firmware/drivers/rtc/rtc_rx5x348ab.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Jonathan Gordon
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "spi.h"
  24 #include "rtc.h"
  25 #include <stdbool.h>
  26 /* Choose one of: */
  27 #define ADDR_READ       0x04
  28 #define ADDR_WRITE      0x00
  29 /* and one of: */
  30 #define ADDR_ONE        0x08
  31 #define ADDR_BURST      0x00
  32 void rtc_init(void)
  33 {
  34 }
  35
  36 int rtc_read_datetime(unsigned char* buf)
  37 {
  38     char command = ADDR_READ|ADDR_BURST; /* burst read from the start of the time/date reg */
  39     spi_block_transfer(SPI_target_RX5X348AB, &command, 1, buf, 7);
  40     return 1;
  41 }
  42 int rtc_write_datetime(unsigned char* buf)
  43 {
  44     char command = ADDR_WRITE|ADDR_BURST; /* burst read from the start of the time/date reg */
  45     char data[8];
  46     int i;
  47     data[0] = command;
  48     for (i=1;i<8;i++)
  49         data[i] = buf[i-1];
  50     spi_block_transfer(SPI_target_RX5X348AB, data, 8, NULL, 0);
  51     return 1;
  52 }