RTEMS 4.7.0 On-Line Library

Real-Time Clock Driver checkRealTime

BSP and Device Driver Development Guide

11.7: checkRealTime

The checkRealTime routine returns the number of seconds difference between the RTC TOD and the current RTEMS TOD.

int checkRealTime( void )
{
  if no RTCs are present
    return -1


  obtain the RTEMS TOD using rtems_clock_get
  get the TOD from the preferred RTC using the deviceGetTime routine

  convert the RTEMS TOD to seconds
  convert the RTC TOD to seconds

  return the RTEMS TOD in seconds - RTC TOD in seconds
}

BSP and Device Driver Development Guide