LM3S9B96的EPI总线的HB16模式配置

equired by lwIP library to support any host-related timer functions.
//
//*****************************************************************************
void lwIPHostTimerHandler(void)
{
}

//*****************************************************************************
//
// The interrupt handler for the SysTick interrupt.
//
//*****************************************************************************
void SysTickIntHandler(void)
{
// Call the lwIP timer handler.
lwIPTimer(SYSTICKMS);

// Run the file system tick handler.
fs_tick(SYSTICKMS);
}