[meta-freescale] FlexCAN in imx6q-sabresdb

[Keskinarkaus, Teemu]

Hi,

After setting up the pinctrl I was able to get the can-interface appear and also Flexcan module prints when I load it and when bring up the can - interface.

After turning the CAN transceiver on (standby-mode off) I measured the TX/RX-lines. I had other machine sending CAN-messages (two nodes so one would ack the others msgs) and in RX-line I could see the frames just fine. Flexcan driver did not receive any of the frames though.  When trying to send I got out one frame (measured from TX-line) and it didn't look like CAN-frame at all. Bittimining seemed to be kind a okay, but the bits themselves were coming out way too slow and it was just one frame that came out. If I wanted to send other frame I had to bring the can - interface down and back up.

Is there some clock source I need to configure for the Flexcan or what might be the problem?

Previously I've been working only with 2.6-series kernel so this whole 3.x - series kernel hw config thing is strange to me and I'm still learning it.

Teemu Keskinarkaus
Software system engineer

maximatecc
making machines smart, safe and productive

> -----Original Message-----
> From: meta-freescale-bounces at yoctoproject.org [mailto:meta-freescale-
> bounces at yoctoproject.org] On Behalf Of Gary Thomas
> Sent: 13. toukokuuta 2015 14:28
> To: meta-freescale at yoctoproject.org
> Subject: Re: [meta-freescale] FlexCAN in imx6q-sabresdb
>
> On 2015-05-13 04:38, Keskinarkaus, Teemu wrote:
> > Hi,
> >
> > I'm trying to get FlexCAN driver to work in imx6q-sabre-sdb - develboard
> without any success.
> >
> > I have added FlexCAN driver as a module in kernel config as well as the other
> CAN-devices/drivers needed (can,can-dev, can-raw).
> >
> > Also I added to arch/arm/boot/dts/imx6q-sabresd.dts following lines:
> >
> > ----
> >
> > &flexcan1{
> >
> >                  status = "okay";
> >
> > };
> >
> > ----
>
> Check the pin mux for the device.  You'll probably need something like this to get
> it to work:
>
> &flexcan1 {
>       pinctrl-names = "default";
>       pinctrl-0 = <&pinctrl_flexcan1_1>;
>       status = "okay";
> };
>
> >
> > After recompiling kernel and programming it to device, when I modprobe
> > flexcan - module nothing happens. It doesn't print that flexcan is
> > found and when I add the other CAN-modules and try to access CAN0(or CAN1)
> they claim that there is no such device. I've worked with FlexCAN in imx537 so
> I'm somewhat familiar how to access it, but problem is that it does not show up
> at all.
> >
> > Is there something else needed to do to get FlexCAN working with imx6q? I did
> search the internet, but didn't find anything else what should be done.
> >
> > Yocto version is 1.7.1 and kernel version is  linux-imx-rt-3.10.17.
> >
> > *Teemu Keskinarkaus
> > *Software system engineer*
> > *Cell: +358 400 330047*
> > *Fax: +358 207 669199*
> > *www.maximatecc.com <http://www.maximatecc.com/>*
> >
> > ***
> >
> > *maximatecc*
> >
> > making machines smart, safe and productive
> >
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> --
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
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