/Target/Demo/ARMCM3_STM32F103_DiWheelDrive_GCC/Boot/lib/CMSIS/CMSIS_changes.htm - Annotate - AMiRo-OS - Research for Cognitive Interaction

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Thomas Schöpping

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<h1>Changes to CMSIS version V1.20</h1>

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<hr>

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<h2>1. Removed CMSIS Middelware packages</h2>

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<p>

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  CMSIS Middleware is on hold from ARM side until a agreement between all CMSIS partners is found.

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</p>

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<h2>2. SystemFrequency renamed to SystemCoreClock</h2>

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<p>

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  The variable name <strong>SystemCoreClock</strong> is more precise than <strong>SystemFrequency</strong>

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  because the variable holds the clock value at which the core is running.

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</p>

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<h2>3. Changed startup concept</h2>

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<p>

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  The old startup concept (calling SystemInit_ExtMemCtl from startup file and calling SystemInit

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  from main) has the weakness that it does not work for controllers which need a already

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  configuerd clock system to configure the external memory controller.

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</p>

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<h3>Changed startup concept</h3>

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<ul>

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  <li>

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    SystemInit() is called from startup file before <strong>premain</strong>.

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  </li>

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  <li>

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    <strong>SystemInit()</strong> configures the clock system and also configures

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    an existing external memory controller.

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  </li>

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  <li>

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    <strong>SystemInit()</strong> must not use global variables.

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  </li>

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  <li>

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    <strong>SystemCoreClock</strong> is initialized with a correct predefined value.

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  </li>

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  <li>

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    Additional function <strong>void SystemCoreClockUpdate (void)</strong> is provided.<br>

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   <strong>SystemCoreClockUpdate()</strong> updates the variable <strong>SystemCoreClock</strong>

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   and must be called whenever the core clock is changed.<br>

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   <strong>SystemCoreClockUpdate()</strong> evaluates the clock register settings and calculates

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   the current core clock.

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  </li>

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</ul>

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<h2>4. Advanced Debug Functions</h2>

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<p>

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  ITM communication channel is only capable for OUT direction. To allow also communication for

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  IN direction a simple concept is provided.

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</p>

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<ul>

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  <li>

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    Global variable <strong>volatile int ITM_RxBuffer</strong> used for IN data.

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  </li>

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  <li>

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    Function <strong>int ITM_CheckChar (void)</strong> checks if a new character is available.

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  </li>

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  <li>

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    Function <strong>int ITM_ReceiveChar (void)</strong> retrieves the new character.

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  </li>

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</ul>

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<p>

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  For detailed explanation see file <strong>CMSIS debug support.htm</strong>.

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</p>

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<h2>5. Core Register Bit Definitions</h2>

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<p>

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  Files core_cm3.h and core_cm0.h contain now bit definitions for Core Registers. The name for the

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  defines correspond with the Cortex-M Technical Reference Manual.

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</p>

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<p>

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  e.g. SysTick structure with bit definitions

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</p>

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<pre>

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/** @addtogroup CMSIS_CM3_SysTick CMSIS CM3 SysTick

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  memory mapped structure for SysTick

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@{

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*/

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typedef struct

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  __IO uint32_t CTRL;                         /*!< Offset: 0x00  SysTick Control and Status Register */

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  __IO uint32_t LOAD;                         /*!< Offset: 0x04  SysTick Reload Value Register       */

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  __IO uint32_t VAL;                          /*!< Offset: 0x08  SysTick Current Value Register      */

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  __I  uint32_t CALIB;                        /*!< Offset: 0x0C  SysTick Calibration Register        */

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} SysTick_Type;

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/* SysTick Control / Status Register Definitions */

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#define SysTick_CTRL_COUNTFLAG_Pos         16                                             /*!< SysTick CTRL: COUNTFLAG Position */

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#define SysTick_CTRL_COUNTFLAG_Msk         (1ul << SysTick_CTRL_COUNTFLAG_Pos)            /*!< SysTick CTRL: COUNTFLAG Mask */

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#define SysTick_CTRL_CLKSOURCE_Pos          2                                             /*!< SysTick CTRL: CLKSOURCE Position */

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#define SysTick_CTRL_CLKSOURCE_Msk         (1ul << SysTick_CTRL_CLKSOURCE_Pos)            /*!< SysTick CTRL: CLKSOURCE Mask */

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#define SysTick_CTRL_TICKINT_Pos            1                                             /*!< SysTick CTRL: TICKINT Position */

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#define SysTick_CTRL_TICKINT_Msk           (1ul << SysTick_CTRL_TICKINT_Pos)              /*!< SysTick CTRL: TICKINT Mask */

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#define SysTick_CTRL_ENABLE_Pos             0                                             /*!< SysTick CTRL: ENABLE Position */

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#define SysTick_CTRL_ENABLE_Msk            (1ul << SysTick_CTRL_ENABLE_Pos)               /*!< SysTick CTRL: ENABLE Mask */

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/* SysTick Reload Register Definitions */

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#define SysTick_LOAD_RELOAD_Pos             0                                             /*!< SysTick LOAD: RELOAD Position */

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#define SysTick_LOAD_RELOAD_Msk            (0xFFFFFFul << SysTick_LOAD_RELOAD_Pos)        /*!< SysTick LOAD: RELOAD Mask */

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/* SysTick Current Register Definitions */

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#define SysTick_VAL_CURRENT_Pos             0                                             /*!< SysTick VAL: CURRENT Position */

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#define SysTick_VAL_CURRENT_Msk            (0xFFFFFFul << SysTick_VAL_CURRENT_Pos)        /*!< SysTick VAL: CURRENT Mask */

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/* SysTick Calibration Register Definitions */

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#define SysTick_CALIB_NOREF_Pos            31                                             /*!< SysTick CALIB: NOREF Position */

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#define SysTick_CALIB_NOREF_Msk            (1ul << SysTick_CALIB_NOREF_Pos)               /*!< SysTick CALIB: NOREF Mask */

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#define SysTick_CALIB_SKEW_Pos             30                                             /*!< SysTick CALIB: SKEW Position */

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#define SysTick_CALIB_SKEW_Msk             (1ul << SysTick_CALIB_SKEW_Pos)                /*!< SysTick CALIB: SKEW Mask */

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#define SysTick_CALIB_TENMS_Pos             0                                             /*!< SysTick CALIB: TENMS Position */

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#define SysTick_CALIB_TENMS_Msk            (0xFFFFFFul << SysTick_VAL_CURRENT_Pos)        /*!< SysTick CALIB: TENMS Mask */

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/*@}*/ /* end of group CMSIS_CM3_SysTick */</pre>

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<h2>7. DoxyGen Tags</h2>

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<p>

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  DoxyGen tags in files core_cm3.[c,h] and core_cm0.[c,h] are reworked to create proper documentation

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  using DoxyGen.

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</p>

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<h2>8. Folder Structure</h2>

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<p>

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  The folder structure is changed to differentiate the single support packages.

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</p>

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  <ul>

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    <li>CM0</li>

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    <li>CM3

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       <ul>

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         <li>CoreSupport</li>

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         <li>DeviceSupport</li>

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           <ul>

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             <li>Vendor

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               <ul>

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                 <li>Device

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                   <ul>

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                      <li>Startup

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                        <ul>

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                          <li>Toolchain</li>

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                          <li>Toolchain</li>

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                          <li>...</li>

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                        </ul>

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                      </li>

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                   </ul>

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                 </li>

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                 <li>Device</li>

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                 <li>...</li>

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               </ul>

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             </li>

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             <li>Vendor</li>

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             <li>...</li>

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           </ul>

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         </li>

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         <li>Example

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           <ul>

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             <li>Toolchain

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               <ul>

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                 <li>Device</li>

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                 <li>Device</li>

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                 <li>...</li>

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               </ul>

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             </li>

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             <li>Toolchain</li>

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             <li>...</li>

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           </ul>

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         </li>

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       </ul>

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    </li>

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    <li>Documentation</li>

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  </ul>

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<h2>9. Open Points</h2>

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<p>

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  Following points need to be clarified and solved:

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</p>

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<ul>

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  <li>

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<p>

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      Equivalent C and Assembler startup files.

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    </p>

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<p>

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      Is there a need for having C startup files although assembler startup files are

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      very efficient and do not need to be changed?

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    <p/>

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  </li>

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  <li>

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<p>

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      Placing of HEAP in external RAM.

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    </p>

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<p>

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      It must be possible to place HEAP in external RAM if the device supports an

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      external memory controller.

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    </p>

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  </li>

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  <li>

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<p>

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      Placing of STACK /HEAP.

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    </p>

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<p>

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      STACK should always be placed at the end of internal RAM.

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    </p>

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<p>

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      If HEAP is placed in internal RAM than it should be placed after RW ZI section.

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    </p>

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  </li>

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  <li>

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<p>

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      Removing core_cm3.c and core_cm0.c.

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    </p>

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<p>

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      On a long term the functions in core_cm3.c and core_cm0.c must be replaced with

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      appropriate compiler intrinsics.

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    </p>

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  </li>

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</ul>

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<h2>10. Limitations</h2>

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<p>

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  The following limitations are not covered with the current CMSIS version:

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</p>

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<ul>

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 <li>

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  No <strong>C startup files</strong> for ARM toolchain are provided.

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 </li>

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 <li>

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  No <strong>C startup files</strong> for GNU toolchain are provided.

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 </li>

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 <li>

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  No <strong>C startup files</strong> for IAR toolchain are provided.

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 </li>

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 <li>

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  No <strong>Tasking</strong> projects are provided yet.

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 </li>

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</ul>

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