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Genesis-Plus-GX/core/cart_hw/eeprom_i2c.c

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/****************************************************************************
* Genesis Plus
* I2C Serial EEPROM (24Cxx) support
*
* Copyright (C) 2007-2013 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions 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.
*
* 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.
*
****************************************************************************************/
#include "shared.h"
#define GAME_CNT 28
/* this defines the type of EEPROM inside the game cartridge as Backup RAM
*
* Here are some notes from 8BitWizard (http://www.spritesmind.net/_GenDev/forum):
*
* Mode 1 (7-bit) - the chip takes a single byte with a 7-bit memory address and a R/W bit (24C01)
* Mode 2 (8-bit) - the chip takes a 7-bit device address and R/W bit followed by an 8-bit memory address;
* the device address may contain up to three more memory address bits (24C01 - 24C16).
* You can also string eight 24C01, four 24C02, two 24C08, or various combinations, set their address config lines correctly,
* and the result appears exactly the same as a 24C16
* Mode 3 (16-bit) - the chip takes a 7-bit device address and R/W bit followed by a 16-bit memory address (24C32 and larger)
*
* Also, while most 24Cxx are addressed at 200000-2FFFFF, I have found two different ways of mapping the control lines.
* EA uses SDA on D7 (read/write) and SCL on D6 (write only), and I have found boards using different mapping (I think Accolade)
* which uses D1-read=SDA, D0-write=SDA, D1-write=SCL. Accolade also has a custom-chip mapper which may even use a third method.
*/
typedef struct
{
uint8 address_bits; /* number of bits needed to address memory: 7, 8 or 16 */
uint16 size_mask; /* depends on the max size of the memory (in bytes) */
uint16 pagewrite_mask; /* depends on the maximal number of bytes that can be written in a single write cycle */
uint32 sda_in_adr; /* 68000 memory address mapped to SDA_IN */
uint32 sda_out_adr; /* 68000 memory address mapped to SDA_OUT */
uint32 scl_adr; /* 68000 memory address mapped to SCL */
uint8 sda_in_bit; /* bit offset for SDA_IN */
uint8 sda_out_bit; /* bit offset for SDA_OUT */
uint8 scl_bit; /* bit offset for SCL */
} T_CONFIG_I2C;
typedef enum
{
STAND_BY = 0,
WAIT_STOP,
GET_SLAVE_ADR,
GET_WORD_ADR_7BITS,
GET_WORD_ADR_HIGH,
GET_WORD_ADR_LOW,
WRITE_DATA,
READ_DATA
} T_STATE_I2C;
typedef struct
{
uint8 sda; /* current /SDA line state */
uint8 scl; /* current /SCL line state */
uint8 old_sda; /* previous /SDA line state */
uint8 old_scl; /* previous /SCL line state */
uint8 cycles; /* current operation cycle number (0-9) */
uint8 rw; /* operation type (1:READ, 0:WRITE) */
uint16 slave_mask; /* device address (shifted by the memory address width)*/
uint16 word_address; /* memory address */
T_STATE_I2C state; /* current operation state */
T_CONFIG_I2C config; /* EEPROM characteristics for this game */
} T_EEPROM_I2C;
typedef struct
{
char game_id[16];
uint16 chk;
T_CONFIG_I2C config;
} T_GAME_ENTRY;
static const T_GAME_ENTRY database[GAME_CNT] =
{
/* ACCLAIM mappers */
/* 24C02 (old mapper) */
{{"T-081326" }, 0, {8, 0xFF, 0xFF, 0x200001, 0x200001, 0x200001, 0, 1, 1}}, /* NBA Jam (UE) */
{{"T-81033" }, 0, {8, 0xFF, 0xFF, 0x200001, 0x200001, 0x200001, 0, 1, 1}}, /* NBA Jam (J) */
/* 24C02 */
{{"T-081276" }, 0, {8, 0xFF, 0xFF, 0x200001, 0x200001, 0x200000, 0, 0, 0}}, /* NFL Quarterback Club */
/* 24C04 */
{{"T-81406" }, 0, {8, 0x1FF, 0x1FF, 0x200001, 0x200001, 0x200000, 0, 0, 0}}, /* NBA Jam TE */
/* 24C16 */
{{"T-081586" }, 0, {8, 0x7FF, 0x7FF, 0x200001, 0x200001, 0x200000, 0, 0, 0}}, /* NFL Quarterback Club '96 */
/* 24C65 */
{{"T-81576" }, 0, {16, 0x1FFF, 0x1FFF, 0x200001, 0x200001, 0x200000, 0, 0, 0}}, /* College Slam */
{{"T-81476" }, 0, {16, 0x1FFF, 0x1FFF, 0x200001, 0x200001, 0x200000, 0, 0, 0}}, /* Frank Thomas Big Hurt Baseball */
/* EA mapper (X24C01 only) */
{{"T-50176" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 7, 7, 6}}, /* Rings of Power */
{{"T-50396" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 7, 7, 6}}, /* NHLPA Hockey 93 */
{{"T-50446" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 7, 7, 6}}, /* John Madden Football 93 */
{{"T-50516" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 7, 7, 6}}, /* John Madden Football 93 (Championship Ed.) */
{{"T-50606" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 7, 7, 6}}, /* Bill Walsh College Football */
/* SEGA mapper (X24C01 only) */
{{"T-12046" }, 0xAD23, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Megaman - The Wily Wars */
{{"T-12053" }, 0xEA80, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Rockman Mega World [Alt] */
{{"MK-1215" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Evander 'Real Deal' Holyfield's Boxing */
{{"MK-1228" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Greatest Heavyweights of the Ring (U) */
{{"G-5538" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Greatest Heavyweights of the Ring (J) */
{{"PR-1993" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Greatest Heavyweights of the Ring (E) */
{{"G-4060" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Wonderboy in Monster World */
{{"00001211-00"}, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Sports Talk Baseball */
{{"00004076-00"}, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Honoo no Toukyuuji Dodge Danpei */
{{"G-4524" }, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Ninja Burai Densetsu */
{{"00054503-00"}, 0, {7, 0x7F, 0x7F, 0x200001, 0x200001, 0x200001, 0, 0, 1}}, /* Game Toshokan */
/* CODEMASTERS mapper */
/* 24C08 */
{{"T-120106" }, 0, {8, 0x3FF, 0x3FF, 0x300000, 0x380001, 0x300000, 0, 7, 1}}, /* Brian Lara Cricket */
{{"00000000-00"}, 0xCEE0, {8, 0x3FF, 0x3FF, 0x300000, 0x380001, 0x300000, 0, 7, 1}}, /* Micro Machines Military */
/* 24C16 */
{{"T-120096" }, 0, {8, 0x7FF, 0x7FF, 0x300000, 0x380001, 0x300000, 0, 7, 1}}, /* Micro Machines 2 - Turbo Tournament */
{{"00000000-00"}, 0x2C41, {8, 0x7FF, 0x7FF, 0x300000, 0x380001, 0x300000, 0, 7, 1}}, /* Micro Machines Turbo Tournament 96 */
/* 24C65 */
{{"T-120146-50"}, 0, {16, 0x1FFF, 0x1FFF, 0x300000, 0x380001, 0x300000, 0, 7, 1}} /* Brian Lara Cricket 96, Shane Warne Cricket */
};
static T_EEPROM_I2C eeprom_i2c;
static unsigned int eeprom_i2c_read_byte(unsigned int address);
static unsigned int eeprom_i2c_read_word(unsigned int address);
static void eeprom_i2c_write_byte(unsigned int address, unsigned int data);
static void eeprom_i2c_write_word(unsigned int address, unsigned int data);
void eeprom_i2c_init()
{
int i = 0;
/* initialize eeprom */
memset(&eeprom_i2c, 0, sizeof(T_EEPROM_I2C));
eeprom_i2c.sda = eeprom_i2c.old_sda = 1;
eeprom_i2c.scl = eeprom_i2c.old_scl = 1;
eeprom_i2c.state = STAND_BY;
/* no eeprom by default */
sram.custom = 0;
/* look into game database */
while (i<GAME_CNT)
{
if (strstr(rominfo.product,database[i].game_id) != NULL)
{
/* additional check (Micro Machines, Rockman Mega World) */
if ((database[i].chk == 0x0000) || (database[i].chk == rominfo.realchecksum))
{
sram.custom = 1;
sram.on = 1;
memcpy(&eeprom_i2c.config, &database[i].config, sizeof(T_CONFIG_I2C));
i = GAME_CNT;
}
}
i++;
}
/* Game not found in database but ROM header indicates it uses serial EEPROM */
if (!sram.custom && sram.detected)
{
if ((READ_BYTE(cart.rom,0x1b2) == 0xe8) || ((sram.end - sram.start) < 2))
{
/* set SEGA mapper as default */
sram.custom = 1;
memcpy(&eeprom_i2c.config, &database[9].config, sizeof(T_CONFIG_I2C));
}
}
/* initialize m68k bus handlers */
if (sram.custom)
{
m68k.memory_map[eeprom_i2c.config.sda_out_adr >> 16].read8 = eeprom_i2c_read_byte;
m68k.memory_map[eeprom_i2c.config.sda_out_adr >> 16].read16 = eeprom_i2c_read_word;
m68k.memory_map[eeprom_i2c.config.sda_in_adr >> 16].read8 = eeprom_i2c_read_byte;
m68k.memory_map[eeprom_i2c.config.sda_in_adr >> 16].read16 = eeprom_i2c_read_word;
m68k.memory_map[eeprom_i2c.config.scl_adr >> 16].write8 = eeprom_i2c_write_byte;
m68k.memory_map[eeprom_i2c.config.scl_adr >> 16].write16 = eeprom_i2c_write_word;
zbank_memory_map[eeprom_i2c.config.sda_out_adr >> 16].read = eeprom_i2c_read_byte;
zbank_memory_map[eeprom_i2c.config.sda_in_adr >> 16].read = eeprom_i2c_read_byte;
zbank_memory_map[eeprom_i2c.config.scl_adr >> 16].write = eeprom_i2c_write_byte;
}
}
INLINE void Detect_START()
{
if (eeprom_i2c.old_scl && eeprom_i2c.scl)
{
if (eeprom_i2c.old_sda && !eeprom_i2c.sda)
{
eeprom_i2c.cycles = 0;
eeprom_i2c.slave_mask = 0;
if (eeprom_i2c.config.address_bits == 7)
{
eeprom_i2c.word_address = 0;
eeprom_i2c.state = GET_WORD_ADR_7BITS;
}
else eeprom_i2c.state = GET_SLAVE_ADR;
}
}
}
INLINE void Detect_STOP()
{
if (eeprom_i2c.old_scl && eeprom_i2c.scl)
{
if (!eeprom_i2c.old_sda && eeprom_i2c.sda)
{
eeprom_i2c.state = STAND_BY;
}
}
}
static void eeprom_i2c_update(void)
{
/* EEPROM current state */
switch (eeprom_i2c.state)
{
/* Standby Mode */
case STAND_BY:
{
Detect_START();
Detect_STOP();
break;
}
/* Suspended Mode */
case WAIT_STOP:
{
Detect_STOP();
break;
}
/* Get Word Address 7 bits: MODE-1 only (24C01)
* and R/W bit
*/
case GET_WORD_ADR_7BITS:
{
Detect_START();
Detect_STOP();
/* look for SCL LOW to HIGH transition */
if (!eeprom_i2c.old_scl && eeprom_i2c.scl)
{
if (eeprom_i2c.cycles == 0) eeprom_i2c.cycles ++;
}
/* look for SCL HIGH to LOW transition */
if (eeprom_i2c.old_scl && !eeprom_i2c.scl && (eeprom_i2c.cycles > 0))
{
if (eeprom_i2c.cycles < 8)
{
eeprom_i2c.word_address |= (eeprom_i2c.old_sda << (7 - eeprom_i2c.cycles));
}
else if (eeprom_i2c.cycles == 8)
{
eeprom_i2c.rw = eeprom_i2c.old_sda;
}
else
{ /* ACK CYCLE */
eeprom_i2c.cycles = 0;
eeprom_i2c.word_address &= eeprom_i2c.config.size_mask;
eeprom_i2c.state = eeprom_i2c.rw ? READ_DATA : WRITE_DATA;
}
eeprom_i2c.cycles ++;
}
break;
}
/* Get Slave Address (3bits) : MODE-2 & MODE-3 only (24C01 - 24C512) (0-3bits, depending on the array size)
* or/and Word Address MSB: MODE-2 only (24C04 - 24C16) (0-3bits, depending on the array size)
* and R/W bit
*/
case GET_SLAVE_ADR:
{
Detect_START();
Detect_STOP();
/* look for SCL LOW to HIGH transition */
if (!eeprom_i2c.old_scl && eeprom_i2c.scl)
{
if (eeprom_i2c.cycles == 0) eeprom_i2c.cycles ++;
}
/* look for SCL HIGH to LOW transition */
if (eeprom_i2c.old_scl && !eeprom_i2c.scl && (eeprom_i2c.cycles > 0))
{
if ((eeprom_i2c.cycles > 4) && (eeprom_i2c.cycles <8))
{
if ((eeprom_i2c.config.address_bits == 16) ||
(eeprom_i2c.config.size_mask < (1 << (15 - eeprom_i2c.cycles))))
{
/* this is a SLAVE ADDRESS bit */
eeprom_i2c.slave_mask |= (eeprom_i2c.old_sda << (7 - eeprom_i2c.cycles));
}
else
{
/* this is a WORD ADDRESS high bit */
if (eeprom_i2c.old_sda) eeprom_i2c.word_address |= (1 << (15 - eeprom_i2c.cycles));
else eeprom_i2c.word_address &= ~(1 << (15 - eeprom_i2c.cycles));
}
}
else if (eeprom_i2c.cycles == 8) eeprom_i2c.rw = eeprom_i2c.old_sda;
else if (eeprom_i2c.cycles > 8)
{
/* ACK CYCLE */
eeprom_i2c.cycles = 0;
if (eeprom_i2c.config.address_bits == 16)
{
/* two ADDRESS bytes */
eeprom_i2c.state = eeprom_i2c.rw ? READ_DATA : GET_WORD_ADR_HIGH;
eeprom_i2c.slave_mask <<= 16;
}
else
{
/* one ADDRESS byte */
eeprom_i2c.state = eeprom_i2c.rw ? READ_DATA : GET_WORD_ADR_LOW;
eeprom_i2c.slave_mask <<= 8;
}
}
eeprom_i2c.cycles ++;
}
break;
}
/* Get Word Address MSB (4-8bits depending on the array size)
* MODE-3 only (24C32 - 24C512)
*/
case GET_WORD_ADR_HIGH:
{
Detect_START();
Detect_STOP();
/* look for SCL HIGH to LOW transition */
if (eeprom_i2c.old_scl && !eeprom_i2c.scl)
{
if (eeprom_i2c.cycles < 9)
{
if ((eeprom_i2c.config.size_mask + 1) < (1 << (17 - eeprom_i2c.cycles)))
{
/* ignored bit: slave mask should be right-shifted by one */
eeprom_i2c.slave_mask >>= 1;
}
else
{
/* this is a WORD ADDRESS high bit */
if (eeprom_i2c.old_sda) eeprom_i2c.word_address |= (1 << (16 - eeprom_i2c.cycles));
else eeprom_i2c.word_address &= ~(1 << (16 - eeprom_i2c.cycles));
}
eeprom_i2c.cycles ++;
}
else
{
/* ACK CYCLE */
eeprom_i2c.cycles = 1;
eeprom_i2c.state = GET_WORD_ADR_LOW;
}
}
break;
}
/* Get Word Address LSB: 7bits (24C01) or 8bits (24C02-24C512)
* MODE-2 and MODE-3 only (24C01 - 24C512)
*/
case GET_WORD_ADR_LOW:
{
Detect_START();
Detect_STOP();
/* look for SCL HIGH to LOW transition */
if (eeprom_i2c.old_scl && !eeprom_i2c.scl)
{
if (eeprom_i2c.cycles < 9)
{
if ((eeprom_i2c.config.size_mask + 1) < (1 << (9 - eeprom_i2c.cycles)))
{
/* ignored bit (X24C01): slave mask should be right-shifted by one */
eeprom_i2c.slave_mask >>= 1;
}
else
{
/* this is a WORD ADDRESS high bit */
if (eeprom_i2c.old_sda) eeprom_i2c.word_address |= (1 << (8 - eeprom_i2c.cycles));
else eeprom_i2c.word_address &= ~(1 << (8 - eeprom_i2c.cycles));
}
eeprom_i2c.cycles ++;
}
else
{
/* ACK CYCLE */
eeprom_i2c.cycles = 1;
eeprom_i2c.word_address &= eeprom_i2c.config.size_mask;
eeprom_i2c.state = WRITE_DATA;
}
}
break;
}
/*
* Read Cycle
*/
case READ_DATA:
{
Detect_START();
Detect_STOP();
/* look for SCL HIGH to LOW transition */
if (eeprom_i2c.old_scl && !eeprom_i2c.scl)
{
if (eeprom_i2c.cycles < 9) eeprom_i2c.cycles ++;
else
{
eeprom_i2c.cycles = 1;
/* ACK not received */
if (eeprom_i2c.old_sda) eeprom_i2c.state = WAIT_STOP;
}
}
break;
}
/*
* Write Cycle
*/
case WRITE_DATA:
{
Detect_START();
Detect_STOP();
/* look for SCL HIGH to LOW transition */
if (eeprom_i2c.old_scl && !eeprom_i2c.scl)
{
if (eeprom_i2c.cycles < 9)
{
/* Write DATA bits (max 64kBytes) */
uint16 sram_address = (eeprom_i2c.slave_mask | eeprom_i2c.word_address) & 0xFFFF;
if (eeprom_i2c.old_sda) sram.sram[sram_address] |= (1 << (8 - eeprom_i2c.cycles));
else sram.sram[sram_address] &= ~(1 << (8 - eeprom_i2c.cycles));
if (eeprom_i2c.cycles == 8)
{
/* WORD ADDRESS is incremented (roll up at maximum pagesize) */
eeprom_i2c.word_address = (eeprom_i2c.word_address & (0xFFFF - eeprom_i2c.config.pagewrite_mask)) |
((eeprom_i2c.word_address + 1) & eeprom_i2c.config.pagewrite_mask);
}
eeprom_i2c.cycles ++;
}
else eeprom_i2c.cycles = 1; /* ACK cycle */
}
break;
}
}
eeprom_i2c.old_scl = eeprom_i2c.scl;
eeprom_i2c.old_sda = eeprom_i2c.sda;
}
static unsigned char eeprom_i2c_out(void)
{
uint8 sda_out = eeprom_i2c.sda;
/* EEPROM state */
switch (eeprom_i2c.state)
{
case READ_DATA:
{
if (eeprom_i2c.cycles < 9)
{
/* Return DATA bits (max 64kBytes) */
uint16 sram_address = (eeprom_i2c.slave_mask | eeprom_i2c.word_address) & 0xffff;
sda_out = (sram.sram[sram_address] >> (8 - eeprom_i2c.cycles)) & 1;
if (eeprom_i2c.cycles == 8)
{
/* WORD ADDRESS is incremented (roll up at maximum array size) */
eeprom_i2c.word_address ++;
eeprom_i2c.word_address &= eeprom_i2c.config.size_mask;
}
}
break;
}
case GET_WORD_ADR_7BITS:
case GET_SLAVE_ADR:
case GET_WORD_ADR_HIGH:
case GET_WORD_ADR_LOW:
case WRITE_DATA:
{
if (eeprom_i2c.cycles == 9) sda_out = 0;
break;
}
default:
{
break;
}
}
return (sda_out << eeprom_i2c.config.sda_out_bit);
}
static unsigned int eeprom_i2c_read_byte(unsigned int address)
{
if (address == eeprom_i2c.config.sda_out_adr)
{
return eeprom_i2c_out();
}
return READ_BYTE(cart.rom, address);
}
static unsigned int eeprom_i2c_read_word(unsigned int address)
{
if (address == eeprom_i2c.config.sda_out_adr)
{
return (eeprom_i2c_out() << 8);
}
if (address == (eeprom_i2c.config.sda_out_adr ^ 1))
{
return eeprom_i2c_out();
}
return *(uint16 *)(cart.rom + address);
}
static void eeprom_i2c_write_byte(unsigned int address, unsigned int data)
{
int do_update = 0;
if (address == eeprom_i2c.config.sda_in_adr)
{
eeprom_i2c.sda = (data >> eeprom_i2c.config.sda_in_bit) & 1;
do_update = 1;
}
if (address == eeprom_i2c.config.scl_adr)
{
eeprom_i2c.scl = (data >> eeprom_i2c.config.scl_bit) & 1;
do_update = 1;
}
if (do_update)
{
eeprom_i2c_update();
return;
}
m68k_unused_8_w(address, data);
}
static void eeprom_i2c_write_word(unsigned int address, unsigned int data)
{
int do_update = 0;
if (address == eeprom_i2c.config.sda_in_adr)
{
eeprom_i2c.sda = (data >> (8 + eeprom_i2c.config.sda_in_bit)) & 1;
do_update = 1;
}
else if (address == (eeprom_i2c.config.sda_in_adr ^1))
{
eeprom_i2c.sda = (data >> eeprom_i2c.config.sda_in_bit) & 1;
do_update = 1;
}
if (address == eeprom_i2c.config.scl_adr)
{
eeprom_i2c.scl = (data >> (8 + eeprom_i2c.config.scl_bit)) & 1;
do_update = 1;
}
else if (address == (eeprom_i2c.config.scl_adr ^1))
{
eeprom_i2c.scl = (data >> eeprom_i2c.config.scl_bit) & 1;
do_update = 1;
}
if (do_update)
{
eeprom_i2c_update();
return;
}
m68k_unused_16_w(address, data);
}
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