UDRC / DRAWS Raspberry Pi image

Provision the micro SD Card

• Link to notes on how to download the NWDR image and write the image to an SD card

Start Initial Configuration

• Boot the newly provisioned microSD card

  login: pi
  passwd: digiberry
  

• Immediately verify that the DRAWS hat and its driver are operating.

  • Open a console and type:

    aplay -l
    

• You should see a line in the output that looks something like this:

  card 0: udrc [udrc], device 0: bcm2835-i2s-tlv320aic32x4-hifi tlv320aic32x4-hifi-0 []
  

• If you do NOT see udrc enumerated do NOT continue

  • Until the UDRC/DRAWS drivers are loaded the configuration scripts will NOT succeed.

Initial Configuration

• Run initcfg.sh script

  cd
  cd n7nix/config
  ./initcfg.sh
  

• The above initcfg.sh script completes by rebooting the first time it is run

• Upon logging in after the automatic reboot:

  • Verify DRAWS codec is still enumerated

    aplay -l
    

Set your ALSA configuration

• You must set your ALSA configuration for your particular radio at this time

  • Also note which connector you are using as you can vary ALSA settings based on which channel you are using
  • On a DRAWS hat left connector is left channel
  • On a UDRC II hat mDin6 connector is right channel
  • You also must route the AFOUT, compensated receive signal or the DISC, discriminator receive signal with ALSA settings.
  • Verify your ALSA settings by running alsa-show.sh

• Link to verify your installation is working properly

• NOTE: running the init.cfg script leaves AX.25 & direwolf NOT running & NOT enabled

  • The default config is to run HF applications like js8call, wsjtx and FLdigi
  • If you are not interested in packet and want to run an HF app then go ahead & do that now.

If you want to run Packet Turn on Direwolf & AX.25

• If you want to run a packet application or run some tests on the DRAWS board that requires direwolf then enable AX.25 and Direwolf by running the following command:

  ax25-start
  

Reboot to verify Packet configuration

• Now reboot and verify by running:

  ax25-status
  ax25-status -d
  

More Packet Program Options

• After confirming that the core functionality works you can configure other packet programs that will use direwolf such as rmsgw, paclink-unix, etc:

cd
cd n7nix/config
# Become root
sudo su
# If you want to run a Linux RMS Gateway
./app_config.sh rmsgw
# If you want to send & receive Winlink messages
./app_config.sh plu

For HAM apps that do NOT use direwolf

• If you previously ran a packet app and now want to run some other program that does NOT use direwolf like: js8call, wsjtx, FLdigi, then do this:

ax25-stop

• This will stop direwolf & all the AX.25 services allowing another program to use the DRAWS sound card.

FLdigi

• Soundcard device

  • Configure->Config dialog->Soundcard->Devices

  • Click on PortAudio check box and deselect all others

    capture: udrc: bcm2835-i2s-tlv320aic32x4-hifi-0
    playback: udrc: bcm2835-i2s-tlv320aic32x4-hifi-0
    

• PTT

  • Configuration->Rig->GPIO
  • For left mDin6 connector
    • Select BCM 12, check box =1
  • For right mDin6 connector
    • Select BCM 23, check box =1

JS8CALL

• Soundcard device

  • File->Settings-Audio->Modulation Sound Card

    Input:  plughw:CARD=udrc,DEV=0
    Output: plughw:CARD=udrc,DEV=0
    

• PTT

  • The following allows JS8Call to execute an external script for controlling a rig's PTT:

  • File->Settings->Radio->Rig Options->Advanced->PTT Command

    /home/pi/bin/ptt_ctrl.sh
    

• Script defaults to using left connector, to use right connector

  /home/pi/bin/ptt_ctrl.sh -r
  

To Enable the RPi On-Board Audio Device

• The default configuration enables the RPi on board bcm2835 sound device

• If for some reason you want to disable the sound device then:

  • As root comment the following line in /boot/config.txt

  • ie. put a hash character at the beginning of the line.

    dtparam=audio=on
    

• You need to reboot for any changes in /boot/config.txt to take effect

• after a reboot verify by listing all the sound playback hardware devices:

  aplay -l
  

Make your own Raspberry Pi image

• The driver required by the NW Digital Radio is now in the main line Linux kernel (since kernel version 4.19.66)
• To make your own Raspberry Pi image
  • Download the lastest version of Raspbian from here
  • Choose one of:
    • Raspbian Buster Lite
    • Raspbian Buster with desktop
    • desktop and recommended software

• Add the following lines to the bottom of /boot/config.txt

  dtoverlay=
  dtoverlay=draws,alsaname=udrc
  force_turbo=1
  

• If you want to ssh into your device then add an ssh file to the /boot directory

  touch /boot/ssh
  

• Boot the new micro SD card.