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Writing Scripts

Here is an example of using an SPI device that requires 16-bit register addresses:

# setup TSC2101 for input and output

# uses SPI16 interface

# this script sets up DAC and ADC at full volume, input from onboard mic

# Page 2: Audio control registers

w 10 00 00 00 80 00 00 00 45 31 44 FD 40 00 31 C4

w 13 60 11 20 00 00 00 80 7F 00 C5 FE 31 40 7C 00 02 00 C4 00 00 00 23 10 FE

00 FE 00

Note that blank lines are allowed. However, be sure that the script does not end with a blank line. While

ending with a blank line will not cause the script to fail, the program will execute that line, and therefore,

may prevent the user from seeing data that was written or read back on the previous command.

In this example, the first two bytes of each command are the command word to send to the TSC2101

(0x1000, 0x1360); these are followed by data to write to the device starting at the address specified in the

command word. The second line may wrap in the viewer being used to look like more than one line;

careful examination will show, however, that there is only one carriage return on that line, following the last

00.

Any text editor may be used to write these scripts; Jedit is an editor that is highly recommended for

general usage. For more information, go to: http://www.jedit.org.

Once the script is written, it can be used in the command window by running the program, and then

selecting Open Command File... from the File menu. Locate the script and open it. The script will then be

displayed in the command buffer. The user may also edit the script once it is in the buffer, but saving of

the command buffer is not possible at this time (this feature may be added at a later date).

Once the script is in the command buffer, it may be executed by pressing the Execute Command Buffer

button. If there are breakpoints in the script, the script will execute to that point, and the user will be

presented with a dialog box with a button to press to continue executing the script. When ready to

proceed, push that button and the script will continue.

Here an example of a (partial) script with breakpoints:

# setup AIC33 for input and output

# uses I2C

interface

I i2cfast

# reg 07 - codec datapath

w 30 07 8A

r 30 07 1

d 1000

# regs 15/16 - ADC volume, unmute and set to 0dB

w 30 0F 00 00

r 30 0F 2

This script writes the value 8A at register 7, then reads it back to verify that the write was good. A delay of

1000ms (one second) is placed after the read to pause the script operation. When the script continues, the

values 00 00 will be written starting at register 0F. This output is verified by reading two bytes, and

pausing the script again, this time with a break. The script would not continue until the user allows it to by

pressing OK in the dialog box that will be displayed due to the break.

USB-MODEVM Protocol

SLAU218 – August 2007

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