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Hi,
I ran the client software on 3 different Linux machines and I had quite a few problems with the USB.
- 1st device works perfectly.
- 2nd device misses a few answers from the Proxmark, below are the results of 2 'hw tune' commands run successively.
proxmark3> hw tune
#db# Measuring antenna characteristics, please wait..
proxmark3> hw tune
#db# Measuring complete, sending report back to host
# LF antenna: 0.00 V @ 125.00 kHz
# LF antenna: 0.00 V @ 134.00 kHz
# LF optimal: 0.00 V @ 12000.00 kHz
# HF antenna: 14.98 V @ 13.56 MHz
# Your LF antenna is unusable.
- 3rd device misses all the answers from the Proxmark. I can see that the commands are sent correctly because the LEDs flash appropriately but nothing ever gets sent back to the client.
Has anyone else encountered such a behaviour? Is there anything I could try to tune in the code to fix the problem (i.e.: latencies, etc.)? Any other general comments?
Cheers,
Marc.
You need to wait for the first command to finish before issuing a new one.
The USB is polled in the Atmel, so your commands will be lost or corrupted as the Atmel won't read the USB until it finishes with current command.
Thanks for your answer Cex.
On the second device I left a long gap between the 2 commands. I am able to verify the appropriate execution of the commands monitoring the LEDs too.
So I don't believe I ran into the problem you describe. My problem is that despite the Proxmark running correctly the PC does not receive all the results the Proxmark sends back. I ignore if the issue is PC related or Proxmark related.
Cheers,
Marc.
Turns out it had nothing to do with libusb-1.0 vs. libusb-0.1. The patch I applied to use libusb-1.0 also changed the USB read/write timeouts, and that's what made the difference. If you experience issues with the USB I suggest changing the timeouts in client/proxusb.c to 5000 (the original values are 1000 and 500).
Cheers,
Marc.