Clipv2/Clip+ : use CHG_IN adc channel, it seems to work better than BVDD and RTCSUP

They're all the same when charger is unplugged, but when it's plugged:
- BVDD is way too high
- RTCSUP oscillates between 2 values
- CHG_IN acts like RTCSUP on some models but seems to works fine on my Clip+

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25405 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 5 insertions, 3 deletions

diff --git a/firmware/target/arm/as3525/powermgmt-target.h b/firmware/target/arm/as3525/powermgmt-target.h
index 511bcc7085..cc7441fe5a 100644
--- a/firmware/target/arm/as3525/powermgmt-target.h
+++ b/firmware/target/arm/as3525/powermgmt-target.h
@@ -35,9 +35,11 @@
 #if defined(SANSA_CLIP)
 #define ADC_BATTERY         ADC_BVDD
 #else
-/* ADC_RTCSUP seems to represent battery voltage better than ADC_BVDD during
- * charging (ADC_BVDD is way too high) and appears the same in normal use. */
-#define ADC_BATTERY         ADC_RTCSUP
+/* ADC_CHG_IN seems to represent battery voltage better than ADC_BVDD during
+ * charging (ADC_BVDD is way too high) and appears the same in normal use.
+ * Note that when charging some models do not give an accurate reading but jump
+ * between 2 values. */
+#define ADC_BATTERY         ADC_CHG_IN
 #endif
 
 #elif defined(SANSA_E200V2)