SCAS290 datasheet(49/53 Pages) TI

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GPIO Capability

The return packet is:

[0] 0x21

[1] 0xA0

[2] 0x02

[3] 0x05

[4] 0xAA

[5] 0x55

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

G.2

GPIO Capability

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 11):

Table 11. 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 can also read back from the GPIO to see the state of the pins. Assume the previous example

was just written 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 is:

[0] 0x28

[1] 0x00

[2] 0x01

[3] 0x00

[4] 0x40

G.3

Writing Scripts

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

Each line in a script file is one command. No provision is made for extending lines beyond one line, except

for the > command. A line is terminated by a carriage return.

The first character of a line is the command. Commands are:

Set interface bus to use

Read from the serial control bus

Write to the serial control bus

Extend repeated write commands to lines below a w

Comment

Break

Delay

Wait for Flag

SLAU266A – October 2008 – Revised October 2012

USB-MODEVM Protocol

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