1、板子的接口简述：
VCC ---->3.3V/5V，默认3.3V
gpio ---->gpio45
gpio ---->gpio46
gpio ---->gpio47
GND---->GND
其中gpio电压为1.8V/3.3V，可做输入/输出，默认1.8V
2、串口设置gpio
```c```c
```c
echo 45 > /sys/class/gpio/export //导出需要控制的引脚
echo out > /sys/class/gpio/gpio45/direction //设置引脚的输出echo 1 > /sys/class/gpio/gpio45/value //输出高电平
//echo 0 > /sys/class/gpio/gpio45/value echo 46 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio46/direction echo 1 > /sys/class/gpio/gpio46/value
//echo 0 > /sys/class/gpio/gpio46/value echo 47 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio47/direction echo 1 > /sys/class/gpio/gpio47/value
//echo 0 > /sys/class/gpio/gpio47/value
3、代码设置px30_android-8.1\device\rockchip\rk3326\init.rk3326.rc
write /sys/class/gpio/export 52
write /sys/class/gpio/gpio52/direction out #gpio1 C4
write /sys/class/gpio/gpio52/value 1write /sys/class/gpio/export 45
write /sys/class/gpio/gpio45/direction out #gpio1 B5
write /sys/class/gpio/gpio45/value 1write /sys/class/gpio/export 46
write /sys/class/gpio/gpio46/direction out
write /sys/class/gpio/gpio46/value 1write /sys/class/gpio/export 47
write /sys/class/gpio/gpio47/direction out
write /sys/class/gpio/gpio47/value 1