title: differences between s37 and elf files
body: <p>I use embedded system. After the C source code building I get many files. The file name is the same, but the extension is different:</p>
  
  <p>.s37
  .elf
  .hex
  .sig</p>
  
  <p>What is the differences between them? Mainly what is the differences between .s37 and .elf?</p>
  
  <p>Thanks,
  L.</p>