XXX_Open
Description
This function marks the given CAN device as used, e.g. it locks the device. The return value is the identifier of the device and must be used for further actions with this device.
Prototype
CPU_INT16SXXX_Open(CPU_INT16S drv,
CPU_INT32U devName,
CPU_INT16U mode);
| Parameter | Meaning |
|---|---|
| drv | bus node name which must be used by the interrupt routine to access the can bus layer. |
| devName | device name which indicates the device within the controller |
| mode | not used |
Return Value
Device identifier for success or -1 if an error occurs.
Note:
Separation of bus node from driver device is necessary when different CAN modules are used, i.e. on a processor with integrated CAN module and also external CAN module(s).
Example: On a MPC565 processor TouCAN A, B, C are used and also 3 external SJA1000 CAN modules. Then 6 CAN nodes are available, but driver devices from TouCAN range 0-2 and driver devices from SJA1000 do also range from 0-2. To get unique device identification the bus node name is used. (see also chapter 5.1 Configure the CAN bus)