HMS NETWORKS CANbridge NT Lua ADK Bridge Router User Guide

CAN@net NT/CANbridge NT Lua ADK  

C Funcons Called from Lua  

-- copy only 2 bytes from the source array  

format = array.compile("#1,0,#2,0x55")  

dest_array = array.repack(format, src_array)  

-- this corresponds to  

dest_array[1] = src_array[1]  

dest_array[2] = 0  

dest_array[3] = src_array[2]  

dest_array[4] = 0x55  

References to addional uncon parameters are also possible:  

-- copy 2 byte variables and 2 bytes from the source array to the  

destination array  

format = array.compile("@1,@2,#3,#4")  

dest_array = array.repack(format, src_array, var1, var2)  

-- this corresponds to  

dest_array[1] = var1  

dest_array[2] = var2  

dest_array[3] = src_array[3]  

dest_array[4] = src_array[4]  

Important to know:  

• The length of the desnaon array is directly given by the format string length.  

• The maximum value for a reference (e.g. #8) is the source array length.  

• The maximum number for variable references (e.g. @1) is 32.  

• Valid value for variables are 0to 255(unsigned byte).  

• The maximum value for a constant is 255, or 0xff.  

Funcon 'array.repack'  

dest_array = array.repack(format, src_array)  

Packs the data from the array src_arrayaccording to the compiled format string formatand returns the  

result array.  

Valid Operaons on Arrays  

Read a value:  

val = a[2]  

Write a value:  

a[l] = val  

Size of the array:  

num_bytes = #a  

Page 18 of 20  

4.02.0332.20002 Version 1.5  

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