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/* Copyright (c) 2002, Marek Michalkiewicz
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Copyright (c) 2005, Bjoern Haase
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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Created by Marek Michalkiewicz <marekm@linux.org.pl>
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eeprom_write_word and eeprom_write_block added by Artur Lipowski
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Complete rewrite using the original interface by Bjoern Haase
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<bjoern.haase@de.bosch.com>.
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#ifndef __EEPROM_REG_LOCATIONS__
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/* 6-byte string denoting where to find the EEPROM registers in memory space.
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Adresses denoted in hex syntax with uppercase letters. Used by the EEPROM
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First two letters: EECR address.
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Second two letters: EEDR address.
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Last two letters: EEAR address. */
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#define __EEPROM_REG_LOCATIONS__ 1C1D1E
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/* As long as we don't have a proper multilib environment: Let's make it
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possible to override the locations defined in the io headers. */
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#ifdef EEPROM_REG_LOCATIONS_OVERRIDE
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#undef __EEPROM_REG_LOCATIONS__
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#define __EEPROM_REG_LOCATIONS__ EEPROM_REG_LOCATIONS_OVERRIDE
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#define HEXNR CONCAT1(0x , EEPROM_REG_LOCATIONS_OVERRIDE)
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#define EECR _SFR_IO8((HEXNR >> 16) & 0xFF)
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#define EEDR _SFR_IO8((HEXNR >> 8) & 0xFF )
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#define EEAR _SFR_IO8(HEXNR & 0xFF)
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#define _EELABEL(x) CONCAT1(__,CONCAT1(x, CONCAT1 (_,__EEPROM_REG_LOCATIONS__)))
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/* the same library is used for 2313 and 8515 for now -
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I hope writing 0 to non-existent EEARH doesn't hurt... */
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#define EEARH (EEARL+1)
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#ifdef L_eeprom_read_byte
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/* read one byte from EEPROM.
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addr = r26:r27, result = __tmp_reg__
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Post increment r26:r27. */
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.section .text.eeprom, "ax", @progbits
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.global _EELABEL(eeprom_read_byte)
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_EELABEL(eeprom_read_byte):
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sbic _SFR_IO_ADDR(EECR), EEWE
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rjmp _EELABEL(eeprom_read_byte) /* make sure EEPROM is ready */
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out _SFR_IO_ADDR(EEARH),r27
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out _SFR_IO_ADDR(EEARL),r26
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sbi _SFR_IO_ADDR(EECR), EERE
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adiw r26,1 /* Increment x register */
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in __tmp_reg__, _SFR_IO_ADDR(EEDR)
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#endif /* L_eeprom_read_byte */
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#ifdef L_eeprom_read_word
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/* read one word from EEPROM.
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addr = r26:r27, result = r30:r31
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Post increment r26:r27. */
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.section .text.eeprom, "ax", @progbits
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.global _EELABEL(eeprom_read_word)
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_EELABEL(eeprom_read_word):
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rcall _EELABEL(eeprom_read_byte)
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rcall _EELABEL(eeprom_read_byte)
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#ifdef L_eeprom_write_byte
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/* write a byte to EEPROM
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Address in r26:r27, value in __tmp_reg__
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Post increment r26:r27. */
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.section .text.eeprom, "ax", @progbits
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.global _EELABEL(eeprom_write_byte)
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_EELABEL(eeprom_write_byte):
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sbic _SFR_IO_ADDR(EECR), EEWE
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rjmp _EELABEL(eeprom_write_byte) /* make sure EEPROM is ready */
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out _SFR_IO_ADDR(EEARH), r27
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out _SFR_IO_ADDR(EEARL), r26
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out _SFR_IO_ADDR(EEDR),__tmp_reg__
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adiw r26,1 /* Increment x register */
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in __tmp_reg__, _SFR_IO_ADDR(SREG)
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cli ; /* no ints between setting EEMWE and EEWE */
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sbi _SFR_IO_ADDR(EECR), EEMWE
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sbi _SFR_IO_ADDR(EECR), EEWE
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out _SFR_IO_ADDR(SREG), __tmp_reg__
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#endif /* L_eeprom_write_byte */
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#ifdef L_eeprom_write_word
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/* write a word to EEPROM
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Address in r26:r27, value in __tmp_reg__ (LSB) and __zero_reg__ (MSB)
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Post increment r26:r27. */
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.section .text.eeprom, "ax", @progbits
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.global _EELABEL(eeprom_write_word)
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_EELABEL(eeprom_write_word):
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rcall _EELABEL(eeprom_write_byte)
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mov __tmp_reg__,__zero_reg__
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rcall _EELABEL(eeprom_write_byte)
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#ifdef L_eeprom_read_block
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/* read a block of n (maximum 256) bytes from EEPROM
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ram_buffer = r30:r31, eeprom_addr = r26:r27, n = __zero_reg__
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an initial value of 0 in __zero_reg__ corresponds to a value of n == 256. */
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.section .text.eeprom, "ax", @progbits
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.global _EELABEL(eeprom_read_block)
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.global _EELABEL(eeprom_read_byte)
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_EELABEL(eeprom_read_block):
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rcall _EELABEL(eeprom_read_byte)
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brne _EELABEL(eeprom_read_block)
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#endif /* L_eeprom_read_block */
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#ifdef L_eeprom_write_block
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/* Write a block of n (maximum 256) bytes to EEPROM
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ram_pointer = r30:r31, eeprom_addr = r26:r27, n = __zero_reg__
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an initial value of 0 in __zero_reg__ correspond to a value of n == 256. */
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.section .text.eeprom, "ax", @progbits
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.global _EELABEL(eeprom_write_block)
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.global _EELABEL(eeprom_write_byte)
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_EELABEL(eeprom_write_block):
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rcall _EELABEL(eeprom_write_byte)
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brne _EELABEL(eeprom_write_block)
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#endif /* L_eeprom_write_block */
added
removed
libc/misc/eeprom.S
