Function CMU_ClockEnable

bsp/efm32/Libraries/emlib/src/em_cmu.c:936–987

/ * @brief * Enable/disable a clock. * * @details * In general, module clocking is disabled after a reset. If a module * clock is disabled, the registers of that module are not accessible and * reading from such registers may return undefined values. Writing to * registers of clock disabled modules have no effect. One should normally * avoid accessing module registers of a modu

 *   @li false - disable specified clock.
 ******************************************************************************/
void CMU_ClockEnable(CMU_Clock_TypeDef clock, bool enable)
{
  volatile uint32_t *reg;
  uint32_t          bit;
  uint32_t          sync = 0;

  /* Identify enable register */
  switch ((clock >> CMU_EN_REG_POS) & CMU_EN_REG_MASK)
  {
  case CMU_HFPERCLKDIV_EN_REG:
    reg = &(CMU->HFPERCLKDIV);
    break;

  case CMU_HFPERCLKEN0_EN_REG:
    reg = &(CMU->HFPERCLKEN0);
    break;

  case CMU_HFCORECLKEN0_EN_REG:
    reg = &(CMU->HFCORECLKEN0);
    break;

  case CMU_LFACLKEN0_EN_REG:
    reg  = &(CMU->LFACLKEN0);
    sync = CMU_SYNCBUSY_LFACLKEN0;
    break;

  case CMU_LFBCLKEN0_EN_REG:
    reg  = &(CMU->LFBCLKEN0);
    sync = CMU_SYNCBUSY_LFBCLKEN0;
    break;

  case CMU_PCNT_EN_REG:
    reg = &(CMU->PCNTCTRL);
    break;

  default: /* Cannot enable/disable clock point */
    EFM_ASSERT(0);
    return;
  }

  /* Get bit position used to enable/disable */
  bit = (clock >> CMU_EN_BIT_POS) & CMU_EN_BIT_MASK;

  /* LF synchronization required? */
  if (sync)
  {
    CMU_Sync(sync);
  }

  /* Set/clear bit as requested */
  BITBAND_Peripheral(reg, bit, (unsigned int)enable);
}


/***************************************************************************//**