58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
#ifndef _MODULES_MACROS_H
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#define _MODULES_MACROS_H
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#include <stdint.h>
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// Padding is just empty space, we don't want to give it a type. There's also
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// some subtle preprocessor trick to automatically add a (supposedly) unique
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// name to each padding member. For instance the substitution may operate as:
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// name(__LINE__) -> namesub(78) -> _##78 -> _78
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#define namesub(x) _##x
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#define name(x) namesub(x)
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#define pad(bytes) \
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uint8_t name(__LINE__)[bytes]
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// Fixed-width types for bit field are totally meaningless.
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typedef unsigned uint;
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/*
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byte_union()
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Union between an uint8_t 'byte' attribute and a provided bit-field
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structure that describe the contents of the byte.
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*/
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#define byte_union(name, fields) \
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union \
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{ \
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uint8_t byte; \
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struct { fields } \
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__attribute__((packed)); \
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} __attribute__((packed)) name
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/*
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word_union()
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Union between an uint16_t 'word' attribute and a provided bit-field
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structure that describe the contents of the word.
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*/
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#define word_union(name, fields) \
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union \
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{ \
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uint16_t word; \
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struct { fields } \
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__attribute__((packed)); \
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} __attribute__((packed, aligned(2))) name
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/*
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lword_union()
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Union between an uint32_t 'lword' attribute and a provided bit-field
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structure that describe the contents of the longword.
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*/
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#define lword_union(name, fields) \
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union \
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{ \
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uint32_t lword; \
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struct { fields } \
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__attribute__((packed)); \
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} __attribute__((packed, aligned(4))) name
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#endif // _MODULES_MACROS_H
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