firmware/drivers/rtc/rtc_rx5x348ab.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id: rtc_as3514.c 12131 2007-01-27 20:48:48Z dan_a $
   9  *
  10  * Copyright (C) 2007 by Jonathan Gordon
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #include "config.h"
  21 #include "spi.h"
  22 #include "rtc.h"
  23 #include <stdbool.h>
  24 /* Choose one of: */
  25 #define ADDR_READ       0x04
  26 #define ADDR_WRITE      0x00
  27 /* and one of: */
  28 #define ADDR_ONE        0x08
  29 #define ADDR_BURST      0x00
  30 void rtc_init(void)
  31 {
  32 }
  33
  34 int rtc_read_datetime(unsigned char* buf)
  35 {
  36     char command = ADDR_READ|ADDR_BURST; /* burst read from the start of the time/date reg */
  37     spi_block_transfer(SPI_target_RX5X348AB,
  38                        &command, 1, buf, 7);
  39     return 1;
  40 }
  41 int rtc_write_datetime(unsigned char* buf)
  42 {
  43     char command = ADDR_WRITE|ADDR_BURST; /* burst read from the start of the time/date reg */
  44     char data[8];
  45     int i;
  46     data[0] = command;
  47     for (i=1;i<8;i++)
  48         data[i] = buf[i-1];
  49     spi_block_transfer(SPI_target_RX5X348AB,
  50                        data, 8, NULL, 0);
  51     return 1;
  52 }