Status Leds; Mode Switch; Low Level Programming - PC Engines ALIX.2 Series Manual

Status LEDs

Status LEDs are all turned on by the BIOS on power up. The BIOS will turn off LEDs 2 and 3
before booting the operating system.
Location
LED1 (left)
LED2 (middle)
LED3 (right)
The CS5536 GPIO ports are programmed by 32 bit atomic writes. This avoids the need for read /
modify / write operations and the locking issues they entail. For example, to turn off LED1 (high),
write 0000'0040h to port 06100h. To turn on LED1 (low), write 0040'0000h. Multiple port bits can
be changed at the same time.
On ALIX.6, please note that LED3# is driven by the miniPCI express card by default. GPIO27
controls the W_DIS# radio inhibit signal instead. Drive low (0) to inhibit, high (1) to enable the
miniPCI express radio.

Mode switch

The mode switch can be accessed by software as follows:
Location
MODESW#

Low level programming

Please see www.pcengines.ch/file/alixllc.zip
ALIX system board
GPIO read port
G6 port 06100h bit 6
G25 port 06180h bit 9
G27 port 06180h bit 11
GPIO read port
G24 port 061b0h bit 8
for sample code.
20
write port
port 06100h bit 6 / 22
port 06180h bit 9 / 25
port 06180h bit 11 / 27
(active low, 0 = switch pressed)
5/5/2010