1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/* Copyright (c) 2009 Dmitry Xmelkov
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE. */
/* $Id: eeupd_byte.S,v 1.1.2.2 2009/06/20 07:21:20 dmix Exp $ */
#ifndef __DOXYGEN
#include <avr/io.h>
#if E2END && __AVR_ARCH__ > 1
#include <avr/eeprom.h>
#include "asmdef.h"
#include "eedef.h"
/* void eeprom_update_byte (unsigned char *eepr, unsigned char val)
void eeprom_update_r18 (unsigned char *eepr, r18)
*/
ENTRY eeprom_update_byte
mov r18, r22
ENTRY eeprom_update_r18
#if __AVR_XMEGA__
XCALL eeprom_mapen
ld __tmp_reg__, Z
cp __tmp_reg__, r18
breq 1f
XCALL eeprom_write_r18
sbiw addr_lo, 1 ; restore initial value
1: sbiw addr_lo, 1
ret
#else
1: sbic _SFR_IO_ADDR (EECR), EEWE
rjmp 1b
# ifdef EEARH
# if E2END > 0xFF
out _SFR_IO_ADDR (EEARH), addr_hi
# else
; This is for chips like ATmega48: the EEAR8 bit must be cleaned.
out _SFR_IO_ADDR (EEARH), __zero_reg__
# endif
# endif
out _SFR_IO_ADDR (EEARL), addr_lo
sbi _SFR_IO_ADDR (EECR), EERE
# if E2END > 0xFF
sbiw addr_lo, 1
# else
subi addr_lo, 1
# endif
in __tmp_reg__, _SFR_IO_ADDR (EEDR)
cp __tmp_reg__, r18
breq 2f
# if defined (EEPM0) && defined (EEPM1)
; Set programming mode: erase and write.
out _SFR_IO_ADDR (EECR), __zero_reg__
# elif defined (EEPM0) || defined (EEPM1)
# error /* Unknown EECR register. */
# endif
out _SFR_IO_ADDR (EEDR), r18
in __tmp_reg__, _SFR_IO_ADDR (SREG)
cli
sbi _SFR_IO_ADDR (EECR), EEMWE
sbi _SFR_IO_ADDR (EECR), EEWE
out _SFR_IO_ADDR (SREG), __tmp_reg__
2: ret
#endif /* !__AVR_XMEGA__ */
ENDFUNC
#endif /* E2END && __AVR_ARCH__ > 1 */
#endif /* !__DOXYGEN__ */
|
