VIA Technologies ARTiGO A820, Быстрый старт

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ARTiGO A820 Linux BSP v3.2.1 Quick Start Guide
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5.8. Setting Up GPIO
The DIO port on the ARTiGO A820 consists of 9 pins. The following section explains
setting up these pins for input/output communication
DIO port diagram
5.8.1. Setting Up DIO Port for GPIO Functionality
The echo value of GPIO pins are listed below:
Pin Signal GPIO echo value
1 GPIO_7 7
2 GPIO_1 1
3 GPIO_8 8
4 GPIO_2 2
5 GPIO_9 9
6 GPIO_4 4
7 GPIO_16 203
8 GPIO_5 5
9 GND
GPIO port pinout table
Set the multifunction pin as a GPIO pin. Here is the example for GPIO pin 1:
$ echo 7 > /sys/class/gpio/export
5.8.2. Setting Up GPI Mode
To set a pin to "input" mode (GPI), use the following command (here is the example for
GPIO pin 1):
$ echo "in" > /sys/class/gpio/gpio7/directio n
To read the GPI input value, use the following command:
$ cat /sys/class/gpio/gpio203/value
5.8.3. Setting Up GPO Mode
To set a pin to “output” mode (GPO), use the following command (here is the example
for GPIO pin 1):
$ echo "out" > /sys/class/gpio/gpio7/direction
COM 1 DIO
USB
RESET
PWR
WIRELESS
485 232
DIO port
5 1
9 6