Colour targets: Revert an optimisation from almost 18 months ago that actually turned...
[Rockbox.git] / firmware / drivers / rtc / rtc_rx5x348ab.c
blob286cd774e314611562dc3993246e311171446df2
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 $
10 * Copyright (C) 2007 by Jonathan Gordon
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.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
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)
36 int rtc_read_datetime(unsigned char* buf)
38 char command = ADDR_READ|ADDR_BURST; /* burst read from the start of the time/date reg */
39 spi_block_transfer(SPI_target_RX5X348AB,
40 &command, 1, buf, 7);
41 return 1;
43 int rtc_write_datetime(unsigned char* buf)
45 char command = ADDR_WRITE|ADDR_BURST; /* burst read from the start of the time/date reg */
46 char data[8];
47 int i;
48 data[0] = command;
49 for (i=1;i<8;i++)
50 data[i] = buf[i-1];
51 spi_block_transfer(SPI_target_RX5X348AB,
52 data, 8, NULL, 0);
53 return 1;