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.
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.
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.
16 - \ref using_TrustZone_pg "Using TrustZone® for Armv8-M" describes how to use the security extensions available in the Armv8-M architecture.
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.
25 CMSIS-Core (Cortex-M) in ARM::CMSIS Pack
26 -----------------------------
28 Files relevant to CMSIS-Core (Cortex-M) are present in the following <b>ARM::CMSIS</b> directories:
29 |File/Folder |Content |
30 |------------------------------|------------------------------------------------------------------------|
31 |\b CMSIS\\Documentation\\Core | This documentation |
32 |\b CMSIS\\Core\\Include | CMSIS-Core (Cortex-M) header files (for example core_cm3.h, core_cmInstr.h, etc.) |
33 |\b Device | \ref using_ARM_pg "Arm reference implementations" of Cortex-M devices |
34 |\b Device\\\_Template_Vendor | \ref templates_pg for extension by silicon vendors |
38 \section ref_v6-v8M Processor Support
40 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
41 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.
43 \subsection ref_man_sec Cortex-M Generic User Guides
45 The Cortex-M Device Generic User Guides contain the programmers model and detailed information about the core peripherals and are available for:
47 - <a href="https://developer.arm.com/documentation/dui0497/latest/" target="_blank"><b>Cortex-M0 Devices Generic User Guide</b></a> (Armv6-M architecture)
48 - <a href="https://developer.arm.com/documentation/dui0662/latest/" target="_blank"><b>Cortex-M0+ Devices Generic User Guide</b></a> (Armv6-M architecture)
49 - <a href="https://developer.arm.com/documentation/dui0552/latest/" target="_blank"><b>Cortex-M3 Devices Generic User Guide</b></a> (Armv7-M architecture)
50 - <a href="https://developer.arm.com/documentation/dui0553/latest/" target="_blank"><b>Cortex-M4 Devices Generic User Guide</b></a> (Armv7-M architecture)
51 - <a href="https://developer.arm.com/documentation/dui0646/latest/" target="_blank"><b>Cortex-M7 Devices Generic User Guide</b></a> (Armv7-M architecture)
52 - <a href="https://developer.arm.com/documentation/dui1095/latest/" target="_blank"><b>Cortex-M23 Devices Generic User Guide</b></a> (Armv8-M architecture)
53 - <a href="https://developer.arm.com/documentation/100235/latest/" target="_blank"><b>Cortex-M33 Devices Generic User Guide</b></a> (Armv8-M architecture)
54 - <a href="https://developer.arm.com/documentation/101273/latest/" target="_blank"><b>Cortex-M55 Devices Generic User Guide</b></a> (Armv8.1-M architecture)
55 - <a href="https://developer.arm.com/documentation/101928/latest" target="_blank"><b>Cortex-M85 Devices Generic User Guide</b></a> (Armv8.1-M architecture)
57 CMSIS also supports the following Cortex-M processor variants:
58 - <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).
59 - <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).
60 - <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).
61 - <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.
62 - <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.
65 \subsection ARMv8M Armv8-M and Armv8.1-M Architecture
67 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).
68 Both Armv8-M profiles and Armv8.1-M are supported by CMSIS.
70 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>.
72 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.
73 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>.
77 \section tested_tools_sec Tested and Verified Toolchains
79 The \ref templates_pg supplied by Arm have been tested and verified with the following toolchains:
80 - Arm: Arm Compiler 5.06 update 7 (not for Cortex-M23/33/35P/55/85, Armv8-M, Armv8.1-M)
81 - Arm: Arm Compiler 6.16
82 - Arm: Arm Compiler 6.6.4 (not for Cortex-M0/23/33/35P/55/85, Armv8-M, Armv8.1-M)
83 - GNU: GNU Arm Embedded Toolchain 10-2020-q4-major (10.2.1 20201103)
84 - IAR: IAR ANSI C/C++ Compiler for Arm 8.20.1.14183
86 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
89 \page core_revisionHistory Revision History of CMSIS-Core (Cortex-M)
91 <table class="cmtable" summary="Revision History">
100 <li>Added: Added new compiler macros __ALIAS and __NO_INIT</li>
108 <li>Added: Arm Cortex-M85 cpu support</li>
109 <li>Added: Arm China Star-MC1 cpu support</li>
110 <li>Updated: system_ARMCM55.c</li>
118 <li>Updated GCC LinkerDescription, GCC Assembler startup</li>
119 <li>Added ARMv8-M Stack Sealing (to linker, startup) for toolchain ARM, GCC</li>
120 <li>Changed C-Startup to default Startup.</li>
122 Updated Armv8-M Assembler startup to use GAS syntax<br>
123 Note: Updating existing projects may need manual user interaction!
133 <li>Added: Cortex-M55 cpu support</li>
134 <li>Enhanced: MVE support for Armv8.1-MML</li>
136 <li>Fixed: Device config define checks</li>
137 <li>Added: L1 Cache functions for Armv7-M and later</li>
145 <li>Added: Provisions for compiler-independent C startup code.</li>
153 <li>Fixed: Compilation issue in cmsis_armclang_ltm.h introduced in 5.2.0</li>
161 <li>Added: Cortex-M35P support.</li>
162 <li>Added: Cortex-M1 support.
163 <li>Added: Armv8.1 architecture support.
164 <li>Added: \ref __RESTRICT and \ref __STATIC_FORCEINLINE compiler control macros.
172 <li>Removed using get/set built-ins FPSCR in GCC >= 7.2 due to shortcomings.</li>
173 <li>Added __NO_RETURN to __NVIC_SystemReset() to silence compiler warnings.</li>
174 <li>Added support for Cortex-M1 (beta).</li>
175 <li>Removed usage of register keyword.</li>
176 <li>Added defines for EXC_RETURN, FNC_RETURN and integrity signature values.</li>
177 <li>Enhanced MPUv7 API with defines for memory access attributes.</li>
185 <li>Aligned MSPLIM and PSPLIM access functions along supported compilers.</li>
193 <li>Added MPU Functions for ARMv8-M for Cortex-M23/M33.</li>
194 <li>Moved __SSAT and __USAT intrinsics to CMSIS-Core.</li>
195 <li>Aligned __REV, __REV16 and __REVSH intrinsics along supported compilers.</li>
203 <li>Added macros \ref \__UNALIGNED_UINT16_READ, \ref \__UNALIGNED_UINT16_WRITE.</li>
204 <li>Added macros \ref \__UNALIGNED_UINT32_READ, \ref \__UNALIGNED_UINT32_WRITE.</li>
205 <li>Deprecated macro \ref \__UNALIGNED_UINT32.</li>
206 <li>Changed \ref version_control_gr macros to be core agnostic.</li>
207 <li>Added \ref mpu_functions for Cortex-M0+/M3/M4/M7.</li>
215 <li>Added: macro \ref \__PACKED_STRUCT.</li>
216 <li>Added: uVisor support.</li>
224 <li>Added: Cortex-M23, Cortex-M33 support.</li>
225 <li>Added: macro __SAU_PRESENT with __SAU_REGION_PRESENT.</li>
226 <li>Replaced: macro __SAU_PRESENT with __SAU_REGION_PRESENT.</li>
227 <li>Reworked: SAU register and functions.</li>
228 <li>Added: macro \ref \__ALIGNED.</li>
229 <li>Updated: function \ref SCB_EnableICache.</li>
230 <li>Added: cmsis_compiler.h with compiler specific CMSIS macros, functions, instructions.</li>
231 <li>Added: macro \ref \__PACKED.</li>
232 <li>Updated: compiler specific include files.</li>
233 <li>Updated: core dependant include files.</li>
234 <li>Removed: deprecated files core_cmfunc.h, core_cminstr.h, core_cmsimd.h.</li>
239 <td>V5.00<br>Beta 6</td>
242 <li>Added: SCB_CFSR register bit definitions.</li>
243 <li>Added: function \ref NVIC_GetEnableIRQ.</li>
244 <li>Updated: core instruction macros \ref \__NOP, \ref \__WFI, \ref \__WFE, \ref \__SEV for toolchain GCC.</li>
249 <td>V5.00<br>Beta 5</td>
252 <li>Moved: DSP libraries from CMSIS/DSP/Lib to CMSIS/Lib.</li>
253 <li>Added: DSP libraries build projects to CMSIS pack.</li>
258 <td>V5.00<br>Beta 4</td>
261 <li>Updated: ARMv8M device files.</li>
262 <li>Corrected: ARMv8MBL interrupts.</li>
263 <li>Reworked: NVIC functions.</li>
268 <td>V5.00<br>Beta 2</td>
272 <li>Changed: ARMv8M SAU regions to 8.</li>
273 <li>Changed: moved function \ref TZ_SAU_Setup to file partition_<device>.h.</li>
275 <li>Changed: license under Apache-2.0.</li>
276 <li>Added: check if macro is defined before use.</li>
277 <li>Corrected: function \ref SCB_DisableDCache.</li>
278 <li>Corrected: macros \ref \_VAL2FLD, \ref \_FLD2VAL.</li>
279 <li>Added: NVIC function virtualization with macros \ref CMSIS_NVIC_VIRTUAL and \ref CMSIS_VECTAB_VIRTUAL.</li>
284 <td>V5.00<br>Beta 1</td>
287 <li>Renamed: cmsis_armcc_V6.h to cmsis_armclang.h.</li>
288 <li>Renamed: core\_*.h to lower case.</li>
289 <li>Added: function \ref SCB_GetFPUType to all CMSIS cores.</li>
290 <li>Added: ARMv8-M support.</li>
298 <li>Corrected: DoxyGen function parameter comments.</li>
299 <li>Corrected: IAR toolchain: removed for \ref NVIC_SystemReset the attribute(noreturn).</li>
300 <li>Corrected: GCC toolchain: suppressed irrelevant compiler warnings.</li>
301 <li>Added: Support files for Arm Compiler v6 (cmsis_armcc_v6.h).</li>
309 <li>Corrected: MISRA-C:2004 violations.</li>
310 <li>Corrected: predefined macro for TI CCS Compiler.</li>
311 <li>Corrected: function \ref __SHADD16 in arm_math.h.</li>
312 <li>Updated: cache functions for Cortex-M7.</li>
313 <li>Added: macros \ref _VAL2FLD, \ref _FLD2VAL to core\_*.h.</li>
314 <li>Updated: functions \ref __QASX, \ref __QSAX, \ref __SHASX, \ref __SHSAX.</li>
315 <li>Corrected: potential bug in function \ref __SHADD16.</li>
323 <li>Corrected: MISRA-C:2004 violations.</li>
324 <li>Corrected: intrinsic functions \ref __DSB, \ref __DMB, \ref __ISB.</li>
325 <li>Corrected: register definitions for ITCMCR register.</li>
326 <li>Corrected: register definitions for \ref CONTROL_Type register.</li>
327 <li>Added: functions \ref SCB_GetFPUType, \ref SCB_InvalidateDCache_by_Addr to core_cm7.h.</li>
328 <li>Added: register definitions for \ref APSR_Type, \ref IPSR_Type, \ref xPSR_Type register.</li>
329 <li>Added: \ref __set_BASEPRI_MAX function to core_cmFunc.h.</li>
330 <li>Added: intrinsic functions \ref __RBIT, \ref __CLZ for Cortex-M0/CortexM0+.</li>
338 <li>Added: Cortex-M7 support.</li>
339 <li>Added: intrinsic functions for \ref __RRX, \ref __LDRBT, \ref __LDRHT, \ref __LDRT, \ref __STRBT, \ref __STRHT, and \ref __STRT</li>
347 <li>Corrected: C++ include guard settings.</li>
355 <li>Added: COSMIC tool chain support.</li>
356 <li>Corrected: GCC __SMLALDX instruction intrinsic for Cortex-M4.</li>
357 <li>Corrected: GCC __SMLALD instruction intrinsic for Cortex-M4.</li>
358 <li>Corrected: GCC/CLang warnings.</li>
366 <li>Added: \ref __BKPT instruction intrinsic.</li>
367 <li>Added: \ref __SMMLA instruction intrinsic for Cortex-M4.</li>
368 <li>Corrected: \ref ITM_SendChar.</li>
369 <li>Corrected: \ref __enable_irq, \ref __disable_irq and inline assembly for GCC Compiler.</li>
370 <li>Corrected: \ref NVIC_GetPriority and VTOR_TBLOFF for Cortex-M0/M0+, SC000.</li>
371 <li>Corrected: rework of in-line assembly functions to remove potential compiler warnings.</li>
379 <li>Added support for Cortex-M0+ processor.</li>
387 <li>Added support for GNU GCC ARM Embedded Compiler.</li>
388 <li>Added function \ref __ROR.</li>
389 <li>Added \ref regMap_pg for TPIU, DWT.</li>
390 <li>Added support for \ref core_config_sect "SC000 and SC300 processors".</li>
391 <li>Corrected \ref ITM_SendChar function.</li>
392 <li>Corrected the functions \ref __STREXB, \ref __STREXH, \ref __STREXW for the GNU GCC compiler section.</li>
393 <li>Documentation restructured.</li>
401 <li>Updated documentation.</li>
402 <li>Updated CMSIS core include files.</li>
403 <li>Changed CMSIS/Device folder structure.</li>
404 <li>Added support for Cortex-M0, Cortex-M4 w/o FPU to CMSIS DSP library.</li>
405 <li>Reworked CMSIS DSP library examples.</li>
413 <li>Added support for Cortex-M4 processor.</li>
421 <li>Reworked Startup Concept.</li>
422 <li>Added additional Debug Functionality.</li>
423 <li>Changed folder structure.</li>
424 <li>Added doxygen comments.</li>
425 <li>Added definitions for bit.</li>
433 <li>Added support for Cortex-M0 processor.</li>
441 <li>Added intrinsic functions for \ref __LDREXB, \ref __LDREXH, \ref __LDREXW, \ref __STREXB, \ref __STREXH, \ref __STREXW, and \ref __CLREX</li>
449 <li>Initial Release for Cortex-M3 processor.</li>