Echelon LonTal Stack - Manual (Page 41)

LonTalk Stack Developer’s Guide 29
Updated Symbol File
Destination Folder on
Development Computer
Source/Target/Neuron/L2ML
IB/ Ver14/sys3150l2mlib.sym
C:/LonWorks/Images/Ver14
Source/Target/Neuron/L2ML
IB/ Ver14/sys3150l2mlib.nx
C:/LonWorks/Images/Ver14
Defining Incoming Layer 2 Packet Buffers
You can define incoming Layer 2 packet buffers using the following syntax:
[length] [miCOMM|miINCOMINGL2] [backlog/altpath] NPDU [CRC_HI]
[CRC_LO]
The length field includes the 2 bytes before the NPDU, the NPDU itself, and the
two CRC bytes.
Functions
The following table describes the functions included in the l2mlib.h file that you
can use to create a custom network interface.
Function Syntax Description
l2ml_gol2()
extern system far void
l2ml_gol2(void);
Switches the network
processing to L2 mode. If it
is already in L2 mode, this
method does nothing. You
can return to the scheduler
when in L2 mode as the
network processor believes
there is no incoming traffic.
l2ml_gol5() extern system far void
l2ml_gol5(void); Switches the network
processing to L5 mode. If it
is already in L5 mode, this
method does nothing.
l2ml_getl2packet()
extern system far
unsigned
*l2ml_getl2packet(void);
Returns any L2 packet
buffers in the receive queue.
This method returns NULL
if there are no L2 packet
buffers available.