title: C programming to control GPIO LED
body: <p>I have a hardware where I need to turn on LED connected in  GPIO( Looking at hardware specs, GPIO BCBUSB0 is connected to LED) to show that software is running fine inside it. If for some reason software is not running , then LED should turn off or become red.</p>
  
  <p>Now , I thought I should set up a watchdog or something which sends signal to Led in regular interval to show status that software is running. if for some reason LEd does not receive signal with particular interval it should turn off. </p>
  
  <p>I am quite comfortable in using C language, but have no idea about programming GPIO to turn on/off LED. Any advice or suggestion will be of great help.</p>
  
  <p>Thanks </p>