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G.2

GPIO Capability

G.3

Writing Scripts

GPIO Capability

The return packet should be

[0]

0x21

[1]

0xA0

[2]

0x02

[3]

0x05

[4]

0xAA

[5]

0x55

assuming that the values we wrote above starting at Register 5 were actually written to the device.

The USB-MODEVM has seven GPIO lines. Access them by specifying the interface to be 0x08, and then

using the standard format for packets—but addresses are unnecessary. The GPIO lines are mapped into

one byte (see Table G-3):

Table G-3. GPIO Pin Assignments

Bit 7

P3.5

P3.4

P3.3

P1.3

P1.2

P1.1

P1.0

Example: write P3.5 to a 1, set all others to 0:

[0]

0x18

--> write, GPIO

[1]

0x00

--> this value is ignored

[2]

0x01

--> length - ALWAYS a 1

[3]

0x00

--> this value is ignored

[4]

0x40

--> 01000000

The user may also read back from the GPIO to see the state of the pins. Let's say we just wrote the

previous example to the port pins.

Example: read the GPIO

[0]

0x08

--> read, GPIO

[1]

0x00

--> this value is ignored

[2]

0x01

--> length - ALWAYS a 1

[3]

0x00

--> this value is ignored

The return packet should be:

[0]

0x28

[1]

0x00

[2]

0x01

[3]

0x00

[4]

0x40

A script is simply a text file that contains data to send to the serial control buses. The scripting language is

quite simple, as is the parser for the language. Therefore, the program is not very forgiving about mistakes

made in the source script file, but the formatting of the file is simple. Consequently, mistakes should be

rare.

USB-MODEVM Protocol

SLAU218 – August 2007

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