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Arduino/hardware/sam/system/CMSIS/Documentation/CMSIS_History.htm

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<html>
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<title>CMSIS Version History</title>
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<h1>CMSIS Version History</h1>
<p align="center">This document describes the changes between the different CMSIS versions.</p>
<p align="center">Version: 2.00 - December 2010</p>
<p class="TinyT">Information in this file, the accompany manuals, and software is<br>
Copyright <20> ARM Ltd.<br>All rights reserved.
</p>
<hr>
<h2>Contents</h2>
<ol>
<li class="LI2"><a href="#6">Used Toolchains</a></li>
<li class="LI2"><a href="#5">Changes to version V1.30</a></li>
<li class="LI2"><a href="#4">Changes to version V1.20</a></li>
<li class="LI2"><a href="#2">Open Points</a></li>
<li class="LI2"><a href="#1">Limitations</a></li>
</ol>
<h2><a name="5"></a>Used Toolchains</h2>
<p>
Following toolchains have been used for test / verification:</i>.
</p>
<ul>
<li>ARM: MDK-ARM Version 4.13a</li>
<li>GNU: Sourcery G++ Lite Edition for ARM 2010.09-51</li>
<li>IAR: IAR Embedded Workbench Kickstart Edition V6.10</li>
</ul>
<h2><a name="5"></a>Changes to version V1.30</h2>
<h3>Added CMSIS DSP Software Library</h3>
<p>
The <strong>CMSIS DSP Software Library</strong> is a suite of common signal processing functions targeted
to Cortex-M processor based microcontrollers. Even though the code has been specifically
optimized towards using the extended DSP instruction set of the Cortex-M4 processor,
the library can be compiled for any Cortex-M processor.
</p>
<p>
For more information see <i>CMSIS DSP Library documentation</i>.
</p>
<h3>Added CMSIS System View Description</h3>
<p>
The <strong>CMSIS System View Description</strong> answers the challenges of accurate, detailed and
timely device aware peripheral debugging support for Cortex Microcontroller based
devices by the software development tools vendor community.
</p>
<p>
Silicon vendors shall create and maintain a formalized description of the debug view
for all the peripherals contained in their Cortex Microcontroller based devices.
Tool vendors use such descriptions to establish device specific debug support in
their debugging tools.
</p>
<p>
A standardized System View Description shall provide a common approach to
capturing peripheral debug related information in a machine readable files.
</p>
<p>
For more information see <i>CMSIS System View Description</i>.
</p>
<h3>Added Cortex-M4 Core Support</h3>
<p>
Additional folder <strong>CM4</strong>, containing the Cortex-M4 core support files, has been added.
</p>
<ul>
<li>CM0</li>
<li>CM3</li>
<li>CM4
<ul>
<li>CoreSupport</li>
<li>DeviceSupport</li>
</ul>
</li>
</ul>
<h3>New naming for Core Support Files</h3>
<p>
The new Core Support Files are:
</p>
<ul>
<li>core_cm#.h (# = 0, 3, 4)</li>
<li>core_cmFunc.h (Cortex-M Core Register access functions)</li>
<li>core_cmInstr.h (Cortex-M Core instructions)</li>
<li>core_cm4_simd.h (Cortex-M4 SIMD instructions)</li>
</ul>
<h2><a name="4"></a>Changes to version V1.20</h2>
<h3>Removed CMSIS Middelware packages</h3>
<p>
CMSIS Middleware is removed and no longer focus of CMSIS.
</p>
<h3>SystemFrequency renamed to SystemCoreClock</h3>
<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>
<h3>Changed startup concept</h3>
<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>
<h5>Changed startup concept</h5>
<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>
<h3>Advanced Debug Functions</h3>
<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>
<h3>Core Register Bit Definitions</h3>
<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>
<h3>DoxyGen Tags</h3>
<p>
DoxyGen tags in files core_cm3.[c,h] and core_cm0.[c,h] are reworked to create proper documentation
using DoxyGen.
</p>
<h3>Folder Structure</h3>
<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 <i>(optional)</i>
<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><a name="2"></a>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><a name="1"></a>Limitations</h2>
<p>
The following limitations are not covered with the current CMSIS version:
</p>
<ul>
<li>
No <strong>C startup files</strong> available yet.
</li>
</ul>
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