| /* 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 2191 2010-11-05 13:45:57Z arcanum $ */ |
| |
| #if !defined(__AVR_TINY__) |
| |
| #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__ */ |
| |
| #endif /* !defined(__AVR_TINY__) */ |