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Writing Scripts

Each line in a script file is one command. There is no provision for extending lines beyond one line. 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

Comment

Break

Delay

The first command, I, sets the interface to use for the commands to follow. This command must be

followed by one of the following parameters:

i2cstd

Standard mode I2C Bus

i2cfast

Fast mode I2C bus

spi8

SPI bus with 8-bit register addressing

spi16

SPI bus with 16-bit register addressing

gpio

Use the USB-MODEVM GPIO capability

For example, if a fast mode I2C bus is to be used, the script would begin with:

I i2cfast

No data follows the break command. Anything following a comment command is ignored by the parser,

provided that it is on the same line. The delay command allows the user to specify a time, in milliseconds,

that the script will pause before proceeding.

Note:

UNLIKE ALL OTHER NUMBERS USED IN THE SCRIPT COMMANDS, THE DELAY

TIME IS ENTERED IN A DECIMAL FORMAT. Also, note that because of latency in the

USB bus as well as the time it takes the processor on the USB-MODEVM to handle

requests, the delay time may not be precise.

A series of byte values follows either a read or write command. Each byte value is expressed in

hexadecimal, and each byte must be separated by a space. Commands are interpreted and sent to the

TAS1020 by the program using the protocol described in Section G.1.

The first byte following a read or write command is the I2C slave address of the device (if I2C is used) or

the first data byte to write (if SPI is used—note that SPI interfaces are not standardized on protocols, so

the meaning of this byte will vary with the device being addressed on the SPI bus). The second byte is the

starting register address that data will be written to (again, with I2C; SPI varies—see Section G.1 for

additional information about what variations may be necessary for a particular SPI mode). Following these

two bytes are data, if writing; if reading, the third byte value is the number of bytes to read, (expressed in

hexadecimal).

For example, to write the values 0xAA 0x55 to an I2C device with a slave address of 0x90, starting at a

#example script

I i2cfast

w 90 03 AA 55

r 90 03 2

This script begins with a comment, specifies that a fast I2C bus will be used, then writes 0xAA 0x55 to the

I2C slave device at address 0x90, writing the values into registers 0x03 and 0x04. The script then reads

back two bytes from the same device starting at register address 0x03. Note that the slave device value

does not change. It is not necessary to set the R/W bit for I2C devices in the script; the read or write

commands will do that.

SLAU218 – August 2007

USB-MODEVM Protocol

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