Programming Softconfig Switches - Analog Devices ADSP-CM403F EZ-KIT Lite Manual

Software-Controlled Switches (SoftConfig)
Table 2-1. Default ADSP-CM403F Processor Interface Availability
Interface
UART0
CAN0
Push buttons
LEDs

Programming SoftConfig Switches

On the ADSP-CM403F EZ-KIT Lite, one Microchip MCP23017 device
exists. The device has the following programming characteristics:
• Each switch has two programmable GPIO registers.
GPIO Register
GPIOA
GPIOB
• Each GPIO register controls eight signals (software switches).
• 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
2-8
Availability by Default
RS-232 , and
RX TX RTS
functionality.
Enabled in hardware, disabled in software to use
Enabled
Enabled
Register Address
0x12
0x13
0x00
0x01
ADSP-CM403F EZ-KIT Lite Evaluation System Manual
enabled by default. SoftConfig required for other
as Outputs
0
0
.
LED1