USB <-> Seriell

[AArdo]

I have an AVR ATMega16 board talking RS232 serial that I want to connect to my Bubba 2.
So I bought a USB to serial adapter which was recognized by the system.

Trying out a small test program:
#!/usr/bin/perl
$|=1;
open(AVR,"+</dev/ttyUSB0"); #Both read and write
print AVR "p";
while(<AVR>) { print; last if /Unkown command/;}

I get the expected output (a few lines from the AVR) - BUT I also get the following in my syslog:
Apr 27 16:47:00 kalle kernel: ------------[ cut here ]------------
Apr 27 16:47:00 kalle kernel: Badness at d1190510 [verbose debug info unavailable]
Apr 27 16:47:00 kalle kernel: NIP: d1190510 LR: c015c240 CTR: d11904e0
Apr 27 16:47:00 kalle kernel: REGS: cf835d90 TRAP: 0700 Tainted: G W (2.6.26.5)
Apr 27 16:47:00 kalle kernel: MSR: 00029032 <EE,ME,IR,DR> CR: 24002082 XER: 00000000
Apr 27 16:47:00 kalle kernel: TASK = cf81e000[4] 'events/0' THREAD: cf834000
Apr 27 16:47:00 kalle kernel: GPR00: 00000001 cf835e40 cf81e000 cedabc00 cedabc00 cee991af 00000008 ae7c17a3
Apr 27 16:47:00 kalle kernel: GPR08: c90c7660 d1190000 08000000 00000800 24002084 1001a7f0 0ffbf000 cedabcd4
Apr 27 16:47:00 kalle kernel: GPR16: c0352594 c02e05b0 cf835e78 cedabcb8 cedabd84 cedabd1c c0340000 c02be6cc
Apr 27 16:47:00 kalle kernel: GPR24: c0346128 00000000 cee990af 00000001 cee991b0 cedabc00 00000055 cef34600
Apr 27 16:47:00 kalle kernel: Call Trace:
Apr 27 16:47:00 kalle kernel: [cf835e40] [00009032] (unreliable)
Apr 27 16:47:00 kalle kernel: [cf835e50] [c015c240]
Apr 27 16:47:00 kalle kernel: [cf835e60] [c0159ccc]
Apr 27 16:47:00 kalle kernel: [cf835e70] [c015afb8]
Apr 27 16:47:00 kalle kernel: [cf835f50] [c0155d14]
Apr 27 16:47:00 kalle kernel: [cf835f70] [c002dbd8]
Apr 27 16:47:00 kalle kernel: [cf835f90] [c002e1b0]
Apr 27 16:47:00 kalle kernel: [cf835fd0] [c0031ba0]
Apr 27 16:47:00 kalle kernel: [cf835ff0] [c000fb4c]
Apr 27 16:47:00 kalle kernel: Instruction dump:
Apr 27 16:47:00 kalle kernel: 9421fff0 7c0802a6 3d20d119 93e1000c 90010014 80095664 83e30138 2f800000
Apr 27 16:47:00 kalle kernel: 409e0040 801f0070 7c000034 5400d97e <0f000000> 817f0000 7fe3fb78 812b0004
Apr 27 16:47:00 kalle kernel: ------------[ cut here ]------------
Apr 27 16:47:00 kalle kernel: Badness at d11905b8 [verbose debug info unavailable]
Apr 27 16:47:00 kalle kernel: NIP: d11905b8 LR: c0155254 CTR: d1190568
Apr 27 16:47:00 kalle kernel: REGS: cf835d80 TRAP: 0700 Tainted: G W (2.6.26.5)
Apr 27 16:47:00 kalle kernel: MSR: 00029032 <EE,ME,IR,DR> CR: 24002082 XER: 00000000
Apr 27 16:47:00 kalle kernel: TASK = cf81e000[4] 'events/0' THREAD: cf834000
Apr 27 16:47:00 kalle kernel: GPR00: 00000001 cf835e30 cf81e000 ffffffed cf835e58 00000001 00000008 ae7c17a3
Apr 27 16:47:00 kalle kernel: GPR08: c90c7660 d1190000 00000000 c71a0c00 24002084 1001a7f0 0ffbf000 cedabcd4
Apr 27 16:47:00 kalle kernel: GPR16: c0352594 c02e05b0 cf835e78 cedabcb8 cedabd84 cedabd1c c0340000 c02be6cc
Apr 27 16:47:00 kalle kernel: GPR24: c0346128 00000000 cee990af 00000001 cee991b0 cf835e58 00000001 cef34600
Apr 27 16:47:00 kalle kernel: Call Trace:
Apr 27 16:47:00 kalle kernel: [cf835e30] [cedabc00] (unreliable)
Apr 27 16:47:00 kalle kernel: [cf835e50] [c0155254]
Apr 27 16:47:00 kalle kernel: [cf835e60] [c0159d48]
Apr 27 16:47:00 kalle kernel: [cf835e70] [c015afb8]
Apr 27 16:47:00 kalle kernel: [cf835f50] [c0155d14]
Apr 27 16:47:00 kalle kernel: [cf835f70] [c002dbd8]
Apr 27 16:47:00 kalle kernel: [cf835f90] [c002e1b0]
Apr 27 16:47:01 kalle kernel: [cf835fd0] [c0031ba0]
Apr 27 16:47:01 kalle kernel: [cf835ff0] [c000fb4c]
Apr 27 16:47:01 kalle kernel: Instruction dump:
Apr 27 16:47:01 kalle kernel: 817f0000 812b0000 80090014 2f800000 419e0040 3d20d119 80095664 2f800000
Apr 27 16:47:01 kalle kernel: 409e0044 801f0070 7c000034 5400d97e <0f000000> 812b0004 7fe3fb78 7fa4eb78

Which I don't really like.

Any hints, tips, etc what to do?
I'm thankfull for any help.

Anders

[tor]

Hi Anders,

Which cable is this? And when does this occur? When plugging the cable or when executing your perl script?

/Tor

[AArdo]

Hi Anders,

Which cable is this? And when does this occur? When plugging the cable or when executing your perl script?

/Tor

Tor,
It is from Kjell o Co item 38885: USB till seriell adapter DB9ha - USB A ha
(Sorry haven't got any more info ...) -- Recommendations for a better one?

Error messages occur each time I execute the script.

Syslog entry when I plugging the cable:
Apr 26 20:34:56 kalle kernel: usb 1-1.1: new full speed USB device using fsl-ehci and address 8
Apr 26 20:34:56 kalle kernel: usb 1-1.1: configuration #1 chosen from 1 choice
Apr 26 20:34:56 kalle kernel: pl2303 1-1.1:1.0: pl2303 converter detected
Apr 26 20:34:56 kalle kernel: usb 1-1.1: pl2303 converter now attached to ttyUSB0

Anders

[tor]

Hi again AArdo,

I have not the exakt same cable but another one based on pl2303. And i unfortunately can't reproduce your problem. I however connect the other end to a PC.

Can you get the same results when connecting Bubba via this to your PC? I installed minicom on Bubba and ran a terminal on the pc. That worked ok.

Further more i see no serial port setup code in your example. Could this maybe be the thing triggering this behavior?

/Tor

[AArdo]

Tor!

Hi again AArdo,
...
Further more i see no serial port setup code in your example. Could this maybe be the thing triggering this behavior?

/Tor

You're probably right. Installing minicom and running towards my AVR works OK, and after that my Perl script works OK aswell.

Thanks for your help!
Anders