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[cmsis] / CMSIS / DoxyGen / Core / src / Overview.txt
1 /** \mainpage Overview
2
3 CMSIS-Core (Cortex-M) implements the basic run-time system for a Cortex-M device and gives the user access to the processor core and the device peripherals.
4 In detail it defines:
5  - <b>Hardware Abstraction Layer (HAL)</b> for Cortex-M processor registers with standardized  definitions for the SysTick, NVIC, System Control Block registers, MPU registers, FPU registers, and core access functions.
6  - <b>System exception names</b> to interface to system exceptions without having compatibility issues.
7  - <b>Methods to organize header files</b> that makes it easy to learn new Cortex-M microcontroller products and improve software portability. This includes naming conventions for device-specific interrupts.
8  - <b>Methods for system initialization</b> to be used by each MCU vendor. For example, the standardized SystemInit() function is essential for configuring the clock system of the device.
9  - <b>Intrinsic functions</b> used to generate CPU instructions that are not supported by standard C functions.
10  - A variable to determine the <b>system clock frequency</b> which simplifies the setup the SysTick timer.
11
12
13 The following sections provide details about the CMSIS-Core (Cortex-M):
14  - \ref using_pg describes the project setup and shows a simple program example.
15 \if ARMv8M
16  - \ref using_TrustZone_pg "Using TrustZone&reg; for Armv8-M" describes how to use the security extensions available in the Armv8-M architecture.
17 \endif
18  - \ref templates_pg describes the files of the CMSIS-Core (Cortex-M) in detail and explains how to adapt template files provided by Arm to silicon vendor devices.
19  - \ref coreMISRA_Exceptions_pg describes the violations to the MISRA standard.
20  - <a href="modules.html">\b Reference </a> describe the features and functions of the \ref device_h_pg in detail.
21  - <a href="annotated.html">\b Data \b Structures </a> describe the data structures of the \ref device_h_pg in detail.
22
23 CMSIS-Core (Cortex-M) in ARM::CMSIS Pack
24 -----------------------------
25
26 Files relevant to CMSIS-Core (Cortex-M) are present in the following <b>ARM::CMSIS</b> directories:
27 |File/Folder                   |Content                                                                 |
28 |------------------------------|------------------------------------------------------------------------|
29 |\b CMSIS\\Documentation\\Core | This documentation                                                     |
30 |\b CMSIS\\Core\\Include       | CMSIS-Core (Cortex-M) header files (for example core_cm3.h, core_cmInstr.h, etc.) |
31 |\b Device                     | \ref using_ARM_pg "Arm reference implementations" of Cortex-M devices  |
32 |\b Device\\\_Template_Vendor  | \ref templates_pg for extension by silicon vendors                     |
33
34 \section ref_v6-v8M Processor Support
35
36 CMSIS supports the complete range of <a href="https://developer.arm.com/products/processors/cortex-m" target="_blank"><b>Cortex-M processors</b></a> and
37 the <a href="https://developer.arm.com/architectures/cpu-architecture/m-profile" target="_blank"><b>Armv8-M/v8.1-M architecture</b></a> including security extensions.
38
39 \subsection ref_man_sec Cortex-M Generic User Guides
40
41 The Cortex-M Device Generic User Guides contain the programmers model and detailed information about the core peripherals and are available for:
42
43 - <a href="https://developer.arm.com/documentation/dui0497/latest/" target="_blank"><b>Cortex-M0 Devices Generic User Guide</b></a> (Armv6-M architecture)
44 - <a href="https://developer.arm.com/documentation/dui0662/latest/"  target="_blank"><b>Cortex-M0+ Devices Generic User Guide</b></a> (Armv6-M architecture)
45 - <a href="https://developer.arm.com/documentation/dui0552/latest/"  target="_blank"><b>Cortex-M3 Devices Generic User Guide</b></a> (Armv7-M architecture)
46 - <a href="https://developer.arm.com/documentation/dui0553/latest/"  target="_blank"><b>Cortex-M4 Devices Generic User Guide</b></a> (Armv7-M architecture)
47 - <a href="https://developer.arm.com/documentation/dui0646/latest/"  target="_blank"><b>Cortex-M7 Devices Generic User Guide</b></a> (Armv7-M architecture)
48 - <a href="https://developer.arm.com/documentation/dui1095/latest/"  target="_blank"><b>Cortex-M23 Devices Generic User Guide</b></a> (Armv8-M architecture)
49 - <a href="https://developer.arm.com/documentation/100235/latest/"   target="_blank"><b>Cortex-M33 Devices Generic User Guide</b></a> (Armv8-M architecture)
50 - <a href="https://developer.arm.com/documentation/101273/latest/"   target="_blank"><b>Cortex-M55 Devices Generic User Guide</b></a> (Armv8.1-M architecture)
51 - <a href="https://developer.arm.com/documentation/101928/latest"   target="_blank"><b>Cortex-M85 Devices Generic User Guide</b></a> (Armv8.1-M architecture)
52
53 CMSIS also supports the following Cortex-M processor variants:
54 - <a href="https://developer.arm.com/products/processors/cortex-m/cortex-m1"       target="_blank"><b>Cortex-M1</b></a> is a processor designed specifically for implementation in FPGAs (Armv6-M architecture).
55 - <a href="https://developer.arm.com/products/processors/cortex-m/sc000-processor" target="_blank"><b>SecurCore SC000</b></a> is designed specifically for smartcard and security applications (Armv6-M architecture).
56 - <a href="https://developer.arm.com/products/processors/cortex-m/sc300-processor" target="_blank"><b>SecurCore SC300</b></a> is designed specifically for smartcard and security applications (Armv7-M architecture).
57 - <a href="https://developer.arm.com/products/processors/cortex-m/cortex-m35p"     target="_blank"><b>Cortex-M35P</b></a> is a tamper resistant Cortex-M processor with optional software isolation using TrustZone for Armv8-M.
58 - <a href="https://www.armchina.com/mountain?infoId=160"                           target="_blank"><b>STAR-MC1</b></a> is a variant of Armv8-M with TrustZone designed by Arm China.
59
60
61 \subsection ARMv8M Armv8-M and Armv8.1-M Architecture
62
63 Armv8-M introduces two profiles \b baseline (for power and area constrained applications) and \b mainline (full-featured with optional SIMD, floating-point, and co-processor extensions).
64 Both Armv8-M profiles and Armv8.1-M are supported by CMSIS.
65
66 The Armv8-M architecture is described in the <a href="https://developer.arm.com/documentation/ddi0553/latest/" target="_blank"><b>Armv8-M Architecture Reference Manual</b></a>.
67
68 The Armv8.1-M architecture further extends Armv8-M with Helium (the so called M-Profile Vector Extension (MVE)), as well as further instruction set and debug extensions.
69 More information about Armv8.1-M architecture is available under <a href="https://developer.arm.com/technologies/helium" target="_blank"><b>Arm Helium technology</b></a>.
70
71 \section tested_tools_sec Tested and Verified Toolchains
72
73 The \ref templates_pg supplied by Arm have been tested and verified with the following toolchains:
74  - Arm: Arm Compiler 5.06 update 7 (not for Cortex-M23/33/35P/55/85, Armv8-M, Armv8.1-M)
75  - Arm: Arm Compiler 6.16
76  - Arm: Arm Compiler 6.6.4 (not for Cortex-M0/23/33/35P/55/85, Armv8-M, Armv8.1-M)
77  - GNU: GNU Arm Embedded Toolchain 10-2020-q4-major (10.2.1 20201103)
78  - IAR: IAR ANSI C/C++ Compiler for Arm 8.20.1.14183
79 */
80 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
81 /**
82
83 \page core_revisionHistory Revision History of CMSIS-Core (Cortex-M)
84
85 <table class="cmtable" summary="Revision History">
86     <tr>
87       <th>Version</th>
88       <th>Description</th>
89     </tr>
90     <tr>
91       <td>V5.7.0</td>
92       <td>
93         <ul>
94           <li>Added: Added new compiler macros __ALIAS and __NO_INIT</li>
95         </ul>
96       </td>
97     </tr>
98     <tr>
99       <td>V5.6.0</td>
100       <td>
101         <ul>
102           <li>Added: Arm Cortex-M85 cpu support</li>
103           <li>Added: Arm China Star-MC1 cpu support</li>
104           <li>Updated: system_ARMCM55.c</li>
105         </ul>
106       </td>
107     </tr>
108     <tr>
109       <td>V5.5.0</td>
110       <td>
111         <ul>
112           <li>Updated GCC LinkerDescription, GCC Assembler startup</li>
113           <li>Added ARMv8-M Stack Sealing (to linker, startup) for toolchain ARM, GCC</li>
114           <li>Changed C-Startup to default Startup.</li>
115           </li>
116             Updated Armv8-M Assembler startup to use GAS syntax<br>
117             Note: Updating existing projects may need manual user interaction!
118           </li>
119         </ul>
120       </td>
121     </tr>
122     <tr>
123       <td>V5.4.0</td>
124       <td>
125         <ul>
126           <li>Added: Cortex-M55 cpu support</li>
127           <li>Enhanced: MVE support for Armv8.1-MML</li>
128           <li>Fixed: Device config define checks</li>
129           <li>Added: L1 Cache functions for Armv7-M and later</li>
130         </ul>
131       </td>
132     </tr>
133     <tr>
134       <td>V5.3.0</td>
135       <td>
136         <ul>
137           <li>Added: Provisions for compiler-independent C startup code.</li>
138         </ul>
139       </td>
140     </tr>
141     <tr>
142       <td>V5.2.1</td>
143       <td>
144         <ul>
145           <li>Fixed: Compilation issue in cmsis_armclang_ltm.h introduced in 5.2.0</li>
146         </ul>
147       </td>
148     </tr>
149     <tr>
150       <td>V5.2.0</td>
151       <td>
152         <ul>
153           <li>Added: Cortex-M35P support.</li>
154           <li>Added: Cortex-M1 support.
155           <li>Added: Armv8.1 architecture support.
156           <li>Added: \ref __RESTRICT and \ref __STATIC_FORCEINLINE compiler control macros.
157         </ul>
158       </td>
159     </tr>
160     <tr>
161       <td>V5.1.2</td>
162       <td>
163         <ul>
164           <li>Removed using get/set built-ins FPSCR in GCC >= 7.2 due to shortcomings.</li>
165           <li>Added __NO_RETURN to __NVIC_SystemReset() to silence compiler warnings.</li>
166           <li>Added support for Cortex-M1 (beta).</li>
167           <li>Removed usage of register keyword.</li>
168           <li>Added defines for EXC_RETURN, FNC_RETURN and integrity signature values.</li>
169           <li>Enhanced MPUv7 API with defines for memory access attributes.</li>
170         </ul>
171       </td>
172     </tr>
173     <tr>
174       <td>V5.1.1</td>
175       <td>
176         <ul>
177           <li>Aligned MSPLIM and PSPLIM access functions along supported compilers.</li>
178         </ul>
179       </td>
180     </tr>
181     <tr>
182       <td>V5.1.0</td>
183       <td>
184         <ul>
185           <li>Added MPU Functions for ARMv8-M for Cortex-M23/M33.</li>
186           <li>Moved __SSAT and __USAT intrinsics to CMSIS-Core.</li>
187           <li>Aligned __REV, __REV16 and __REVSH intrinsics along supported compilers.</li>
188         </ul>
189       </td>
190     </tr>
191     <tr>
192       <td>V5.0.2</td>
193       <td>
194         <ul>
195           <li>Added macros  \ref \__UNALIGNED_UINT16_READ,  \ref \__UNALIGNED_UINT16_WRITE.</li>
196           <li>Added macros  \ref \__UNALIGNED_UINT32_READ,  \ref \__UNALIGNED_UINT32_WRITE.</li>
197           <li>Deprecated macro  \ref \__UNALIGNED_UINT32.</li>
198           <li>Changed \ref version_control_gr macros to be core agnostic.</li>
199           <li>Added \ref mpu_functions for Cortex-M0+/M3/M4/M7.</li>
200         </ul>
201       </td>
202     </tr>
203     <tr>
204       <td>V5.0.1</td>
205       <td>
206         <ul>
207           <li>Added: macro \ref \__PACKED_STRUCT.</li>
208           <li>Added: uVisor support.</li>
209         </ul>
210       </td>
211     </tr>
212     <tr>
213       <td>V5.00</td>
214       <td>
215         <ul>
216           <li>Added: Cortex-M23, Cortex-M33 support.</li>
217           <li>Added: macro __SAU_PRESENT with __SAU_REGION_PRESENT.</li>
218           <li>Replaced: macro __SAU_PRESENT with __SAU_REGION_PRESENT.</li>
219           <li>Reworked: SAU register and functions.</li>
220           <li>Added: macro \ref \__ALIGNED.</li>
221           <li>Updated: function \ref SCB_EnableICache.</li>
222           <li>Added: cmsis_compiler.h with compiler specific CMSIS macros, functions, instructions.</li>
223           <li>Added: macro \ref \__PACKED.</li>
224           <li>Updated: compiler specific include files.</li>
225           <li>Updated: core dependant include files.</li>
226           <li>Removed: deprecated files core_cmfunc.h, core_cminstr.h, core_cmsimd.h.</li>
227         </ul>
228       </td>
229     </tr>
230     <tr>
231       <td>V5.00<br>Beta 6</td>
232       <td>
233         <ul>
234           <li>Added: SCB_CFSR register bit definitions.</li>
235           <li>Added: function \ref NVIC_GetEnableIRQ.</li>
236           <li>Updated: core instruction macros \ref \__NOP, \ref \__WFI, \ref \__WFE, \ref \__SEV for toolchain GCC.</li>
237         </ul>
238       </td>
239     </tr>
240     <tr>
241       <td>V5.00<br>Beta 5</td>
242       <td>
243         <ul>
244           <li>Moved: DSP libraries from CMSIS/DSP/Lib to CMSIS/Lib.</li>
245           <li>Added: DSP libraries build projects to CMSIS pack.</li>
246         </ul>
247       </td>
248     </tr>
249     <tr>
250       <td>V5.00<br>Beta 4</td>
251       <td>
252         <ul>
253           <li>Updated: ARMv8M device files.</li>
254           <li>Corrected: ARMv8MBL interrupts.</li>
255           <li>Reworked: NVIC functions.</li>
256         </ul>
257       </td>
258     </tr>
259     <tr>
260       <td>V5.00<br>Beta 2</td>
261       <td>
262         <ul>
263           <li>Changed: ARMv8M SAU regions to 8.</li>
264           <li>Changed: moved function \ref TZ_SAU_Setup to file partition_&lt;device&gt;.h.</li>
265           <li>Changed: license under Apache-2.0.</li>
266           <li>Added: check if macro is defined before use.</li>
267           <li>Corrected: function \ref SCB_DisableDCache.</li>
268           <li>Corrected: macros \ref \_VAL2FLD, \ref \_FLD2VAL.</li>
269           <li>Added: NVIC function virtualization with macros \ref CMSIS_NVIC_VIRTUAL and \ref CMSIS_VECTAB_VIRTUAL.</li>
270         </ul>
271       </td>
272     </tr>
273     <tr>
274       <td>V5.00<br>Beta 1</td>
275       <td>
276         <ul>
277           <li>Renamed: cmsis_armcc_V6.h to cmsis_armclang.h.</li>
278           <li>Renamed: core\_*.h to lower case.</li>
279           <li>Added: function \ref SCB_GetFPUType to all CMSIS cores.</li>
280           <li>Added: ARMv8-M support.</li>
281         </ul>
282       </td>
283     </tr>
284     <tr>
285       <td>V4.30</td>
286       <td>
287         <ul>
288           <li>Corrected: DoxyGen function parameter comments.</li>
289           <li>Corrected: IAR toolchain: removed for \ref NVIC_SystemReset the attribute(noreturn).</li>
290           <li>Corrected: GCC toolchain: suppressed irrelevant compiler warnings.</li>
291           <li>Added: Support files for Arm Compiler v6 (cmsis_armcc_v6.h).</li>
292         </ul>
293       </td>
294     </tr>
295     <tr>
296       <td>V4.20</td>
297       <td>
298         <ul>
299           <li>Corrected: MISRA-C:2004 violations.</li>
300           <li>Corrected: predefined macro for TI CCS Compiler.</li>
301           <li>Corrected: function \ref __SHADD16 in arm_math.h.</li>
302           <li>Updated: cache functions for Cortex-M7.</li>
303           <li>Added: macros \ref _VAL2FLD, \ref _FLD2VAL to core\_*.h.</li>
304           <li>Updated: functions \ref __QASX, \ref __QSAX, \ref __SHASX, \ref __SHSAX.</li>
305           <li>Corrected: potential bug in function \ref __SHADD16.</li>
306         </ul>
307       </td>
308     </tr>
309     <tr>
310       <td>V4.10</td>
311       <td>
312         <ul>
313           <li>Corrected: MISRA-C:2004 violations.</li>
314           <li>Corrected: intrinsic functions \ref __DSB, \ref __DMB, \ref __ISB.</li>
315           <li>Corrected: register definitions for ITCMCR register.</li>
316           <li>Corrected: register definitions for \ref CONTROL_Type register.</li>
317           <li>Added: functions \ref SCB_GetFPUType, \ref SCB_InvalidateDCache_by_Addr to core_cm7.h.</li>
318           <li>Added: register definitions for \ref APSR_Type, \ref IPSR_Type, \ref xPSR_Type register.</li>
319           <li>Added: \ref __set_BASEPRI_MAX function to core_cmFunc.h.</li>
320           <li>Added: intrinsic functions \ref __RBIT, \ref __CLZ  for Cortex-M0/CortexM0+.</li>
321         </ul>
322       </td>
323     </tr>
324     <tr>
325       <td>V4.00</td>
326       <td>
327         <ul>
328           <li>Added: Cortex-M7 support.</li>
329           <li>Added: intrinsic functions for \ref __RRX, \ref __LDRBT, \ref __LDRHT, \ref __LDRT, \ref __STRBT, \ref __STRHT, and \ref __STRT</li>
330         </ul>
331       </td>
332     </tr>
333     <tr>
334       <td>V3.40</td>
335       <td>
336        <ul>
337          <li>Corrected: C++ include guard settings.</li>
338        </ul>
339      </td>
340     </tr>
341     <tr>
342       <td>V3.30</td>
343       <td>
344         <ul>
345           <li>Added: COSMIC tool chain support.</li>
346           <li>Corrected: GCC __SMLALDX instruction intrinsic for Cortex-M4.</li>
347           <li>Corrected: GCC __SMLALD instruction intrinsic for Cortex-M4.</li>
348           <li>Corrected: GCC/CLang warnings.</li>
349         </ul>
350       </td>
351     </tr>
352     <tr>
353       <td>V3.20</td>
354       <td>
355         <ul>
356           <li>Added: \ref __BKPT instruction intrinsic.</li>
357           <li>Added: \ref __SMMLA instruction intrinsic for Cortex-M4.</li>
358           <li>Corrected: \ref ITM_SendChar.</li>
359           <li>Corrected: \ref __enable_irq, \ref __disable_irq and inline assembly for GCC Compiler.</li>
360           <li>Corrected: \ref NVIC_GetPriority and VTOR_TBLOFF for Cortex-M0/M0+, SC000.</li>
361           <li>Corrected: rework of in-line assembly functions to remove potential compiler warnings.</li>
362         </ul>
363       </td>
364     </tr>
365     <tr>
366       <td>V3.01</td>
367       <td>
368        <ul>
369          <li>Added support for Cortex-M0+ processor.</li>
370        </ul>
371      </td>
372     </tr>
373     <tr>
374       <td>V3.00</td>
375       <td>
376         <ul>
377           <li>Added support for GNU GCC ARM Embedded Compiler.</li>
378           <li>Added function \ref __ROR.</li>
379           <li>Added \ref regMap_pg for TPIU, DWT.</li>
380           <li>Added support for \ref core_config_sect "SC000 and SC300 processors".</li>
381           <li>Corrected \ref ITM_SendChar function.</li>
382           <li>Corrected the functions \ref __STREXB, \ref __STREXH, \ref __STREXW for the GNU GCC compiler section.</li>
383           <li>Documentation restructured.</li>
384         </ul>
385       </td>
386     </tr>
387     <tr>
388       <td>V2.10</td>
389       <td>
390         <ul>
391           <li>Updated documentation.</li>
392           <li>Updated CMSIS core include files.</li>
393           <li>Changed CMSIS/Device folder structure.</li>
394           <li>Added support for Cortex-M0, Cortex-M4 w/o FPU to CMSIS DSP library.</li>
395           <li>Reworked CMSIS DSP library examples.</li>
396         </ul>
397       </td>
398     </tr>
399     <tr>
400       <td>V2.00</td>
401       <td>
402        <ul>
403          <li>Added support for Cortex-M4 processor.</li>
404        </ul>
405      </td>
406     </tr>
407     <tr>
408       <td>V1.30</td>
409       <td>
410         <ul>
411           <li>Reworked Startup Concept.</li>
412           <li>Added additional Debug Functionality.</li>
413           <li>Changed folder structure.</li>
414           <li>Added doxygen comments.</li>
415           <li>Added definitions for bit.</li>
416         </ul>
417       </td>
418     </tr>
419     <tr>
420       <td>V1.01</td>
421       <td>
422        <ul>
423          <li>Added support for Cortex-M0 processor.</li>
424        </ul>
425       </td>
426     </tr>
427     <tr>
428       <td>V1.01</td>
429       <td>
430        <ul>
431          <li>Added intrinsic functions for \ref __LDREXB, \ref __LDREXH, \ref __LDREXW, \ref __STREXB, \ref __STREXH, \ref __STREXW, and \ref __CLREX</li>
432        </ul>
433      </td>
434     </tr>
435     <tr>
436       <td>V1.00</td>
437       <td>
438        <ul>
439          <li>Initial Release for Cortex-M3 processor.</li>
440        </ul>
441      </td>
442     </tr>
443 </table>
444
445 */