correct battery readout for m200v4. Percentage is still uncalibrated.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19420 a1c6a512-1295-4272-9138-f99709370657

firmware/SOURCES

@@ -1095,7 +1095,7 @@ target/arm/as3525/powermgmt-as3525.c
 target/arm/lcd-ssd1815.c
 target/arm/as3525/sansa-m200v4/button-m200v4.c
 #ifndef BOOTLOADER
-target/arm/as3525/powermgmt-as3525.c
+target/arm/as3525/sansa-m200v4/powermgmt-m200v4.c
 drivers/generic_i2c.c
 target/arm/as3525/fmradio-i2c-as3525.c
 #endif /* !BOOTLOADER */

firmware/target/arm/as3525/sansa-m200v4/powermgmt-m200v4.c

@@ -0,0 +1,59 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright © 2008 Rafaël Carré
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "adc.h"
+#include "adc-target.h"
+#include "powermgmt.h"
+
+/* TODO
+  early uncalibrated values. But read-out value should be correct
+ */
+
+const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
+{
+    /* TODO: this is just an initial guess */
+    900
+};
+
+const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
+{
+    /* TODO: this is just an initial guess */
+    1000
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
+const unsigned short percent_to_volt_discharge[BATTERY_TYPES_COUNT][11] =
+{
+    /* TODO: simple uncalibrated curve, linear except for first 10% */
+    { 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500 }
+};
+
+/* ADC should read 0x3ff=5.12V */
+#define BATTERY_SCALE_FACTOR 2562       
+/* full-scale ADC readout (2^10) in millivolt */
+
+/* Returns battery voltage from ADC [millivolts] */
+unsigned int battery_adc_voltage(void)
+{
+    return (adc_read(ADC_VBAT) * BATTERY_SCALE_FACTOR) >> 10;
+}
+