Softconfig On The Board; Programming Softconfig Switches - Analog Devices EV-21569-SOM Manual

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Figure 3-5: Example of a Mechanical Switch (Equivalent to Example of Bus Switch)

SoftConfig on the Board

Two Microchip MCP23017 GPIO expanders provide control for individual electronic switches. The TWI2 inter-

face of the processor communicates with the Microchip devices. There are individual switches with default settings

that enable basic board functionality.

The Default Processor Interface Availability table lists the processor and board interfaces that are available by de-

fault. Note that only interfaces affected by software switches are listed in the table.

Table 3-1: Default Processor Interface Availability

Interface

UART0

SPI Flash

LEDs

On the board, two Microchip MCP23017 devices exist. Each of these devices has the following programming char-

acteristics:

• Each GPIO register controls eight signals (software switches).

GPIO Register

GPIOA

EV-21569-SOM

Manual

Availability by Default

USB to UART FTDI232RQ

Quad mode enabled

Enabled

Software-Controlled Switches (SoftConfig)

0x12

3–5

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