From 2015027da325e9f9b602af1f36ceeeebbcd6c78d Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Sat, 20 Sep 2014 06:12:49 +0900
Subject: Add FET swtich for battery ADC

---
 keyboard/hhkb_rn42/rn42/battery.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'keyboard/hhkb_rn42/rn42/battery.c')

diff --git a/keyboard/hhkb_rn42/rn42/battery.c b/keyboard/hhkb_rn42/rn42/battery.c
index c6988fe336..0320e1baf1 100644
--- a/keyboard/hhkb_rn42/rn42/battery.c
+++ b/keyboard/hhkb_rn42/rn42/battery.c
@@ -21,6 +21,10 @@ void battery_init(void)
     ADMUX = (1<<REFS1) | (1<<REFS0);
     ADCSRA = (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0);
     ADCSRA |= (1<<ADEN);
+
+    // ADC disable voltate divider(PF4)
+    DDRF  |=  (1<<4);
+    PORTF &= ~(1<<4);
 }
 
 // Indicator for battery
@@ -79,6 +83,10 @@ bool battery_charging(void)
 // Returns voltage in mV
 uint16_t battery_voltage(void)
 {
+    // ADC disable voltate divider(PF4)
+    DDRF  |=  (1<<4);
+    PORTF |=  (1<<4);
+
     volatile uint16_t bat;
     //ADCSRA |= (1<<ADEN);
 
@@ -98,6 +106,10 @@ uint16_t battery_voltage(void)
 
     //ADCSRA &= ~(1<<ADEN);
 
+    // ADC disable voltate divider(PF4)
+    DDRF  |=  (1<<4);
+    PORTF &= ~(1<<4);
+
     return (bat - BATTERY_ADC_OFFSET) * BATTERY_ADC_RESOLUTION;
 }
 
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