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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [devs/] [wallclock/] [dallas/] [ds1742/] [v2_0/] [ds1742.inl] - Blame information for rev 590

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//==========================================================================
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//
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//      devs/wallclock/ds1742.inl
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//
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//      Wallclock implementation for Dallas 1742
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//
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s):     jskov
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// Contributors:  jskov
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// Date:          2000-05-25
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// Purpose:       Wallclock driver for Dallas 1742
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#ifndef DS_BASE
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# error "Need to know base of DS1742 RAM"
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#endif
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#include          // Common type definitions and support
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#include              // IO macros
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// Offsets from DS_BASE
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#define DS_SECONDS       0x7f9          // control bit!
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#define DS_SECONDS_MASK  0x7f
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#define DS_MINUTES       0x7fa
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#define DS_HOUR          0x7fb
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#define DS_DAY           0x7fc          // control bits
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#define DS_DAY_MASK      0x07
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#define DS_DATE          0x7fd
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#define DS_MONTH         0x7fe
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#define DS_YEAR          0x7ff
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#define DS_CENTURY       0x7f8          // control bits!
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#define DS_CENTURY_MASK  0x3f
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// Control bits
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#define DS_SECONDS_OSC   0x80           // set to stop oscillator (power save)
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#define DS_CENTURY_READ  0x40           // set during read
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#define DS_CENTURY_WRITE 0x80           // set during write
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#define DS_DAY_BF        0x80           // battery flag
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#define DS_DAY_FT        0x40           // frequency test
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// Make sure test modes are disabled and that clock is running.
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static void
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init_ds_hwclock(void)
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{
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    cyg_uint8 _tmp;
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    // Enable clock
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    HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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    _tmp &= ~DS_SECONDS_OSC;
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    HAL_WRITE_UINT8(DS_BASE+DS_SECONDS, _tmp);
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    // clear frequency test
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    HAL_READ_UINT8(DS_BASE+DS_DAY, _tmp);
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    _tmp &= ~DS_DAY_FT;
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    HAL_WRITE_UINT8(DS_BASE+DS_DAY, _tmp);
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}
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static void
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set_ds_hwclock(cyg_uint32 year, cyg_uint32 month, cyg_uint32 mday,
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               cyg_uint32 hour, cyg_uint32 minute, cyg_uint32 second)
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{
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    cyg_uint8 _tmp;
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    // Init write operation
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    HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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    _tmp |= DS_CENTURY_WRITE;
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    HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    // Entries with control bits
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    HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    _tmp &= ~DS_CENTURY_MASK;
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    _tmp |= TO_BCD(year/100) & DS_CENTURY_MASK;
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    HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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    _tmp &= ~DS_SECONDS_MASK;
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    _tmp |= TO_BCD(second) & DS_SECONDS_MASK;
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    HAL_WRITE_UINT8(DS_BASE+DS_SECONDS, _tmp);
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    HAL_READ_UINT8(DS_BASE+DS_DAY, _tmp);
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    _tmp &= ~DS_DAY_FT;                 // clear frequency test
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    HAL_WRITE_UINT8(DS_BASE+DS_DAY, _tmp);
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    // Dedicated entries
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    HAL_WRITE_UINT8(DS_BASE+DS_YEAR, TO_BCD(year % 100));
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    HAL_WRITE_UINT8(DS_BASE+DS_MONTH, TO_BCD(month));
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    HAL_WRITE_UINT8(DS_BASE+DS_DATE, TO_BCD(mday));
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    HAL_WRITE_UINT8(DS_BASE+DS_HOUR, TO_BCD(hour));
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    HAL_WRITE_UINT8(DS_BASE+DS_MINUTES, TO_BCD(minute));
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    // Enable clock
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    HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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    _tmp &= ~DS_SECONDS_OSC;
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    HAL_WRITE_UINT8(DS_BASE+DS_SECONDS, _tmp);
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    // Finish write operation
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    HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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    HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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}
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static void
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get_ds_hwclock(cyg_uint32* year, cyg_uint32* month, cyg_uint32* mday,
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               cyg_uint32* hour, cyg_uint32* minute, cyg_uint32* second)
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{
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    cyg_uint8 _tmp;
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    // Init read operation
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    HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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    _tmp |= DS_CENTURY_READ;
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    HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    // Entries with control bits
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    HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    _tmp &= DS_CENTURY_MASK;
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    *year = 100*TO_DEC(_tmp);
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    HAL_READ_UINT8(DS_BASE+DS_SECONDS, _tmp);
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    _tmp &= DS_SECONDS_MASK;
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    *second = TO_DEC(_tmp);
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    // Dedicated entries
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    HAL_READ_UINT8(DS_BASE+DS_YEAR, _tmp);
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    *year += TO_DEC(_tmp);
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    HAL_READ_UINT8(DS_BASE+DS_MONTH, _tmp);
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    *month = TO_DEC(_tmp);
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    HAL_READ_UINT8(DS_BASE+DS_DATE, _tmp);
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    *mday = TO_DEC(_tmp);
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    HAL_READ_UINT8(DS_BASE+DS_HOUR, _tmp);
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    *hour = TO_DEC(_tmp);
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    HAL_READ_UINT8(DS_BASE+DS_MINUTES, _tmp);
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    *minute = TO_DEC(_tmp);
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    // Finish read operation
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    HAL_READ_UINT8(DS_BASE+DS_CENTURY, _tmp);
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    _tmp &= ~(DS_CENTURY_WRITE|DS_CENTURY_READ);
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    HAL_WRITE_UINT8(DS_BASE+DS_CENTURY, _tmp);
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}
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//-----------------------------------------------------------------------------
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// End of devs/wallclock/ds1742.inl

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