| /* |
| * Copyright (c) 2016, Freescale Semiconductor, Inc. |
| * Copyright 2016-2017 NXP |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * o Redistributions of source code must retain the above copyright notice, this list |
| * of conditions and the following disclaimer. |
| * |
| * o Redistributions in binary form must reproduce the above copyright notice, this |
| * list of conditions and the following disclaimer in the documentation and/or |
| * other materials provided with the distribution. |
| * |
| * o Neither the name of the copyright holder nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR |
| * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "fsl_fmeas.h" |
| |
| /******************************************************************************* |
| * Definitions |
| *******************************************************************************/ |
| |
| /*! @brief Target clock counter value. |
| * According to user manual, 2 has to be subtracted from captured value (CAPVAL). */ |
| #define TARGET_CLOCK_COUNT(base) \ |
| ((uint32_t)( \ |
| ((((SYSCON_Type *)base)->FREQMECTRL & SYSCON_FREQMECTRL_CAPVAL_MASK) >> SYSCON_FREQMECTRL_CAPVAL_SHIFT) - 2)) |
| |
| /*! @brief Reference clock counter value. */ |
| #define REFERENCE_CLOCK_COUNT ((uint32_t)((SYSCON_FREQMECTRL_CAPVAL_MASK >> SYSCON_FREQMECTRL_CAPVAL_SHIFT) + 1)) |
| |
| /******************************************************************************* |
| * Code |
| ******************************************************************************/ |
| |
| uint32_t FMEAS_GetFrequency(SYSCON_Type *base, uint32_t refClockRate) |
| { |
| uint32_t targetClockCount = TARGET_CLOCK_COUNT(base); |
| uint64_t clkrate = 0; |
| |
| if (targetClockCount > 0) |
| { |
| clkrate = (((uint64_t)targetClockCount) * (uint64_t)refClockRate) / REFERENCE_CLOCK_COUNT; |
| } |
| |
| return (uint32_t)clkrate; |
| } |