title: How to build a lookup table in C (SDCC compiler) with linear interpolation
body: <p>For a LPC922 microcontroller (with SDCC) I want to create a lookup table with linear interpolation.
  Lets assume I got x and y values like</p>
  
  <pre><code>x=300 y=10,0201 
  x=700 y=89,542 
  x=800 y=126,452 
  x=900 y=171,453 
  x=1500 y=225,123
  </code></pre>
  
  <p>How can the code for a lookup table with linear interpolation look like, so I get for example for x=850 the right value for y ((171,453+126,452)/2)?</p>