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Fix typo in LED page

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Gauthier Provost 2018-12-07 12:38:47 +08:00
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docs/led.md
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@ -14,12 +14,12 @@
| LED8 | Green | No | Power indicator |
!!! info
LED1 - LED7 is preconfigured for certain indicator under Linux, see [LED under Linux](#led-under-linux)
LED1 - LED7 is preconfigured for certain indicator under Linux, see [LED under Linux](#led-under-linux) section.
## Expansion Panel (J18)
Helios4 board was designed to either use the on-board LEDs or use a custom expansion panel (not-available).
If you wish to use the header insure to switch to OFF the DIP switch SW2.
If you wish to use the header, insure to switch to OFF the Dip Switch SW2.
![Dipswitch LED](/img/led/dipswitch_led_off.png)
@ -41,12 +41,12 @@ If you wish to use the header insure to switch to OFF the DIP switch SW2.
| 10 | - | GND |
!!! info
LED1 - LED7 is preconfigured for certain indicator under Linux, see [LED under Linux](#led-under-linux)
LED1 - LED7 is preconfigured for certain indicator under Linux, see [LED under Linux](#led-under-linux) section.
### Wiring Diagram
Since the signals to control the LEDs are active low, connect the pin to LED's cathode.
Below is example of the wiring diagram.
Below a wiring diagram example.
![Wiring Example](/img/led/led_expansion_wiring_diagram.png)
@ -64,10 +64,9 @@ Below is example of the wiring diagram.
| LED7 | helios4:green:usb | usb-host | Blinking on USB activity, any port |
!!! note
**ata* ** trigger requires additional patch to mainline kernel. The patch can be found from
[here](/files/led/libata_leds_trigger_mvebu.patch) and is not needed for Armbian.
**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.
The LEDs can be accessed under leds class in sysfs.
The LEDs can be accessed under LEDs class in *sysfs*.
```
root@helios4:~/# ls -l /sys/class/leds/
@ -91,16 +90,16 @@ More info see [Configuring LED trigger](#configuring-led-trigger).
- heartbeat
LED "double" flashes at a load average based rate. The interval might changed during high load.
If the LED no longer blink, that is mean the system lock-up or hung and has to be reset'd.
LED "double" flashes at a load average based rate. The interval might change during heavy load.
If the LED no longer blinks, it means the system is locked-up or hung and has to be reset.
- ataN
- ata*N*
LED blink on any read/write activity at specific SATA port.
LED blinks on any read/write activity at specific SATA port.
- usb-host
LED blink on USB activity at any port.
LED blinks on USB activity at any port.
- panic
@ -108,35 +107,33 @@ This trigger allows LEDs to be configured to blink on a kernel panic.
- timer
This allows LEDs to be controlled by a programmable timer via sysfs. delay_on to set how long
the led turned on and delay_off to set how long the led turned off.
This allows LEDs to be controlled by a programmable timer via *sysfs*. delay_on to set how long
the LED turned on and delay_off to set how long the LED turned off.
### Configuring LED trigger
To configure, simply set the trigger type. For example to set status led triggered by timer
To configure, simply set the trigger type. For example to set Status LED triggered by timer
```
echo timer | sudo tee -a /sys/class/leds/helios4\:green\:status/trigger
```
and done.
Some of the triggers may expose additional parameters that can be configured further.
Some of the trigger may exposed additional parameter than can be configured further.
On **none** trigger, to turn on the LED set the brightness bigger than 0.
On **none** trigger, to turn ON the LED set the brightness bigger than 0.
```
echo 1 | sudo tee -a /sys/class/leds/helios4\:green\:status/brightness
```
and to turn off the LED set the brightness to 0.
and to turn OFF the LED set the brightness to 0.
```
echo 0 | sudo tee -a /sys/class/leds/helios4\:green\:status/brightness
```
On **timer** trigger, it will exposed *delay_on* and *delay_off* with default value both 0.5 seconds.
On **timer** trigger, it will exposed *delay_on* and *delay_off* with default value of 0.5 seconds for both.
To change the delay, set the respective parameter (value in milliseconds)
```
@ -153,9 +150,7 @@ While other LEDs are preconfigured, the fault LED remains unconfigured (trigger:
#### 1. As Kernel Panic Indicator
To configure the LED as Kernel panic indicator, set the trigger to **panic**.
However, this functionality might be redundant with status LED. If the status LED no longer blinking,
that mean the system is hung which can be translated into kernel panic occurred.
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.
To trigger kernel panic to test the LED, run
```
@ -165,9 +160,9 @@ echo c > /proc/sysrq-trigger
!!! warning
Triggering kernel panic can lead to data loss. Use with caution!
#### 2. As MDADM Fault Indicator
#### 2. As RAID Fault Indicator
To configure the LED as MDADM fault indicator, please refer to [MDADM: Configure Fault LED](/mdadm/#configure-fault-led)
To configure the LED as RAID fault indicator, please refer to [MDADM: Configure Fault LED](/mdadm/#configure-fault-led)
!!! info
On Armbian, this is the default setting for fault LED.
!!! note
On Armbian builds, this is the default setting for fault LED.