/*
* Main application routine.
*/
int main(void)
{
uint32_t baud = 115200;
/*
* Register the UART device, open it, assign stdout to it and set
* the baudrate.
*/
NutRegisterDevice(&DEV_CONSOLE, 0, 0);
freopen(DEV_CONSOLE.dev_name, "w", stdout);
_ioctl(_fileno(stdout), UART_SETSPEED, &baud);
puts("\n\nNut/OS timer sample");
/*
* Display some general info.
*/
printf("CPU running at %lu Hz\n", NutGetCpuClock());
printf("%lu system ticks per second\n", NutTimerMillisToTicks(1000));
/*
* Run the demos.
*/
OneShotDemo(10);
PeriodicDemo(2);
DelayDemo();
SleepDemo(); /* Never returns. */
return 0;
}
/*!
* \brief Start a system timer.
*
* The function returns immediately, while the timer runs
* asynchronously in the background.
*
* The timer counts for a specified number of milliseconds,
* then calls the callback routine with a given argument.
*
* Even after the timer elapsed, the callback function is not executed
* before the currently running thread is ready to give up the CPU. Thus,
* system timers may not fulfill the required accuracy. For precise or
* high resolution timing, native timer interrupt routines are a better
* choice.
*
* \param ms Specifies the timer interval in milliseconds. The
* resolution is limited to the granularity of the system
* timer.
* \param callback Identifies the function to be called on each
* timer interval.
* \param arg The argument passed to the callback function.
* \param flags If set to TM_ONESHOT, the timer will be stopped
* after the first interval. Set to 0 for periodic
* timers.
*
* \return Timer handle if successfull, 0 otherwise. The handle
* may be used to stop the timer by calling TimerStop.
*/
HANDLE NutTimerStart(uint32_t ms, void (*callback) (HANDLE, void *), void *arg, uint8_t flags)
{
return NutTimerStartTicks(NutTimerMillisToTicks(ms), callback, arg, flags);
}
