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37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/*
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* datapoint_types.h - Conversion functions for datapoint types.
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*
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* Copyright (c) 2014 Stefan Taferner <stefan.taferner@gmx.at>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*/
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#pragma once
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#include <stdint.h>
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/**
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* An invalid 2 uint8_t float (DPT9/EIS5).
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* To be used for dptToFloat() and dptFromFloat().
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*/
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#define INVALID_DPT_FLOAT 2147483647U
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/**
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* Convert a value from uint32_t to 2 uint8_t float (DPT9/EIS5). The possible range
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* of the values is -67108864 to 67076096.
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*
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* @param value - the value to convert.
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* Use INVALID_DPT_FLOAT for the DPT9 "invalid data" value.
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* @return The 2 uint8_t float (DPT9/EIS5).
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*/
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uint16_t dptToFloat(int32_t value);
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/**
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* Convert a value from 2 uint8_t float (DPT9/EIS5) to integer.
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*
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* @param dptValue - the 2 uint8_t float (DPT9/EIS5) to convert
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* @return The value as integer, or INVALID_DPT_FLOAT for the
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* DPT9 "invalid data" value.
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*/
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int32_t dptFromFloat(uint16_t dptValue); |