RTC support for Sansa.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12185 a1c6a512-1295-4272-9138-f99709370657

firmware/SOURCES

@@ -138,6 +138,8 @@ drivers/rtc/rtc_pcf50605.c
 drivers/rtc/rtc_e8564.c
 #elif (CONFIG_RTC == RTC_S3C2440)
 drivers/rtc/rtc_s3c2440.c
+#elif (CONFIG_RTC == RTC_AS3514)
+drivers/rtc/rtc_as3514.c
 #endif /* (CONFIG_RTC == RTC_) */
 #endif /* SIMULATOR */
 

firmware/drivers/rtc/rtc_as3514.c

@@ -0,0 +1,165 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: rtc_as3514.c 12131 2007-01-27 20:48:48Z dan_a $
+ *
+ * Copyright (C) 2007 by Barry Wardell
+ *
+ * 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 "i2c-pp.h"
+#include <stdbool.h>
+
+#define MINUTE_SECONDS      60
+#define HOUR_SECONDS        3600
+#define DAY_SECONDS         86400
+#define WEEK_SECONDS        604800
+#define YEAR_SECONDS        31536000
+#define LEAP_YEAR_SECONDS   31622400
+
+#define BCD2DEC(X)          (((((X)>>4) & 0x0f) * 10) + ((X) & 0xf))
+#define DEC2BCD(X)          ((((X)/10)<<4) | ((X)%10))
+
+/* Days in each month */
+static unsigned int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+static inline bool is_leapyear(int year)
+{
+    if( ((year%4)==0) && (((year%100)!=0) || ((year%400)==0)) )
+        return true;
+    else
+        return false;
+}
+
+void rtc_init(void)
+{
+}
+
+int rtc_read_datetime(unsigned char* buf)
+{
+    char tmp[4];
+    int year;
+    int i;
+    unsigned int seconds;
+    
+    /* RTC_AS3514's slave address is 0x46*/
+    for (i=0;i<4;i++){
+        tmp[i] = i2c_readbyte(0x46,0x2a+i);
+    }
+    seconds = tmp[0] + (tmp[1]<<8) + (tmp[2]<<16) + (tmp[3]<<24);
+    
+    /* Convert seconds since Jan-1-1980 to format compatible with
+     * get_time() from firmware/common/timefuncs.c */
+    
+    /* weekday */
+    buf[3] = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 1) % 7;
+    
+    /* Year */
+    year = 1980;
+    while(seconds>=LEAP_YEAR_SECONDS)
+    {
+        year++;
+        
+        if(is_leapyear(year)){
+            seconds -= LEAP_YEAR_SECONDS;
+        } else {
+            seconds -= YEAR_SECONDS;
+        }
+    }
+    
+    if(is_leapyear(year)) {
+        days_in_month[1] = 29;
+    } else {
+        days_in_month[1] = 28;
+        if(seconds>YEAR_SECONDS){
+            year++;
+            seconds -= YEAR_SECONDS;
+        }
+    }
+    buf[6] = year%100;
+    
+    /* Month */
+    for(i=0; i<12; i++)
+    {
+        if(seconds < days_in_month[i]*DAY_SECONDS){
+            buf[5] = i+1;
+            break;
+        }
+        
+        seconds -= days_in_month[i]*DAY_SECONDS;
+    }
+    
+    /* Month Day */
+    buf[4] = seconds/DAY_SECONDS;
+    seconds -= buf[4]*DAY_SECONDS;
+
+    /* Hour */
+    buf[2] = seconds/HOUR_SECONDS;
+    seconds -= buf[2]*HOUR_SECONDS;
+    
+    /* Minute */
+    buf[1] = seconds/MINUTE_SECONDS;
+    seconds -= buf[1]*MINUTE_SECONDS;
+    
+    /* Second */
+    buf[0] = seconds;
+    
+    /* Convert to Binary Coded Decimal format */
+    for(i=0; i<7; i++)
+        buf[i] = DEC2BCD(buf[i]);
+    
+    return 7;
+}
+
+int rtc_write_datetime(unsigned char* buf)
+{
+    int i, year;
+    unsigned int year_days = 0;
+    unsigned int month_days = 0;
+    unsigned int seconds = 0;
+    
+    /* Convert from Binary Coded Decimal format */
+    for(i=0; i<7; i++)
+        buf[i] = BCD2DEC(buf[i]);   
+
+    year = 2000 + buf[6];
+
+    if(is_leapyear(year)) {
+        days_in_month[1] = 29;
+    } else {
+        days_in_month[1] = 28;
+    }
+    
+    /* Number of days in months gone by this year*/
+    for(i=0; i<(buf[5]-1); i++){
+        month_days += days_in_month[i];
+    }
+    
+    /* Number of days in years gone by since 1-Jan-1980 */
+    year_days = 365*(buf[6]+20) + buf[6]/4 + 6;
+
+    /* Convert to seconds since 1-Jan-1980 */
+    seconds = buf[0]
+            + buf[1]*MINUTE_SECONDS
+            + buf[2]*HOUR_SECONDS
+            + buf[4]*DAY_SECONDS
+            + month_days*DAY_SECONDS
+            + year_days*DAY_SECONDS;
+
+    /* Send data to RTC */
+    for (i=0;i<4;i++){
+        pp_i2c_send(0x46, 0x2a+i,((seconds>>(8*i)) & 0xff));
+    }
+    return 1;
+}
+

firmware/export/config-e200.h

@@ -37,7 +37,7 @@
 
 /* define this if you have a real-time clock */
 #ifndef BOOTLOADER
-#define CONFIG_RTC RTC_E8564  /* TODO: figure this out */
+#define CONFIG_RTC RTC_AS3514
 #endif
 
 /* Define this if you have a software controlled poweroff */

firmware/export/config.h

@@ -151,6 +151,7 @@
 #define RTC_PCF50606 3 /* iriver H300 */
 #define RTC_S3C2440  4
 #define RTC_E8564    5 /* iriver H10 */
+#define RTC_AS3514   6 /* Sandisk Sansa e200 series */
 
 /* USB On-the-go */
 #define USBOTG_ISP1362 1362