You're providing far too much information, and not enough of the right
information. It would be good to know the output of the following commands.
cat /sys/devices/platform/bone_capemgr/slots
ifconfig can0
Additionally, I know nothing of the cape you mention, and knowing your
circuit layout would be good too, but not really necessary. Many seem to
have had this same, or similar issues, which I'll assume is related to
improper CANBUS termination. But since no one has bothered to come back on
and follow up . . . who really knows ? I do know that using the Logicsupply
CAN cape works. We have one, and I've dumped loads of data off a "local"
industrial CAN network.
On Mon, May 2, 2016 at 12:50 PM, <milh...@gmail.com> wrote:
> Hi Folks,
>
> I am easily able to receive CAN traffic with my Peak USB-CAN interface on
> my linux workstation. I know our device is producing regular updates at
> 250000 and it dumps find using candump.
>
> For a couple days I have been trying (without success) to duplicate the
> behavior on my Element Rev B6 Beaglebone. I've read many posts and have
> worked bast a bunch of issues but still get no can traffic.
>
> The results are the same with a WaveShare CAN Cape or a discrete NXP
> TJA1051 High-speed CAN transceiver that I have connected on a breadboard.
> If I hook a scope to the input RX signal I can see the external CAN traffic
> but nothing gets through.
>
> I did modify ~/bb.org-overlays/src/arm/cape-universaln-00A0.dts to remove
> references to pins P9_24 and P9_26 (UART1 RX/TX)
>
> For clarity's sake here is the script that I run after rebooting the
> Beaglbone.
>
> set -x
> echo "# make sure, I'm running as root, unmolested
> bone-debian-8.3-lxqt-4gb-armhf-2016-01-24-4gb.img image"
> id
> uname -a
>
> echo "# look, can pin muxing for P9_24 and P9_26 are at default (GPIO,
> mode 7)"
> devmem2 0x44E10980 w
> devmem2 0x44E10984 w
>
> echo "# cat my overlay File, has been built/installed/rebooted
> successfully"
> cat /hone/debian/bb.org-overlays/src/arm/BB-CAN1-00A0.dts
>
> echo "# install my overlay to setup the CAN pins"
> sh -c "echo 'BB-CAN1' > /sys/devices/platform/bone_capemgr/slots"
>
> echo "# see that the overlay was installed and make sure pins went to
> mode 2"
> cat /sys/devices/platform/bone_capemgr/slots
> devmem2 0x44E10980 w
> devmem2 0x44E10984 w
>
> echo "#load the can drivers"
> modprobe can
> modprobe can-dev
> modprobe can-raw
>
> echo "# show what's loaded"
> lsmod
>
> echo "# fire up the interface"
> ip link set can0 type can bitrate 250000 triple-sampling on
> ip link set can0 up
>
> echo "# see that we're up"
> ifconfig can0
>
> echo "#Shoud receive can data, same as my linux workstation..."
> candump can0
>
>
> Here is the output from the script..
>
> debian@beaglebone:~$ sudo ./canSetup.sh
> + echo # make sure, I'm running as root, unmolested
> bone-debian-8.3-lxqt-4gb-armhf-2016-01-24-4gb.img image
> # make sure, I'm running as root, unmolested
> bone-debian-8.3-lxqt-4gb-armhf-2016-01-24-4gb.img image
> + id
> uid=0(root) gid=0(root) groups=0(root)
> + uname -a
> Linux beaglebone 4.1.15-ti-rt-r43 #1 SMP PREEMPT RT Thu Jan 21 20:13:58
> UTC 2016 armv7l GNU/Linux
> + echo # look, can pins P9_24 and P9_26 are at default (GPIO, mode 7)
> # look, can pins P9_24 and P9_26 are at default (GPIO, mode 7)
> + devmem2 0x44E10980 w
> /dev/mem opened.
> Memory mapped at address 0xb6f93000.
> Value at address 0x44E10980 (0xb6f93980): 0x37
> + devmem2 0x44E10984 w
> /dev/mem opened.
> Memory mapped at address 0xb6f9b000.
> Value at address 0x44E10984 (0xb6f9b984): 0x37
> + echo # cat my overlay File, has been built/installed/rebooted
> successfully
> # cat my overlay File, has been built/installed/rebooted successfully
> + cat /home/debian/bb.org-overlays/src/arm/BB-CAN1-00A0.dts
> /*
> * Copyright (C) 2015 Robert Nelson <robertcnel...@gmail.co>
> *
> * Virtual cape for CAN1 on connector pins P9.24 P9.26
> *
> * This program is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License version 2 as
> * published by the Free Software Foundation.
> */
> /dts-v1/;
> /plugin/;
>
> #include <dt-bindings/board/am335x-bbw-bbb-base.h>
> #include <dt-bindings/pinctrl/am33xx.h>
>
> / {
> compatible = "ti,beaglebone", "ti,beaglebone-black",
> "ti,beaglebone-green";
>
> /* identification */
> part-number = "BB-CAN1";
> version = "00A0";
>
> /* state the resources this cape uses */
> exclusive-use =
> /* the pin header uses */
> "P9.24", /* can1_rx */
> "P9.26", /* can1_tx */
> /* the hardware ip uses */
> "dcan1";
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
> bb_dcan1_pins: pinmux_dcan1_pins {
> pinctrl-single,pins = <
> BONE_P9_24 (SLEWCTRL_FAST | PIN_INPUT_PULLUP |
> MUX_MODE2) /* uart1_txd.d_can1_rx */
> BONE_P9_26 (SLEWCTRL_FAST | PIN_OUTPUT_PULLUP |
> MUX_MODE2) /* uart1_rxd.d_can1_tx */
> >;
> };
> };
> };
>
> fragment@1 {
> target = <&dcan1>;
> __overlay__ {
> status = "okay";
> pinctrl-names = "default";
> pinctrl-0 = <&bb_dcan1_pins>;
> };
> };
> };
> + echo # install my overlay to setup the CAN pins
> # install my overlay to setup the CAN pins
> + sh -c echo 'BB-CAN1' > /sys/devices/platform/bone_capemgr/slots
> + echo # see that the overlay was installed and make sure pins went to
> mode 2
> # see that the overlay was installed and make sure pins went to mode 2
> + cat /sys/devices/platform/bone_capemgr/slots
> 0: PF---- -1
> 1: PF---- -1
> 2: PF---- -1
> 3: PF---- -1
> 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,cape-universaln
> 5: P-O-L- 1 Override Board Name,00A0,Override Manuf,BB-CAN1
> + devmem2 0x44E10980 w
> /dev/mem opened.
> Memory mapped at address 0xb6f21000.
> Value at address 0x44E10980 (0xb6f21980): 0x12
> + devmem2 0x44E10984 w
> /dev/mem opened.
> Memory mapped at address 0xb6fa5000.
> Value at address 0x44E10984 (0xb6fa5984): 0x32
> + echo #load the can drivers
> #load the can drivers
> + modprobe can
> + modprobe can-dev
> + modprobe can-raw
> + echo # show what's loaded
> # show what's loaded
> + lsmod
> Module Size Used by
> can_raw 5408 0
> can 28227 1 can_raw
> c_can_platform 6564 0
> c_can 9605 1 c_can_platform
> can_dev 11455 1 c_can
> spidev 6739 0
> pwm_tiecap 3492 0
> pwm_tiehrpwm 4546 0
> tieqep 8510 0
> 8021q 17336 0
> garp 5975 1 8021q
> mrp 7322 1 8021q
> stp 1911 1 garp
> llc 5257 2 stp,garp
> snd_soc_evm 5749 0
> pruss_remoteproc 15296 0
> snd_soc_davinci_mcasp 17266 2
> snd_soc_edma 1150 1 snd_soc_davinci_mcasp
> omap_rng 4358 0
> rng_core 7437 1 omap_rng
> tilcdc 26254 0
> spi_omap2_mcspi 10681 0
> usb_f_acm 7180 1
> u_serial 10596 3 usb_f_acm
> usb_f_rndis 22734 1
> g_multi 5316 0
> usb_f_mass_storage 42745 2 g_multi
> u_ether 12028 2 usb_f_rndis,g_multi
> libcomposite 43810 4 usb_f_acm,usb_f_rndis,g_multi,
> usb_f_mass_storage
> tda998x 11749 0
> snd_soc_hdmi_codec 2474 1
> uio_pdrv_genirq 3521 0
> uio 8463 1 uio_pdrv_genirq
> + echo # fire up the interface
> # fire up the interface
> + ip link set can0 type can bitrate 250000 triple-sampling on
> + ip link set can0 up
> + echo # see that we're up
> # see that we're up
> + ifconfig can0
> can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00
> -00-00-00
> UP RUNNING NOARP MTU:16 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:10
> RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
> Interrupt:208
>
> + echo #Shoud receive can data, same as my linux workstation...
> #Shoud receive can data, same as my linux workstation...
> + candump can0
>
> .... Nothing produced.
>
>
>
>
> Here is the dmesg output while the script is running...
>
> [ 101.514143] bone_capemgr bone_capemgr: part_number 'BB-CAN1', version
> 'N/A'
> [ 101.514196] bone_capemgr bone_capemgr: slot #5: override
> [ 101.514222] bone_capemgr bone_capemgr: Using override eeprom data at
> slot 5
> [ 101.514250] bone_capemgr bone_capemgr: slot #5: 'Override Board
> Name,00A0,Override Manuf,BB-CAN1'
> [ 102.998539] c_can_platform 481d0000.can: c_can_platform device
> registered (regs=fa1d0000, irq=209)
> [ 103.002556] bone-pinmux-helper ocp:P8_09_pinmux: could not find
> pctldev for node /ocp/l4_wkup@44c00000/prcm@200000/clocks/dpll_per_m2_ck,
> deferring probe
> [ 103.003340] bone_capemgr bone_capemgr: slot #5: dtbo
> 'BB-CAN1-00A0.dtbo' loaded; overlay id #1
> [ 104.557399] can: controller area network core (rev 20120528 abi 9)
> [ 104.557665] NET: Registered protocol family 29
> [ 105.965220] can: raw protocol (rev 20120528)
> [ 106.107030] c_can_platform 481cc000.can can0: setting BTR=1c05 BRPE=
> 0000
>
>
> If anyone can tell me why I can't get the IO to work I'd be grateful!
>
> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to beagleboard+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/beagleboard/bfe72a1d-e216-4fcd-a588-5eb756f22b98%40googlegroups.com
> <https://groups.google.com/d/msgid/beagleboard/bfe72a1d-e216-4fcd-a588-5eb756f22b98%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
> For more options, visit https://groups.google.com/d/optout.
>
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to beagleboard+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/beagleboard/CALHSORoJtfaQcqmP29gVHGFjamG_YOgvAwz5usYKjjXgZQjE-w%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
