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PCD8 8-bit DMA Interface User’s Guide About the Software and Firmware

EDT, Inc. May 2007 4

Software Initialization Files

Software initialization files (having the extension .cfg) are editable text files that run like scripts to

configure EDT boards so that they are ready to perform DMA. The commands in a software

initialization file are defined in a C application named

initpcd. When you invoke initpcd, you specify

which software initialization file to use with the

-f flag.

A typical software initialization file loads an FPGA configuration file into the UI FPGA and sets up

various registers to prepare the board for DMA transfers. Some software initialization files may also

load an FPGA configuration file into an FPGA residing on the mezzanine board.

A variety of software initialization files are included with the EDT software, at least one of which is

customized for each main board or main board / mezzanine board combination — that is, each FPGA

configuration file has a matching software initialization file. Software initialization files are located in

the

pcd_config subdirectory of the EDT top-level distribution directory. The software initialization files

specific to your PCD8 are listed at the beginning of this section. Instructions for their use are provided

in Configuring the PCD8.

Commands defined in

initpcd and typically found in software initialization files allow for specific

FPGA configuration files to be loaded (for example,

bitfile:), write specified hexadecimal values to

specified registers (for example,

command_reg:), enable or disable byte-swapping or short-swapping

to accommodate different operating systems’ requirements for bit ordering (for example,

byteswap:),

or invoke arbitrary commands (for example,

run_command:). For example:

bitfile: ssd16io.bit

command_reg: 0x08

byteswap: 1

run_command: set_ss_vco -F 1000000 2

For complete usage details, enter

initpcd --help.

C source for

initpcd is included so that you can add your own commands, if you wish. You can then

edit your own software initialization file to use your new commands and specify that

initpcd use your

new file when configuring your board. If you would like us to include your new software initialization

commands in subsequent releases of

initpcd, send mail to [email protected].

Sample Applications and Utilities

Along with the driver, the FPGA configuration files, and the software initialization files, the software CD

includes a number of applications and utilities that you can use to initialize and configure the board,

access registers, or test the board. For many of these applications and utiilities, C source is also

provided, so that you can use them as starting points to write your own applications. The most

commonly useful are described below; see the README file for the complete list.

NOTE Software is updated regularly; the latest versions are available on our website at

www.edt.com/software.html. We encourage you to use the latest versions for new installations.

For existing applications, upgrade only if you have a specific reason to do so.

Sample Applications

rd16 Performs simple multichannel ring buffer input.

wr16 Performs simple multichannel ring buffer output.

simple_read Performs DMA input without using ring buffers. Data is therefore subject to

interruptions, depending on system performance.

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