168 lines
5.9 KiB
Markdown
168 lines
5.9 KiB
Markdown
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## On-Board LEDs
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| LED number | Color | Software control | Remarks |
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|------------|-------|------------------|---------|
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| LED1 | Green | Yes | Active-low |
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| LED2 | Red | Yes | Active-low |
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| LED3 | Green | Yes | Active-low |
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| LED4 | Green | Yes | Active-low |
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| LED5 | Green | Yes | Active-low |
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| LED6 | Green | Yes | Active-low |
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| LED7 | Green | Yes | Active-low |
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| LED8 | Green | No | Power indicator |
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!!! info
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LED1 - LED7 is preconfigured for certain indicator under Linux, see [LED under Linux](#led-under-linux) section.
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## Expansion Panel (J18)
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Helios4 board was designed to either use the on-board LEDs or use a custom expansion panel (not-available).
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If you wish to use the header, insure to switch to OFF the Dip Switch SW2.
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### Pinout Table
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| Pin | LED number | Remarks |
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|-----|------------|---------|
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| 1 | - | 3.3V supply |
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| 2 | - | Not connected |
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| 3 | LED1 | Active-low |
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| 4 | LED2 | Active-low |
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| 5 | LED3 | Active-low |
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| 6 | LED4 | Active-low |
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| 7 | LED5 | Active-low |
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| 8 | LED6 | Active-low |
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| 9 | LED7 | Active-low |
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| 10 | - | GND |
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!!! info
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LED1 - LED7 is preconfigured for certain indicator under Linux, see [LED under Linux](#led-under-linux) section.
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### Wiring Diagram
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Since the signals to control the LEDs are active low, connect the pin to LED's cathode.
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Below a wiring diagram example.
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## LED under Linux
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| LED | Name | Default Trigger | Remarks |
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|------|----------------------|-----------------|---------|
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| LED1 | helios4:green:status | heartbeat | Blinking periodically |
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| LED2 | helios4:red:fault | none | See [Configuring Fault LED](#configuring-fault-led) |
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| LED3 | helios4:green:ata1 | ata1 | Blinking on SATA1 activity |
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| LED4 | helios4:green:ata2 | ata2 | Blinking on SATA2 activity |
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| LED5 | helios4:green:ata3 | ata3 | Blinking on SATA3 activity |
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| LED6 | helios4:green:ata4 | ata4 | Blinking on SATA4 activity |
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| LED7 | helios4:green:usb | usb-host | Blinking on USB activity, any port |
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!!! note
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**ata** trigger requires additional patch to mainline kernel. The patch can be found [here](/files/led/libata_leds_trigger_mvebu.patch). **Armbian** builds are already patched, so no action is required.
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The LEDs can be accessed under LEDs class in *sysfs*.
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```
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root@helios4:~/# ls -l /sys/class/leds/
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lrwxrwxrwx 1 root root 0 Dec 4 06:57 helios4:green:ata1 -> ../../devices/platform/io-leds/leds/helios4:green:ata1
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lrwxrwxrwx 1 root root 0 Dec 4 06:57 helios4:green:ata2 -> ../../devices/platform/io-leds/leds/helios4:green:ata2
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lrwxrwxrwx 1 root root 0 Dec 4 06:57 helios4:green:ata3 -> ../../devices/platform/io-leds/leds/helios4:green:ata3
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lrwxrwxrwx 1 root root 0 Dec 4 06:57 helios4:green:ata4 -> ../../devices/platform/io-leds/leds/helios4:green:ata4
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lrwxrwxrwx 1 root root 0 Dec 4 06:57 helios4:green:status -> ../../devices/platform/system-leds/leds/helios4:green:status
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lrwxrwxrwx 1 root root 0 Dec 4 06:57 helios4:green:usb -> ../../devices/platform/io-leds/leds/helios4:green:usb
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lrwxrwxrwx 1 root root 0 Dec 4 06:57 helios4:red:fault -> ../../devices/platform/system-leds/leds/helios4:red:fault
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```
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### LEDs Trigger
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- none
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No automatic trigger. Manually control the LED by manipulating "brightness".
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More info see [Configuring LED trigger](#configuring-led-trigger).
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- heartbeat
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LED "double" flashes at a load average based rate. The interval might change during heavy load.
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If the LED no longer blinks, it means the system is locked-up or hung and has to be reset.
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- ata*N*
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LED blinks on any read/write activity at specific SATA port.
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- usb-host
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LED blinks on USB activity at any port.
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- panic
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This trigger allows LEDs to be configured to blink on a kernel panic.
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- timer
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This allows LEDs to be controlled by a programmable timer via *sysfs*. delay_on to set how long
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the LED turned on and delay_off to set how long the LED turned off.
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### Configuring LED trigger
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To configure, simply set the trigger type. For example to set Status LED triggered by timer
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```
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echo timer | sudo tee -a /sys/class/leds/helios4\:green\:status/trigger
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```
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Some of the triggers may expose additional parameters that can be configured further.
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On **none** trigger, to turn ON the LED set the brightness bigger than 0.
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```
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echo 1 | sudo tee -a /sys/class/leds/helios4\:green\:status/brightness
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```
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and to turn OFF the LED set the brightness to 0.
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```
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echo 0 | sudo tee -a /sys/class/leds/helios4\:green\:status/brightness
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```
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On **timer** trigger, it will exposed *delay_on* and *delay_off* with default value of 0.5 seconds for both.
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To change the delay, set the respective parameter (value in milliseconds)
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```
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echo 1000 | sudo tee -a /sys/class/leds/helios4\:green\:status/delay_on
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echo 200 | sudo tee -a /sys/class/leds/helios4\:green\:status/delay_off
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```
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!!! note
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The changes is not retained across reboot. Use startup script or udev rules to make it permanent.
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### Configuring Fault LED
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While other LEDs are preconfigured, the fault LED remains unconfigured (trigger:**none**).
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#### 1. As Kernel Panic Indicator
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To configure the LED as Kernel panic indicator, set the trigger to **panic**. However this functionality might be redundant with Status LED, since if a kernel panic occurs and/or system hangs, the Status LED will no longer blink.
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To trigger kernel panic to test the LED, run
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```
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echo c > /proc/sysrq-trigger
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```
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!!! warning
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Triggering kernel panic can lead to data loss. Use with caution!
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#### 2. As RAID Fault Indicator
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To configure the LED as RAID fault indicator, please refer to [MDADM: Configure Fault LED](/mdadm/#configure-fault-led)
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!!! note
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On Armbian builds, this is the default setting for fault LED.
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