HMS NETWORKS CANbridge NT Lua ADK Bridge Router User Guide

CAN@net NT/CANbridge NT Lua ADK  

C Funcons Called from Lua  

Funcon 'cyc.update_msg'  

cyc.update_msg(row, format, ident, payload)  

The uncon cyc.update_msgis used to start the transmission of messages and/or to update the message  

idener or data for transmission.  

• row: The row number in the "CAN-Gateway Conguraor" grid (0 to 127)  

• format: Combinaon of three characters to specify the message format, e. g.:  

– "csr"means: "classic CAN", "standard idener (11 bit)", "remote frame"  

– "fed"means: "CAN-FD", "extended idener (29 bit), "data frame"  

• ident: message idener  

• payload: data bytes of the message as arrayor table(see Funcon 'can.register_msg', p. 11)  

5.2.6. Module json  

The module jsonis oponal and has to be loaded via json= sys.dofile('json.lua').  

Funcon 'json.encode'  

json.encode(val)  

Serializes the provided value as JSON string. The result is returned. Allowed data types for valueare boolean,  

number, string, and table.  

Funcon 'json.decode'  

json.decode(st)  

De-serializes the provided JSON string. The result is returned.  

5.2.7. Module array  

The module arrayis loaded by default and directly available.  

Provides the data type arraywhich is a userdata byte array with up to 64 bytes, used for CAN messages  

payload.  

The module provides uncons to generate and modify byte arrays in C which is more ecien than doing this in  

Lua, like:  

• extractdata bytes from an array  

• insertdata bytes into an array  

• repackdata from one array into another  

Funcon 'array.new'  

a = array.new(64, 0)  

-- OR  

a = array.new({1, 2, 3, 4, 5 ,6 ,7 ,8})  

Creates a new instance of type array. The rs parameter is used as size (number of bytes) , the second  

parameter as inializaon value for the array.  

A provided table is used as list of inializaon values.  

Page 16 of 20  

4.02.0332.20002 Version 1.5  

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