COMMON

Detailed Description

General purpose utilities and cross-compiler support.

This SDK supports the following compilers/IDEs:

• Simplicity Studio
• IAR Embedded Workbench
• Atollic TrueSTUDIO IDE
• Rowley Associates CrossWorks for ARM
• Keil µVision IDE
• Plain armgcc

Certain compiler features such as alignment is implemented differently in the tools. Therefore, macros such as SL_ALIGN are provided to enable compiler independent code.

Note

RAM code macros are implemented in a separate module RAMFUNC. Cross-compiler RAM code support needs extended documentation and it is therefore implemented as a separate module.

Macros
#define	SL_ALIGN(X)
	Macro for aligning a variable. Use this macro before the variable definition. X denotes the storage alignment value in bytes. To be gcc compatible use SL_ATTRIBUTE_ALIGN(X) before the ; on normal variables. Use SL_ATTRIBUTE_ALIGN(X) before the opening { on struct variables.
#define	SL_ATTRIBUTE_ALIGN(X)   __attribute__ ((aligned(X)))
	GCC style macro for aligning a variable.
#define	SL_ATTRIBUTE_PACKED   __attribute__ ((packed))
	GCC style macro for handling packed structs.
#define	SL_ATTRIBUTE_SECTION(X)   __attribute__ ((section(X)))
#define	SL_MAX(a, b)   __extension__({__typeof__(a) _a = (a); __typeof__(b) _b = (b); _a > _b ? _a : _b;})
	Macro for getting maximum value. No sideeffects, a and b are evaluated once only.
#define	SL_MIN(a, b)   __extension__({__typeof__(a) _a = (a); __typeof__(b) _b = (b); _a < _b ? _a : _b;})
	Macro for getting minimum value. No sideeffects, a and b are evaluated once only.
#define	SL_NORETURN   __attribute__ ((noreturn))
	Macro for handling non-returning functions.
#define	SL_PACK_END()
	Macro for handling packed structs. Use this macro after the struct definition. With GCC, add SL_ATTRIBUTE_PACKED after the closing } of the struct definition.
#define	SL_PACK_START(x)
	Macro for handling packed structs. Use this macro before the struct definition. X denotes the maximum alignment of struct members. X is not supported with GCC. GCC always use 1 byte maximum alignment.
#define	SL_WEAK   __attribute__ ((weak))
	Macro for defining a weak symbol.

Functions
__STATIC_INLINE uint32_t	EFM32_CTZ (uint32_t value)
__STATIC_INLINE uint32_t	SL_CTZ (uint32_t value)
	Count trailing number of zeros. Use CLZ instruction if available. More...

Macro Definition Documentation

#define SL_ATTRIBUTE_SECTION

(

X

)

__attribute__ ((section(X)))

Macro for placing a variable in a section.
Use this macro after the variable definition, before the = or ;.
X denotes the section to place the variable in.

Definition at line 180 of file em_common.h.

Function Documentation

__STATIC_INLINE uint32_t SL_CTZ

(

uint32_t

value

)

Count trailing number of zeros. Use CLZ instruction if available.

Parameters

[in]

value

Data value to check for number of trailing zero bits.

Returns

Number of trailing zeros in value.

Definition at line 194 of file em_common.h.

Referenced by GPIOINT_CallbackRegister(), and RMU_ResetControl().