knx/datapoint_types.h

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2018-04-09 22:30:23 +02:00
/*
* datapoint_types.h - Conversion functions for datapoint types.
*
* Copyright (c) 2014 Stefan Taferner <stefan.taferner@gmx.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*/
#pragma once
#include <stdint.h>
/**
* An invalid 2 uint8_t float (DPT9/EIS5).
* To be used for dptToFloat() and dptFromFloat().
*/
#define INVALID_DPT_FLOAT 2147483647U
/**
* Convert a value from uint32_t to 2 uint8_t float (DPT9/EIS5). The possible range
* of the values is -67108864 to 67076096.
*
* @param value - the value to convert.
* Use INVALID_DPT_FLOAT for the DPT9 "invalid data" value.
* @return The 2 uint8_t float (DPT9/EIS5).
*/
uint16_t dptToFloat(int32_t value);
/**
* Convert a value from 2 uint8_t float (DPT9/EIS5) to integer.
*
* @param dptValue - the 2 uint8_t float (DPT9/EIS5) to convert
* @return The value as integer, or INVALID_DPT_FLOAT for the
* DPT9 "invalid data" value.
*/
int32_t dptFromFloat(uint16_t dptValue);