DriverOpenH (FUN)¶

FUNCTION DriverOpenH : CAA.HANDLE

Opens a CAN interface and allocates memory from heap. Not every hardware supports each baud rate. If a baud rate is not supported or if the interface cannot be opened due to different reasons, the function returns CAA.gc_hINVALID. The function can be called several times on the same interface, so that multiple parts of a program can work on it. You can set uiBaudrate to 0 if the interface is already opened or if the default baudrate from configuration file should be used. See following section in configuration file:

[CmpCAACanL2]
PersistentBaudrate=1
Net.0.DefaultBaudrate=1000

Example

See Write.

InOut:

Scope	Name	Type	Comment
Return	`DriverOpenH`	`CAA.HANDLE`	handle of CAN interface or `CAA.gc_hINVALID` if failed.
Input	`usiNetId`	`USINT`	number of CAN interface [0..n]
	`uiBaudrate`	`UINT`	Baudrate in kBit/s e.g. 1000 for 1 Mbit
	`xSupport29Bits`	`BOOL`	`FALSE`: only 11-Bit IDs, `TRUE`: support also 29-Bit
	`ctMessages`	`CAA.COUNT`	number of transmit messages which should be allocated
	`peError`	POINTER TO ERROR	optional pointer to error enum