/**
* \brief Initializes SysTick.
*/
static void _hal_tcInit(void)
{
uint32_t l_ticks;
TIMER_TypeDef* ps_timer = TIMER1;
TIMER_Init_TypeDef s_timerInit = TIMER_INIT_DEFAULT;
s_timerInit.enable = true;
s_timerInit.prescale = timerPrescale2;
s_timerInit.riseAction = timerInputActionReloadStart;
/* caluclate ticks */
l_ticks = SystemHFClockGet() / 2 / 1000;
/* configure timer for 1ms */
TIMER_TopSet( ps_timer, l_ticks );
/* enable timer interrupts */
NVIC_DisableIRQ( TIMER1_IRQn );
NVIC_ClearPendingIRQ( TIMER1_IRQn );
NVIC_EnableIRQ( TIMER1_IRQn );
TIMER_IntEnable( ps_timer, TIMER_IEN_OF );
/* initialize and start timer */
TIMER_Init( ps_timer, &s_timerInit );
} /* _hal_tcInit() */
/***************************************************************************//**
* @brief
* Get the current core clock frequency.
*
* @details
* Calculate and get the current core clock frequency based on the current
* configuration. Assuming that the SystemCoreClock global variable is
* maintained, the core clock frequency is stored in that variable as well.
* This function will however calculate the core clock based on actual HW
* configuration. It will also update the SystemCoreClock global variable.
*
* @note
* This is an EFM32 proprietary function, not part of the CMSIS definition.
*
* @return
* The current core clock frequency in Hz.
******************************************************************************/
uint32_t SystemCoreClockGet(void)
{
uint32_t ret;
ret = SystemHFClockGet();
ret >>= (CMU->HFCORECLKDIV & _CMU_HFCORECLKDIV_HFCORECLKDIV_MASK) >>
_CMU_HFCORECLKDIV_HFCORECLKDIV_SHIFT;
/* Keep CMSIS variable up-to-date just in case */
SystemCoreClock = ret;
return ret;
}