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Generalized the 93C66 EEPROM emulation to other capacities, and add 16-bit word size support. Update mapper 529 to use 93C56 EEPROM in 16-bit mode.

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This commit is contained in:
NewRisingSun
2025-04-07 22:22:44 +02:00
committed by LibretroAdmin
parent 6cbb11bdd1
commit 553865663d
7 changed files with 201 additions and 162 deletions
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10
src/boards/164.c
View File

@@ -26,7 +26,7 @@
*/
#include "mapinc.h"
#include "eeprom_93C66.h"
#include "eeprom_93Cx6.h"
static uint8 *WRAM;
static uint32 WRAMSIZE;
@@ -72,12 +72,12 @@ static void sync()
setmirror(reg[0] &0x10 && ~reg[3] &0x80? MI_H: MI_V);
eeprom_93C66_write(reg[2] &0x10, reg[2] &0x04, reg[2] &0x01);
eeprom_93Cx6_write(reg[2] &0x10, reg[2] &0x04, reg[2] &0x01);
}
static DECLFR(readReg)
{
return eeprom_93C66_read()? 0x00: 0x04;
return eeprom_93Cx6_read()? 0x00: 0x04;
}
static DECLFW(writeReg)
@@ -89,7 +89,7 @@ static DECLFW(writeReg)
static void power(void)
{
memset(reg, 0, sizeof(reg));
eeprom_93C66_init();
eeprom_93Cx6_init(512, 8);
sync();
SetReadHandler (0x5400, 0x57FF, readReg);
SetWriteHandler(0x5000, 0x57FF, writeReg);
@@ -130,7 +130,7 @@ void Mapper164_Init (CartInfo *info)
AddExState(WRAM, WRAMSIZE, 0, "WRAM");
FCEU_CheatAddRAM(WRAMSIZE >> 10, 0x6000, WRAM);
eeprom_93C66_storage = eeprom_data;
eeprom_93Cx6_storage = eeprom_data;
info->battery = 1;
info->SaveGame[0] = eeprom_data;
info->SaveGameLen[0] = 512;

21
src/boards/529.c
View File

@@ -20,6 +20,14 @@
#include "mapinc.h"
#include "vrc2and4.h"
#include "eeprom_93Cx6.h"
static uint8 eeprom_data[256];
static SFORMAT stateRegs[] ={
{ eeprom_data, 256, "EEPR" },
{ 0 }
};
static void sync () {
setprg16(0x8000, VRC24_prg[1]);
@@ -29,19 +37,28 @@ static void sync () {
}
DECLFR(UNLT230_readEEPROM) {
return 0xFF;
return eeprom_93Cx6_read()? 0x01: 0x00;
}
DECLFW(UNLT230_writeEEPROM) {
eeprom_93Cx6_write(A &0x04, A &0x02, A &0x01);
}
void UNLT230_power (void) {
VRC24_power();
eeprom_93Cx6_init(256, 16);
SetReadHandler(0x5000, 0x5FFF, UNLT230_readEEPROM);
SetWriteHandler(0xF800, 0xFFFF, UNLT230_writeEEPROM);
}
void UNLT230_Init (CartInfo *info) {
VRC24_init(info, sync, 0x04, 0x08, 1, 1, 0);
info->Power =UNLT230_power;
if (info->PRGRamSaveSize) {
info->Power =UNLT230_power;
AddExState(stateRegs, ~0, 0, 0);
eeprom_93Cx6_storage = eeprom_data;
info->battery = 1;
info->SaveGame[0] = eeprom_data;
info->SaveGameLen[0] = 256;
}
}

10
src/boards/558.c
View File

@@ -23,7 +23,7 @@
/* Yancheng YC-03-09/Waixing FS??? PCB */
#include "mapinc.h"
#include "eeprom_93C66.h"
#include "eeprom_93Cx6.h"
static uint8 *WRAM;
static uint32 WRAMSIZE;
@@ -44,7 +44,7 @@ static void sync()
setchr8(0);
if (haveEEPROM)
eeprom_93C66_write(reg[2] &0x04, reg[2] &0x02, reg[2] &0x01);
eeprom_93Cx6_write(reg[2] &0x04, reg[2] &0x02, reg[2] &0x01);
}
static void hblank(void) {
@@ -60,7 +60,7 @@ static void hblank(void) {
static DECLFR(readReg)
{
if (haveEEPROM)
return eeprom_93C66_read()? 0x04: 0x00;
return eeprom_93Cx6_read()? 0x04: 0x00;
else
return reg[2] &0x04;
}
@@ -84,7 +84,7 @@ static void power(void)
{
memset(reg, 0, sizeof(reg));
if (haveEEPROM)
eeprom_93C66_init();
eeprom_93Cx6_init(512, 8);
sync();
SetReadHandler (0x5000, 0x57FF, readReg);
SetWriteHandler(0x5000, 0x57FF, writeReg);
@@ -128,7 +128,7 @@ void Mapper558_Init (CartInfo *info)
haveEEPROM =!!(info->PRGRamSaveSize &0x200);
if (haveEEPROM)
{
eeprom_93C66_storage = eeprom_data;
eeprom_93Cx6_storage = eeprom_data;
info->battery = 1;
info->SaveGame[0] = eeprom_data;
info->SaveGameLen[0] = 512;

140
src/boards/eeprom_93C66.c
View File

@@ -1,140 +0,0 @@
#include "eeprom_93C66.h"
uint8* eeprom_93C66_storage;
uint8 eeprom_93C66_opcode;
uint8 eeprom_93C66_data;
uint16 eeprom_93C66_address;
uint8 eeprom_93C66_state;
uint8 eeprom_93C66_lastCLK;
uint8 eeprom_93C66_writeEnabled;
uint8 eeprom_93C66_output;
#define OPCODE_MISC 0
#define OPCODE_WRITE 1
#define OPCODE_READ 2
#define OPCODE_ERASE 3
#define OPCODE_WRITEDISABLE 10
#define OPCODE_WRITEALL 11
#define OPCODE_ERASEALL 12
#define OPCODE_WRITEENABLE 13
#define STATE_STANDBY 0
#define STATE_STARTBIT 1
#define STATE_OPCODE 3
#define STATE_ADDRESS 12
#define STATE_DATA 20
#define STATE_FINISHED 99
void eeprom_93C66_init ()
{
eeprom_93C66_address =0;
eeprom_93C66_state =STATE_STANDBY;
eeprom_93C66_lastCLK =0;
eeprom_93C66_writeEnabled =0;
}
uint8 eeprom_93C66_read ()
{
return eeprom_93C66_output;
}
void eeprom_93C66_write (uint8 CS, uint8 CLK, uint8 DAT)
{
if (!CS && eeprom_93C66_state <= STATE_ADDRESS)
eeprom_93C66_state =STATE_STANDBY;
else
if (eeprom_93C66_state ==STATE_STANDBY && CS && CLK)
{
eeprom_93C66_state =STATE_STARTBIT;
eeprom_93C66_opcode =0;
eeprom_93C66_address =0;
eeprom_93C66_output =1;
}
else
if (CLK && !eeprom_93C66_lastCLK)
{
if (eeprom_93C66_state >=STATE_STARTBIT && eeprom_93C66_state <STATE_OPCODE)
eeprom_93C66_opcode =(eeprom_93C66_opcode <<1) | (DAT? 1: 0);
else
if (eeprom_93C66_state >=STATE_OPCODE && eeprom_93C66_state <STATE_ADDRESS)
eeprom_93C66_address =(eeprom_93C66_address <<1) | (DAT? 1: 0);
else
if (eeprom_93C66_state >=STATE_ADDRESS && eeprom_93C66_state <STATE_DATA)
{
if (eeprom_93C66_opcode ==OPCODE_WRITE || eeprom_93C66_opcode ==OPCODE_WRITEALL)
eeprom_93C66_data =(eeprom_93C66_data <<1) | (DAT? 1: 0);
else
if (eeprom_93C66_opcode ==OPCODE_READ)
{
eeprom_93C66_output =!!(eeprom_93C66_data &0x80);
eeprom_93C66_data = eeprom_93C66_data <<1;
}
}
eeprom_93C66_state++;
if (eeprom_93C66_state ==STATE_ADDRESS) {
switch (eeprom_93C66_opcode)
{
case OPCODE_MISC:
eeprom_93C66_opcode =(eeprom_93C66_address >>7) + 10;
switch (eeprom_93C66_opcode)
{
case OPCODE_WRITEDISABLE:
eeprom_93C66_writeEnabled = 0;
eeprom_93C66_state = STATE_FINISHED;
break;
case OPCODE_WRITEENABLE:
eeprom_93C66_writeEnabled = 1;
eeprom_93C66_state = STATE_FINISHED;
break;
case OPCODE_ERASEALL:
if (eeprom_93C66_writeEnabled)
{
int i;
for (i =0; i <512; i++)
eeprom_93C66_storage[i] = 0xFF;
}
eeprom_93C66_state = STATE_FINISHED;
break;
case OPCODE_WRITEALL:
eeprom_93C66_address = 0;
break;
}
break;
case OPCODE_ERASE:
if (eeprom_93C66_writeEnabled) eeprom_93C66_storage[eeprom_93C66_address] = 0xFF;
eeprom_93C66_state = STATE_FINISHED;
break;
case OPCODE_READ:
eeprom_93C66_data = eeprom_93C66_storage[eeprom_93C66_address++];
break;
}
}
else
if (eeprom_93C66_state ==STATE_DATA)
{
if (eeprom_93C66_opcode ==OPCODE_WRITE)
{
eeprom_93C66_storage[eeprom_93C66_address++] = eeprom_93C66_data;
eeprom_93C66_state = STATE_FINISHED;
}
else
if (eeprom_93C66_opcode ==OPCODE_WRITEALL)
{
eeprom_93C66_storage[eeprom_93C66_address++] = eeprom_93C66_data;
eeprom_93C66_state = CS && eeprom_93C66_address <512? STATE_ADDRESS: STATE_FINISHED;
}
else
if (eeprom_93C66_opcode ==OPCODE_READ)
{
if (eeprom_93C66_address <512) eeprom_93C66_data = eeprom_93C66_storage[eeprom_93C66_address];
eeprom_93C66_state = CS && ++eeprom_93C66_address <=512? STATE_ADDRESS: STATE_FINISHED;
}
}
if (eeprom_93C66_state == STATE_FINISHED)
{
eeprom_93C66_output = 0;
eeprom_93C66_state = STATE_STANDBY;
}
}
eeprom_93C66_lastCLK = CLK;
}

10
src/boards/eeprom_93C66.h
View File

@@ -1,10 +0,0 @@
#ifndef _EEPROM_93C66_H
#define _EEPROM_93C66_H
#include "mapinc.h"
extern uint8* eeprom_93C66_storage;
void eeprom_93C66_init ();
uint8 eeprom_93C66_read ();
void eeprom_93C66_write (uint8 CS, uint8 CLK, uint8 DAT);
#endif

162
src/boards/eeprom_93Cx6.c Normal file
View File

@@ -0,0 +1,162 @@
#include "eeprom_93Cx6.h"
uint8* eeprom_93Cx6_storage;
uint8 eeprom_93Cx6_opcode;
uint16 eeprom_93Cx6_data;
uint16 eeprom_93Cx6_address;
uint8 eeprom_93Cx6_state;
uint8 eeprom_93Cx6_lastCLK;
uint8 eeprom_93Cx6_writeEnabled;
uint8 eeprom_93Cx6_output;
size_t eeprom_93Cx6_capacity;
uint8 eeprom_93Cx6_wordSize;
static uint8 STATE_ADDRESS;
static uint8 STATE_DATA;
#define OPCODE_MISC 0
#define OPCODE_WRITE 1
#define OPCODE_READ 2
#define OPCODE_ERASE 3
#define OPCODE_WRITEDISABLE 10
#define OPCODE_WRITEALL 11
#define OPCODE_ERASEALL 12
#define OPCODE_WRITEENABLE 13
#define STATE_STANDBY 0
#define STATE_STARTBIT 1
#define STATE_OPCODE 3
#define STATE_ADDRESS8 12
#define STATE_DATA8 20
#define STATE_ADDRESS16 11
#define STATE_DATA16 27
#define STATE_FINISHED 99
void eeprom_93Cx6_init (size_t capacity, uint8 wordSize) {
eeprom_93Cx6_capacity =capacity;
eeprom_93Cx6_wordSize =wordSize;
eeprom_93Cx6_address =0;
eeprom_93Cx6_state =STATE_STANDBY;
eeprom_93Cx6_lastCLK =0;
eeprom_93Cx6_writeEnabled =0;
STATE_ADDRESS =wordSize ==16? STATE_ADDRESS16: STATE_ADDRESS8;
STATE_DATA =wordSize ==16? STATE_DATA16: STATE_DATA8;
if (capacity ==128) {
STATE_ADDRESS -=2;
STATE_DATA -=2;
}
}
uint8 eeprom_93Cx6_read () {
return eeprom_93Cx6_output;
}
void eeprom_93Cx6_write (uint8 CS, uint8 CLK, uint8 DAT) {
if (!CS && eeprom_93Cx6_state <= STATE_ADDRESS)
eeprom_93Cx6_state =STATE_STANDBY;
else
if (eeprom_93Cx6_state ==STATE_STANDBY && CS && CLK && !eeprom_93Cx6_lastCLK) {
if (DAT) eeprom_93Cx6_state =STATE_STARTBIT;
eeprom_93Cx6_opcode =0;
eeprom_93Cx6_address =0;
eeprom_93Cx6_output =1;
} else
if (CLK && !eeprom_93Cx6_lastCLK && eeprom_93Cx6_state >=STATE_STARTBIT) {
if (eeprom_93Cx6_state >=STATE_STARTBIT && eeprom_93Cx6_state <STATE_OPCODE)
eeprom_93Cx6_opcode =(eeprom_93Cx6_opcode <<1) | (DAT? 1: 0);
else
if (eeprom_93Cx6_state >=STATE_OPCODE && eeprom_93Cx6_state <STATE_ADDRESS)
eeprom_93Cx6_address =(eeprom_93Cx6_address <<1) | (DAT? 1: 0);
else
if (eeprom_93Cx6_state >=STATE_ADDRESS && eeprom_93Cx6_state <STATE_DATA) {
if (eeprom_93Cx6_opcode ==OPCODE_WRITE || eeprom_93Cx6_opcode ==OPCODE_WRITEALL)
eeprom_93Cx6_data =(eeprom_93Cx6_data <<1) | (DAT? 1: 0);
else
if (eeprom_93Cx6_opcode ==OPCODE_READ) {
eeprom_93Cx6_output =eeprom_93Cx6_wordSize ==16? !!(eeprom_93Cx6_data &0x8000): !!(eeprom_93Cx6_data &0x80);
eeprom_93Cx6_data = eeprom_93Cx6_data <<1;
}
}
eeprom_93Cx6_state++;
if (eeprom_93Cx6_state ==STATE_ADDRESS) {
switch (eeprom_93Cx6_opcode) {
case OPCODE_MISC:
eeprom_93Cx6_opcode =(eeprom_93Cx6_address >>(eeprom_93Cx6_wordSize ==16? 6: 7)) + 10;
switch (eeprom_93Cx6_opcode) {
case OPCODE_WRITEDISABLE:
eeprom_93Cx6_writeEnabled = 0;
eeprom_93Cx6_state = STATE_FINISHED;
break;
case OPCODE_WRITEENABLE:
eeprom_93Cx6_writeEnabled = 1;
eeprom_93Cx6_state = STATE_FINISHED;
break;
case OPCODE_ERASEALL:
if (eeprom_93Cx6_writeEnabled) {
int i;
for (i =0; i <eeprom_93Cx6_capacity; i++)
eeprom_93Cx6_storage[i] = 0xFF;
}
eeprom_93Cx6_state = STATE_FINISHED;
break;
case OPCODE_WRITEALL:
eeprom_93Cx6_address = 0;
break;
}
break;
case OPCODE_ERASE:
if (eeprom_93Cx6_writeEnabled) {
if (eeprom_93Cx6_wordSize ==16) {
eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |0] = 0xFF;
eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |1] = 0xFF;
} else
eeprom_93Cx6_storage[eeprom_93Cx6_address] = 0xFF;
}
eeprom_93Cx6_state = STATE_FINISHED;
break;
case OPCODE_READ:
if (eeprom_93Cx6_wordSize ==16) {
eeprom_93Cx6_data = eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |0] | eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |1] <<8;
eeprom_93Cx6_address++;
} else
eeprom_93Cx6_data = eeprom_93Cx6_storage[eeprom_93Cx6_address++];
break;
}
} else
if (eeprom_93Cx6_state ==STATE_DATA) {
if (eeprom_93Cx6_opcode ==OPCODE_WRITE) {
if (eeprom_93Cx6_wordSize ==16) {
eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |0] = eeprom_93Cx6_data &0xFF;
eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |1] = eeprom_93Cx6_data >>8;
eeprom_93Cx6_address++;
} else
eeprom_93Cx6_storage[eeprom_93Cx6_address++] = eeprom_93Cx6_data;
eeprom_93Cx6_state = STATE_FINISHED;
} else
if (eeprom_93Cx6_opcode ==OPCODE_WRITEALL) {
if (eeprom_93Cx6_wordSize ==16) {
eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |0] = eeprom_93Cx6_data &0xFF;
eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |1] = eeprom_93Cx6_data >>8;
eeprom_93Cx6_address++;
} else
eeprom_93Cx6_storage[eeprom_93Cx6_address++] = eeprom_93Cx6_data;
eeprom_93Cx6_state = CS && eeprom_93Cx6_address <eeprom_93Cx6_capacity? STATE_ADDRESS: STATE_FINISHED;
} else
if (eeprom_93Cx6_opcode ==OPCODE_READ) {
if (eeprom_93Cx6_address <eeprom_93Cx6_capacity) {
if (eeprom_93Cx6_wordSize ==16)
eeprom_93Cx6_data = eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |0] | eeprom_93Cx6_storage[eeprom_93Cx6_address <<1 |1] <<8;
else
eeprom_93Cx6_data = eeprom_93Cx6_storage[eeprom_93Cx6_address];
}
eeprom_93Cx6_state = CS && ++eeprom_93Cx6_address <=eeprom_93Cx6_capacity? STATE_ADDRESS: STATE_FINISHED;
}
}
if (eeprom_93Cx6_state == STATE_FINISHED) {
eeprom_93Cx6_output = 0;
eeprom_93Cx6_state = STATE_STANDBY;
}
}
if (eeprom_93Cx6_opcode ==OPCODE_READ && eeprom_93Cx6_state ==(STATE_ADDRESS -2)) eeprom_93Cx6_output =0; /* Dummy Zero */
eeprom_93Cx6_lastCLK = CLK;
}

10
src/boards/eeprom_93Cx6.h Normal file
View File

@@ -0,0 +1,10 @@
#ifndef _EEPROM_93CX6_H
#define _EEPROM_93CX6_H
#include "mapinc.h"
extern uint8* eeprom_93Cx6_storage;
void eeprom_93Cx6_init (size_t capacity, uint8 wordSize);
uint8 eeprom_93Cx6_read ();
void eeprom_93Cx6_write (uint8 CS, uint8 CLK, uint8 DAT);
#endif