Python inferface for the dam1021 DAC

This library streamlines communication with a dam1021 device. The dam1021 is a DAC module based on a discrete R-2R sign magnitude DAC design, with FPGA based FIFO buffering/reclocking and custom digital filters.

Features

• Load firmware or filter set
• Filter management
• Digital volume control (two modes)
• Input source selection
• Mode of operation management
• Command-line utility

Installation

You need Python 2.7.x and additional libraries pyserial and xmodem. Then fetch dam1021.py file or whole this repository and you are done.

Installation procedure step-by-step

• Install Python 2.7.8 or later from the 2.7.x branch.
• Then grab needed virtualenv package:

pip install virtualenv

Windows users might find virtualenvwrapper-win handy.

• Create a new virtualenv.
• In your new environment:

pip install dam1021

• You are ready to use the library:

$ cd path/to/new/environment/lib/python2.7/site-packages
$ python dam1021.py -h

• ...or to use through Python shell directly (see API)

Command-line utility

All API functionality is exposed via a built-in utility. So you don't need to code yourself:

$ python dam1021.py -h
usage: dam1021.py [-h] [-v] [-V] [-s SERIAL] [-t TIMEOUT]
              (-d DOWNLOAD | -u DOWNLOAD_AND_UPDATE | --mode MODE | -l VOLUME_LEVEL | --flash-volume-level FLASH_VOLUME_LEVEL | -i INPUT_SOURCE | -f FILTER_SET | --default-filter-set DEFAULT_FILTER_SET | -c | -a)

This script is designed to operate with a dam1021 DAC. Exclusive access to a
serial device is a prerequisite.

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose         increase output verbosity
  -V, --Version         show program's version number and exit
  -s SERIAL, --serial-device SERIAL
                        serial device to use [default: /dev/ttyAMA0]
  -t TIMEOUT, --timeout TIMEOUT
                        serial read timeout to use in seconds [default: 2]
  -d DOWNLOAD, --download DOWNLOAD
                        download a new firmware or filter set
  -u DOWNLOAD_AND_UPDATE, --download-and-update DOWNLOAD_AND_UPDATE
                        download a new firmware and update uManager
  --mode MODE           select mode of operation [normal,invert,bal-left,bal-
                        right]
  -l VOLUME_LEVEL, --volume-level VOLUME_LEVEL
                        set a current volume level [-80,10] and -99 for
                        potentiometer control
  --flash-volume-level FLASH_VOLUME_LEVEL
                        set a volume level on flash [-80,10] and -99 for
                        potentiometer control
  -i INPUT_SOURCE, --input-source INPUT_SOURCE
                        set input source [0,3]
  -f FILTER_SET, --filter-set FILTER_SET
                        set a current filter set
                        [(1|linear)|(2|mixed)|(3|minimum)|(4|soft)]
  --default-filter-set DEFAULT_FILTER_SET
                        set a default filter set on flash
                        [(1|linear)|(2|mixed)|(3|minimum)|(4|soft)]
  -c, --current-filter-set
                        show currently selected filter set
  -a, --all-filters     show all available filters

  Example: python dam1021.py -s /dev/ttyUSB0 -d firmware.skr

API

Obviously you can create your own too. API is pretty simple:

>>> import dam1021
>>> conn = dam1021.Connection('/dev/ttyS0')
>>> conn.download(open('newfilter.skr').read())
>>> conn.set_current_volume_level(-14)
>>> conn.set_flash_volume_level(-22)
>>> conn.set_input_source(0)
...

Serial device naming conventions

POSIX systems are quite consistent in this regard. Usually your serial port is described as /dev/ttysomething (e.g. /dev/ttyUSB0 in case of a USB serial converter on Linux platform). Windows users should try either COMxx or \\.\COMxx where xx is 1,2 and so on. YMMV.

Bugs

Please use issue tracker for reporting.