IO

Definition

Main Module - Core-3588JD4

Name	GPIO Number	IO Type
IO1	36	INPUT
IO2	102	INPUT
IO3	44	INPUT
IO4	38	INPUT
IO5	137	OUTPUT(relay)

Use

For example, to operate 486, you need:

1. Export the GPIO, run as root user:

   echo 486 > /sys/class/gpio/export
   

2. Operate GPIO, set to read input or output specified value:

   cd /sys/class/gpio/gpio486
   # set input mode
   echo in > direction
   cat value
   
   # set output mode
   echo out > direction
   # output low level
   echo 0 > value
   # output high level
   echo 1 > value
   

There are a few things to note:

• If the GPIO has been applied by other drivers, it cannot be exported successfully, and subsequent read and write operations cannot be performed.

• Involving the multiplexing of IO functions, if the function of the pin is already GPIO, the above method can be used; otherwise, the pinctrl state must be specified in the device tree.