/*********************************************************************************************************
** @file:    core_cm0.c
** @purpose: CMSIS Cortex-M0 Core Peripheral Access Layer Source File
** @version: V1.0
** @date:    12. Nov. 2008
**--------------------------------------------------------------------------------------------------------
**
** Copyright (C) 2008 ARM Limited. All rights reserved.
**
** ARM Limited (ARM) is supplying this software for use with Cortex-M0 
** processor based microcontrollers.  This file can be freely distributed 
** within development tools that are supporting such ARM based processors. 
**
** THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
** OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
** ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
** CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
**
*********************************************************************************************************/
#include <stdint.h>

/*********************************************************************************************************
  define compiler specific symbols
*********************************************************************************************************/
#if defined ( __CC_ARM   )
  #define __ASM            __asm                                        /*!< asm keyword for armcc      */
  #define __INLINE         __inline                                     /*!< inline keyword for armcc   */

#elif defined ( __ICCARM__ )
  #define __ASM           __asm                                         /*!< asm keyword for iarcc      */
  #define __INLINE        inline                                        /*!< inline keyword for iarcc.  */
                                                                        /*!< Only avaiable in High      */
                                                                        /*!< optimization mode!         */
  #define __nop           __no_operation                                /*!< no operation intrinsic in  */
                                                                        /*!< iarcc                      */

#elif defined   (  __GNUC__  )
  #define __ASM             asm                                         /*!< asm keyword for gcc        */
  #define __INLINE          inline                                      /*!< inline keyword for gcc     */
#endif



#if (defined (__ARMCC_VERSION)) && (__ARMCC_VERSION < 400000)

/*********************************************************************************************************
** @brief  Return the Process Stack Pointer
**
** @param  none
** @return uint32_t ProcessStackPointer
**
** Return the actual process stack pointer
*********************************************************************************************************/
__ASM uint32_t __get_PSP(void)
{
    mrs r0, psp
    bx lr
}

/*********************************************************************************************************
** @brief  Set the Process Stack Pointer
**
** @param  uint32_t Process Stack Pointer
** @return none
**
** Assign the value ProcessStackPointer to the MSP 
** (process stack pointer) Cortex processor register
*********************************************************************************************************/
__ASM void __set_PSP(uint32_t topOfProcStack)
{
    msr psp, r0
    bx lr
}

/*********************************************************************************************************
** @brief  Return the Main Stack Pointer
**
** @param  none
** @return uint32_t Main Stack Pointer
**
** Return the current value of the MSP (main stack pointer)
** Cortex processor register
*********************************************************************************************************/
__ASM uint32_t __get_MSP(void)
{
    mrs r0, msp
    bx lr
}

/*********************************************************************************************************
** @brief  Set the Main Stack Pointer
**
** @param  uint32_t Main Stack Pointer
** @return none
**
** Assign the value mainStackPointer to the MSP 
** (main stack pointer) Cortex processor register
*********************************************************************************************************/
__ASM void __set_MSP(uint32_t mainStackPointer)
{
    msr msp, r0
    bx lr
}

/*********************************************************************************************************
** @brief  Return the Base Priority value
**
** @param  none
** @return uint32_t BasePriority
**
** Return the content of the base priority register
*********************************************************************************************************/
__ASM uint32_t  __get_BASEPRI(void)
{
    mrs r0, basepri
    bx lr
}

/*********************************************************************************************************
** @brief  Set the Base Priority value
**
** @param  uint32_t BasePriority
** @return none
**
** Set the base priority register
*********************************************************************************************************/
__ASM void __set_BASEPRI(uint32_t basePri)
{
    msr basepri, r0
    bx lr
}

/*********************************************************************************************************
** @brief  Return the Priority Mask value
**
** @param  none
** @return uint32_t PriMask
**
** Return the state of the priority mask bit from the priority mask
** register
*********************************************************************************************************/
__ASM uint32_t __get_PRIMASK(void)
{
    mrs r0, primask
    bx lr
}

/*********************************************************************************************************
** @brief  Set the Priority Mask value
**
** @param  uint32_t PriMask
** @return none
**
** Set the priority mask bit in the priority mask register
*********************************************************************************************************/
__ASM void __set_PRIMASK(uint32_t priMask)
{
    msr primask, r0
    bx lr
}

/*********************************************************************************************************
** @brief  Return the Fault Mask value
**
** @param  none
** @return uint32_t FaultMask
**
** Return the content of the fault mask register
*********************************************************************************************************/
__ASM uint32_t  __get_FAULTMASK(void)
{
    mrs r0, faultmask
    bx lr
}

/*********************************************************************************************************
** @brief  Set the Fault Mask value
**
** @param  uint32_t faultMask value
** @return none
**
** Set the fault mask register
*********************************************************************************************************/
__ASM void __set_FAULTMASK(uint32_t faultMask)
{
    msr faultmask, r0
    bx lr
}

/*********************************************************************************************************
** @brief  Return the Control Register value
** 
** @param  none
** @return uint32_t Control value
**
** Return the content of the control register
*********************************************************************************************************/
__ASM uint32_t  __get_CONTROL(void)
{
    mrs r0, control
    bx lr
}

/*********************************************************************************************************
** @brief  Set the Control Register value
**
** @param  uint32_t Control value
** @return none
**
** Set the control register
*********************************************************************************************************/
__ASM void __set_CONTROL(uint32_t control)
{
    msr control, r0
    bx lr
}

/*********************************************************************************************************
** @brief  Reverse byte order in unsigned short value
**
** @param  uint16_t value to reverse
** @return uint32_t reversed value
**
** Reverse byte order in unsigned short value
*********************************************************************************************************/
__ASM uint32_t __REV16(uint16_t value)
{
    rev16 r0, r0
    bx lr
}

/*********************************************************************************************************
** @brief  Reverse byte order in signed short value with sign extension to integer
**
** @param  int16_t value to reverse
** @return int32_t reversed value
**
** Reverse byte order in signed short value with sign extension to integer
*********************************************************************************************************/
__ASM int32_t __REVSH(int16_t value)
{
    revsh r0, r0
    bx lr
}



#elif (defined (__ICCARM__))
#pragma diag_suppress=Pe940

/*********************************************************************************************************
** @brief  Return the Process Stack Pointer
**
** @param  none
** @return uint32_t ProcessStackPointer
**
** Return the actual process stack pointer
*********************************************************************************************************/
uint32_t __get_PSP(void)
{
    __ASM("mrs r0, psp");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  Set the Process Stack Pointer
**
** @param  uint32_t Process Stack Pointer
** @return none
**
** Assign the value ProcessStackPointer to the MSP 
** (process stack pointer) Cortex processor register
*********************************************************************************************************/
void __set_PSP(uint32_t topOfProcStack)
{
    __ASM("msr psp, r0");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  Return the Main Stack Pointer
**
** @param  none
** @return uint32_t Main Stack Pointer
**
** Return the current value of the MSP (main stack pointer)
** Cortex processor register
*********************************************************************************************************/
uint32_t __get_MSP(void)
{
    __ASM("mrs r0, msp");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  Set the Main Stack Pointer
**
** @param  uint32_t Main Stack Pointer
** @return none
**
** Assign the value mainStackPointer to the MSP 
** (main stack pointer) Cortex processor register
*********************************************************************************************************/
void __set_MSP(uint32_t topOfMainStack)
{
    __ASM("msr msp, r0");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  Reverse byte order in unsigned short value
**
** @param  uint16_t value to reverse
** @return uint32_t reversed value
**
** Reverse byte order in unsigned short value
*********************************************************************************************************/
uint32_t __REV16(uint16_t value)
{
    __ASM("rev16 r0, r0");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  Reverse bit order of value
**
** @param  uint32_t value to reverse
** @return uint32_t reversed value
**
** Reverse bit order of value
*********************************************************************************************************/
uint32_t __RBIT(uint32_t value)
{
    __ASM("rbit r0, r0");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  LDR Exclusive
**
** @param  uint8_t* address
** @return uint8_t value of (*address)
**
** Exclusive LDR command
*********************************************************************************************************/
uint8_t __LDREXB(uint8_t *addr)
{
    __ASM("ldrexb r0, [r0]");
    __ASM("bx lr"); 
}

/*********************************************************************************************************
** @brief  LDR Exclusive
**
** @param  uint16_t* address
** @return uint16_t value of (*address)
**
** Exclusive LDR command
*********************************************************************************************************/
uint16_t __LDREXH(uint16_t *addr)
{
    __ASM("ldrexh r0, [r0]");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  LDR Exclusive
**
** @param  uint32_t* address
** @return uint32_t value of (*address)
**
** Exclusive LDR command
*********************************************************************************************************/
uint32_t __LDREXW(uint32_t *addr)
{
    __ASM("ldrex r0, [r0]");
    __ASM("bx lr");
}

/*********************************************************************************************************
** @brief  STR Exclusive
**
** @param  uint8_t* address
** @param  uint8_t value to store
** @return uint32_t successful / failed
**
** Exclusive STR command
*********************************************************************************************************/
uint32_t __STREXB(uint8_t value, uint8_t *addr)
{
    __ASM("strexb r0, r0, [r1]");