public static void reset()
{
eepromData = new byte[8192];
for (int i = 0; i < eepromData.Length; i++)
{
eepromData[i] = 0xFF;
}
eepromBuffer = new byte[16];
eepromMode = EEPROMSTATE.EEPROM_IDLE;
eepromBits = 0;
eepromByte = 0;
eepromAddress = 0;
}
public static int read()
{
switch (eepromMode)
{
case EEPROMSTATE.EEPROM_IDLE:
case EEPROMSTATE.EEPROM_READADDRESS:
case EEPROMSTATE.EEPROM_WRITEDATA:
return(1);
case EEPROMSTATE.EEPROM_READDATA:
{
eepromBits++;
if (eepromBits == 4)
{
eepromMode = EEPROMSTATE.EEPROM_READDATA2;
eepromBits = 0;
eepromByte = 0;
}
return(0);
}
case EEPROMSTATE.EEPROM_READDATA2:
{
int address = eepromAddress << 3;
int mask = 1 << (7 - (eepromBits & 7));
int data = 0;
if ((eepromData[address + eepromByte] & mask) > 0)
{
data = 1;
}
eepromBits++;
if ((eepromBits & 7) == 0)
{
eepromByte++;
}
if (eepromBits == 0x40)
{
eepromMode = EEPROMSTATE.EEPROM_IDLE;
}
return(data);
}
default:
return(0);
}
}
public static void write(byte value)
{
if (DMA.cpuDmaCount == 0)
{
return;
}
int bit = value & 1;
switch (eepromMode)
{
case EEPROMSTATE.EEPROM_IDLE:
eepromByte = 0;
eepromBits = 1;
eepromBuffer[eepromByte] = (byte)bit;
eepromMode = EEPROMSTATE.EEPROM_READADDRESS;
break;
case EEPROMSTATE.EEPROM_READADDRESS:
eepromBuffer[eepromByte] <<= 1;
eepromBuffer[eepromByte] = (byte)(eepromBuffer[eepromByte] | bit);
eepromBits++;
if ((eepromBits & 7) == 0)
{
eepromByte++;
}
if (DMA.cpuDmaCount == 0x11 || DMA.cpuDmaCount == 0x51)
{
if (eepromBits == 0x11)
{
//eepromInUse = true;
eepromAddress = ((eepromBuffer[0] & 0x3F) << 8) | ((eepromBuffer[1] & 0xFF));
if ((eepromBuffer[0] & 0x40) == 0)
{
eepromBuffer[0] = (byte)bit;
eepromBits = 1;
eepromByte = 0;
eepromMode = EEPROMSTATE.EEPROM_WRITEDATA;
}
else
{
eepromMode = EEPROMSTATE.EEPROM_READDATA;
eepromByte = 0;
eepromBits = 0;
}
}
}
else
{
if (eepromBits == 9)
{
//eepromInUse = true;
eepromAddress = (eepromBuffer[0] & 0x3F);
if ((eepromBuffer[0] & 0x40) == 0)
{
eepromBuffer[0] = (byte)bit;
eepromBits = 1;
eepromByte = 0;
eepromMode = EEPROMSTATE.EEPROM_WRITEDATA;
}
else
{
eepromMode = EEPROMSTATE.EEPROM_READDATA;
eepromByte = 0;
eepromBits = 0;
}
}
}
break;
case EEPROMSTATE.EEPROM_READDATA:
case EEPROMSTATE.EEPROM_READDATA2:
// should we reset here?
eepromMode = EEPROMSTATE.EEPROM_IDLE;
break;
case EEPROMSTATE.EEPROM_WRITEDATA:
eepromBuffer[eepromByte] <<= 1;
eepromBuffer[eepromByte] = (byte)(eepromBuffer[eepromByte] | bit);
eepromBits++;
if ((eepromBits & 7) == 0)
{
eepromByte++;
}
if (eepromBits == 0x40)
{
//eepromInUse = true;
// write data;
for (int i = 0; i < 8; i++)
{
eepromData[(eepromAddress << 3) + i] = eepromBuffer[i];
}
}
else if (eepromBits == 0x41)
{
eepromMode = EEPROMSTATE.EEPROM_IDLE;
eepromByte = 0;
eepromBits = 0;
}
break;
}
}
