Using Leds And Push Buttons - Analog Devices ADSP-21262 EZ-KIT Lite Manual

Using LEDs and Push Buttons

Using LEDs and Push Buttons
2-6
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The EZ-KIT Lite has eight general-purpose user LEDs and four gen-
eral-purpose push buttons.
Two of the general-purpose push buttons are attached to the DSP's
pins, while the other two are attached to the DAI pins. All of the push
buttons connect to the DSP through a DIP switch. The DIP switch allows
DSP pins, which connect to the push buttons, to be disconnected. See
"Push Button Enable Switch (SW9)" on page 3-10
how to disable the push buttons from driving the corresponding DSP pin.
The value of the push buttons connected to the
mined by reading the
FLAG
DAI pins must be configured as interrupts. It is necessary to set up an
interrupt routine to determine each pin's state.
push button connects to the DSP. Refer to the related example program
shipped with the EZ-KIT Lite for more information.
Table 2-2. Push Button Connections
Push Button Reference Designator
SW1
SW2
SW3
SW4
The LEDs are connected to the parallel port pins,
parallel port of the DSP can be set up as a memory bus or as general-pur-
pose pins. The latch allows the LEDs to be written to in both cases.
FLAG
Information about setting up the latch can be found in
Enable Switch (SW8)" on page
ADSP-21262 EZ-KIT Lite Evaluation System Manual
FLAG
register. The push buttons connected to the
Table 2-2
DSP Pin
FLAG1
FLAG2
DAI19
DAI20
AD7–0
3-10.
FLAG
for instructions on
pins can be deter-
shows how each
, via a latch. The
"SPDIF Signal