# MangOH yellow CAN Iot Bus not working **URL:** \ **Category:** mangOH Yellow\ **Created:** [September 18, 2020, 1:47pm UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245 "2020-09-18T13:47:27Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 18, 2020, 1:47pm UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/1 "2020-09-18T13:47:27Z")
Hello, i’m a beginner in mangOH card developping. I have a mangOH yellow with this card module to communicate using CAN protocol : > **[Talon%20mangOH%20CAN%20Bus%20Module%20Brief%202016.pdf](https://www.taloncom.com/images/Talon%20mangOH%20CAN%20Bus%20Module%20Brief%202016.pdf)** > > 300.94 KB But unfortunately i get a “busheavy” message status when i’m trying to send message trough the CAN (i’m using PCAN-View) The question is maybe obvious but do i have to install some drivers or are they already setting up on the mangOH yellow ? If yes do i have to follow this tutorial even if it is for a mangOH green card ? : https://www.youtube.com/embed/7xESMOZbJ_Q?feature=oembed&wmode=opaque&list=PL7zYaL0XChvD_PyyaEWMDHr2UovrT5TWJ Thanks by advance for your replies. Ps: sorry if my english is bad i’m french. ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 18, 2020, 2:02pm UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/2 "2020-09-18T14:02:40Z")
I never tried before, but i saw the last few line of this file, you need to uncomment the last line to have the CAN driver > ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 8:15am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/3 "2020-09-24T08:15:03Z")
Hi @jyijyi, thanks for you response ! I just forget to update the software (it was very old) to 3.0.0. After the upgrade i see a canpoen app on my mangOH yellow, but unfortunately it doesn’t want to start. I performed a “logread -f” to see what is happening and i get these errors : > Sep 24 10:08:35 swi-mdm9x28-wp user.err Legato: =ERR= | canopen\_dbg[4715] | ifconfig: SIOCGIFFLAGS: No such device > Sep 24 10:08:35 swi-mdm9x28-wp user.debug kernel: [1468.329510] gpio\_map\_name\_to\_num: find GPIO 38 > Sep 24 10:08:35 swi-mdm9x28-wp user.debug kernel: [1468.329534] gpio-38 (sysfs): gpiod\_request: status -16 > Sep 24 10:08:35 swi-mdm9x28-wp user.debug kernel: [1468.329544] export\_store: status -16 > Sep 24 10:08:35 swi-mdm9x28-wp user.err Legato: =ERR= | canopen\_dbg[4715]/components T=main | canbus.c WriteToSysfs() 196 | Error writing to sysfs file ‘/sys/class/gpio/export’ (Device or resource busy). > Sep 24 10:08:35 swi-mdm9x28-wp user.err Legato: =ERR= | canopen\_dbg[4715]/components T=main | canbus.c WriteToSysfs() 196 | Error writing to sysfs file ‘/sys/class/gpio/export’ (Device or resource busy). > Sep 24 10:08:35 swi-mdm9x28-wp user.err Legato: =ERR= | canopen\_dbg[4715]/components T=main | canbus.c insmod() 165 | Unable to load can module /legato/systems/current/modules/can\_iot.ko errno: Exec format error Did anyone has an idea ? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 8:44am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/4 "2020-09-24T08:44:23Z")
GPIO38 in kernel means GPIO2 of the module. From the script below, I believe it needs to control GPIO2 , but it failed in your log: > What is the return of AT+WIOCFG? Also did you have the mcp251x kernel driver in the module? ( you can find by "find / -name “mcp251x\*”) ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 8:55am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/5 "2020-09-24T08:55:18Z")
What do you mean by “AT+WIOCFG” ? Is it the expected output ? : > root@swi-mdm9x28-wp:~# find / -name “mcp251x\*” > /lib/modules/3.18.140/kernel/drivers/net/can/spi/mcp251x.ko ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 9:15am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/6 "2020-09-24T09:15:14Z")
root@swi-mdm9x28-wp:~# microcom /dev/ttyAT at+wiocfg? +WIOCFG: 2,16,0,0,1,0,0 +WIOCFG: 4,0,0,0,1,0,0 +WIOCFG: 6,0,0,0,1,0,0 +WIOCFG: 7,16,0,0,1,0,0 +WIOCFG: 8,16,0,0,1,0,0 +WIOCFG: 13,16,0,0,1,0,0 +WIOCFG: 21,16,0,0,1,0,0 +WIOCFG: 22,16,0,0,1,0,0 +WIOCFG: 23,16,0,0,1,0,0 +WIOCFG: 24,16,0,0,1,0,0 +WIOCFG: 25,16,0,0,1,0,0 +WIOCFG: 28,16,0,0,1,0,0 +WIOCFG: 29,16,0,0,1,0,0 +WIOCFG: 30,16,0,0,1,0,0 +WIOCFG: 31,16,0,0,1,0,0 +WIOCFG: 32,16,0,0,1,0,0 +WIOCFG: 33,16,0,0,1,0,0 +WIOCFG: 35,16,0,0,1,0,0 +WIOCFG: 42,16,0,0,1,0,0 OK (ctrl+x to quit the program) ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 9:23am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/7 "2020-09-24T09:23:06Z")
When i do the “microcom /dev/ttyAT” command, nothing appears. ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 9:24am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/8 "2020-09-24T09:24:23Z")
What do you mean nothing appears? Do you enter AT command there? BTW, do you see modem port in device manager in Windows platform? Or do you see /dev/ttyUSB2 in host linux PC ? ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 9:28am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/9 "2020-09-24T09:28:10Z")
I performed your command and nothing happend on the terminal : I did this : ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/a/a6c761bbb2fe61adc29fec35a93e5c21eb32e6b5.png) I am on Windows and i have this one on device manager : ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/5/53e3536b34d91108255aabcc792af9426621b841.png) ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 9:30am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/10 "2020-09-24T09:30:51Z")
you need to type AT+WIOCFG? by yourself after “microcom /dev/ttyAT” ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 9:31am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/11 "2020-09-24T09:31:23Z")
Oh sorry i didn’t undestand that i have to enter “at+wiocfg?” Here is the output : ![image](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/2X/e/e6c9325122b695a29339ba422ba5f5bf87af8f7d.png) Just to know, what is the goal of this program ? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 9:38am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/12 "2020-09-24T09:38:29Z")
this is to check the GPIO2 status. BTW, can you type following in console: echo 2 \> /sys/class/gpio/export echo out \> /sys/class/gpio/gpio2/direction echo 1 \> /sys/class/gpio/gpio2/value modprobe mcp251x ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 9:40am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/13 "2020-09-24T09:40:55Z")
I get this : > root@swi-mdm9x28-wp:~# echo 2 \> /sys/class/gpio/export > sh: write error: Device or resource busy For the 2 others command it didn’t output any error message ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 9:48am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/14 "2020-09-24T09:48:58Z")
Then seems the GPIO2 is working fine. How about the following?: modprobe mcp251x kmod load can\_iot.ko ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 9:52am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/15 "2020-09-24T09:52:34Z")
Are you sure that another program is not still using the GPIO2 ? > root@swi-mdm9x28-wp:~# modprobe mcp251x > root@swi-mdm9x28-wp:~# kmod load can\_iot.ko > Could not load the required module, can\_iot.ko. (LE\_NOT\_FOUND) > See the device log for details. ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 9:57am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/16 "2020-09-24T09:57:51Z")
Seems your platform does not have the CAN driver. You can try to search by: find / -name “can\_iot.ko" ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 9:58am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/17 "2020-09-24T09:58:36Z")
> root@swi-mdm9x28-wp:~# find -name “can\_iot.ko” > root@swi-mdm9x28-wp:~# ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 9:59am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/18 "2020-09-24T09:59:52Z")
that is why the driver cannot be loaded. You need to rebuild the mangoh yellow layer and add the following in yellow.sdef: // Uncomment to include support for the CAN IoT card #include “sinc/can\_iot\_card.sinc” ---
**Author:** ![Antoine](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@Antoine](https://mangoh.discourse.group/u/Antoine)\ **Post date:** [September 24, 2020, 10:01am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/19 "2020-09-24T10:01:11Z")
How can i rebuild mangoh yellow layer ? Can i do that using Octave ? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [September 24, 2020, 10:35am UTC](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245/20 "2020-09-24T10:35:44Z")
There are steps here > **[GitHub - mangOH/mangOH: Primary mangOH git repository](https://github.com/mangOH/mangOH)** > > Primary mangOH git repository. Contribute to mangOH/mangOH development by creating an account on GitHub. Here is an example on how to build for mango red > [@Couldn't find file 'io.api'](https://mangoh.discourse.group/t/couldnt-find-file-io-api/4495/2): > > I don’t see problem with the R13.3 components: [https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-13,-d-,1-components/#sthash.13BE7Elj.dpbs](https://source.sierrawireless.com/resources/airprime/software/wp76xx/wp76xx-firmware-release-13,-d-,1-components/#sthash.13BE7Elj.dpbs) 1.Install the toolchain by sh poky-swi-ext-glibc-x86\_64-meta-toolchain-swi-armv7a-neon-toolchain-swi-SWI9X07Y\_02.28.03.05.sh Build the legato framework cd /home/owner/legato/packages/legato.framework.19.2.0.wp76xx-201906171244/resources/legato make clean . bin/configlegatoenv make wp76xx source ./build/wp7… [Next page](https://mangoh.discourse.group/t/mangoh-yellow-can-iot-bus-not-working/5245.md?page=2)