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If you want to control battery charging through GPIO, please refer to the instructions below:
<pre style="color:red">
"CHG Ctrl" - '''Short''' : battery automatic charging when powe adapter connected
"CHG Ctrl" - '''Open''' : GPIO16 output stays high: Charging enabled, GPIO16 output stays low : Charging disabled
</pre>
<pre style="color:blue">
# Sample shell command
echo "16" > /sys/class/gpio/export