luckfox-pico/project/cfg/BoardConfig_IPC/overlay/overlay-luckfox-buildroot-init/etc/init.d/S60micinit

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#!/bin/sh
[ -f /etc/profile.d/RkEnv.sh ] && source /etc/profile.d/RkEnv.sh
case $1 in
start)
if command -v amixer >/dev/null 2>&1; then
amixer set 'ADC ALC Left' 26 > /dev/null 2>&1
amixer set 'ADC ALC Right' 26 > /dev/null 2>&1
amixer set 'ADC MIC Left Gain' 3 > /dev/null 2>&1
amixer set 'ADC MIC Right Gain' 3 > /dev/null 2>&1
amixer set 'ADC MICBIAS Voltage' 'VREFx0_975' > /dev/null 2>&1
amixer set 'ADC Mode' 'SingadcL' > /dev/null 2>&1
fi
;;
*)
exit 1
;;
esac