/ * @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 ******************************************************************************/
| 63 | * @return Base 2 logarithm of input, as used by fixed prescalers |
| 64 | ******************************************************************************/ |
| 65 | __STATIC_INLINE uint32_t BURTC_DivToLog2(uint32_t div) |
| 66 | { |
| 67 | uint32_t log2; |
| 68 | |
| 69 | /* Prescaler accepts an argument of 128 or less, valid values being 2^n */ |
| 70 | EFM_ASSERT((div > 0) && (div <= 32768)); |
| 71 | |
| 72 | /* Count leading zeroes and "reverse" result, Cortex-M3 intrinsic */ |
| 73 | log2 = (31 - __CLZ(div)); |
| 74 | |
| 75 | return log2; |
| 76 | } |
| 77 | |
| 78 | |
| 79 | /******************************************************************************* |