Add wait for charging capacitance of ADC S/H

diff --git a/keyboard/hhkb_rn42/rn42/battery.c b/keyboard/hhkb_rn42/rn42/battery.c
index 34aa18446c48c04f7e83dde948474ce28203e096..7e868c9646fd4f9cab1747e58db1c20f19b4f1dd 100644 (file)
--- a/keyboard/hhkb_rn42/rn42/battery.c
+++ b/keyboard/hhkb_rn42/rn42/battery.c
@@ -92,6 +92,7 @@ uint16_t battery_voltage(void)
 
     volatile uint16_t bat;
     ADCSRA |= (1<<ADEN);
+    _delay_ms(1);   // wait for charging S/H capacitance
 
     ADCSRA |= (1<<ADSC);
     while (ADCSRA & (1<<ADSC)) ;