EFM32 Clocks – simple and short tutorial

Hello people,
Here some info about clocks in EFM32.
I’ll show you code snippet, for EFM32 that make work HF timers, LF timers, HF USART and LF USART.
I will not explain why those definitions work – you can read it in datasheet.
Simply, shortly, I’ll save your time by giving you an example below.
So….

void systemClocksInit(void) {
    /* Use crystal oscillator for HFXO */
    CMU->CTRL |= CMU_CTRL_HFXOMODE_XTAL;
    /* HFXO setup */
    CMU->CTRL = (CMU->CTRL & ~_CMU_CTRL_HFXOBOOST_MASK) | CMU_CTRL_HFXOBOOST_100PCENT;

    /* Enable HFXO as high frequency clock, HFCLK */
    CMU_ClockSelectSet(cmuClock_HF,cmuSelect_HFXO);

    /* Use crystal oscillator for LFXO */
    CMU->CTRL |= CMU_CTRL_LFXOMODE_XTAL;
    /* LFXO setup */
    CMU->CTRL = (CMU->CTRL & ~_CMU_CTRL_LFXOBOOST_MASK) | CMU_CTRL_LFXOBOOST_100PCENT;
    EMU->AUXCTRL = (EMU->AUXCTRL & ~_EMU_AUXCTRL_REDLFXOBOOST_MASK);

    /* Enable LFXO and wait for it to stabilize */
    CMU_OscillatorEnable(cmuOsc_LFXO, true, true);

    /* Select LFXO as clock source for LFACLK */
    CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFXO);

    CMU_ClockEnable(cmuClock_HFPER, true);
    CMU_ClockEnable(cmuClock_CORELE, true);
    /***********************************************************************/
    /*************** ENABLE CLOCKS OF PEREPHERIA ***************************/
    CMU_ClockEnable(cmuClock_GPIO, true);
    CMU_ClockEnable(cmuClock_USART0, true);
    CMU_ClockEnable(cmuClock_LEUART0, true);
    CMU_ClockEnable(cmuClock_LETIMER0, true);
    CMU_ClockEnable(cmuClock_TIMER0, true);
 }

Have a nice day! 🙂