FYDP NE2017_11:
Repurposing http://yetanotherpointlesstechblog.blogspot.ca/2016/04/emulating-bluetooth-keyboard-with.html in a 4-button + clickable analog joystick Raspberry Pi (RPi) Zero or Next Thing Co. CHIP based bluetooth controller(s) used for emulating a regular QWERTY keyboard's functionality on a VR-enabled Android smartphone while in the VR environment (with no touch-screen access)
FYDP Symposium Presentation: https://www.youtube.com/watch?v=vO8slpZmjig
Images
Setup instructions (now deprecated ever since the C.H.I.P. went out of production), still may apply for Raspberry Pi however
Headless setup for RPi
Add line '@bash /home/pi/vrbtkb/startup.sh' to the end of '/home/pi/.config/lxsession/LXDE/autostart' file for headless operation waiting about ~2 minutes for RPi to boot (and be running bt_server.py which accepts connections to a previously paired device) to then connect the VR-enabled Android smartphone to the RPi via bluetooth
RPi Button GPIO pins:
self.btn2_pin = 33
self.btn3_pin = 31
self.btn4_pin = 35
self.btn5_pin = 37
INSTRUCTIONS for Next Thing Co. CHIP software setup
Flash 4.4 server (FEL mode by shorting FEL and GND pins) http://flash.getchip.com/
~~delete the driver > libusbK > Flashing Mode Chip thingee
~~download and install linux-cdc-acm.inf from this link here: https://bbs.nextthing.co/t/version-4-4-always-in-flashing-mode/4960/20
https://bbs.nextthing.co/t/updated-cdc-composite-gadget-4-4-driver-issue-on-windows/7458
CHIP_IO pin names
https://github.com/xtacocorex/CHIP_IO
self.btn2_pin = "GPIO2"
self.btn3_pin = "GPIO3"
self.btn4_pin = "GPIO4"
self.btn5_pin = "GPIO6"
setup WiFi and SSH capabilities (Via COM port)
https://www.reddit.com/r/ChipCommunity/comments/5hndoj/setting_up_the_chip_under_win10_walkthrough/
sudo nmtui
sudo apt-get update
sudo apt-get install xrdp
echo xfce4-session >~/.xsession
nano /etc/xrdp/startwm.sh
<- For me it have worked to just exit without any editing.
sudo service xrdp restart
ip addr show
You are looking for something like:
Wlan0 inet 10.0.0.xxx where the 10.0.0.xxx is the CHIPs IP on your local network. Scribble down your CHIPs IP-adress.
sudo reboot
setup Bluetooth (Via SSH or COM port)
sudo apt-get remove blueman
sudo apt-get install git python-gobject bluez bluez-tools bluez-firmware python-bluez python-dev python-pip
git clone https://github.com/mjdi/vrbtkb
sudo cp /home/chip/vrbtkb/dbus/org.yaptb.btkbservice.conf /etc/dbus-1/system.d
do the bluetoothctl setup as usual
bluetoothctl
in the [bluetooth]# prompt that shows up:
agent on
default-agent
scan on
discoverable on
try to pair to CHIP with android smartphone (register new device)
BEFORE PRESSING YES ON THE ANDROID PHONE, enter (yes) in the bluetoothctl prompt when it asks you to on the CHIP
Now, the device should be registered, and when you reboot the CHIP and wait ~ 20 sec (after it fully boots), you should be able to connect the Smartphone in order to use the CHIP as a BT keyboard
SpiDev setup for CHIP
git clone https://github.com/doceme/py-spidev
cd ./py-spidev
sudo python setup.py install
cd ..
https://bbs.nextthing.co/t/spi-serial-communication-on-chip/11937/5
sudo nano /etc/rc.local
add these two lines to the end of rc.local, just before "exit 0" (so it runs on startup)
mkdir -p /sys/kernel/config/device-tree/overlays/spi
cat /lib/firmware/nextthingco/chip/sample-spi.dtbo > /sys/kernel/config/device-tree/overlays/spi/dtbo
then in the terminal run http://www.chip-community.org/index.php/SPI_support (short MOSI and MISO to test spidev with the instructions there)
sudo modprobe spidev
to activate the spidev
sudo reboot
and then confirm that spidev exists with
ls /dev/spidev*
GPIO setup for CHIP
^^ Turns out the latest 4.4 CHIP kernel does set the CONFIG_CONGIFS on https://github.com/xtacocorex/CHIP_IO ("OverlayManager requires a 4.4 kernel with the CONFIG_OF_CONFIGFS option enabled in the kernel config.")
sudo apt-get install git build-essential python-dev python-pip flex bison -y
git clone https://github.com/atenart/dtc
cd dtc
make
sudo make install PREFIX=/usr
cd ..
git clone https://github.com/xtacocorex/CHIP_IO.git
cd CHIP_IO
sudo python setup.py install
cd ..
sudo rm -rf CHIP_IO
Headless setup for CHIP
Use systemwide crontab to allow for headless operation"
sudo nano /etc/crontab
add the following line to the file and use Ctrl-O to save the edit
@reboot chip sleep 7; echo "chip" | sudo bash /home/chip/vrbtkb/startup.sh
NOW REBOOT!
sudo reboot