View source for RSB-3730 GPIO


The IMX8MM bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>".<br/> The numeric value of GPIO is calculated as follows:
<pre>gpio_bit : 0~31 E.g. GPIO5_22 becomes 150</pre>

“GPIO11” and “GPIO12” can be controlled by the CPU or by the i2c extended gpio&nbsp;based on the high and low levels of “GPIO_SELECT”.

[[File:RSB-3730 GPIO.png]]

Export GPIO then you can use control GPIO from user space through sysfs.<br/> The node numbers of the exported gpio are consistent with the export order, increasing&nbsp;from 1.<br/> '''Export GPIO1'''
<pre> # echo 150> /sys/class/gpio/export</pre>

'''Set GPIO direction to in/out'''
<pre> # echo "out" > /sys/class/gpio/gpio1/direction</pre>

'''Set GPIO value 0/1 if GPIO pin define is output'''
<pre> # echo 1 > /sys/class/gpio/gpio1/value</pre>

'''Get GPIO value'''
<pre> # cat /sys/class/gpio/gpio1/value</pre>