Hardware Architecture Questions:
2.6. Q - How do I access the system LEDs and what is their function?
A - User defined LEDs are PORTA lines 0-2. By default the software uses these LEDs as
follows:
LED0 - System heartbeat
LED1 - System sync LED. This LED will light when the system has synced with NTP.
LED2 - System Error LED. System errors will make this LED blink.
There are a few macros that are specific to LED control.
LEDx_light - Will light the particular LED.
LEDx_kill - Will turn off the particular LED.
LEDx_blink - Will switch status of the particular LED.
These macros are defined in the machine.h file.
Note: The LEDs that are located next to the NIC connector, are controlled by the RTL8019AS
chip.
The System Power LED is always on when power is applied to the system. It cannot be
turned off.
2.7. Q - Can the system LEDs and switches be accessed from a front panel?
A - Yes! The board can be custom ordered with no system LEDs and no switches. Instead, a
10 pin connector will be installed (right over the System LED area). As a result, the LEDs
and switches can be accessed externally, like from a front panel.
