48t08, M48T08_MINUTE ); time->minute = From_BCD( value1 ); value1 = (*getReg)( m48t08, M48T08_SECOND ); time->second = From_BCD( value1 ); time->ticks = 0; /* * Put the RTC back into normal mode. */ (*setReg)( m48t08, M48T08_CONTROL, controlReg ); return 0; } /* * m48t08_set_time */ int m48t08_set_time( int minor, rtems_time_of_day *time ) { unsigned32 m48t08; getRegister_f getReg; setRegister_f setReg; unsigned8 controlReg; m48t08 = RTC_Table[ minor ].ulCtrlPort1; getReg = RTC_Table[ minor ].getRegister; setReg = RTC_Table[ minor ].setRegister; /* * Put the RTC into read mode */ controlReg = (*getReg)( m48t08, M48T08_CONTROL ); (*setReg)( m48t08, M48T08_CONTROL, controlReg | M48T08_CONTROL_WRITE ); if ( time->year >= 2088 ) rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER ); (*setReg)( m48t08, M48T08_YEAR, To_BCD(time->year % 100) ); (*setReg)( m48t08, M48T08_MONTH, To_BCD(time->month) ); (*setReg)( m48t08, M48T08_DATE, To_BCD(time->day) ); (*setReg)( m48t08, M48T08_HOUR, To_BCD(time->hour) ); (*setReg)( m48t08, M48T08_MINUTE, To_BCD(time->minute) ); (*setReg)( m48t08, M48T08_SECOND, To_BCD(time->second) ); /* * Put the RTC back into normal mode. */ (*setReg)( m48t08, M48T08_CONTROL, controlReg ); return 0; } /* * Driver function table */ rtc_fns m48t08_fns = { m48t08_initialize, m48t08_get_time, m48t08_set_time };
Go to most recent revision | Compare with Previous | Blame | View Log