1 /**************************************************************************************************/
3 \defgroup compiler_conntrol_gr Compiler Control
4 \brief Compiler agnostic \#define symbols for generic C/C++ source code
6 The CMSIS-Core provides the header file <b>cmsis_compiler.h</b> with consistent \#define symbols for generate C or C++ source files that should be compiler agnostic.
7 Each CMSIS compliant compiler should support the functionality described in this section.
9 The header file <b>cmsis_compiler.h</b> is also included by each \ref device_h_pg so that these definitions are available.
15 \brief Set to 1 when generating code for Armv6-M (Cortex-M0, Cortex-M1)
17 The <b>\#define __ARM_ARCH_6M__</b> is set to 1 when generating code for the Armv6-M architecture. This architecture is for example used by the Cortex-M0, Cortex-M0+, and Cortex-M1 processor.
19 #define __ARM_ARCH_6M__
23 \brief Set to 1 when generating code for Armv7-M (Cortex-M3)
25 The <b>\#define __ARM_ARCH_7M__</b> is set to 1 when generating code for the Armv7-M architecture. This architecture is for example used by the Cortex-M3 processor.
27 #define __ARM_ARCH_7M__
31 \brief Set to 1 when generating code for Armv7-M (Cortex-M4) with FPU
33 The <b>\#define __ARM_ARCH_7EM__</b> is set to 1 when generating code for the Armv7-M architecture with floating point extension. This architecture is for example used by the Cortex-M4 processor with FPU
35 #define __ARM_ARCH_7EM__
42 \def __ARM_ARCH_8M_BASE__
43 \brief Set to 1 when generating code for Armv8-M Baseline
45 The <b>\#define __ARM_ARCH_8M_BASE__</b> is set to 1 when generating code for the Armv8-M architecture baseline variant.
47 #define __ARM_ARCH_8M_BASE__
50 \def __ARM_ARCH_8M_MAIN__
51 \brief Set to 1 when generating code for Armv8-M Mainline
53 The <b>\#define __ARM_ARCH_8M_MAIN__</b> is set to 1 when generating code for the Armv8-M architecture mainline variant.
55 #define __ARM_ARCH_8M_MAIN__
62 /**************************************************************************************************/
65 \brief Pass information from the compiler to the assembler.
67 The \b __ASM keyword can declare or define an embedded assembly function or incorporate inline assembly into a function
68 (shown in the code example below).
72 // Reverse bit order of value
74 __attribute__( ( always_inline ) ) __STATIC_INLINE uint32_t __RBIT(uint32_t value)
78 __ASM volatile ("rbit %0, %1" : "=r" (result) : "r" (value) );
86 /**************************************************************************************************/
89 \brief Recommend that function should be inlined by the compiler.
91 Inline functions offer a trade-off between code size and performance. By default, the compiler decides during optimization whether to
92 inline code or not. The \b __INLINE attribute gives the compiler an hint to inline this function. Still, the compiler may decide not to inline
93 the function. As the function is global an callable function is also generated.
97 const uint32_t led_mask[] = {1U << 4, 1U << 5, 1U << 6, 1U << 7};
99 /*------------------------------------------------------------------------------
101 *------------------------------------------------------------------------------*/
102 __INLINE static void LED_On (uint32_t led) {
104 PTD->PCOR = led_mask[led];
111 /**************************************************************************************************/
114 \brief Define a static function should be inlined by the compiler.
116 Defines a static function that may be inlined by the compiler. If the compiler generates inline code for
117 all calls to this functions, no additional function implementation is generated which may further optimize space.
119 <b> Code Example:</b>
121 \\ Get Interrupt Vector
122 __STATIC_INLINE uint32_t NVIC_GetVector(IRQn_Type IRQn)
124 uint32_t *vectors = (uint32_t *)SCB->VTOR;
125 return vectors[(int32_t)IRQn + NVIC_USER_IRQ_OFFSET];
130 #define __STATIC_INLINE
132 /**************************************************************************************************/
135 \brief Inform the compiler that a function does not return.
137 Informs the compiler that the function does not return. The compiler can then perform optimizations by
138 removing code that is never reached.
140 <b> Code Example:</b>
142 // OS idle demon (running when no other thread is ready to run).
144 __NO_RETURN void os_idle_demon (void);
150 /**************************************************************************************************/
153 \brief Inform that a variable shall be retained in executable image.
155 Definitions tagged with \b __USED in the source code should be not removed by the linker when detected as unused.
157 <b> Code Example:</b>
159 /* Export following variables for debugging */
160 __USED uint32_t const CMSIS_RTOS_API_Version = osCMSIS;
161 __USED uint32_t const CMSIS_RTOS_RTX_Version = osCMSIS_RTX;
162 __USED uint32_t const os_clockrate = OS_TICK;
163 __USED uint32_t const os_timernum = 0;
169 /**************************************************************************************************/
172 \brief Export a function or variable weakly to allow overwrites.
174 Functions defined with \b __WEAK export their symbols weakly. A weakly defined function behaves like a normally defined
175 function unless a non-weakly defined function of the same name is linked into the same image. If both a non-weakly defined
176 function and a weakly defined function exist in the same image then all calls to the function resolve to call the non-weak
179 Functions declared with \b __WEAK and then defined without \b __WEAK behave as non-weak functions.
181 <b> Code Example:</b>
183 __WEAK void SystemInit(void)
186 SystemCoreClockSetup();
193 /**************************************************************************************************/
196 \brief Request smallest possible alignment.
198 Specifies that a type must have the smallest possible alignment.
200 <b> Code Example:</b>
204 uint32_t u32[2] __PACKED;
211 /**************************************************************************************************/
214 \brief Request smallest possible alignment for a structure.
216 Specifies that a structure must have the smallest possible alignment.
218 <b> Code Example:</b>
220 __PACKED_STRUCT foo {
228 #define __PACKED_STRUCT
230 /**************************************************************************************************/
232 \def __UNALIGNED_UINT32
233 \brief Pointer for unaligned access of a uint32_t variable.
235 Do not use this macro.
236 It has been superseded by \ref __UNALIGNED_UINT32_READ, \ref __UNALIGNED_UINT32_WRITE and will be removed in the future.
238 Defines a pointer to a uint32_t from an address that does not need to be aligned. This can then be used in read/write
239 operations. The compiler will generate the appropriate access (aligned or non-aligned) depending on the underlying Arm
240 processor core and compiler settings.
242 <b> Code Example:</b>
246 void test (uint8_t *ptr) {
247 __UNALIGNED_UINT32(ptr) = val32;
252 #define __UNALIGNED_UINT32
254 /**************************************************************************************************/
256 \def __UNALIGNED_UINT16_READ
257 \brief Pointer for unaligned read of a uint16_t variable.
259 Defines a pointer to a uint16_t from an address that does not need to be aligned. This can then be used in read
260 operations. The compiler will generate the appropriate access (aligned or non-aligned) depending on the underlying Arm
261 processor core and compiler settings.
263 <b> Code Example:</b>
267 void test (uint8_t *ptr) {
268 val16 = __UNALIGNED_UINT16_READ(ptr);
273 #define __UNALIGNED_UINT16_READ
275 /**************************************************************************************************/
277 \def __UNALIGNED_UINT16_WRITE
278 \brief Pointer for unaligned write of a uint16_t variable.
280 Defines a pointer to a uint16_t from an address that does not need to be aligned. This can then be used in write
281 operations. The compiler will generate the appropriate access (aligned or non-aligned) depending on the underlying Arm
282 processor core and compiler settings.
284 <b> Code Example:</b>
288 void test (uint8_t *ptr) {
289 __UNALIGNED_UINT16_WRITE(ptr, val16);
294 #define __UNALIGNED_UINT16_WRITE
296 /**************************************************************************************************/
298 \def __UNALIGNED_UINT32_READ
299 \brief Pointer for unaligned read of a uint32_t variable.
301 Defines a pointer to a uint32_t from an address that does not need to be aligned. This can then be used in read
302 operations. The compiler will generate the appropriate access (aligned or non-aligned) depending on the underlying Arm
303 processor core and compiler settings.
305 <b> Code Example:</b>
309 void test (uint8_t *ptr) {
310 val32 = __UNALIGNED_UINT32_READ(ptr);
315 #define __UNALIGNED_UINT32_READ
317 /**************************************************************************************************/
319 \def __UNALIGNED_UINT32_WRITE
320 \brief Pointer for unaligned write of a uint32_t variable.
322 Defines a pointer to a uint32_t from an address that does not need to be aligned. This can then be used in write
323 operations. The compiler will generate the appropriate access (aligned or non-aligned) depending on the underlying Arm
324 processor core and compiler settings.
326 <b> Code Example:</b>
330 void test (uint8_t *ptr) {
331 __UNALIGNED_UINT32_WRITE(ptr, val32);
336 #define __UNALIGNED_UINT32_WRITE
338 /**************************************************************************************************/
341 \brief Minimum alignment for a variable.
343 Specifies a minimum alignment for a variable or structure field, measured in bytes.
345 <b> Code Example:</b>
347 uint32_t stack_space[0x100] __ALIGNED(8); // 8-byte alignment required
353 /** @} */ /** end of compiler_conntrol_gr **/