1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/gba/EEprom.cpp	Sat Mar 03 10:31:27 2012 -0600
     1.3 @@ -0,0 +1,210 @@
     1.4 +#include <cstring>
     1.5 +
     1.6 +#include "GBA.h" // for SAVE_GAME_VERSION_3
     1.7 +#include "EEprom.h"
     1.8 +#include "../common/System.h"
     1.9 +#include "../common/Util.h"
    1.10 +
    1.11 +extern int32 cpuDmaCount;
    1.12 +
    1.13 +int32 eepromMode    = EEPROM_IDLE;
    1.14 +int32 eepromByte    = 0;
    1.15 +int32 eepromBits    = 0;
    1.16 +int32 eepromAddress = 0;
    1.17 +u8    eepromData[0x2000];
    1.18 +u8    eepromBuffer[16];
    1.19 +bool8 eepromInUse = false;
    1.20 +int32 eepromSize  = 512;
    1.21 +
    1.22 +variable_desc eepromSaveData[] = {
    1.23 +	{ &eepromMode,		sizeof(int32) },
    1.24 +	{ &eepromByte,		sizeof(int32) },
    1.25 +	{ &eepromBits,		sizeof(int32) },
    1.26 +	{ &eepromAddress,	sizeof(int32) },
    1.27 +	{ &eepromInUse,		sizeof(bool8) },
    1.28 +	{ &eepromData[0],             512 },
    1.29 +	{ &eepromBuffer[0],            16 },
    1.30 +	{ NULL,							0 }
    1.31 +};
    1.32 +
    1.33 +void eepromReset()
    1.34 +{
    1.35 +	eepromMode    = EEPROM_IDLE;
    1.36 +	eepromByte    = 0;
    1.37 +	eepromBits    = 0;
    1.38 +	eepromAddress = 0;
    1.39 +	eepromInUse   = false;
    1.40 +	eepromSize    = 512;
    1.41 +}
    1.42 +
    1.43 +void eepromErase()
    1.44 +{
    1.45 +	memset(eepromData, 0, 0x2000*sizeof(u8));
    1.46 +	eepromMode    = EEPROM_IDLE;
    1.47 +	eepromByte    = 0;
    1.48 +	eepromBits    = 0;
    1.49 +	eepromAddress = 0;
    1.50 +	memset(eepromBuffer, 0, 16*sizeof(u8));
    1.51 +	eepromInUse = false;
    1.52 +	eepromSize  = 512;
    1.53 +}
    1.54 +
    1.55 +void eepromSaveGame(gzFile gzFile)
    1.56 +{
    1.57 +	utilWriteData(gzFile, eepromSaveData);
    1.58 +	utilWriteInt(gzFile, eepromSize);
    1.59 +	utilGzWrite(gzFile, eepromData, 0x2000);
    1.60 +}
    1.61 +
    1.62 +void eepromReadGame(gzFile gzFile, int version)
    1.63 +{
    1.64 +	utilReadData(gzFile, eepromSaveData);
    1.65 +	if (version >= SAVE_GAME_VERSION_3)
    1.66 +	{
    1.67 +		eepromSize = utilReadInt(gzFile);
    1.68 +		utilGzRead(gzFile, eepromData, 0x2000);
    1.69 +	}
    1.70 +	else
    1.71 +	{
    1.72 +		// prior to 0.7.1, only 4K EEPROM was supported
    1.73 +		eepromSize = 512;
    1.74 +	}
    1.75 +}
    1.76 +
    1.77 +int eepromRead(u32 /* address */)
    1.78 +{
    1.79 +	switch (eepromMode)
    1.80 +	{
    1.81 +	case EEPROM_IDLE:
    1.82 +	case EEPROM_READADDRESS:
    1.83 +	case EEPROM_WRITEDATA:
    1.84 +		return 1;
    1.85 +	case EEPROM_READDATA:
    1.86 +	{
    1.87 +		eepromBits++;
    1.88 +		if (eepromBits == 4)
    1.89 +		{
    1.90 +			eepromMode = EEPROM_READDATA2;
    1.91 +			eepromBits = 0;
    1.92 +			eepromByte = 0;
    1.93 +		}
    1.94 +		return 0;
    1.95 +	}
    1.96 +	case EEPROM_READDATA2:
    1.97 +	{
    1.98 +		int data    = 0;
    1.99 +		int address = eepromAddress << 3;
   1.100 +		int mask    = 1 << (7 - (eepromBits & 7));
   1.101 +		data = (eepromData[address+eepromByte] & mask) ? 1 : 0;
   1.102 +		eepromBits++;
   1.103 +		if ((eepromBits & 7) == 0)
   1.104 +			eepromByte++;
   1.105 +		if (eepromBits == 0x40)
   1.106 +			eepromMode = EEPROM_IDLE;
   1.107 +		return data;
   1.108 +	}
   1.109 +	default:
   1.110 +		return 0;
   1.111 +	}
   1.112 +	return 1;
   1.113 +}
   1.114 +
   1.115 +void eepromWrite(u32 /* address */, u8 value)
   1.116 +{
   1.117 +	if (cpuDmaCount == 0)
   1.118 +		return;
   1.119 +	int bit = value & 1;
   1.120 +	switch (eepromMode)
   1.121 +	{
   1.122 +	case EEPROM_IDLE:
   1.123 +		eepromByte = 0;
   1.124 +		eepromBits = 1;
   1.125 +		eepromBuffer[eepromByte] = bit;
   1.126 +		eepromMode = EEPROM_READADDRESS;
   1.127 +		break;
   1.128 +	case EEPROM_READADDRESS:
   1.129 +		eepromBuffer[eepromByte] <<= 1;
   1.130 +		eepromBuffer[eepromByte]  |= bit;
   1.131 +		eepromBits++;
   1.132 +		if ((eepromBits & 7) == 0)
   1.133 +		{
   1.134 +			eepromByte++;
   1.135 +		}
   1.136 +		if (cpuDmaCount == 0x11 || cpuDmaCount == 0x51)
   1.137 +		{
   1.138 +			if (eepromBits == 0x11)
   1.139 +			{
   1.140 +				eepromInUse   = true;
   1.141 +				eepromSize    = 0x2000;
   1.142 +				eepromAddress = ((eepromBuffer[0] & 0x3F) << 8) |
   1.143 +				                ((eepromBuffer[1] & 0xFF));
   1.144 +				if (!(eepromBuffer[0] & 0x40))
   1.145 +				{
   1.146 +					eepromBuffer[0] = bit;
   1.147 +					eepromBits      = 1;
   1.148 +					eepromByte      = 0;
   1.149 +					eepromMode      = EEPROM_WRITEDATA;
   1.150 +				}
   1.151 +				else
   1.152 +				{
   1.153 +					eepromMode = EEPROM_READDATA;
   1.154 +					eepromByte = 0;
   1.155 +					eepromBits = 0;
   1.156 +				}
   1.157 +			}
   1.158 +		}
   1.159 +		else
   1.160 +		{
   1.161 +			if (eepromBits == 9)
   1.162 +			{
   1.163 +				eepromInUse   = true;
   1.164 +				eepromAddress = (eepromBuffer[0] & 0x3F);
   1.165 +				if (!(eepromBuffer[0] & 0x40))
   1.166 +				{
   1.167 +					eepromBuffer[0] = bit;
   1.168 +					eepromBits      = 1;
   1.169 +					eepromByte      = 0;
   1.170 +					eepromMode      = EEPROM_WRITEDATA;
   1.171 +				}
   1.172 +				else
   1.173 +				{
   1.174 +					eepromMode = EEPROM_READDATA;
   1.175 +					eepromByte = 0;
   1.176 +					eepromBits = 0;
   1.177 +				}
   1.178 +			}
   1.179 +		}
   1.180 +		break;
   1.181 +	case EEPROM_READDATA:
   1.182 +	case EEPROM_READDATA2:
   1.183 +		// should we reset here?
   1.184 +		eepromMode = EEPROM_IDLE;
   1.185 +		break;
   1.186 +	case EEPROM_WRITEDATA:
   1.187 +		eepromBuffer[eepromByte] <<= 1;
   1.188 +		eepromBuffer[eepromByte]  |= bit;
   1.189 +		eepromBits++;
   1.190 +		if ((eepromBits & 7) == 0)
   1.191 +		{
   1.192 +			eepromByte++;
   1.193 +		}
   1.194 +		if (eepromBits == 0x40)
   1.195 +		{
   1.196 +			eepromInUse = true;
   1.197 +			// write data;
   1.198 +			for (int i = 0; i < 8; i++)
   1.199 +			{
   1.200 +				eepromData[(eepromAddress << 3) + i] = eepromBuffer[i];
   1.201 +			}
   1.202 +			systemSaveUpdateCounter = SYSTEM_SAVE_UPDATED;
   1.203 +		}
   1.204 +		else if (eepromBits == 0x41)
   1.205 +		{
   1.206 +			eepromMode = EEPROM_IDLE;
   1.207 +			eepromByte = 0;
   1.208 +			eepromBits = 0;
   1.209 +		}
   1.210 +		break;
   1.211 +	}
   1.212 +}
   1.213 +