Function MSC_Init

bsp/efm32/Libraries/emlib/src/em_msc.c:61–102

/ * @brief * Enables the flash controller for writing. * @note * IMPORTANT: This function must be called before flash operations when * AUXHFRCO clock has been changed from default 14MHz band. ******************************************************************************/

 *   AUXHFRCO clock has been changed from default 14MHz band.
 ******************************************************************************/
void MSC_Init(void)
{
#if defined (_EFM32_TINY_FAMILY) || defined(_EFM32_GIANT_FAMILY)
  uint32_t freq, cycles;
#endif
  /* Enable writing to the MSC */
  MSC->WRITECTRL |= MSC_WRITECTRL_WREN;
  /* Unlock the MSC */
  MSC->LOCK = MSC_UNLOCK_CODE;
  /* Disable writing to the MSC */
  MSC->WRITECTRL &= ~MSC_WRITECTRL_WREN;

#if defined (_EFM32_TINY_FAMILY) || defined(_EFM32_GIANT_FAMILY)
  /* Configure MSC->TIMEBASE according to selected frequency */
  freq = CMU_ClockFreqGet(cmuClock_AUX);

  if( freq > 7000000)
  {
    /* Calculate number of clock cycles for 1us as base period */
    freq = (freq * 11) / 10;
    cycles = (freq / 1000000) + 1;

    /* Configure clock cycles for flash timing */
    MSC->TIMEBASE = (MSC->TIMEBASE & ~(_MSC_TIMEBASE_BASE_MASK|
                                       _MSC_TIMEBASE_PERIOD_MASK))|
                     MSC_TIMEBASE_PERIOD_1US|
                     (cycles << _MSC_TIMEBASE_BASE_SHIFT);
  }
  else
  {
    /* Calculate number of clock cycles for 5us as base period */
    freq = (freq * 5 * 11) / 10;
    cycles = (freq / 1000000) + 1;

    /* Configure clock cycles for flash timing */
    MSC->TIMEBASE = (MSC->TIMEBASE & ~(_MSC_TIMEBASE_BASE_MASK|
                                       _MSC_TIMEBASE_PERIOD_MASK))|
                     MSC_TIMEBASE_PERIOD_5US|
                     (cycles << _MSC_TIMEBASE_BASE_SHIFT);
  }
#endif
}

/***************************************************************************//**
 * @brief