summaryrefslogtreecommitdiff
path: root/keyboard/hhkb_rn42/rn42/battery.c
diff options
context:
space:
mode:
Diffstat (limited to 'keyboard/hhkb_rn42/rn42/battery.c')
-rw-r--r--keyboard/hhkb_rn42/rn42/battery.c20
1 files changed, 7 insertions, 13 deletions
diff --git a/keyboard/hhkb_rn42/rn42/battery.c b/keyboard/hhkb_rn42/rn42/battery.c
index 0320e1baf1..7e868c9646 100644
--- a/keyboard/hhkb_rn42/rn42/battery.c
+++ b/keyboard/hhkb_rn42/rn42/battery.c
@@ -20,7 +20,10 @@ void battery_init(void)
// Ref:2.56V band-gap, Input:ADC0(PF0), Prescale:128(16MHz/128=125KHz)
ADMUX = (1<<REFS1) | (1<<REFS0);
ADCSRA = (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0);
- ADCSRA |= (1<<ADEN);
+ // digital input buffer disable(24.9.5)
+ DIDR0 = (1<<ADC0D) | (1<<ADC4D) | (1<<ADC7D);
+ DIDR1 = (1<<AIN0D);
+ DIDR2 = (1<<ADC8D) | (1<<ADC9D) | (1<<ADC11D) | (1<<ADC12D) | (1<<ADC13D);
// ADC disable voltate divider(PF4)
DDRF |= (1<<4);
@@ -88,23 +91,14 @@ uint16_t battery_voltage(void)
PORTF |= (1<<4);
volatile uint16_t bat;
- //ADCSRA |= (1<<ADEN);
-
- // discard first result
- ADCSRA |= (1<<ADSC);
- while (ADCSRA & (1<<ADSC)) ;
- bat = ADC;
-
- // discard second result
- ADCSRA |= (1<<ADSC);
- while (ADCSRA & (1<<ADSC)) ;
- bat = ADC;
+ ADCSRA |= (1<<ADEN);
+ _delay_ms(1); // wait for charging S/H capacitance
ADCSRA |= (1<<ADSC);
while (ADCSRA & (1<<ADSC)) ;
bat = ADC;
- //ADCSRA &= ~(1<<ADEN);
+ ADCSRA &= ~(1<<ADEN);
// ADC disable voltate divider(PF4)
DDRF |= (1<<4);