Statistics
| Branch: | Tag: | Revision:

amiro-blt / Target / Modules / DiWheelDrive_1-1 / Boot / lib / CMSIS / CMSIS_changes.htm @ 367c0652

History | View | Annotate | Download (12.2 KB)

1 69661903 Thomas Schöpping
<html>
2
3
<head>
4
<title>CMSIS Changes</title>
5
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
6
<meta name="GENERATOR" content="Microsoft FrontPage 6.0">
7
<meta name="ProgId" content="FrontPage.Editor.Document">
8
<style>
9
<!--
10
/*-----------------------------------------------------------
11
Keil Software CHM Style Sheet
12
-----------------------------------------------------------*/
13
body         { color: #000000; background-color: #FFFFFF; font-size: 75%; font-family: 
14
               Verdana, Arial, 'Sans Serif' }
15
a:link       { color: #0000FF; text-decoration: underline }
16
a:visited    { color: #0000FF; text-decoration: underline }
17
a:active     { color: #FF0000; text-decoration: underline }
18
a:hover      { color: #FF0000; text-decoration: underline }
19
h1           { font-family: Verdana; font-size: 18pt; color: #000080; font-weight: bold; 
20
               text-align: Center; margin-right: 3 }
21
h2           { font-family: Verdana; font-size: 14pt; color: #000080; font-weight: bold; 
22
               background-color: #CCCCCC; margin-top: 24; margin-bottom: 3; 
23
               padding: 6 }
24
h3           { font-family: Verdana; font-size: 10pt; font-weight: bold; background-color: 
25
               #CCCCCC; margin-top: 24; margin-bottom: 3; padding: 6 }
26
pre          { font-family: Courier New; font-size: 10pt; background-color: #CCFFCC; 
27
               margin-left: 24; margin-right: 24 }
28
ul           { list-style-type: square; margin-top: 6pt; margin-bottom: 0 }
29
ol           { margin-top: 6pt; margin-bottom: 0 }
30
li           { clear: both; margin-bottom: 6pt }
31
table        { font-size: 100%; border-width: 0; padding: 0 }
32
th           { color: #FFFFFF; background-color: #000080; text-align: left; vertical-align: 
33
               bottom; padding-right: 6pt }
34
tr           { text-align: left; vertical-align: top }
35
td           { text-align: left; vertical-align: top; padding-right: 6pt }
36
.ToolT       { font-size: 8pt; color: #808080 }
37
.TinyT       { font-size: 8pt; text-align: Center }
38
code         { color: #000000; background-color: #E0E0E0; font-family: 'Courier New', Courier; 
39
               line-height: 120%; font-style: normal }
40
/*-----------------------------------------------------------
41
Notes
42
-----------------------------------------------------------*/
43
p.note       { font-weight: bold; clear: both; margin-bottom: 3pt; padding-top: 6pt }
44
/*-----------------------------------------------------------
45
Expanding/Contracting Divisions
46
-----------------------------------------------------------*/
47
#expand      { text-decoration: none; margin-bottom: 3pt }
48
img.expand   { border-style: none; border-width: medium }
49
div.expand   { display: none; margin-left: 9pt; margin-top: 0 }
50
/*-----------------------------------------------------------
51
Where List Tags
52
-----------------------------------------------------------*/
53
p.wh         { font-weight: bold; clear: both; margin-top: 6pt; margin-bottom: 3pt }
54
table.wh     { width: 100% }
55
td.whItem    { white-space: nowrap; font-style: italic; padding-right: 6pt; padding-bottom: 
56
               6pt }
57
td.whDesc    { padding-bottom: 6pt }
58
/*-----------------------------------------------------------
59
Keil Table Tags
60
-----------------------------------------------------------*/
61
table.kt     { border: 1pt solid #000000 }
62
th.kt        { white-space: nowrap; border-bottom: 1pt solid #000000; padding-left: 6pt; 
63
               padding-right: 6pt; padding-top: 4pt; padding-bottom: 4pt }
64
tr.kt        {  }
65
td.kt        { color: #000000; background-color: #E0E0E0; border-top: 1pt solid #A0A0A0; 
66
               padding-left: 6pt; padding-right: 6pt; padding-top: 2pt; 
67
               padding-bottom: 2pt }
68
/*-----------------------------------------------------------
69
-----------------------------------------------------------*/
70
-->
71
72
</style>
73
</head>
74
75
<body>
76
77
<h1>Changes to CMSIS version V1.20</h1>
78
79
<hr>
80
81
<h2>1. Removed CMSIS Middelware packages</h2>
82
<p>
83
  CMSIS Middleware is on hold from ARM side until a agreement between all CMSIS partners is found.
84
</p>
85
86
<h2>2. SystemFrequency renamed to SystemCoreClock</h2>
87
<p>
88
  The variable name <strong>SystemCoreClock</strong> is more precise than <strong>SystemFrequency</strong>
89
  because the variable holds the clock value at which the core is running.
90
</p>
91
92
<h2>3. Changed startup concept</h2>
93
<p>
94
  The old startup concept (calling SystemInit_ExtMemCtl from startup file and calling SystemInit 
95
  from main) has the weakness that it does not work for controllers which need a already 
96
  configuerd clock system to configure the external memory controller.
97
</p>
98
99
<h3>Changed startup concept</h3>
100
<ul>
101
  <li>
102
    SystemInit() is called from startup file before <strong>premain</strong>.
103
  </li>
104
  <li>
105
    <strong>SystemInit()</strong> configures the clock system and also configures
106
    an existing external memory controller.
107
  </li>
108
  <li>
109
    <strong>SystemInit()</strong> must not use global variables.
110
  </li>
111
  <li>
112
    <strong>SystemCoreClock</strong> is initialized with a correct predefined value.
113
  </li>
114
  <li>
115
    Additional function <strong>void SystemCoreClockUpdate (void)</strong> is provided.<br>
116
   <strong>SystemCoreClockUpdate()</strong> updates the variable <strong>SystemCoreClock</strong>
117
   and must be called whenever the core clock is changed.<br>
118
   <strong>SystemCoreClockUpdate()</strong> evaluates the clock register settings and calculates
119
   the current core clock.
120
  </li>
121
</ul>
122
      
123
124
<h2>4. Advanced Debug Functions</h2>
125
<p>
126
  ITM communication channel is only capable for OUT direction. To allow also communication for
127
  IN direction a simple concept is provided.
128
</p>
129
<ul>
130
  <li>
131
    Global variable <strong>volatile int ITM_RxBuffer</strong> used for IN data.
132
  </li>
133
  <li>
134
    Function <strong>int ITM_CheckChar (void)</strong> checks if a new character is available.
135
  </li>
136
  <li>
137
    Function <strong>int ITM_ReceiveChar (void)</strong> retrieves the new character.
138
  </li>
139
</ul>
140
141
<p>
142
  For detailed explanation see file <strong>CMSIS debug support.htm</strong>. 
143
</p>
144
145
146
<h2>5. Core Register Bit Definitions</h2>
147
<p>
148
  Files core_cm3.h and core_cm0.h contain now bit definitions for Core Registers. The name for the
149
  defines correspond with the Cortex-M Technical Reference Manual.  
150
</p>
151
<p>
152
  e.g. SysTick structure with bit definitions
153
</p>
154
<pre>
155
/** @addtogroup CMSIS_CM3_SysTick CMSIS CM3 SysTick
156
  memory mapped structure for SysTick
157
  @{
158
 */
159
typedef struct
160
{
161
  __IO uint32_t CTRL;                         /*!< Offset: 0x00  SysTick Control and Status Register */
162
  __IO uint32_t LOAD;                         /*!< Offset: 0x04  SysTick Reload Value Register       */
163
  __IO uint32_t VAL;                          /*!< Offset: 0x08  SysTick Current Value Register      */
164
  __I  uint32_t CALIB;                        /*!< Offset: 0x0C  SysTick Calibration Register        */
165
} SysTick_Type;
166
167
/* SysTick Control / Status Register Definitions */
168
#define SysTick_CTRL_COUNTFLAG_Pos         16                                             /*!< SysTick CTRL: COUNTFLAG Position */
169
#define SysTick_CTRL_COUNTFLAG_Msk         (1ul << SysTick_CTRL_COUNTFLAG_Pos)            /*!< SysTick CTRL: COUNTFLAG Mask */
170
171
#define SysTick_CTRL_CLKSOURCE_Pos          2                                             /*!< SysTick CTRL: CLKSOURCE Position */
172
#define SysTick_CTRL_CLKSOURCE_Msk         (1ul << SysTick_CTRL_CLKSOURCE_Pos)            /*!< SysTick CTRL: CLKSOURCE Mask */
173
174
#define SysTick_CTRL_TICKINT_Pos            1                                             /*!< SysTick CTRL: TICKINT Position */
175
#define SysTick_CTRL_TICKINT_Msk           (1ul << SysTick_CTRL_TICKINT_Pos)              /*!< SysTick CTRL: TICKINT Mask */
176
177
#define SysTick_CTRL_ENABLE_Pos             0                                             /*!< SysTick CTRL: ENABLE Position */
178
#define SysTick_CTRL_ENABLE_Msk            (1ul << SysTick_CTRL_ENABLE_Pos)               /*!< SysTick CTRL: ENABLE Mask */
179
180
/* SysTick Reload Register Definitions */
181
#define SysTick_LOAD_RELOAD_Pos             0                                             /*!< SysTick LOAD: RELOAD Position */
182
#define SysTick_LOAD_RELOAD_Msk            (0xFFFFFFul << SysTick_LOAD_RELOAD_Pos)        /*!< SysTick LOAD: RELOAD Mask */
183
184
/* SysTick Current Register Definitions */
185
#define SysTick_VAL_CURRENT_Pos             0                                             /*!< SysTick VAL: CURRENT Position */
186
#define SysTick_VAL_CURRENT_Msk            (0xFFFFFFul << SysTick_VAL_CURRENT_Pos)        /*!< SysTick VAL: CURRENT Mask */
187
188
/* SysTick Calibration Register Definitions */
189
#define SysTick_CALIB_NOREF_Pos            31                                             /*!< SysTick CALIB: NOREF Position */
190
#define SysTick_CALIB_NOREF_Msk            (1ul << SysTick_CALIB_NOREF_Pos)               /*!< SysTick CALIB: NOREF Mask */
191
192
#define SysTick_CALIB_SKEW_Pos             30                                             /*!< SysTick CALIB: SKEW Position */
193
#define SysTick_CALIB_SKEW_Msk             (1ul << SysTick_CALIB_SKEW_Pos)                /*!< SysTick CALIB: SKEW Mask */
194
195
#define SysTick_CALIB_TENMS_Pos             0                                             /*!< SysTick CALIB: TENMS Position */
196
#define SysTick_CALIB_TENMS_Msk            (0xFFFFFFul << SysTick_VAL_CURRENT_Pos)        /*!< SysTick CALIB: TENMS Mask */
197
/*@}*/ /* end of group CMSIS_CM3_SysTick */</pre>
198
199
<h2>7. DoxyGen Tags</h2>
200
<p>
201
  DoxyGen tags in files core_cm3.[c,h] and core_cm0.[c,h] are reworked to create proper documentation
202
  using DoxyGen.
203
</p>
204
205
<h2>8. Folder Structure</h2>
206
<p>
207
  The folder structure is changed to differentiate the single support packages.
208
</p>
209
210
  <ul>
211
    <li>CM0</li>
212
    <li>CM3
213
       <ul>
214
         <li>CoreSupport</li>
215
         <li>DeviceSupport</li>
216
           <ul>
217
             <li>Vendor 
218
               <ul>
219
                 <li>Device
220
                   <ul>
221
                      <li>Startup
222
                        <ul>
223
                          <li>Toolchain</li>
224
                          <li>Toolchain</li>
225
                          <li>...</li>
226
                        </ul>
227
                      </li>
228
                   </ul>
229
                 </li>
230
                 <li>Device</li>
231
                 <li>...</li>
232
               </ul>
233
             </li>
234
             <li>Vendor</li>
235
             <li>...</li>
236
           </ul>
237
         </li>
238
         <li>Example
239
           <ul>
240
             <li>Toolchain 
241
               <ul>
242
                 <li>Device</li>
243
                 <li>Device</li>
244
                 <li>...</li>
245
               </ul>
246
             </li>
247
             <li>Toolchain</li>
248
             <li>...</li>
249
           </ul>
250
         </li>
251
       </ul>
252
    </li>
253
     
254
    <li>Documentation</li>
255
  </ul>
256
257
<h2>9. Open Points</h2>
258
<p>
259
  Following points need to be clarified and solved:
260
</p>
261
<ul>
262
  <li>
263
    <p>
264
      Equivalent C and Assembler startup files.
265
    </p>
266
    <p>
267
      Is there a need for having C startup files although assembler startup files are
268
      very efficient and do not need to be changed?
269
    <p/>
270
  </li>
271
  <li>
272
    <p>
273
      Placing of HEAP in external RAM.
274
    </p>
275
    <p>
276
      It must be possible to place HEAP in external RAM if the device supports an 
277
      external memory controller.
278
    </p>
279
  </li>
280
  <li>
281
    <p>
282
      Placing of STACK /HEAP.
283
    </p>
284
    <p>
285
      STACK should always be placed at the end of internal RAM.
286
    </p>
287
    <p>
288
      If HEAP is placed in internal RAM than it should be placed after RW ZI section.
289
    </p>
290
  </li>
291
  <li>
292
    <p>
293
      Removing core_cm3.c and core_cm0.c.
294
    </p>
295
    <p>
296
      On a long term the functions in core_cm3.c and core_cm0.c must be replaced with 
297
      appropriate compiler intrinsics.
298
    </p>
299
  </li>
300
</ul>
301
302
303
<h2>10. Limitations</h2>
304
<p>
305
  The following limitations are not covered with the current CMSIS version:
306
</p>
307
<ul>
308
 <li>
309
  No <strong>C startup files</strong> for ARM toolchain are provided. 
310
 </li>
311
 <li>
312
  No <strong>C startup files</strong> for GNU toolchain are provided. 
313
 </li>
314
 <li>
315
  No <strong>C startup files</strong> for IAR toolchain are provided. 
316
 </li>
317
 <li>
318
  No <strong>Tasking</strong> projects are provided yet. 
319
 </li>
320
</ul>