title: Can anyone explain the concatenation on #define like that:
body: <pre><code>#define CONC_BIT(b7,b6,b5,b4,b3,b2,b1,b0) Conc_help(b7,b6,b5,b4,b3,b2,b1,b0)
  #define Conc_help(b7,b6,b5,b4,b3,b2,b1,b0) 0b##b7##b6##b5##b4##b3##b2##b1##b0
  </code></pre>
  
  <p>The goal of this code "in embedded system" to concatenate all 8 pins in one                   called port in "Digital Input Output"               </p>