/// Emulation of Arduino's millis() functionality on AVR32
/// \bug doesn't handle cycle counter wraparound very well
long millis(void)
{
static long count = 0;
static long milliseconds = 0;
// Read CPU cycle counter and convert to millisecond difference
long newcount = Get_sys_count();
if (newcount < count) // cycle counter has wrapped since last update.
{
milliseconds += cpu_cy_2_ms(newcount, FCPU_HZ);
}
else
{
milliseconds += cpu_cy_2_ms(newcount - count, FCPU_HZ);
}
count = newcount;
return milliseconds;
}
/**
* @brief get system's internal tick count.
* Used for time reference.
* @return current tick count.
**/
unsigned long inv_get_tick_count(void)
{
const long cpu_hz = 12000000;
long count, ms;
count = Get_system_register(AVR32_COUNT);
ms = cpu_cy_2_ms(count,cpu_hz);
return ms;
}
uint32_t time_tick_calc_delay(uint32_t tick_start, uint32_t tick_end)
{
return cpu_cy_2_ms(tick_end - tick_start, sysclk_get_cpu_hz());
}
