115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Robert Kukla
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "rtc.h"
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#include "logf.h"
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#include "sw_i2c.h"
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#include "i2c-pp.h"
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/* The RTC chip is unknown, the information about it was gathered by
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* reverse engineering the bootloader.
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*/
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#define RTC_ADDR 0x60
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#define RTC_CMD_CTRL 0 /* OF uses it with single byte 1 or 2 */
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#define RTC_CMD_UNKN 1 /* OF uses it with single byte 8 */
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#define RTC_CMD_DATA 2
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#define RTC_CMD_TEST 7 /* OF uses it with single byte 0xAA */
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/* private */
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static void reverse_bits(unsigned char* v, int size) {
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int i,j,in,out=0;
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for(j=0; j<size; j++) {
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in = v[j];
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for(i=0; i<8; i++) {
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out |= (in & 1);
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in = in >>1;
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out = out<<1;
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}
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v[j] = out>>1;
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}
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}
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static int sw_i2c(int access, unsigned char chip, unsigned char cmd,
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unsigned char* buf, int count) {
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int i;
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i2c_lock();
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GPIOC_ENABLE |= 0x00000030;
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chip|=cmd<<1;
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if(access == SW_I2C_READ) {
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i = sw_i2c_read(chip, 0, buf, count);
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reverse_bits(buf, count);
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} else {
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reverse_bits(buf, count);
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i = sw_i2c_write(chip, 0, buf, count);
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}
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GPIOC_ENABLE &= ~0x00000030;
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i2c_unlock();
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return i;
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}
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/* public */
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void rtc_init(void)
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{
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sw_i2c_init();
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/* to set a time while buttons are stil not working
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unsigned char v[7] = {0x00,0x47,0x17,0x06,0x03,0x02,0x08};
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rtc_write_datetime(v);
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*/
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}
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int rtc_read_datetime(unsigned char* buf)
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{
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int i;
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unsigned char v[7];
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i = sw_i2c(SW_I2C_READ, RTC_ADDR, RTC_CMD_DATA, v, 7);
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v[4] &= 0x3f; /* mask out p.m. flag */
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for(i=0; i<7; i++)
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buf[i] = v[6-i];
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return i;
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}
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int rtc_write_datetime(unsigned char* buf)
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{
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int i;
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unsigned char v[7];
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for(i=0; i<7; i++)
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v[i]=buf[6-i];
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i = sw_i2c(SW_I2C_WRITE, RTC_ADDR, RTC_CMD_DATA, v, 7);
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return i;
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}
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