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45 lines
2.1 KiB
45 lines
2.1 KiB
4 months ago
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## Using WALT on ChromeOS
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WALT can be used on ChromeOS in two different modes:
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1. Via the [pywalt/walt.py](/pywalt/walt.py) command line script - for this mode refer to [pywalt/README.md](/pywalt/README.md)
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1. Using the [WALT Android app](https://play.google.com/store/apps/details?id=org.kamrik.latency.walt) and walt.py script as a bridge
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For either mode you will need to use a ChromeOS test image -
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[some pointers on how to get it installed](https://www.chromium.org/chromium-os/testing/autotest-developer-faq/ssh-test-keys-setup)
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Copy the [pywalt/](/pywalt) directory from WALT repo to the Chromebook. One option is to download a repo tarball directly from GitHub:
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```
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wget https://github.com/google/walt/archive/master.tar.gz
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tar -xzf master.tar.gz
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cd walt-master/pywalt
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./walt.py --help
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```
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Connect WALT to Chromebook's USB port and test the setup by running: `$ ./walt.py -t sanity` on the Chromebook.
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This continuously displays readings from WALT's sensors (press Ctrl-C to stop):
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```
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Starting sanity test
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q G:480 PD_screen:3 PD_laser:910 min-max: 480-480 3-3 910-910
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q G:514 PD_screen:3 PD_laser:896 min-max: 480-514 3-3 896-910
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q G:486 PD_screen:4 PD_laser:894 min-max: 480-514 3-4 894-910
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q G:509 PD_screen:4 PD_laser:891 min-max: 480-514 3-4 891-910
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...
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```
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The first reading `G` is the accelerometer, it should change when WALT is rotated.
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`PD_screen` and `PD_laser` are the light sensors (photodiodes), shading them or exposing to light should change their readings.
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### Using WALT Android app
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If you intend to run the android app, run walt.py in TCP bridge mode. This is needed because Android container on ChromeOS has no access to USB.
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- `iptables -A INPUT -p tcp --dport 50007 -j ACCEPT`
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- `./walt.py -t bridge`
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The script will respond with `Listening on port 50007`. It can be stopped by pressing Ctrl-C. At this point you should be able to use the WALT Android app as if it's running on a regular Android device. If you reset or reconnect the WALT device, you'll need to re-run the script (no need to re-run the iptables command).
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If you need to deploy your own version of WALT Android app, follow instruction in [Development.md](Development.md)
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