From 740eb36c10dd43b2307767f6101833d960399438 Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Mon, 24 Jun 2002 13:23:01 +0000
Subject: Added first RTC functions

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1151 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/rtc.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 firmware/drivers/rtc.c

(limited to 'firmware/drivers/rtc.c')

diff --git a/firmware/drivers/rtc.c b/firmware/drivers/rtc.c
new file mode 100644
index 0000000000..66b37fccb7
--- /dev/null
+++ b/firmware/drivers/rtc.c
@@ -0,0 +1,73 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * 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 "config.h"
+#ifdef HAVE_RTC
+#include "i2c.h"
+#include "rtc.h"
+
+#define RTC_ADR 0xd0
+#define	RTC_DEV_WRITE   (RTC_ADR | 0x00)
+#define	RTC_DEV_READ    (RTC_ADR | 0x01)
+
+int rtc_write(unsigned char address, unsigned char value)
+{
+    int ret = 0;
+    unsigned char buf[2];
+
+    i2c_begin();
+    
+    buf[0] = address;
+    buf[1] = value;
+
+    /* send run command */
+    if (i2c_write(RTC_DEV_WRITE,buf,2))
+    {
+        ret = -1;
+    }
+
+    i2c_end();
+    return ret;
+}
+
+
+int rtc_read(unsigned char address)
+{
+    int value = -1;
+    unsigned char buf[1];
+
+    i2c_begin();
+    
+    buf[0] = address;
+
+    /* send run command */
+    if (i2c_write(RTC_DEV_READ,buf,1) >= 0)
+    {
+        i2c_start();
+        i2c_outb(RTC_DEV_READ);
+        if (i2c_getack())
+        {
+            value = i2c_inb(1);
+        }
+    }
+
+    i2c_end();
+    return value;
+}
+
+#endif
-- 
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