Mercurial > ~darius > hgwebdir.cgi > stm32temp
diff libs/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/CMSIS/CMSIS_changes.htm @ 0:c59513fd84fb
Initial commit of STM32 test code.
| author | Daniel O'Connor <darius@dons.net.au> |
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| date | Mon, 03 Oct 2011 21:19:15 +1030 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libs/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/CMSIS/CMSIS_changes.htm Mon Oct 03 21:19:15 2011 +1030 @@ -0,0 +1,320 @@ +<html> + +<head> +<title>CMSIS Changes</title> +<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> +<meta name="GENERATOR" content="Microsoft FrontPage 6.0"> +<meta name="ProgId" content="FrontPage.Editor.Document"> +<style> +<!-- +/*----------------------------------------------------------- +Keil Software CHM Style Sheet +-----------------------------------------------------------*/ +body { color: #000000; background-color: #FFFFFF; font-size: 75%; font-family: + Verdana, Arial, 'Sans Serif' } +a:link { color: #0000FF; text-decoration: underline } +a:visited { color: #0000FF; text-decoration: underline } +a:active { color: #FF0000; text-decoration: underline } +a:hover { color: #FF0000; text-decoration: underline } +h1 { font-family: Verdana; font-size: 18pt; color: #000080; font-weight: bold; + text-align: Center; margin-right: 3 } +h2 { font-family: Verdana; font-size: 14pt; color: #000080; font-weight: bold; + background-color: #CCCCCC; margin-top: 24; margin-bottom: 3; + padding: 6 } +h3 { font-family: Verdana; font-size: 10pt; font-weight: bold; background-color: + #CCCCCC; margin-top: 24; margin-bottom: 3; padding: 6 } +pre { font-family: Courier New; font-size: 10pt; background-color: #CCFFCC; + margin-left: 24; margin-right: 24 } +ul { list-style-type: square; margin-top: 6pt; margin-bottom: 0 } +ol { margin-top: 6pt; margin-bottom: 0 } +li { clear: both; margin-bottom: 6pt } +table { font-size: 100%; border-width: 0; padding: 0 } +th { color: #FFFFFF; background-color: #000080; text-align: left; vertical-align: + bottom; padding-right: 6pt } +tr { text-align: left; vertical-align: top } +td { text-align: left; vertical-align: top; padding-right: 6pt } +.ToolT { font-size: 8pt; color: #808080 } +.TinyT { font-size: 8pt; text-align: Center } +code { color: #000000; background-color: #E0E0E0; font-family: 'Courier New', Courier; + line-height: 120%; font-style: normal } +/*----------------------------------------------------------- +Notes +-----------------------------------------------------------*/ +p.note { font-weight: bold; clear: both; margin-bottom: 3pt; padding-top: 6pt } +/*----------------------------------------------------------- +Expanding/Contracting Divisions +-----------------------------------------------------------*/ +#expand { text-decoration: none; margin-bottom: 3pt } +img.expand { border-style: none; border-width: medium } +div.expand { display: none; margin-left: 9pt; margin-top: 0 } +/*----------------------------------------------------------- +Where List Tags +-----------------------------------------------------------*/ +p.wh { font-weight: bold; clear: both; margin-top: 6pt; margin-bottom: 3pt } +table.wh { width: 100% } +td.whItem { white-space: nowrap; font-style: italic; padding-right: 6pt; padding-bottom: + 6pt } +td.whDesc { padding-bottom: 6pt } +/*----------------------------------------------------------- +Keil Table Tags +-----------------------------------------------------------*/ +table.kt { border: 1pt solid #000000 } +th.kt { white-space: nowrap; border-bottom: 1pt solid #000000; padding-left: 6pt; + padding-right: 6pt; padding-top: 4pt; padding-bottom: 4pt } +tr.kt { } +td.kt { color: #000000; background-color: #E0E0E0; border-top: 1pt solid #A0A0A0; + padding-left: 6pt; padding-right: 6pt; padding-top: 2pt; + padding-bottom: 2pt } +/*----------------------------------------------------------- +-----------------------------------------------------------*/ +--> + +</style> +</head> + +<body> + +<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>