321 lines
12 KiB
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321 lines
12 KiB
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<title>CMSIS Changes</title>
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</head>
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<body>
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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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{
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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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