AVR-LibC
2.2.0
Standard C library for AVR-GCC
AVR-LibC Documentation
AVR-LibC Development Pages
Main Page
User Manual
Library Reference
FAQ
Example Projects
File List
Loading...
Searching...
No Matches
include
avr
cpufunc.h
Go to the documentation of this file.
1
/* Copyright (c) 2010, Joerg Wunsch
2
All rights reserved.
3
4
Redistribution and use in source and binary forms, with or without
5
modification, are permitted provided that the following conditions are met:
6
7
* Redistributions of source code must retain the above copyright
8
notice, this list of conditions and the following disclaimer.
9
10
* Redistributions in binary form must reproduce the above copyright
11
notice, this list of conditions and the following disclaimer in
12
the documentation and/or other materials provided with the
13
distribution.
14
15
* Neither the name of the copyright holders nor the names of
16
contributors may be used to endorse or promote products derived
17
from this software without specific prior written permission.
18
19
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29
POSSIBILITY OF SUCH DAMAGE. */
30
31
/* $Id$ */
32
33
/* avr/cpufunc.h - Special CPU functions */
34
35
#ifndef _AVR_CPUFUNC_H_
36
#define _AVR_CPUFUNC_H_ 1
37
38
#include <
stdint.h
>
39
40
/** \file */
41
/** \defgroup avr_cpufunc <avr/cpufunc.h>: Special AVR CPU functions
42
\code #include <avr/cpufunc.h> \endcode
43
44
This header file contains macros that access special functions of
45
the AVR CPU which do not fit into any of the other header files.
46
47
*/
48
49
#if defined(__DOXYGEN__)
50
/**
51
\ingroup avr_cpufunc
52
\def _NOP
53
54
Execute a <i>no operation</i> (NOP) CPU instruction. This
55
should not be used to implement delays, better use the functions
56
from <util/delay_basic.h> or <util/delay.h> for this. For
57
debugging purposes, a NOP can be useful to have an instruction that
58
is guaranteed to be not optimized away by the compiler, so it can
59
always become a breakpoint in the debugger.
60
*/
61
#define _NOP()
62
#else
/* real code */
63
#define _NOP() __asm__ __volatile__("nop"
)
64
#endif
/* __DOXYGEN__ */
65
66
#if defined(__DOXYGEN__)
67
/**
68
\ingroup avr_cpufunc
69
\def _MemoryBarrier
70
71
Implement a read/write <i>memory barrier</i>. A memory
72
barrier instructs the compiler to not cache any memory data in
73
registers beyond the barrier. This can sometimes be more effective
74
than blocking certain optimizations by declaring some object with a
75
\c volatile qualifier.
76
77
See \ref optim_code_reorder for things to be taken into account
78
with respect to compiler optimizations.
79
*/
80
#define _MemoryBarrier()
81
#else
/* real code */
82
#define _MemoryBarrier() __asm__ __volatile__(""
:::"memory")
83
#endif
/* __DOXYGEN__ */
84
85
#ifdef __cplusplus
86
extern
"C"
{
87
#endif
88
89
/**
90
\ingroup avr_cpufunc
91
92
Write \a __value to IO Register Protected (CCP) IO register
93
at \a __ioaddr. . See also \c _PROTECTED_WRITE(). */
94
void
ccp_write_io
(
volatile
uint8_t
*__ioaddr,
uint8_t
__value);
95
96
/**
97
\ingroup avr_cpufunc
98
99
Write \a __value to SPM Instruction Protected (CCP) IO register
100
at \a __ioaddr. See also \c _PROTECTED_WRITE_SPM(). */
101
void
ccp_write_spm
(
volatile
uint8_t
*__ioaddr,
uint8_t
__value);
102
103
#ifdef __cplusplus
104
}
105
#endif
106
107
#endif
/* _AVR_CPUFUNC_H_ */
ccp_write_spm
void ccp_write_spm(volatile uint8_t *__ioaddr, uint8_t __value)
ccp_write_io
void ccp_write_io(volatile uint8_t *__ioaddr, uint8_t __value)
uint8_t
unsigned char uint8_t
Definition:
stdint.h:83
stdint.h
Generated on Sun Jun 9 2024 00:30:41 for AVR-LibC by
1.9.6