BeRTOS
Defines | Typedefs | Functions
macros.h File Reference
#include <cfg/compiler.h>

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Defines

#define ALIGN_UP(value, align)
 Align value to the next align boundary.
#define MINMAX(min, x, max)   (MIN(MAX(min, x), max))
 Bound x between min and max.
#define SHUFFLE(array, len)
 Shuffle the content of array that counts len elements.
#define SWAP_T(a, b, T)
 Macro to swap a with b, with explicit type T for dumb C89 compilers.
#define REVERSE_UINT8(b)   ((uint8_t)((((b) * 0x0802UL & 0x22110UL) | ((b) * 0x8020UL & 0x88440UL)) * 0x10101UL >> 16))
 Reverse the bits contained in b (LSB becomes the MSB and so on).
#define BV(x)   (1<<(x))
 Convert a bit value to a binary flag.
#define BV32(x)   ((uint32_t)1<<(x))
 Same as BV() but with 32 bit result.
#define BV16(x)   ((uint16_t)1<<(x))
 Same as BV() but with 16 bit result.
#define BV8(x)   ((uint8_t)1<<(x))
 Same as BV() but with 8 bit result.
#define DIV_ROUND(dividend, divisor)   (((dividend) + (divisor) / 2) / (divisor))
 Perform an integer division rounding the result to the nearest int value.
#define DIV_ROUNDUP(dividend, divisor)   (((dividend) + (divisor) - 1) / (divisor))
 Perform an integer division rounding the result to the upper int value.
#define INT_MULT(a, f, prec)   (((a) * (long)((f) * (1 << (prec)) + 0.5)) >> (prec))
 Perform a multiply between the integer a and the float constant f.
#define ROUND_UP2(x, pad)   (((x) + ((pad) - 1)) & ~((pad) - 1))
 Round up x to an even multiple of the 2's power pad.
#define IS_POW2(x)   (!(bool)((x) & ((x)-1)))
 Check if x is an integer power of 2.
#define UINT8_LOG2(x)
 Calculate a compile-time log2 for a uint8_t.
#define UINT16_LOG2(x)   ((x < 256) ? UINT8_LOG2(x) : UINT8_LOG2((x) >> 8) + 8)
 Calculate a compile-time log2 for a uint16_t.
#define UINT32_LOG2(x)   ((x < 65536UL) ? UINT16_LOG2(x) : UINT16_LOG2((x) >> 16) + 16)
 Calculate a compile-time log2 for a uint32_t.
#define PP_COUNT(...)   PP_COUNT__(__VA_ARGS__,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
 Count the number of arguments (up to 16).
#define BIT_CHANGE(reg,...)   BIT_CHANGE__(reg, 0, __VA_ARGS__)
 This macro allows for efficient and compact bit toggling in a hardware register.
#define BIT_CHANGE_BV(reg,...)   BIT_CHANGE__(reg, 1, __VA_ARGS__)
 Similar to BIT_CHANGE(), but get bits instead of masks (and applies BV() to convert them to masks).
#define MAKE_ID(a, b, c, d)
 Make an id from 4 letters, useful for file formats and kfile ids.
Integer round macros.

Round x to a multiple of base.

Note:
If x is signed these macros generate a lot of code.
#define ROUND_DOWN(x, base)   ( (x) - ((x) % (base)) )
#define ROUND_UP(x, base)   ( ((x) + (base) - 1) - (((x) + (base) - 1) % (base)) )
#define ROUND_NEAREST(x, base)   ( ((x) + (base) / 2) - (((x) + (base) / 2) % (base)) )
#define ROTR(var, rot)   (((var) >> (rot)) | ((var) << ((sizeof(var) * 8) - (rot))))
 Macro for rotating bit left or right.
#define ROTL(var, rot)   (((var) << (rot)) | ((var) >> ((sizeof(var) * 8) - (rot))))
 Macro for rotating bit left or right.

Typedefs

typedef uint32_t id_t
 Type for id generated by MAKE_ID().

Functions

bool is_aligned (const void *addr, size_t size)
 Check if a pointer is aligned to a certain power-of-2 size.

Detailed Description

Definition in file macros.h.