Prototype
LinInterpol_I16(rStart, rEnd, val)
Description
Linear interpolation. The array of points (4 bytes for each point, two int16, x and y) is determined by the positions rStart and rEnd (inclusive).
The x coords must be monotonically increasing and x1. . . xn must never be the same values.
val is the input value.
Return
Interpolation result.
Code Example
The following code example uses the LinInterpol_I16 function.
The SMK900.evi file used for this example can be downloaded at the bottom of this page.
/* Example Code
* LinInterpol_I16
*
* get buffer indexes r1, r2 and idx
* set buffer in memory
* interpol value at idx
* if params used
* return result of interpol on 16 bits
* else
* return 0x00 (lookup pas ok) or 0x01 (lookup ok)
*
* example VMExecuteCmd:
* cmd: |r1 |r2 |idx |buffer
* 0xfb 0x0e 0x00 0x0c 0x00 0x0e [0x?? 0x?? 0x?? = macAdress] 0x00 0x00 0x04 0x00 0x02 0x00 0x01 0x00 0xFF 0xFF 0x05 0x00 0xFB 0xFF
* rsp: 0xfb 0x08 0x00 0x2d 0x00 0xe1 0x1e 0xfe 0xff
*/
#include "SMK900.evi"
#define SENSORCODE 0x01
function exec_aircmd(){
local rxLen;
local useParams;
local r1,r2,idx;
local i;
local result;
rxLen=GetAirBuf(0, 0, 20);
if(rxLen>=15){ // 1 byte for paketID + 14 bytes of payload (6 bytes for indexes and minimum 8 bytes for buffer)
useParams=true;
r1=GetBuffer_16(1);
r2=GetBuffer_16(3);
idx=GetBuffer_16(5);
for(i=7;i<rxLen;i++){
SetBuffer(i-7,GetBuffer_S8(i),1);
}
}else{
useParams=false;
r1=0;
r2=4;
idx=2;
SetBuffer_16(0,0x0001);
SetBuffer_16(2,0xFFFF);
SetBuffer_16(4,0x0005);
SetBuffer_16(6,0xFFFB);
}
result = LinInterpol_I16(r1,r2,idx);
if(useParams){
SetBuffer_16(0,result);
Send(2);
}else{
if(result==0xFFFE){
result = 1;
}else{
result = 0;
}
SetBuffer(0,result,1);
Send(1);
}
}
function main()
{
local execType;
execType = GetExecType();
if(execType==MESHEXECTYPE_AIRCMD_bm){
exec_aircmd();
}
}