File content as of revision 39:cb0e5a76ab15:

/*
 / _____)             _              | |
( (____  _____ ____ _| |_ _____  ____| |__
 \____ \| ___ |    (_   _) ___ |/ ___)  _ \
 _____) ) ____| | | || |_| ____( (___| | | |
(______/|_____)_|_|_| \__)_____)\____)_| |_|
    (C)2013 Semtech

  _    _            _____   _______
 | |  | |          |_   _| |__   __|
 | |__| | __ ___  __ | |  ___ | |
 |  __  |/ _` \ \/ / | | / _ \| |
 | |  | | (_| |>  < _| || (_) | |
 |_|  |_|\__,_/_/\_\_____\___/|_|
    (C)2017 HaxIoT

Description: Helper functions implementation

License: Revised BSD License, see LICENSE.TXT file include in the project

Maintainer: Miguel Luis and Gregory Cristian
            Fahad Mirza (Haxiot)
*/
 /******************************************************************************
  * @file    utilities.h
  * @author  MCD Application Team
  * @version V1.1.4
  * @date    08-January-2018
  * @brief   Header for driver utilities.c module
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics International N.V. 
  * All rights reserved.</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without 
  * modification, are permitted, provided that the following conditions are met:
  *
  * 1. Redistribution 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 STMicroelectronics nor the names of other 
  *    contributors to this software may be used to endorse or promote products 
  *    derived from this software without specific written permission.
  * 4. This software, including modifications and/or derivative works of this 
  *    software, must execute solely and exclusively on microcontroller or
  *    microprocessor devices manufactured by or for STMicroelectronics.
  * 5. Redistribution and use of this software other than as permitted under 
  *    this license is void and will automatically terminate your rights under 
  *    this license. 
  *
  * THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS" 
  * AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT 
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
  * PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
  * RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT 
  * SHALL STMICROELECTRONICS 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.
  *
  ******************************************************************************
  */
#ifndef __UTILITIES_H__
#define __UTILITIES_H__

#include "stm32l0xx_hal.h"


/* BACKUP_PRIMASK MUST be implemented at the beginning of the function
 * that implement a critical section.
 * PRIMASK is saved on STACK and recovered at the end of the function.
 * That way RESTORE_PRIMASK ensures that no irq would be triggered in case of
 * unbalanced enable/disable, reentrant code etc.
 */
#define BACKUP_PRIMASK()  uint32_t primask_bit= __get_PRIMASK()
#define DISABLE_IRQ() __disable_irq()
#define ENABLE_IRQ() __enable_irq()
#define RESTORE_PRIMASK() __set_PRIMASK(primask_bit)

/* prepocessor directive to align buffer*/
#define ALIGN(n)             __attribute__((aligned(n)))

/*!
 * \brief Returns the minimum value between a and b
 *
 * \param [IN] a 1st value
 * \param [IN] b 2nd value
 * \retval minValue Minimum value
 */
#define MIN( a, b ) ( ( ( a ) < ( b ) ) ? ( a ) : ( b ) )

/*!
 * \brief Returns the maximum value between a and b
 *
 * \param [IN] a 1st value
 * \param [IN] b 2nd value
 * \retval maxValue Maximum value
 */
#define MAX( a, b ) ( ( ( a ) > ( b ) ) ? ( a ) : ( b ) )

/*!
 * \brief Returns 2 raised to the power of n
 *
 * \param [IN] n power value
 * \retval result of raising 2 to the power n
 */
#define POW2( n ) ( 1 << n )

/*!
 * \brief  Find First Set
 *         This function identifies the least significant index or position of
 *         the bits set to one in the word
 *
 * \param [in]  value  Value to find least significant index
 * \retval bitIndex    Index of least significat bit at one
 */
__STATIC_INLINE uint8_t __ffs( uint32_t value )
{
    return( uint32_t )( 32 - __CLZ( value & ( -value ) ) );
}

/*!
 * \brief Initializes the pseudo random generator initial value
 *
 * \param [IN] seed Pseudo random generator initial value
 */
void srand1( uint32_t seed );

/*!
 * \brief Computes a random number between min and max
 *
 * \param [IN] min range minimum value
 * \param [IN] max range maximum value
 * \retval random random value in range min..max
 */
int32_t randr( int32_t min, int32_t max );

/*!
 * \brief Copies size elements of src array to dst array
 *
 * \remark STM32 Standard memcpy function only works on pointers that are
 *         aligned
 *
 * \param [OUT] dst  Destination array
 * \param [IN]  src  Source array
 * \param [IN]  size Number of bytes to be copied
 */
void memcpy1( uint8_t *dst, const uint8_t *src, uint16_t size );

/*!
 * \brief Copies size elements of src array to dst array reversing the byte
 *        order
 *
 * \param [OUT] dst  Destination array
 * \param [IN]  src  Source array
 * \param [IN]  size Number of bytes to be copied
 */
void memcpyr( uint8_t *dst, const uint8_t *src, uint16_t size );

/*!
 * \brief Set size elements of dst array with value
 *
 * \remark STM32 Standard memset function only works on pointers that are
 *         aligned
 *
 * \param [OUT] dst   Destination array
 * \param [IN]  value Default value
 * \param [IN]  size  Number of bytes to be copied
 */
void memset1( uint8_t *dst, uint8_t value, uint16_t size );

/*!
 * \brief Converts a nibble to an hexadecimal character
 *
 * \param [IN] a   Nibble to be converted
 * \retval hexChar Converted hexadecimal character
 */
int8_t Nibble2HexChar( uint8_t a );

/*!
 * \brief Converts an array of character hex digits
 *        into an array of byte-hex
 *
 * \param [IN]  hexString Hex string to be converted
 *        [IN]  buffer    Container to save the conversion
 *        [IN]  bufSize   Size of the container
 *
 * \retval [OUT] uint8_t  Size of the buffer after conversion
 *
 * \note   It is assumed that the bufSize won't be larger than 256
 */
uint8_t stringHexToByteArray(const char *hexString, uint8_t *buffer, uint8_t bufSize);

#endif // __UTILITIES_H__