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0862a3c512
Those macros are all about convenience. However, always using 64 bit makes casts
nececcary that goes against the idea of having a convenience macro.
E.g. when printing a frequency in KHZ one might want to do
printf("freq: %lu kHz\n", freq / KHZ(1));
leads to an error
> error: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'long long unsigned int'
Now we would have to cast - `%llu` is not available with newlib-nano and wholly
uneccecary.
Only use 64 bit artithmetic where necessary (GHZ, GiB), not for smaller units.
62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
/*
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* Copyright (C) 2020 ML!PA Consulting GmbH
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup core_macros
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* @{
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*
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* @file
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* @brief Unit helper macros
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*
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* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
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*/
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#ifndef MACROS_UNITS_H
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#define MACROS_UNITS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief A macro to return the bytes in x KiB
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*/
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#define KiB(x) ((unsigned long)(x) << 10)
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/**
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* @brief A macro to return the bytes in x MiB
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*/
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#define MiB(x) (KiB(x) << 10)
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/**
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* @brief A macro to return the bytes in x GiB
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*/
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#define GiB(x) ((unsigned long long)MiB(x) << 10)
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/**
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* @brief A macro to return the Hz in x kHz
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*/
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#define KHZ(x) ((x) * 1000UL)
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/**
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* @brief A macro to return the Hz in x MHz
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*/
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#define MHZ(x) (KHZ(x) * 1000UL)
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/**
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* @brief A macro to return the Hz in x GHz
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*/
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#define GHZ(x) (MHZ(x) * 1000ULL)
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#ifdef __cplusplus
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}
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#endif
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#endif /* MACROS_UNITS_H */
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/** @} */
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