[Ovmsdev] understanding polling

[Mark Webb-Johnson]

The Ampera is still using the old polling logic. The poling code is within the vehicle_voltampera module itself.

The Leaf is using the new centralised polling logic (in vehicle.h and vehicle.c). This is the new recommend way of doing this, as the vehicle.{h,c} code will do the polling for you - all you need to do is setup the appropriate structure.

The new structure is:

typedef struct
{
  unsigned int moduleid;
  unsigned int rmoduleid;
  unsigned char type;
  unsigned int pid;
  unsigned int polltime[VEHICLE_POLL_NSTATES];
} vehicle_pid_t;

and the following polling types are currently supported:

#define VEHICLE_POLL_TYPE_NONE          0x00
#define VEHICLE_POLL_TYPE_OBDIICURRENT  0x01
#define VEHICLE_POLL_TYPE_OBDIIVEHICLE  0x09
#define VEHICLE_POLL_TYPE_OBDIIGROUP    0x21
#define VEHICLE_POLL_TYPE_OBDIIEXTENDED 0x22

The moduleid is the replying module id, the rmoduleid is the id to use for the request.

Regards, Mark.

> On 21 Jun, 2015, at 9:44 pm, Nikolay Shishkov <nshishkov at yahoo.com> wrote:
> 
> Hi , 
> 
> I am trying to make nissan leaf work with normal cable - on the CARCAN.
> 
> I am trying to figure out the polling mechanism and I have trouble understanding what the different parameters in the configurations are. 
> 
> In the ampera file I can see:
> rom struct
>   {
>   unsigned int moduleid;
>   unsigned char polltime;
>   unsigned int pid;
>   } vehicle_voltampera_polls[]
>   =
>   {
>     { 0x07E0, 10, 0x000D },
>     { 0x07E4, 10, 0x4369 },
>     { 0x07E4, 10, 0x4368 },
>     { 0x07E4, 10, 0x801f },
>     { 0x07E4, 10, 0x801e },
>     { 0x07E4, 10, 0x434f },
>     { 0x07E4, 10, 0x1c43 },
>     { 0x07E4, 10, 0x8334 },
>     { 0x07E1, 100, 0x2487 },
>     { 0x0000, 0,  0x0000 }
>   };
> 
> While in the nissan leaf file I can see the following:
> 
> rom  vehicle_pid_t vehicle_nissanleaf_polls[]
>   =
>   {
>     { 0x797, 0x79a, VEHICLE_POLL_TYPE_OBDIICURRENT, 0x0d, {  10, 10, 0 } }, // Speed
>     { 0x797, 0x79a, VEHICLE_POLL_TYPE_OBDIIVEHICLE, 0x02, {  10, 10, 0 } }, // VIN
>     { 0, 0, 0x00, 0x00, { 0, 0, 0 } }
>   };
> 
> I can kind of guess some of it. 
> I also found an old e-mail from Mark that describes a structure similar to the one in the nissan leaf file, but the leaf has one extra parameter - I think it is the return message can Id. 
> 
> Any info/advice is appreciated!
> 
> Nikolay
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