[Ovmsdev] Coding help
Shane @ Kilve Engineering
shane at kilve-engineering.co.uk
Fri Mar 5 02:45:11 HKT 2021
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]:e003 26 bc
7e3[7eb]:e004 00 07
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
> On 15 Feb 2021, at 08:05, Michael Balzer <dexter at expeedo.de> wrote:
> 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);
> Am 15.02.21 um 08:36 schrieb Michael Balzer:
>> 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:
>> 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.
> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
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