Analog Devices ADSP-BF609 EZ-KIT Lite Manual page 51

• By default, the Microchip MCP23017 GPIO signals function as
input signals.
The signals must be programmed as output signals to override their
default values. The following table shows the Microchip register
addresses and the values that must be written to them to program
the signals as output signals.
IODIR Register IODIR Register Address Value to be Written to Program Signals
IODIRA
IODIRB
Each of the examples in Cross Core Embedded Studio include source files
that program the soft switches, even if the default settings are being used.
The for each example identifies only the signals that are being
README
changed from their default values. The code that programs the soft
switches is located in the
The following tables
default values for each of the three Microchip MCP23017 devices.
2
Table 2-2. I C Hardware Address 0x21
GPIO MCP23017 Register Address
GPIOA
GPIOB
2
Table 2-3. I C Hardware Address 0x22
GPIO MCP23017 Register Address
GPIOA
GPIOB
ADSP-BF609 EZ-KIT Lite Evaluation System Manual
ADSP-BF609 EZ-KIT Lite Hardware Reference
0x00
0x01
SoftConfig_BF609.c
(Table 2-2, Table
0x12
0x13
0x12
0x13
as Outputs
0
0
file in each example.
2-3, and Table 2-4) outline the
Default Value
0x07
0xFC
Default Value
0x0A
0x00
2-9