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authorRobert Kukla <roolku@rockbox.org>2008-02-03 18:15:39 +0000
committerRobert Kukla <roolku@rockbox.org>2008-02-03 18:15:39 +0000
commit9dc67828a9906498a16fd4ad55ae5319cc934dd1 (patch)
treed127977ce10ba6773ee142419267051027b3f2b5 /firmware/drivers/rtc/rtc_mr100.c
parent6f65afd0b757e2111c5b764def30170caa937a6f (diff)
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mrobe 100: real time clock (if anybody recognises the RTC chip let me know)
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16208 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/drivers/rtc/rtc_mr100.c')
-rw-r--r--firmware/drivers/rtc/rtc_mr100.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/firmware/drivers/rtc/rtc_mr100.c b/firmware/drivers/rtc/rtc_mr100.c
new file mode 100644
index 0000000000..96d84156a7
--- /dev/null
+++ b/firmware/drivers/rtc/rtc_mr100.c
@@ -0,0 +1,114 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2008 by Robert Kukla
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "rtc.h"
+#include "logf.h"
+#include "sw_i2c.h"
+#include "i2c-pp.h"
+
+/* The RTC chip is unknown, the information about it was gathered by
+ * reverse engineering the bootloader.
+ */
+
+#define RTC_ADDR 0x60
+
+#define RTC_CMD_CTRL 0 /* OF uses it with single byte 1 or 2 */
+#define RTC_CMD_UNKN 1 /* OF uses it with single byte 8 */
+#define RTC_CMD_DATA 2
+#define RTC_CMD_TEST 7 /* OF uses it with single byte 0xAA */
+
+/* private */
+
+static void reverse_bits(unsigned char* v, int size) {
+
+ int i,j,in,out=0;
+
+ for(j=0; j<size; j++) {
+ in = v[j];
+ for(i=0; i<8; i++) {
+ out |= (in & 1);
+ in = in >>1;
+ out = out<<1;
+ }
+ v[j] = out>>1;
+ }
+}
+
+static int sw_i2c(int access, unsigned char chip, unsigned char cmd,
+ unsigned char* buf, int count) {
+ int i;
+
+ i2c_lock();
+ GPIOC_ENABLE |= 0x00000030;
+
+ chip|=cmd<<1;
+
+ if(access == SW_I2C_READ) {
+ i = sw_i2c_read(chip, 0, buf, count);
+ reverse_bits(buf, count);
+ } else {
+ reverse_bits(buf, count);
+ i = sw_i2c_write(chip, 0, buf, count);
+ }
+
+ GPIOC_ENABLE &= ~0x00000030;
+ i2c_unlock();
+
+ return i;
+}
+
+/* public */
+
+void rtc_init(void)
+{
+ sw_i2c_init();
+
+ /* to set a time while buttons are stil not working
+ unsigned char v[7] = {0x00,0x47,0x17,0x06,0x03,0x02,0x08};
+ rtc_write_datetime(v);
+ */
+}
+
+int rtc_read_datetime(unsigned char* buf)
+{
+ int i;
+ unsigned char v[7];
+
+ i = sw_i2c(SW_I2C_READ, RTC_ADDR, RTC_CMD_DATA, v, 7);
+
+ v[4] &= 0x3f; /* mask out p.m. flag */
+
+ for(i=0; i<7; i++)
+ buf[i] = v[6-i];
+
+ return i;
+}
+
+int rtc_write_datetime(unsigned char* buf)
+{
+ int i;
+ unsigned char v[7];
+
+ for(i=0; i<7; i++)
+ v[i]=buf[6-i];
+
+ i = sw_i2c(SW_I2C_WRITE, RTC_ADDR, RTC_CMD_DATA, v, 7);
+
+ return i;
+}
+