Push Buttons & LEDs
16
Push Buttons and LEDs
Two push buttons and four LEDs are integrated on the Carrier Board
serving as user input and display elements. The corresponding
Expansion Board features two additional push buttons and 5 user and
status LEDs. Push Button S2 on both the Expansion Board and the
Carrier Board serves as a reset button, push button S1 is connected
with the GPIO1 (via J15) signal on both boards and can be used freely
in the application code. The 4 programmable LEDs are controlled with
a low level over PLDs U6 and U7.
USB
OTG
MultiMediaCard
CompactFlash Card
D5
D4
D2
D1
Reset Button
GPIO Button
D3
Sound
Figure 37: Location of Push Buttons and LEDs (Expansion Board)
LED Name
Description
D1
OTG_LED
Only in conjunction with phyCORE-PXA255!
D2
MMC_LED
Bit 1 of control register 5 in PLD U7.
D3
CF_LED
Bit 0 of CF control register 0 in PLD U6.
D4
USER_LED
Bit 1 of control register 2 in PLD U7.
D5
POWER_LED
Bit 0 of control register 2 in PLD U7.
Table 52:
Expansion Board LED Functions
©
PHYTEC Meßtechnik GmbH 2006 L-668e_1
71
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