453 lines
15 KiB
C#
453 lines
15 KiB
C#
namespace VirtualNes.Core
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{
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public class X24C01
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{
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public const int X24C01_IDLE = 0; // Idle
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public const int X24C01_ADDRESS = 1; // Address set
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public const int X24C01_READ = 2; // Read
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public const int X24C01_WRITE = 3; // Write
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public const int X24C01_ACK = 4; // Acknowledge
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public const int X24C01_ACK_WAIT = 5; // Acknowledge wait
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int now_state, next_state;
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int bitcnt;
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byte addr, data;
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byte sda;
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byte scl_old, sda_old;
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ArrayRef<byte> pEEPDATA;
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public X24C01()
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{
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now_state = X24C01_IDLE;
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next_state = X24C01_IDLE;
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addr = 0;
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data = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = null;
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}
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public void Reset(ArrayRef<byte> ptr)
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{
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now_state = X24C01_IDLE;
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next_state = X24C01_IDLE;
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addr = 0;
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data = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = ptr;
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}
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public void Write(byte scl_in, byte sda_in)
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{
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// Clock line
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byte scl_rise = (byte)(~scl_old & scl_in);
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byte scl_fall = (byte)(scl_old & ~scl_in);
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// Data line
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byte sda_rise = (byte)(~sda_old & sda_in);
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byte sda_fall = (byte)(sda_old & ~sda_in);
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byte scl_old_temp = scl_old;
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byte sda_old_temp = sda_old;
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scl_old = scl_in;
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sda_old = sda_in;
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// Start condition?
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if (scl_old_temp != 0 && sda_fall != 0)
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{
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now_state = X24C01_ADDRESS;
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bitcnt = 0;
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addr = 0;
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sda = 0xFF;
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return;
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}
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// Stop condition?
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if (scl_old_temp != 0 && sda_rise != 0)
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{
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now_state = X24C01_IDLE;
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sda = 0xFF;
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return;
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}
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// SCL ____---- RISE
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if (scl_rise != 0)
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{
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switch (now_state)
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{
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case X24C01_ADDRESS:
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if (bitcnt < 7)
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{
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// 本来はMSB->LSB
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addr = (byte)(addr & (~(1 << bitcnt)));
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addr = (byte)(addr | ((sda_in != 0 ? 1 : 0) << bitcnt));
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}
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else
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{
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if (sda_in != 0)
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{
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next_state = X24C01_READ;
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data = pEEPDATA[addr & 0x7F];
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}
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else
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{
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next_state = X24C01_WRITE;
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}
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}
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bitcnt++;
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break;
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case X24C01_ACK:
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sda = 0; // ACK
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break;
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case X24C01_READ:
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if (bitcnt < 8)
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{
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// 本来はMSB->LSB
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sda = (byte)((data & (1 << bitcnt)) != 0 ? 1 : 0);
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}
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bitcnt++;
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break;
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case X24C01_WRITE:
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if (bitcnt < 8)
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{
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// 本来はMSB->LSB
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data = (byte)(data & (~(1 << bitcnt)));
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data = (byte)(data | ((sda_in != 0 ? 1 : 0) << bitcnt));
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}
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bitcnt++;
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break;
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case X24C01_ACK_WAIT:
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if (sda_in == 0)
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{
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next_state = X24C01_IDLE;
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}
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break;
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}
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}
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// SCL ----____ FALL
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if (scl_fall != 0)
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{
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switch (now_state)
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{
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case X24C01_ADDRESS:
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if (bitcnt >= 8)
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{
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now_state = X24C01_ACK;
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sda = 0xFF;
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}
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break;
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case X24C01_ACK:
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now_state = next_state;
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bitcnt = 0;
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sda = 0xFF;
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break;
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case X24C01_READ:
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if (bitcnt >= 8)
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{
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now_state = X24C01_ACK_WAIT;
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addr = (byte)((addr + 1) & 0x7F);
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}
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break;
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case X24C01_WRITE:
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if (bitcnt >= 8)
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{
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now_state = X24C01_ACK;
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next_state = X24C01_IDLE;
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pEEPDATA[addr & 0x7F] = data;
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addr = (byte)((addr + 1) & 0x7F);
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}
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break;
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}
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}
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}
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public byte Read()
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{
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return sda;
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}
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public void Load(byte[] p)
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{
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//now_state = *((INT*)&p[0]);
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//next_state = *((INT*)&p[4]);
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//bitcnt = *((INT*)&p[8]);
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//addr = p[12];
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//data = p[13];
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//sda = p[14];
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//scl_old = p[15];
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//sda_old = p[16];
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}
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public void Save(byte[] p)
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{
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//*((INT*)&p[0]) = now_state;
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//*((INT*)&p[4]) = next_state;
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//*((INT*)&p[8]) = bitcnt;
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//p[12] = addr;
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//p[13] = data;
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//p[14] = sda;
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//p[15] = scl_old;
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//p[16] = sda_old;
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}
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}
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public class X24C02
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{
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public const int X24C02_IDLE = 0; // Idle
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public const int X24C02_DEVADDR = 1; // Device address set
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public const int X24C02_ADDRESS = 2; // Address set
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public const int X24C02_READ = 3; // Read
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public const int X24C02_WRITE = 4; // Write
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public const int X24C02_ACK = 5; // Acknowledge
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public const int X24C02_NAK = 6; // Not Acknowledge
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public const int X24C02_ACK_WAIT = 7; // Acknowledge wait
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int now_state, next_state;
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int bitcnt;
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byte addr, data, rw;
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byte sda;
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byte scl_old, sda_old;
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ArrayRef<byte> pEEPDATA;
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public X24C02()
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{
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now_state = X24C02_IDLE;
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next_state = X24C02_IDLE;
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addr = 0;
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data = 0;
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rw = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = null;
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}
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public void Reset(ArrayRef<byte> ptr)
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{
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now_state = X24C02_IDLE;
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next_state = X24C02_IDLE;
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addr = 0;
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data = 0;
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rw = 0;
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sda = 0xFF;
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scl_old = 0;
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sda_old = 0;
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pEEPDATA = ptr;
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}
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public void Write(byte scl_in, byte sda_in)
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{
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// Clock line
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byte scl_rise = (byte)(~scl_old & scl_in);
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byte scl_fall = (byte)(scl_old & ~scl_in);
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// Data line
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byte sda_rise = (byte)(~sda_old & sda_in);
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byte sda_fall = (byte)(sda_old & ~sda_in);
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byte scl_old_temp = scl_old;
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byte sda_old_temp = sda_old;
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scl_old = scl_in;
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sda_old = sda_in;
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// Start condition?
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if (scl_old_temp != 0 && sda_fall != 0)
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{
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now_state = X24C02_DEVADDR;
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bitcnt = 0;
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sda = 0xFF;
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return;
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}
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// Stop condition?
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if (scl_old_temp != 0 && sda_rise != 0)
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{
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now_state = X24C02_IDLE;
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sda = 0xFF;
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return;
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}
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// SCL ____---- RISE
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if (scl_rise != 0)
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{
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switch (now_state)
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{
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case X24C02_DEVADDR:
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if (bitcnt < 8)
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{
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data = (byte)(data & (~(1 << (7 - bitcnt))));
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data = (byte)(data | ((sda_in != 0 ? 1 : 0) << (7 - bitcnt)));
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}
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bitcnt++;
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break;
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case X24C02_ADDRESS:
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if (bitcnt < 8)
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{
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addr = (byte)(addr & (~(1 << (7 - bitcnt))));
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addr = (byte)(addr | ((sda_in != 0 ? 1 : 0) << (7 - bitcnt)));
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}
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bitcnt++;
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break;
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case X24C02_READ:
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if (bitcnt < 8)
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{
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sda = (byte)((data & (1 << (7 - bitcnt))) != 0 ? 1 : 0);
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}
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bitcnt++;
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break;
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case X24C02_WRITE:
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if (bitcnt < 8)
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{
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data = (byte)(data & (~(1 << (7 - bitcnt))));
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data = (byte)(data | ((sda_in != 0 ? 1 : 0) << (7 - bitcnt)));
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}
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bitcnt++;
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break;
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case X24C02_NAK:
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sda = 0xFF; // NAK
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break;
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case X24C02_ACK:
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sda = 0; // ACK
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break;
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case X24C02_ACK_WAIT:
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if (sda_in == 0)
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{
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next_state = X24C02_READ;
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data = pEEPDATA[addr];
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}
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break;
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}
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}
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// SCL ----____ FALL
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if (scl_fall != 0)
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{
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switch (now_state)
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{
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case X24C02_DEVADDR:
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if (bitcnt >= 8)
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{
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if ((data & 0xA0) == 0xA0)
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{
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now_state = X24C02_ACK;
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rw = (byte)(data & 0x01);
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sda = 0xFF;
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if (rw != 0)
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{
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// Now address read
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next_state = X24C02_READ;
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data = pEEPDATA[addr];
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}
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else
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{
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next_state = X24C02_ADDRESS;
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}
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bitcnt = 0;
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}
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else
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{
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now_state = X24C02_NAK;
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next_state = X24C02_IDLE;
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sda = 0xFF;
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}
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}
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break;
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case X24C02_ADDRESS:
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if (bitcnt >= 8)
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{
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now_state = X24C02_ACK;
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sda = 0xFF;
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if (rw != 0)
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{
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// Readでは絶対来ないが念の為
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next_state = X24C02_IDLE;
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}
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else
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{
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// to Data Write
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next_state = X24C02_WRITE;
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}
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bitcnt = 0;
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}
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break;
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case X24C02_READ:
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if (bitcnt >= 8)
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{
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now_state = X24C02_ACK_WAIT;
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addr = (byte)((addr + 1) & 0xFF);
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}
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break;
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case X24C02_WRITE:
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if (bitcnt >= 8)
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{
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pEEPDATA[addr] = data;
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now_state = X24C02_ACK;
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next_state = X24C02_WRITE;
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addr = (byte)((addr + 1) & 0xFF);
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bitcnt = 0;
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}
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break;
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case X24C02_NAK:
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now_state = X24C02_IDLE;
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bitcnt = 0;
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sda = 0xFF;
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break;
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case X24C02_ACK:
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now_state = next_state;
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bitcnt = 0;
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sda = 0xFF;
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break;
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case X24C02_ACK_WAIT:
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now_state = next_state;
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bitcnt = 0;
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sda = 0xFF;
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break;
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}
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}
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}
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public byte Read()
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{
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return sda;
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}
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public void Load(byte[] p)
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{
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//now_state = *((INT*)&p[0]);
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//next_state = *((INT*)&p[4]);
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//bitcnt = *((INT*)&p[8]);
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//addr = p[12];
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//data = p[13];
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//rw = p[14];
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//sda = p[15];
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//scl_old = p[16];
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//sda_old = p[17];
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}
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public void Save(byte[] p)
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{
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//*((INT*)&p[0]) = now_state;
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//*((INT*)&p[4]) = next_state;
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//*((INT*)&p[8]) = bitcnt;
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//p[12] = addr;
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//p[13] = data;
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//p[14] = rw;
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//p[15] = sda;
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//p[16] = scl_old;
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//p[17] = sda_old;
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}
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}
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} |