UNICA SBC/Interfaces and Connectors/Leds and buttons
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Contents
Led and buttons connector[edit | edit source]
Description[edit | edit source]
UNICA SBC has three LEDs and three buttons that can be used at the user-space level: with special mounting options, they can be connected to SOM's GPIOs and drive them by software.
Signals[edit | edit source]
As a default mounting option, some of them are connected to dedicated signals.
| Led# | SOM SO-DIMM pin # | Default function |
|---|---|---|
| DL3 | (optional) 37
I/O expander P00 |
led0 (*) |
| DL4 | (optional) 34
I/O expander P01 |
led1 (*) |
| DL5 | - | 3V3 carrier board power monitor |
(*) led0 and led1 labels in sysfs
The three buttons are connected - by default - to the main SoC power and reset signals. The following table describes the interface signals:
| Button# | Default function | SO-DIMM pin# (option) |
|---|---|---|
| S2 | Cold reset | 32 |
| S3 | Warm reset | 126 |
| S4 | OnOff - standby | 39 |
Device mapping[edit | edit source]
The leds are mapped to a sysfs led class interface.
led0can be accessed through/sys/class/leds/led0/brightnesssysfs interfaceled1is enabled as heartbeat funtion in the device tree
The buttons are mapped to the input event device handler.
Device usage[edit | edit source]
The LEDs can be manipulated via /sys/class/leds/ syfs interface
