core_cm0.c

00001 /**************************************************************************//**
00002  * @file     core_cm0.c
00003  * @brief    CMSIS Cortex-M0 Core Peripheral Access Layer Source File
00004  * @version  V2.00
00005  * @date     10. September 2010
00006  *
00007  * @note
00008  * Copyright (C) 2009-2010 ARM Limited. All rights reserved.
00009  *
00010  * @par
00011  * ARM Limited (ARM) is supplying this software for use with Cortex-M 
00012  * processor based microcontrollers.  This file can be freely distributed 
00013  * within development tools that are supporting such ARM based processors. 
00014  *
00015  * @par
00016  * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
00017  * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
00018  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
00019  * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
00020  * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
00021  *
00022  ******************************************************************************/
00023 
00024 #include <stdint.h>
00025 
00026 /* define compiler specific symbols */
00027 #if defined ( __CC_ARM   )
00028   #define __ASM            __asm                                      /*!< asm keyword for ARM Compiler          */
00029   #define __INLINE         __inline                                   /*!< inline keyword for ARM Compiler       */
00030 
00031 #elif defined ( __ICCARM__ )
00032   #define __ASM           __asm                                       /*!< asm keyword for IAR Compiler          */
00033   #define __INLINE        inline                                      /*!< inline keyword for IAR Compiler. Only avaiable in High optimization mode! */
00034 
00035 #elif defined   (  __GNUC__  )
00036   #define __ASM            __asm                                      /*!< asm keyword for GNU Compiler          */
00037   #define __INLINE         inline                                     /*!< inline keyword for GNU Compiler       */
00038 
00039 #elif defined   (  __TASKING__  )
00040   #define __ASM            __asm                                      /*!< asm keyword for TASKING Compiler      */
00041   #define __INLINE         inline                                     /*!< inline keyword for TASKING Compiler   */
00042 
00043 #endif
00044 
00045 
00046 /* ##########################  Core Instruction Access  ######################### */
00047 
00048 #if defined ( __CC_ARM   ) /*------------------ RealView Compiler ----------------*/
00049 
00050 /** \brief  Reverse byte order (16 bit)
00051 
00052     This function reverses the byte order in two unsigned short values.
00053 
00054     \param [in]    value  Value to reverse
00055     \return               Reversed value
00056  */
00057 #if (__ARMCC_VERSION < 400677)
00058 __ASM uint32_t __REV16(uint32_t value)
00059 {
00060   rev16 r0, r0
00061   bx lr
00062 }
00063 #endif /* __ARMCC_VERSION  */ 
00064 
00065 
00066 /** \brief  Reverse byte order in signed short value
00067 
00068     This function reverses the byte order in a signed short value with sign extension to integer.
00069 
00070     \param [in]    value  Value to reverse
00071     \return               Reversed value
00072  */
00073 #if (__ARMCC_VERSION < 400677)
00074 __ASM int32_t __REVSH(int32_t value)
00075 {
00076   revsh r0, r0
00077   bx lr
00078 }
00079 #endif /* __ARMCC_VERSION  */ 
00080 
00081 
00082 /** \brief  Remove the exclusive lock
00083 
00084     This function removes the exclusive lock which is created by LDREX.
00085 
00086  */
00087 #if (__ARMCC_VERSION < 400000)
00088 __ASM void __CLREX(void)
00089 {
00090   clrex
00091 }
00092 #endif /* __ARMCC_VERSION  */ 
00093 
00094 
00095 #elif (defined (__ICCARM__)) /*---------------- ICC Compiler ---------------------*/
00096 /* obsolete */
00097 #elif (defined (__GNUC__)) /*------------------ GNU Compiler ---------------------*/
00098 /* obsolete */
00099 #elif (defined (__TASKING__)) /*--------------- TASKING Compiler -----------------*/
00100 /* obsolete */
00101 #endif
00102 
00103 
00104 /* ###########################  Core Function Access  ########################### */
00105 
00106 #if defined ( __CC_ARM   ) /*------------------ RealView Compiler ----------------*/
00107 
00108 /** \brief  Get Control Register
00109 
00110     This function returns the content of the Control Register.
00111 
00112     \return               Control Register value
00113  */
00114 #if       (__ARMCC_VERSION <  400000)
00115 __ASM uint32_t __get_CONTROL(void)
00116 {
00117   mrs r0, control
00118   bx lr
00119 }
00120 #endif /*  __ARMCC_VERSION  */ 
00121 
00122 
00123 /** \brief  Set Control Register
00124 
00125     This function writes the given value to the Control Register.
00126 
00127     \param [in]    control  Control Register value to set
00128  */
00129 #if       (__ARMCC_VERSION <  400000)
00130 __ASM void __set_CONTROL(uint32_t control)
00131 {
00132   msr control, r0
00133   bx lr
00134 }
00135 #endif /*  __ARMCC_VERSION  */ 
00136 
00137 
00138 /** \brief  Get ISPR Register
00139 
00140     This function returns the content of the ISPR Register.
00141 
00142     \return               ISPR Register value
00143  */
00144 #if       (__ARMCC_VERSION <  400000)
00145 __ASM uint32_t __get_IPSR(void)
00146 {
00147   mrs r0, ipsr
00148   bx lr
00149 }
00150 #endif /*  __ARMCC_VERSION  */ 
00151 
00152 
00153 /** \brief  Get APSR Register
00154 
00155     This function returns the content of the APSR Register.
00156 
00157     \return               APSR Register value
00158  */
00159 #if       (__ARMCC_VERSION <  400000)
00160 __ASM uint32_t __get_APSR(void)
00161 {
00162   mrs r0, apsr
00163   bx lr
00164 }
00165 #endif /*  __ARMCC_VERSION  */ 
00166 
00167 
00168 /** \brief  Get xPSR Register
00169 
00170     This function returns the content of the xPSR Register.
00171 
00172     \return               xPSR Register value
00173  */
00174 #if       (__ARMCC_VERSION <  400000)
00175 __ASM uint32_t __get_xPSR(void)
00176 {
00177   mrs r0, xpsr
00178   bx lr
00179 }
00180 #endif /*  __ARMCC_VERSION  */ 
00181 
00182 
00183 /** \brief  Get Process Stack Pointer
00184 
00185     This function returns the current value of the Process Stack Pointer (PSP).
00186 
00187     \return               PSP Register value
00188  */
00189 #if       (__ARMCC_VERSION <  400000)
00190 __ASM uint32_t __get_PSP(void)
00191 {
00192   mrs r0, psp
00193   bx lr
00194 }
00195 #endif /*  __ARMCC_VERSION  */ 
00196 
00197 
00198 /** \brief  Set Process Stack Pointer
00199 
00200     This function assigns the given value to the Process Stack Pointer (PSP).
00201 
00202     \param [in]    topOfProcStack  Process Stack Pointer value to set
00203  */
00204 #if       (__ARMCC_VERSION <  400000)
00205 __ASM void __set_PSP(uint32_t topOfProcStack)
00206 {
00207   msr psp, r0
00208   bx lr
00209 }
00210 #endif /*  __ARMCC_VERSION  */ 
00211 
00212 
00213 /** \brief  Get Main Stack Pointer
00214 
00215     This function returns the current value of the Main Stack Pointer (MSP).
00216 
00217     \return               MSP Register value
00218  */
00219 #if       (__ARMCC_VERSION <  400000)
00220 __ASM uint32_t __get_MSP(void)
00221 {
00222   mrs r0, msp
00223   bx lr
00224 }
00225 #endif /*  __ARMCC_VERSION  */ 
00226 
00227 
00228 /** \brief  Set Main Stack Pointer
00229 
00230     This function assigns the given value to the Main Stack Pointer (MSP).
00231 
00232     \param [in]    topOfMainStack  Main Stack Pointer value to set
00233  */
00234 #if       (__ARMCC_VERSION <  400000)
00235 __ASM void __set_MSP(uint32_t mainStackPointer)
00236 {
00237   msr msp, r0
00238   bx lr
00239 }
00240 #endif /*  __ARMCC_VERSION  */ 
00241 
00242 
00243 /** \brief  Get Priority Mask
00244 
00245     This function returns the current state of the priority mask bit from the Priority Mask Register.
00246 
00247     \return               Priority Mask value
00248  */
00249 #if       (__ARMCC_VERSION <  400000)
00250 __ASM uint32_t __get_PRIMASK(void)
00251 {
00252   mrs r0, primask
00253   bx lr
00254 }
00255 #endif /*  __ARMCC_VERSION  */ 
00256 
00257 
00258 /** \brief  Set Priority Mask
00259 
00260     This function assigns the given value to the Priority Mask Register.
00261 
00262     \param [in]    priMask  Priority Mask
00263  */
00264 #if       (__ARMCC_VERSION <  400000)
00265 __ASM void __set_PRIMASK(uint32_t priMask)
00266 {
00267   msr primask, r0
00268   bx lr
00269 }
00270 #endif /*  __ARMCC_VERSION  */ 
00271  
00272 
00273 #elif (defined (__ICCARM__)) /*---------------- ICC Compiler ---------------------*/
00274 /* obsolete */
00275 #elif (defined (__GNUC__)) /*------------------ GNU Compiler ---------------------*/
00276 /* obsolete */
00277 #elif (defined (__TASKING__)) /*--------------- TASKING Compiler -----------------*/
00278 /* obsolete */
00279 #endif