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@expeedo.de <mailto:dexter@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
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