Function CMU_DivToLog2

bsp/efm32/Libraries/emlib/src/em_cmu.c:119–130

/ * @brief Convert dividend to prescaler logarithmic value. Only works for even * numbers equal to 2^n * @param[in] div Unscaled dividend, * @return Base 2 logarithm of input, as used by fixed prescalers ******************************************************************************/

 * @return Base 2 logarithm of input, as used by fixed prescalers
 ******************************************************************************/
__STATIC_INLINE uint32_t CMU_DivToLog2(CMU_ClkDiv_TypeDef div)
{
  uint32_t log2;

  /* Prescalers take argument of 32768 or less */
  EFM_ASSERT((div>0) && (div <= 32768));

  /* Count leading zeroes and "reverse" result, Cortex-M3 intrinsic */
  log2 = (31 - __CLZ(div));

  return log2;
}


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