Sending GMLAN SWCAN High-voltage Wake-up Message using Visual Basic and the Gryphon DLL

This example illustrates a simple way to send a high-voltage wake-up message over a single wire CAN channel.

The following code snippet works under the assumption that a Gryphon session has been activated¹, and that the channel handle has been obtained² for the desired single-wire CAN channel.



Const GCANSWSTAT_HIVOLT = 4     ' from hw/dev_527.h

Dim tx_canframe(2) As Byte

tx_canframe(0) = &H1

tx_canframe(1) = &H23



Dim tx_gcframe As Long



tx_gcframe = dgCreateFrameHandle(FT_DATA)



dgSetHeaderLength(tx_gcframe, 2)

dgSetHeaderBits(tx_gcframe, 11)



dgSetErrorStatus(tx_gcframe, GCANSWSTAT_HIVOLT)



dgSetPayload(tx_gcframe, tx_canframe(0))

gSendFrame(hSession, hChannel, tx_gcframe)

Note that in the above code snippet, function call return value checking is omitted in order to more clearly demonstrate the required logic. In a real program, however, it is strongly recommended that every return value be checked for error conditions, and acted upon accordingly.

Footnotes

1 See dgBeginSession(), Gryphon C Library User's Manual, Dearborn Group Inc.
2 See dgGetChannel(), Gryphon C Library User's Manual, Dearborn Group Inc.