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-<html>
-
-<head>
-<title>CMSIS Changes</title>
-<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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-
-<h1>Changes to CMSIS version V1.20</h1>
-
-<hr>
-
-<h2>1. Removed CMSIS Middelware packages</h2>
-<p>
- CMSIS Middleware is on hold from ARM side until a agreement between all CMSIS partners is found.
-</p>
-
-<h2>2. SystemFrequency renamed to SystemCoreClock</h2>
-<p>
- The variable name <strong>SystemCoreClock</strong> is more precise than <strong>SystemFrequency</strong>
- because the variable holds the clock value at which the core is running.
-</p>
-
-<h2>3. Changed startup concept</h2>
-<p>
- The old startup concept (calling SystemInit_ExtMemCtl from startup file and calling SystemInit
- from main) has the weakness that it does not work for controllers which need a already
- configuerd clock system to configure the external memory controller.
-</p>
-
-<h3>Changed startup concept</h3>
-<ul>
- <li>
- SystemInit() is called from startup file before <strong>premain</strong>.
- </li>
- <li>
- <strong>SystemInit()</strong> configures the clock system and also configures
- an existing external memory controller.
- </li>
- <li>
- <strong>SystemInit()</strong> must not use global variables.
- </li>
- <li>
- <strong>SystemCoreClock</strong> is initialized with a correct predefined value.
- </li>
- <li>
- Additional function <strong>void SystemCoreClockUpdate (void)</strong> is provided.<br>
- <strong>SystemCoreClockUpdate()</strong> updates the variable <strong>SystemCoreClock</strong>
- and must be called whenever the core clock is changed.<br>
- <strong>SystemCoreClockUpdate()</strong> evaluates the clock register settings and calculates
- the current core clock.
- </li>
-</ul>
-
-
-<h2>4. Advanced Debug Functions</h2>
-<p>
- ITM communication channel is only capable for OUT direction. To allow also communication for
- IN direction a simple concept is provided.
-</p>
-<ul>
- <li>
- Global variable <strong>volatile int ITM_RxBuffer</strong> used for IN data.
- </li>
- <li>
- Function <strong>int ITM_CheckChar (void)</strong> checks if a new character is available.
- </li>
- <li>
- Function <strong>int ITM_ReceiveChar (void)</strong> retrieves the new character.
- </li>
-</ul>
-
-<p>
- For detailed explanation see file <strong>CMSIS debug support.htm</strong>.
-</p>
-
-
-<h2>5. Core Register Bit Definitions</h2>
-<p>
- Files core_cm3.h and core_cm0.h contain now bit definitions for Core Registers. The name for the
- defines correspond with the Cortex-M Technical Reference Manual.
-</p>
-<p>
- e.g. SysTick structure with bit definitions
-</p>
-<pre>
-/** @addtogroup CMSIS_CM3_SysTick CMSIS CM3 SysTick
- memory mapped structure for SysTick
- @{
- */
-typedef struct
-{
- __IO uint32_t CTRL; /*!< Offset: 0x00 SysTick Control and Status Register */
- __IO uint32_t LOAD; /*!< Offset: 0x04 SysTick Reload Value Register */
- __IO uint32_t VAL; /*!< Offset: 0x08 SysTick Current Value Register */
- __I uint32_t CALIB; /*!< Offset: 0x0C SysTick Calibration Register */
-} SysTick_Type;
-
-/* SysTick Control / Status Register Definitions */
-#define SysTick_CTRL_COUNTFLAG_Pos 16 /*!< SysTick CTRL: COUNTFLAG Position */
-#define SysTick_CTRL_COUNTFLAG_Msk (1ul << SysTick_CTRL_COUNTFLAG_Pos) /*!< SysTick CTRL: COUNTFLAG Mask */
-
-#define SysTick_CTRL_CLKSOURCE_Pos 2 /*!< SysTick CTRL: CLKSOURCE Position */
-#define SysTick_CTRL_CLKSOURCE_Msk (1ul << SysTick_CTRL_CLKSOURCE_Pos) /*!< SysTick CTRL: CLKSOURCE Mask */
-
-#define SysTick_CTRL_TICKINT_Pos 1 /*!< SysTick CTRL: TICKINT Position */
-#define SysTick_CTRL_TICKINT_Msk (1ul << SysTick_CTRL_TICKINT_Pos) /*!< SysTick CTRL: TICKINT Mask */
-
-#define SysTick_CTRL_ENABLE_Pos 0 /*!< SysTick CTRL: ENABLE Position */
-#define SysTick_CTRL_ENABLE_Msk (1ul << SysTick_CTRL_ENABLE_Pos) /*!< SysTick CTRL: ENABLE Mask */
-
-/* SysTick Reload Register Definitions */
-#define SysTick_LOAD_RELOAD_Pos 0 /*!< SysTick LOAD: RELOAD Position */
-#define SysTick_LOAD_RELOAD_Msk (0xFFFFFFul << SysTick_LOAD_RELOAD_Pos) /*!< SysTick LOAD: RELOAD Mask */
-
-/* SysTick Current Register Definitions */
-#define SysTick_VAL_CURRENT_Pos 0 /*!< SysTick VAL: CURRENT Position */
-#define SysTick_VAL_CURRENT_Msk (0xFFFFFFul << SysTick_VAL_CURRENT_Pos) /*!< SysTick VAL: CURRENT Mask */
-
-/* SysTick Calibration Register Definitions */
-#define SysTick_CALIB_NOREF_Pos 31 /*!< SysTick CALIB: NOREF Position */
-#define SysTick_CALIB_NOREF_Msk (1ul << SysTick_CALIB_NOREF_Pos) /*!< SysTick CALIB: NOREF Mask */
-
-#define SysTick_CALIB_SKEW_Pos 30 /*!< SysTick CALIB: SKEW Position */
-#define SysTick_CALIB_SKEW_Msk (1ul << SysTick_CALIB_SKEW_Pos) /*!< SysTick CALIB: SKEW Mask */
-
-#define SysTick_CALIB_TENMS_Pos 0 /*!< SysTick CALIB: TENMS Position */
-#define SysTick_CALIB_TENMS_Msk (0xFFFFFFul << SysTick_VAL_CURRENT_Pos) /*!< SysTick CALIB: TENMS Mask */
-/*@}*/ /* end of group CMSIS_CM3_SysTick */</pre>
-
-<h2>7. DoxyGen Tags</h2>
-<p>
- DoxyGen tags in files core_cm3.[c,h] and core_cm0.[c,h] are reworked to create proper documentation
- using DoxyGen.
-</p>
-
-<h2>8. Folder Structure</h2>
-<p>
- The folder structure is changed to differentiate the single support packages.
-</p>
-
- <ul>
- <li>CM0</li>
- <li>CM3
- <ul>
- <li>CoreSupport</li>
- <li>DeviceSupport</li>
- <ul>
- <li>Vendor
- <ul>
- <li>Device
- <ul>
- <li>Startup
- <ul>
- <li>Toolchain</li>
- <li>Toolchain</li>
- <li>...</li>
- </ul>
- </li>
- </ul>
- </li>
- <li>Device</li>
- <li>...</li>
- </ul>
- </li>
- <li>Vendor</li>
- <li>...</li>
- </ul>
- </li>
- <li>Example
- <ul>
- <li>Toolchain
- <ul>
- <li>Device</li>
- <li>Device</li>
- <li>...</li>
- </ul>
- </li>
- <li>Toolchain</li>
- <li>...</li>
- </ul>
- </li>
- </ul>
- </li>
-
- <li>Documentation</li>
- </ul>
-
-<h2>9. Open Points</h2>
-<p>
- Following points need to be clarified and solved:
-</p>
-<ul>
- <li>
- <p>
- Equivalent C and Assembler startup files.
- </p>
- <p>
- Is there a need for having C startup files although assembler startup files are
- very efficient and do not need to be changed?
- <p/>
- </li>
- <li>
- <p>
- Placing of HEAP in external RAM.
- </p>
- <p>
- It must be possible to place HEAP in external RAM if the device supports an
- external memory controller.
- </p>
- </li>
- <li>
- <p>
- Placing of STACK /HEAP.
- </p>
- <p>
- STACK should always be placed at the end of internal RAM.
- </p>
- <p>
- If HEAP is placed in internal RAM than it should be placed after RW ZI section.
- </p>
- </li>
- <li>
- <p>
- Removing core_cm3.c and core_cm0.c.
- </p>
- <p>
- On a long term the functions in core_cm3.c and core_cm0.c must be replaced with
- appropriate compiler intrinsics.
- </p>
- </li>
-</ul>
-
-
-<h2>10. Limitations</h2>
-<p>
- The following limitations are not covered with the current CMSIS version:
-</p>
-<ul>
- <li>
- No <strong>C startup files</strong> for ARM toolchain are provided.
- </li>
- <li>
- No <strong>C startup files</strong> for GNU toolchain are provided.
- </li>
- <li>
- No <strong>C startup files</strong> for IAR toolchain are provided.
- </li>
- <li>
- No <strong>Tasking</strong> projects are provided yet.
- </li>
-</ul>