USB-TO-GPIO datasheet(37/50 Pages) TI1

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A.1

Host PC to USB Interface Adapter Commands

Appendix A

SLLU093 – August 2006

Lists of Communication Protocol

This appendix contains a list of communication commands that can be sent from a host

PC to the USB interface adapter, as well as a list of communication commands that

can be sent from the USB interface adapter to the host PC.

USB

PACKET

USB

COMMAND

USB PACKET

BYTE 0

PACKET

COMMENTS

DESCRIPTION

BYTES 6-63

COMMAND

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

CODE

Firmware

0x00

See Chapter 4

Version

C number of bytes (from 1 up to

0x14

I2C Write

60 bytes) to write

D (from 1 to

0x15

I2C Read

62 bytes)

B does not

A (bit.x=1 for

apply to port 0

Read/Write

read/input,

B (byte to

read. Each

0x16

Port 0

bit.x=0 for

write)

GPIO can be

write/output)

configured as

input or output.

EEPROM

A = Starting

B = Starting

C (# of bytes

Data to be programmed into EEPROM

0x18

Program

address MSB

address LSB

to program)

(up to 32 bytes)

A = Starting

B = Starting

C (# of bytes

EEPROM Read

0x19

≤ 60

address MSB

address LSB

to program)

0x00 for no

pullups (switch

off), 0x01 for

2.2 k

Ω, 0x02

Set Pullup

C (for

for 1 k

Ω, 0x03

0x1A

A (for SDA)

B (for SCL)

Resistors

ALERT)

for 688

Ω. For

ALERT, the

option is either

open (0x00) or

2.2 k

Ω (0x01).

A (0 for

Set

100 kHz,

0x1B

I2C/PMBUS/SM

otherwise

BUS Speed

400 kHz)

The first byte of

data to write is

Generic I2C

0x1C

A number of bytes (from 2 up to 62) to write

usually (device

Write

address << 1) +

write bit 0.

X # of

Y = 1st

bytes

The first byte of

byte to

(1 to 62)

data to write is

write +

Generic I2C

0x1D

A number of bytes (2 to 60) to write

to read

usually (device

read bit 1

Read

back

address << 1) +

USB

write bit 0.

Byte 62

Byte 63

SLLU093 – August 2006

Lists of Communication Protocol

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