[Ovmsdev] Coding help

[Michael Balzer]

Shane,

on OBD polling basics: 
http://lists.openvehicles.com/pipermail/ovmsdev/2020-December/014758.html

Regards,
Michael


Am 04.03.21 um 19:45 schrieb Shane @ Kilve Engineering:
> Good evening Michael,
>
> Or any one that has the time to help,
>
> Ive now successfully retrieved as much info as I can without polling 
> any info for the maxus, but I have have now found an ecu that responds 
> to pid requests.
>
> For example if I use the obdii pid scanner I get the loads of data 
> back and I’ve decoded some of it, just need a bit of guidance how to 
> write the code to get the same info
>
> A part of a scan is as follows
>
> Scan complete (7e3 e000-e100)
> Scan started : 2021-03-04 18:32:36 GMT
> Last response: 2021-03-04 18:32:39 GMT
> 7e3[7eb]:e000 00
> 7e3[7eb]:e001 64
> 7e3[7eb]:e002 4b
> 7e3[7eb]:e003 26 bc
> 7e3[7eb]:e004 00 07
> 7e3[7eb]:e005 2f
> 7e3[7eb]:e006 2e
> 7e3[7eb]:e007 02 00
> 7e3[7eb]:e008 01 ff
> 7e3[7eb]:e009 02 00
> 7e3[7eb]:e010 02 00
>
> I know that e003 is SOH = 26bc = 9916 /100 = 99.16% SOH
> And e002 is a temp 4b = 75 / 10 = 7.5 degrees
>
> So if some one can help me with an example of how to correctly code 
> this one I can work out the rest,
>
> Ive looked through various vehicles but everyone uses different 
> methods and I can’t seem to get one to work for me.
>
> Any help much appreciated
>
> Shane
>
>> On 15 Feb 2021, at 08:05, Michael Balzer <dexter at expeedo.de 
>> <mailto:dexter at expeedo.de>> wrote:
>>
>> Shane,
>>
>> I forgot to mention: if you're working on a new vehicle module, 
>> you'll also need to start the bus somewhere in your initialization 
>> code. Example:
>>
>>   RegisterCanBus(1, CAN_MODE_ACTIVE, CAN_SPEED_500KBPS);
>>
>> Regards,
>> Michael
>>
>>
>> Am 15.02.21 um 08:36 schrieb Michael Balzer:
>>> Shane,
>>>
>>> Am 14.02.21 um 16:42 schrieb Shane @ Kilve Engineering:
>>>> can any one help me with a bit of code to retrieve ve some data 
>>>> from ecu can1/6f2  00 4c 00 00 01 97 bc 00 as i cant poll this ecu 
>>>> it just broadcasts when its active, ive tried polling it but does 
>>>> not respond, i need to choose one byte and allocate it to a PID.
>>>
>>> I don't know what you mean by "allocating a byte to a PID", but if 
>>> you want to process frames received directly, simply override 
>>> IncomingFrameCan1() (or …2/3/4 depending on your bus).
>>>
>>> Reduced example:
>>>
>>> void OvmsVehicleXYZ::IncomingFrameCan1(CAN_frame_t *p_frame)
>>> {
>>>   uint8_t *d = p_frame->data.u8;
>>>
>>>   switch (p_frame->MsgID)
>>>   {
>>>     case 0x6f2:
>>>       // for example, assuming the SOC is in byte 1:
>>>       StdMetrics.ms_v_bat_soc->SetValue(d[1]);
>>>       break;
>>>   }
>>> }
>>>
>>> If you're outside a vehicle context, you can register your own CAN 
>>> receiver by creating a queue and calling MyCan.RegisterListener(). 
>>> See the vehicle module for an example.
>>>
>>> Regards,
>>> Michael
>>>
>>

-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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