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LinInterpol_I16

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Estimated reading time: 1 min
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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.
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/* 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();
    }
}
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