To follow up on this, I configured the parallel port for standard mode and the
xeno_can_peak_dng driver works without error so the problem has to do with the
EPP/ECP mode. I would like to use EPP or ECP for performance. And as
indicated below, the xeno_can_peak_dng driver only recognizes the sja1000 when
the bios is set to EPP mode. Any ideas on how to get it to work in EPP or ECP?
--John
-----Original Message-----
From: Charlton, John
Sent: Wednesday, August 05, 2009 10:12 AM
To: xenomai-help@gna.org
Subject: Peak parallel port dongle rtcan driver
I am having some problems with the xeno_can_peak_dng driver with the Peak
parallel port CAN dongle. I am using linux-2.6.27.7 kernel and xenomai-2.4.6.1
on an embedded PC (NANO-7240, ULV Celeron 400 MHz CPU).
I have done extensive testing using both RAW CAN and CanOpen using CanFestival
at 1Mbit baud with a TS-CAN1 PC-104 bus card with no errors. When I use the
Peak parallel port dongle at 1 Mbit or 125Kbit baud I loose packets and get
errors. It is worse receiving packets with rtcanrecv than transmitting with
rtcansend. I can transmit for longer intervals but eventually it fails with an
error. The last error reported is:
Assertion failed! <linux kernel
directory>/drivers/xenomai/can/rtcan_raw.c:rtcan_tx_push:171 dev->tx_socket ==
0 This error occurred after 484 successful transmissions with 100msec delay at
baudrate=1000000:
rtcansend rtcan0 --verbose --identifier=0x123 0xde 0xad 3 4 5 6 7 8
After the transmission failed the I was unable to send any more packets until I
reloaded the driver. The /proc/rtcan/rtcan0/info state goes to warning in this
case.
Receiving using rtcanrecv rtcan0 --verbose --error=0xffff has more errors.
Receiving errors result in corrupt packets but don't cause the CAN bus to quit
working or the state to go to warning. Right after a receive failure
Device rtcan0
Controller SJA1000
Board PEAK-Dongle
Clock-Hz 8000000
Baudrate 1000000
Bit-time brp=1 prop_seg=0 phase_seg1=5 phase_seg2=2 sjw=1 sam=0
Ctrl-Mode
State active
TX-Counter 0
RX-Counter 0
Errors 0
Refcount 0
SJA1000 registers
00: 80 00 0c 00 ff 00 00 14 1a 00 00 00 a2 60 00 00
10: 60 de ad 03 04 05 06 80 08 08 24 60 de 00 23 80
I currently have the Peak parallel dongle set to io=0x378 irq=7 type=epp. I
set the parallel port bios to EPP mode and IRQ 7. I tried ECP mode but the
xeno_can_peak_dng driver doesn't find the sja1000 unless the bios setting is
EPP. This conflicts with the Peak documentation which states in the FAQ that
ECP is the correct setting even though the driver type is EPP. It looks to me
like there may be a timing problem in the parallel port register read.
--John
John D. Charlton
Sr. Development Engineer
GATD Electrical Controls
Tyco Electronics Corporation
Mail Stop: 161-39
(717) 810-2141
(717) 810-2443 FAX
john.charl...@tycoelectronics.com
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