答复: 答复: low can service

Hi, sorry forn the delay,

Could you send me the log messages of the binding please ? You could find the log using the journalctl command:

Also, I saw this line in the Dashboard.qml:

So, the engineSpeed would be received but divided but 65535, so there isn't so much left after that. And always be near to 0.

BR

Hi Romain，

I am testing AGL's DASHBOARD with vcan,  VehicleAvgSpeed work well, but PT_EngineSpeed(RPM) shows no change.

I have already enable vcan，edit the mapping file，restart vcan service.

Signals.json: EngineSpeed id  0x3D9

Could you give some hints? Thanks.

Hardware: m3ulcb&kingfish m06 / RPI 3B

AGL:GG RC4

Cmd：cansend vcan0 3D9#00003A

BR

Li

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发件人: automotive-discussions-bounces@xxxxxxxxxxxxxxxxxxxxxxxxx

[mailto:automotive-discussions-bounces@xxxxxxxxxxxxxxxxxxxxxxxxx] 代表

Romain Forlot

发送时间: 2018年10月16日 16:44

收件人: automotive-discussions@xxxxxxxxxxxxxxxxxxxxxxxxx

主题: Re: [agl-discussions] low can service

Ho, yes, correct.

I forgot the dashboard app.

The low-can try to open the socket if the /etc/dev-mapping.conf exists and

correctly set but if your CAN interface doesn't exists then you'll see error

messages:

DEBUG: [API low-can] BCM socket ifr_name is : can0

ERROR: [API low-can] ioctl failed. Error was : No such device

This will not fail the binding which continues to operate. As we might have

several CAN buses, like in a real car, the binding should be able to process the

operational buses even if one is failing. Here, it doesn't exists at all and the

binding lacks some recovery capabilities which, for example, would retry to

connect to a socket if this one failed.

I think that the binding should not fails completely if a bus comes down. I'm

open to discussion about that, binder have also some recovery capabilities

which retries a connection to a failed/disconnected binding, we could imagine

to relaunch the binding until is fine but then the CAN service would be more

degraded than running with errors on one of its bus. Also, we maybe needs to

define priorities or level of importance on certain buses and not the other which

would define which ones are considerate as mandatory to be up and running,

and others with lower importance would be ignored even if failing.

The binding have some lacks here but will be improved, thanks.

Best regards.

On 16/10/2018 04:55, Jason Reich wrote:

Hi Romain and Giuseppe,

The sample app "dashboard" app also uses the low can service, and will

show the vehicle speed on the UI if the low-can service detects the

correct message.  If you setup a vcan interface with low-can, and then

run "cansend vcan0 3e9#22" the speed should change on the UI.  Make

sure the vcan interface is up before starting the low-can service and

dashboard app.

Hope that helps,

Jason.

----------------------------------------------------------------------

--

On 10/10/18 12:29 PM, "Romain Forlot [IoT.bzh]"

<romain.forlot@xxxxxxx> wrote:

 Humm, I don't think that there is an existing apps that use the

low-can  API except the signal-composer for now which is also

installed by  default but the low-can configuration isn't activated by default.

Anyway, signal-composer is also a service without UI. I suggest you

to  read the usage guide of the low-can service here :

http://docs.automotivelinux.org/docs/apis_services/en/dev/reference/s

ignaling/low-can-usage-guide.html

If you haven't already read it. :)

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