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== '''Configuration''' ==

The RK3399 bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>" 

The numeric value of GPIO is calculated as follows:
<pre>32 x (gpio_bank) + gpio_bit
</pre>

gpio_bit : A0～A7 0-7 B0～B7 8-15 C0～C7 16-23 D0～D7 24-31

E.g. GPIO2_B0 becomes 72

== '''RSB-4710''' ==

{| border="1" cellpadding="1" cellspacing="1" style="width: 500px;"
|-
| '''GPIO Number'''
| '''GPIO Formed'''
| '''Numeric Representation'''
|-
| GPIO1
| GPIO2_B0
| 72
|-
| GPIO2
| GPIO1_C2
| 50
|-
| GPIO4
| GPIO3_D4
| 124
|-
| GPIO5
| GPIO4_A4
| 132
|-
| GPIO6
| GPIO0_B0
| 8
|}

== '''TEST''' ==

'''Export GPIO in order to use control GPIO from the user space through sysfs.'''

Export GPIO1.
<pre>$ echo 72 > /sys/class/gpio/export</pre>

Set GPIO direction to in/out.
<pre>$ echo "out" > /sys/class/gpio/gpio72/direction</pre>

Set GPIO value 0/1 if GPIO pin define is output.
<pre>$ echo 1 > /sys/class/gpio/gpio72/value</pre>

Used as IRQ signal

Note:You have to configure GPIO to input
<pre>$ echo "rising" > /sys/class/gpio/gpio72/edge
</pre>

*rising: Trigger on rising edge 
* falling: Trigger on falling edge
* both: Trigger on both edges
* none: Disable interrupt on both edges

Unexport GPIO1.
<pre>$ echo 72 > /sys/class/gpio/unexport</pre>

'''GPIO 1 and GPIO 2 are taken as an example:'''

*Connect GPIO 1 and GPIO 2.
*Export GPIO 1 and GPIO 2.
<pre>$ echo 72 > /sys/class/gpio/export
$ echo 50 > /sys/class/gpio/export</pre>

*Set GPIO 1 to output.
<pre>$ echo "out" > /sys/class/gpio/gpio72/direction
</pre>

*Set GPIO 2 to input
<pre>$ echo "in" > /sys/class/gpio/gpio50/direction
</pre>

*Change GPIO 1 to 1 and read GPIO 2 value
<pre>$ echo 1 > /sys/class/gpio/gpio72/value
$ cat /sys/class/gpio/gpio50/value
1
</pre>

*Change GPIO 1 to 0 and read GPIO 2 value
<pre>$ echo 0 > /sys/class/gpio/gpio72/value
$ cat /sys/class/gpio/gpio50/value
0</pre>

How to use GPIO for RSB-4710 - Revision history

Xingxing.li: Created page with " == '''Configuration''' == The RK3399 bank/bit notation for GPIOs must be formed as "GPIO_" The numeric value of GPIO is calculated..."