macros.h File Reference

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Macros
#define	CLAMP(a, l, u)
	Clamp a number between an upper and lower bound.
#define	MIN(a, b)
	Find the smaller of two numbers.
#define	MAX(a, b)
	Find the larger of two numbers.
#define	ABS(a)
	Find the absolute value of a number.
#define	IS_ARRAY(arr)
	Return the number of elements in a fixed length array. This does not work for pointers.
#define	STATIC_EXP(e)
	Helper macro to determine the number of elements in an array. Should not be used directly.
#define	ARRAY_SIZE(arr)
#define	POS_MODULO_ADD(a, b, d)
	Returns (a + b) % d, but with negative values converted to equivalent positive values. The resulting value will always be in the range [0, d), assuming d > 0.
#define	RUN_TIMER_EVERY(timer, period, elapsed, timer_code)
	Run timer_code every period, using tracking it with timer.
#define	NUM_FRAME_TIMES   60
#define	DRAW_FPS_COUNTER(font)

Macro Definition Documentation

CLAMP

#define CLAMP	(		a,
			l,
			u )

Value:

((a) < l ? l : ((a) > u ? u : (a)))

Clamp a number between an upper and lower bound.

Parameters

a	A number to clamp between an upper and lower bound
l	The lower bound, inclusive
u	The upper bound, inclusive

Returns

The clamped number

MIN

#define MIN	(		a,
			b )

Value:

(((a) < (b)) ? (a) : (b))

Find the smaller of two numbers.

Parameters

a	A number to compare
b	Another number to compare

Returns

The smaller of the two numbers

MAX

#define MAX	(		a,
			b )

Value:

(((a) > (b)) ? (a) : (b))

Find the larger of two numbers.

Parameters

a	A number to compare
b	Another number to compare

Returns

The larger of the two numbers

ABS

#define ABS

(

a

)

Value:

(((a) < (0)) ? -(a) : (a))

Find the absolute value of a number.

Parameters

a	A number to find the absolute value of

Returns

The absolute value fo the number

IS_ARRAY

#define IS_ARRAY

(

arr

)

Value:

((void*)&(arr) == &(arr)[0])

Return the number of elements in a fixed length array. This does not work for pointers.

See https://stackoverflow.com/a/19455169

Parameters

arr	An array to find the number of elements in

Returns

The the number of elements in an array (not the byte size!) Helper macro to determine the number of elements in an array. Should not be used directly

STATIC_EXP

#define STATIC_EXP

(

e

)

Value:

(0 * sizeof(struct { int ARRAY_SIZE_FAILED : (2 * (e) - 1); }))

Helper macro to determine the number of elements in an array. Should not be used directly.

ARRAY_SIZE

#define ARRAY_SIZE

(

arr

)

Value:

(sizeof(arr) / sizeof((arr)[0]) + STATIC_EXP(IS_ARRAY(arr)))

POS_MODULO_ADD

#define POS_MODULO_ADD	(		a,
			b,
			d )

Value:

((a + (b % d) + d) % d)

Returns (a + b) % d, but with negative values converted to equivalent positive values. The resulting value will always be in the range [0, d), assuming d > 0.

The first modulo, (b % d) will return e.g. -90 for (-270 % 360)

Parameters

a	One number to sum
b	Another number to sum
d	The number to mod the sum by

Returns

(a + b) % d

RUN_TIMER_EVERY

#define RUN_TIMER_EVERY	(		timer,
			period,
			elapsed,
			timer_code )

Value:

do                                                      \
{                                                       \
    timer += (elapsed);                                 \
    while (timer > (period))                            \
    {                                                   \
        timer -= (period);                              \
        {                                               \
            timer_code                                  \
        }                                               \
    }                                                   \
} while (0)

Run timer_code every period, using tracking it with timer.

Parameters

timer	The accumulator variable, must persist between calls
period	The period at which timer_code should be run
elapsed	The time elapsed since this was last called
timer_code	The code to execute every period

NUM_FRAME_TIMES

#define NUM_FRAME_TIMES   60

DRAW_FPS_COUNTER

#define DRAW_FPS_COUNTER

(

font

)

Value:

do                                                                        \
{                                                                         \
    static uint32_t frameTimesIdx               = 0;                      \
    static uint32_t frameTimes[NUM_FRAME_TIMES] = {0};                    \
                                                                          \
    int32_t startIdx  = (frameTimesIdx + 1) % NUM_FRAME_TIMES;            \
    uint32_t tElapsed = frameTimes[frameTimesIdx] - frameTimes[startIdx]; \
    if (0 != tElapsed)                                                    \
    {                                                                     \
        uint32_t fps = (1000000 * NUM_FRAME_TIMES) / tElapsed;            \
        char tmp[16];                                                     \
        snprintf(tmp, sizeof(tmp) - 1, "%" PRIu32, fps);                  \
        fillDisplayArea(0, 114, 17, 116 + font.height, c000);             \
        drawText(&font, c555, tmp, 1, 115);                               \
    }                                                                     \
    frameTimesIdx             = (frameTimesIdx + 1) % NUM_FRAME_TIMES;    \
    frameTimes[frameTimesIdx] = esp_timer_get_time();                     \
} while (0)