| //***************************************************************************** |
| // |
| //! @file am_util_math.c |
| //! |
| //! @brief A few useful math functions. |
| //! |
| //! Functions for performing some number manipulation. |
| // |
| //***************************************************************************** |
| |
| //***************************************************************************** |
| // |
| // Copyright (c) 2017, Ambiq Micro |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // |
| // 2. 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. |
| // |
| // 3. 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. |
| // |
| // This is part of revision v1.2.10-2-gea660ad-hotfix2 of the AmbiqSuite Development Package. |
| // |
| //***************************************************************************** |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include "am_util_math.h" |
| |
| //***************************************************************************** |
| // |
| //! @brief Converts a Binary Coded Decimal (BCD) byte to its Decimal form. |
| //! |
| //! @param ui8BCDByte is a BCD byte. |
| //! |
| //! This function is useful when working with RTC's as they tend to be in BCD |
| //! format. |
| //! |
| //! @returns the BCD byte converted to Decimal |
| // |
| //***************************************************************************** |
| uint8_t |
| am_util_math_bcd_to_dec(uint8_t ui8BCDByte) |
| { |
| return (((ui8BCDByte & 0xF0) >> 4) * 10) + (ui8BCDByte & 0x0F); |
| } |
| |
| //***************************************************************************** |
| // |
| //! @brief Converts a Decimal byte to its Binary Coded Decimal (BCD) form. |
| //! |
| //! @param ui8DecimalByte is a Decimal byte. |
| //! |
| //! This function is useful when working with RTC's as they tend to be in BCD |
| //! format. |
| //! |
| //! @returns the Decimal byte converted to BCD. |
| // |
| //***************************************************************************** |
| uint8_t |
| am_util_math_dec_to_bcd(uint8_t ui8DecimalByte) |
| { |
| return (((ui8DecimalByte / 10) << 4) | (ui8DecimalByte % 10)); |
| } |
| |
