avr-libc: xmega.h Source File

avr-libc 2.0.0 Standard C library for AVR-GCC |

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xmega.h
1 /* Copyright (c) 2012 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: xmega.h 2500 2016-02-05 06:01:20Z pitchumani $ */
32
33 /*
34 * This file is included by <avr/io.h> whenever compiling for an Xmega
35 * device. It abstracts certain features common to the Xmega device
36 * families.
37 */
38
39 #ifndef _AVR_XMEGA_H
40 #define _AVR_XMEGA_H
41
42 #ifdef __DOXYGEN__
43 /**
44 \def _PROTECTED_WRITE
45 \ingroup avr_io
46
47 Write value \c value to IO register \c reg that is protected through
48 the Xmega configuration change protection (CCP) mechanism. This
49 implements the timed sequence that is required for CCP.
50
51 Example to modify the CPU clock:
52 \code
53 #include <avr/io.h>
54
55 _PROTECTED_WRITE(CLK_PSCTRL, CLK_PSADIV0_bm);
56 _PROTECTED_WRITE(CLK_CTRL, CLK_SCLKSEL0_bm);
57 \endcode
58 */
59 #define _PROTECTED_WRITE(reg, value)
60 #else /* !__DOXYGEN__ */
61 #define _PROTECTED_WRITE(reg, value) \
62 __asm__ __volatile__("out %[ccp], %[ccp_ioreg]" "\n\t" \
63 "sts %[ioreg], %[val]" \
64 : \
65 : [ccp] "I" (_SFR_IO_ADDR(CCP)), \
66 [ccp_ioreg] "d" ((uint8_t)CCP_IOREG_gc), \
67 [ioreg] "n" (_SFR_MEM_ADDR(reg)), \
68 [val] "r" ((uint8_t)value))
69 #endif /* DOXYGEN */
70
71 #endif /* _AVR_XMEGA_H */