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Old 11-04-2015, 05:04 PM   #1
DoctorWkt
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Onyx Boox J25 Serial Port?

Hi all. I'm trying to use the J25 header on the right-hand side of my T68 as a serial port so that I can connect a GPS device. Apparently, other Boox devices also have the J25 header, e.g. the M96.

Does anybody have any details of this, e.g. pinouts. I believe on the T68 that it's 3.3V levels and connected to /dev/ttymxc0, but I have had no luck in working out which pin does what.

Many thanks in advance for any suggestions and pointers.
Warren
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Old 11-05-2015, 03:20 PM   #2
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Do you mean this header: http://c2n.me/3pUjmGt.jpg ?
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Old 11-05-2015, 04:17 PM   #3
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Do you mean this header: http://c2n.me/3pUjmGt.jpg ?
Yes, that's the one! Thanks, Warren
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Old 11-13-2015, 08:35 PM   #4
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Anybody else with any information on the J25 header on any Onyx device?
Thanks, Warren
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Old 11-18-2015, 04:15 AM   #5
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Yes, that's the one! Thanks, Warren

left -------- > right:
1 2 3 4 5
NC NC RX TX GND
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Old 11-18-2015, 06:23 AM   #6
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Many thanks Booxtor. And what Linux /dev device is it? /dev/ttymxc0 at 115,200 baud? 3.3V levels?

Cheers, Warren
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Old 11-18-2015, 07:33 PM   #7
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Hmm, I'm still not having any luck. I've soldered in three wires to the RX, TX, and GND pins. I've killed off the shell using /dev/ttymxc0 and I've renamed the character device so that the shell doesn't reopen it.

How: lsof | grep ttymxc0 to get the shell's PID
mv /dev/ttymxc0 /dev/fred
kill -9 shell's PID
microcom -s 115200 /dev/fred

I did a loopback test using microcom and wiring the TX and RX lines together. I didn't see anything. I've tried a bunch of different speeds with no luck. I'm starting to suspect that the device is powered down, based on this line in init.freescale.rc: write /sys/devices/platform/imx-uart.0/tty/ttymxc0/power/wakeup disabled

I did echo enabled > /sys/devices/platform/imx-uart.0/tty/ttymxc0/power/wakeup but that didn't change anything.

Anyway, I don't think that anybody can help me out, so this post is just a "marker" in case someone else travels down this path.

Cheers all & thanks Booxtor for the information.
Warren
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Old 12-01-2015, 02:51 AM   #8
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As a followup, I've bought a Bitscope Micro oscilloscope to look at the waveforms on these wires. I am not seeing anything, so perhaps the serial port is not implemented on the T68ML.

Cheers, Warren
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