1/* Copyright (c) 2009  Dmitry Xmelkov
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   * Redistributions in binary form must reproduce the above copyright
10     notice, this list of conditions and the following disclaimer in
11     the documentation and/or other materials provided with the
12     distribution.
13   * Neither the name of the copyright holders nor the names of
14     contributors may be used to endorse or promote products derived
15     from this software without specific prior written permission.
16
17   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27   POSSIBILITY OF SUCH DAMAGE.	*/
28
29/* $Id: eeupd_block.S 1979 2009-06-05 23:08:14Z dmix $	*/
30
31#ifndef	__DOXYGEN__
32
33#include <avr/io.h>
34
35#if	E2END && __AVR_ARCH__ > 1
36
37#include <avr/eeprom.h>
38#include "asmdef.h"
39#include "eedef.h"
40
41/* void eeprom_update_block (const void *sram, void *eepr, size_t n)
42 */
43
44#define	sram_lo	r24
45#define	eepr_lo	r22
46
47ENTRY	eeprom_update_block
48
49#if	RAMEND > 0xFF  ||  E2END > 0xFF
50	X_movw	XL, sram_lo
51	add	XL, n_lo
52	adc	XH, n_hi
53	subi	n_lo, lo8(1)
54	sbci	n_hi, hi8(1)
55#else
56	mov	XL, sram_lo
57	add	XL, n_lo
58	subi	n_lo, lo8(1)
59#endif
60	brlo	3f
61
62#if	E2END > 0xFF
63	X_movw	addr_lo, eepr_lo
64	add	addr_lo, n_lo
65	adc	addr_hi, n_hi
66#else
67	mov	addr_lo, eepr_lo
68	add	addr_lo, n_lo
69#endif
70
711:	ld	r18, -X
72	XCALL	eeprom_update_r18
732:	subi	n_lo, lo8(1)
74
75#if	RAMEND > 0xFF  ||  E2END > 0xFF
76	sbci	n_hi, hi8(1)
77#endif
78
79	brsh	1b
803:	ret
81
82ENDFUNC
83
84#endif	/* E2END && __AVR_ARCH__ > 1 */
85#endif	/* !__DOXYGEN__ */
86