Eurotech ReliaGATE 10-14 Series, User Manual

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12 How to use the interfaces in Linux ReliaGATE 10-14 User manual Rev. 0-10
12.2 How to use the GPIOs: the GPIO Utility
The ReliaGATE 10-14 includes the
gpio_utility
which provides a more convenient way to drive many
of the GPIO functions from the command line:
gpio_utility pin_name function
pin_name It is the required GPIO line in the format
gpioN
or
gpioBank_Pin
.
function It may be set as follows:
0 or 1 to set the state of a GPIO output
In or Out to set the direction of a GPIO
Unexport to release the GPIO from sysfs (not normally required)
The GPIOs are exported by default at start-up.
12.3 How to drive the LED Indicators
The ReliaGATE 10-14 includes 4 LEDs which are available for use in application programs. These LEDs
are provided by GPIO lines which are available through the
sysfs interface.
The table below shows the GPIO line and color associated with each LED:
LED # GPIO Color
1 108 Green
2 109 Green
3 110 Amber
4 111 Amber
EXAMPLES:
To turn ON LED 1, enter the following command:
gpio_utility gpio108 1
To turn OFF LED 1, enter the following command:
gpio_utility gpio108 0
To read the status of LED 1, enter the following command:
gpio_utility gpio108
The current state of the LED is determined by reading the associated GPIO.
The output is as follows:
l
If LED 1 is ON, then
gpio108
= 1
l
If LED 1 is OFF, then
gpio108
= 0
For more information see: "General Purpose IO" on the previous page .
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