ECE497 Project GPS Tracker
Embedded Linux Class by Mark A. Yoder
I'm using the following template to grade. Each slot is 10 points. 0 = Missing, 5=OK, 10=Wow!
00 Executive Summary 00 Installation Instructions 00 User Instructions 00 Highlights 00 Theory of Operation 00 Work Breakdown 00 Future Work 00 Conclusions 00 Demo 00 Late Comments: I'm looking forward to seeing this. Score: 10/100
Chris Hopwood and Robert Fendricks will be working on a way to interface the Beaglebone Black with a GPS tracker using UART. We plan on using this data to track the Bone's location on a map via a web interface.
If you have hardware, consider Small Build, Big Execuition for ideas on the final packaging.
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The GPS we are using is MTK3339
To load the device tree overlay on the beaglebone:
root@beaglebone# echo BB-UART4 > /sys/devices/bone_capemgr.*/slots
This will connect UART4-rx onto P9_11.
To find which tty the UART is exposed as, run:
root@beaglebone# dmesg | tail
On our beagle it outputted:
[ 50.991396] bone-capemgr bone_capemgr.8: slot #8: 'Override Board Name,00A0,Override Manuf,BB-UART4' [ 50.991495] bone-capemgr bone_capemgr.8: slot #8: Requesting part number/version based 'BB-UART4-00A0.dtbo [ 50.991514] bone-capemgr bone_capemgr.8: slot #8: Requesting firmware 'BB-UART4-00A0.dtbo' for board-name 'Override Board Name', version '00A0' [ 50.991542] bone-capemgr bone_capemgr.8: slot #8: dtbo 'BB-UART4-00A0.dtbo' loaded; converting to live tree [ 50.991860] bone-capemgr bone_capemgr.8: slot #8: #2 overlays [ 50.995484] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61) is a OMAP UART4 [ 50.996082] bone-capemgr bone_capemgr.8: slot #8: Applied #2 overlays. [ 51.171271] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 2 to 2 [ 61.202485] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 2 to 2 [ 71.233751] [drm:output_poll_execute], [CONNECTOR:5:HDMI-A-1] status updated from 2 to 2
According to [ 50.995484] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61) is a OMAP UART4 our port is mapped to ttyO4.
To test if the GPS is connected correctly, run:
root@beaglebone# screen /dev/ttyO4 9200
replacing ttyO4 with whatever device dmesg reported earlier.
To disconnect from the screen session correctly, press <ctrl>+<shift>+<:>, then type ":quit"
Once everything is installed, how do you use the program? Give details here, so if you have a long user manual, link to it here.
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Theory of Operation
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We first attempted to connect to the Beaglebone via the included FTDI cable. Here is a link to the FTDI cable's ref. sheet: http://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_TTL-232R_CABLES.pdf. To connect the
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Server Side Events info: http://www.html5rocks.com/en/tutorials/eventsource/basics/ GPS Ref. Sheet: http://learn.adafruit.com/downloads/pdf/adafruit-ultimate-gps.pdf GPS NMEA Sentences: http://www.gpsinformation.org/dale/nmea.htm
Embedded Linux Class by Mark A. Yoder