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Appendix G USB-MODEVM Protocol

G.1

USB-MODEVM Protocol

Appendix G

The USB-MODEVM is defined to be a Vendor-Specific class, and is identified on the PC system as an

NI-VISA device. Because the TAS1020 has several routines in its ROM which are designed for use with

HID-class devices, HID-like structures are used, even though the USB-MODEVM is not an HID-class

device. Data is passed from the PC to the TAS1020 using the control endpoint.

Data is sent in an HIDSETREPORT (see Table G-1):

Table G-1. USB Control Endpoint

HIDSETREPORT Request

Part

Value

Description

bmRequestType

0x21

00100001

bRequest

0x09

SET_REPORT

wValue

0x00

don't care

wIndex

0x03

HID interface is index 3

wLength

calculated by host

Data

Data packet as described below

The data packet consists of the following bytes, shown in Table G-2:

Table G-2. Data Packet Configuration

BYTE NUMBER

TYPE

DESCRIPTION

Interface

Specifies serial interface and operation. The two values are logically ORed.

Operation:

READ

0x00

WRITE

0x10

Interface:

GPIO

0x08

SPI_16

0x04

I2C_FAST

0x02

I2C_STD

0x01

SPI_8

0x00

I2C Slave

Slave address of I2C device or MSB of 16-bit reg addr for SPI

Address

Length

Length of data to write/read (number of bytes)

Address of register for I2C or 8-bit SPI; LSB of 16-bit address for SPI

4..64

Data

Up to 60 data bytes could be written at a time. EP0 maximum length is 64. The return

packet is limited to 42 bytes, so advise only sending 32 bytes at any one time.

Example usage:

Write two bytes (AA, 55) to device starting at register 5 of an I2C device with address A0:

[0]

0x11

[1]

0xA0

[2]

0x02

[3]

0x05

[4]

0xAA

[5]

0x55

SLAU218 – August 2007

USB-MODEVM Protocol

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