light_ctl_utils.h

/* Copyright (c) 2010 - 2020, Nordic Semiconductor ASA
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 * such product, must reproduce the above copyright notice, this list of
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 * software without specific prior written permission.
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 * 4. This software, with or without modification, must only be used with a
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#ifndef LIGHT_CTL_UTILS_H__
#define LIGHT_CTL_UTILS_H__
#include <stdint.h>

#include "nordic_common.h"

#define T32_SCALE_FACTOR (65535LL)

#define SCALE_DOWN(_input, _scale_factor) ((_input)/(_scale_factor))

#define SCALE_UP(_input, _scale_factor) ((_input)*(_scale_factor))

static inline uint16_t light_ctl_utils_temperature32_to_temperature(uint32_t temperature32)
{
 return ((uint32_t)SCALE_DOWN(temperature32, T32_SCALE_FACTOR));
}

static inline uint32_t light_ctl_utils_temperature_to_temperature32(uint16_t temperature)
{
 return SCALE_UP((uint32_t)temperature, T32_SCALE_FACTOR);
}

static inline uint32_t light_ctl_utils_level_to_temperature32(int16_t level, uint32_t t32_min,
 uint32_t t32_max)
{
 return (t32_min + SCALE_DOWN((uint64_t) (level + 32768) * (uint64_t)(t32_max - t32_min), T32_SCALE_FACTOR));
}

static inline int16_t light_ctl_utils_temperature32_to_level(uint32_t temperature32, uint32_t t32_min,
 uint32_t t32_max)
{
 if (t32_max == t32_min)
 {
 return 0;
 }

 return ((SCALE_UP((uint64_t)(temperature32 - t32_min), T32_SCALE_FACTOR)/(t32_max - t32_min)) - 32768);
}

static inline int32_t light_ctl_utils_level_delta_to_temperature_delta(int32_t generic_level_delta,
 uint16_t t_min, uint16_t t_max)
{
 return (generic_level_delta * ((int32_t)t_max - (int32_t)t_min))/65535L;
}

static inline uint32_t light_ctl_utils_temperature32_range_restrict(uint32_t temperature32,
 uint32_t t32_min, uint32_t t32_max)
{
 /* 6.1.3.1.3 binding with CTL temperature range state */
 return MAX(t32_min, MIN(t32_max, temperature32));
}
#endif /* LIGHT_CTL_UTILS_H__ */