/// <summary>
/// Stores a <see cref="byte"/> at the specified location in memory.
/// </summary>
/// <param name="address">Address to store at.</param>
/// <param name="value">Data to store.</param>
public void SetU8(ushort address, byte value)
{
if (!ValidAddress(address, sizeof(byte)))
{
throw MemoryException(address);
}
memory[address] = value;
MemoryWrite?.Invoke(this, new MemoryWriteEventArgs(address, value));
}
public AdaFruitST7735(
Cpu.Pin chipSelect,
Cpu.Pin dc,
Cpu.Pin reset,
SPI.SPI_module spiModule = SPI.SPI_module.SPI1,
uint speedKHz = (uint)9500,
VirtualMemory vm = null)
{
Width = 128;
Height = 160;
AutoRefreshScreen = false;
DataCommand = new OutputPort(dc, false);
Reset = new OutputPort(reset, true);
var extendedSpiConfig = new ExtendedSpiConfiguration(
SPI_mod: spiModule,
ChipSelect_Port: chipSelect,
ChipSelect_ActiveState: false,
ChipSelect_SetupTime: 0,
ChipSelect_HoldTime: 0,
Clock_IdleState: false,
Clock_Edge: true,
Clock_RateKHz: speedKHz,
BitsPerTransfer: 8);
Spi = new SPI(extendedSpiConfig);
if (vm == null) {
SpiBuffer = new byte[Width * Height * sizeof(ushort)];
MemoryWriteFunction = SpiBufferWrite;
} else {
VM = vm;
MemoryWriteFunction = VirtualMemoryWrite;
}
Initialize();
}
private BitwiseMultiwayMux m_gJumpMux;//an example of a control unit compnent - a mux that controls whether a jump is made
private void ConnectControls()
{
//1. connect control of mux 1 (selects entrance to register A)
m_gAMux.ConnectControl(Instruction[Type]);
//2. connect control to mux 2 (selects A or M entrance to the ALU)
m_gMAMux.ConnectControl(Instruction[A]);
//3. consider all instruction bits only if C type instruction (MSB of instruction is 1)
//4. connect ALU control bits
m_gALU.ZeroX.ConnectInput(Instruction[C1]);
m_gALU.NotX.ConnectInput(Instruction[C2]);
m_gALU.ZeroY.ConnectInput(Instruction[C3]);
m_gALU.NotY.ConnectInput(Instruction[C4]);
m_gALU.F.ConnectInput(Instruction[C5]);
m_gALU.NotOutput.ConnectInput(Instruction[C6]);
//5. connect control to register D (very simple)
and_D.ConnectInput1(Instruction[D2]);
and_D.ConnectInput2(Instruction[Type]);
m_rD.Load.ConnectInput(and_D.Output);
//6. connect control to register A (a bit more complicated)
not_A.ConnectInput(Instruction[Type]);
or_A.ConnectInput1(not_A.Output);
or_A.ConnectInput2(Instruction[D1]);
m_rA.Load.ConnectInput(or_A.Output);
//7. connect control to MemoryWrite
and_MW.ConnectInput1(Instruction[D3]);
and_MW.ConnectInput2(Instruction[Type]);
MemoryWrite.ConnectInput(and_MW.Output);
//8. create inputs for jump mux
not_Zero.ConnectInput(m_gALU.Zero);
not_Neg.ConnectInput(m_gALU.Negative);
and_JMP.ConnectInput1(not_Zero.Output);
and_JMP.ConnectInput2(not_Neg.Output);
//not3.ConnectInput(m_gALU.Negative);
or_JMP.ConnectInput2(m_gALU.Negative);
or_JMP.ConnectInput1(m_gALU.Zero);
//not4.ConnectInput(m_gALU.Zero);
//or2.ConnectInput1(m_gALU.Zero);
//or2.ConnectInput2(m_gALU.Negative);
//9. connect jump mux (this is the most complicated part)
m_gJumpMux = new BitwiseMultiwayMux(1, 3);
J_0.ConnectInput(wi1);
m_gJumpMux.Inputs[0][0].ConnectInput(J_0);
JGT.ConnectInput(and_JMP.Output);
m_gJumpMux.Inputs[1][0].ConnectInput(JGT);
JEQ.ConnectInput(m_gALU.Zero);
m_gJumpMux.Inputs[2][0].ConnectInput(JEQ);
JGE.ConnectInput(not_Neg.Output);
m_gJumpMux.Inputs[3][0].ConnectInput(JGE);
JLT.ConnectInput(m_gALU.Negative);
m_gJumpMux.Inputs[4][0].ConnectInput(JLT);
JNE.ConnectInput(not_Zero.Output);
m_gJumpMux.Inputs[5][0].ConnectInput(JNE);
JLE.ConnectInput(or_JMP.Output);
m_gJumpMux.Inputs[6][0].ConnectInput(JLE);
wi2.Value = 1;
J_1.ConnectInput(wi2);
m_gJumpMux.Inputs[7][0].ConnectInput(J_1);
and_JM2.ConnectInput1(Instruction[Type]);
and_JM2.ConnectInput2(Instruction[J1]);
and_JM1.ConnectInput1(Instruction[Type]);
and_JM1.ConnectInput2(Instruction[J2]);
and_JM0.ConnectInput1(Instruction[Type]);
and_JM0.ConnectInput2(Instruction[J3]);
JMP[2].ConnectInput(and_JM2.Output);
JMP[1].ConnectInput(and_JM1.Output);
JMP[0].ConnectInput(and_JM0.Output);
m_gJumpMux.ConnectControl(JMP);
//10. connect PC load control
m_rPC.ConnectLoad(m_gJumpMux.Output[0]);
}
private void ConnectControls()
{
or = new OrGate();
muxArray = new MuxGate[9];
NotGate not = new NotGate();
JGT = new AndGate();
JGE = new OrGate();
JLE = new OrGate();
JNE = new NotGate();
notArray = new NotGate[2];
for (int i = 0; i < notArray.Length; i++)
{
notArray[i] = new NotGate();
}
m_gJumpMux = new BitwiseMultiwayMux(1, 3);
jump = new WireSet(3);
andForPCLoad = new AndGate();
Wire PCLoad = new Wire();
//1.
m_gAMux.ConnectControl(Instruction[Type]);
//2. connect control to mux 2 (selects A or M entrance to the ALU)
m_gMAMux.ConnectControl(Instruction[A]);
//3. consider all instruction bits only if C type instruction (MSB of instruction is 1)
for (int i = 0; i < muxArray.Length; i++)
{
muxArray[i] = new MuxGate();
muxArray[i].ConnectInput1(new Wire());
muxArray[i].ConnectInput2(Instruction[i + 3]);
muxArray[i].ConnectControl(Instruction[Type]);
}
//4. connect ALU control bits
m_gALU.ZeroX.ConnectInput(muxArray[C1 - 3].Output);
m_gALU.NotX.ConnectInput(muxArray[C2 - 3].Output);
m_gALU.ZeroY.ConnectInput(muxArray[C3 - 3].Output);
m_gALU.NotY.ConnectInput(muxArray[C4 - 3].Output);
m_gALU.F.ConnectInput(muxArray[C5 - 3].Output);
m_gALU.NotOutput.ConnectInput(muxArray[C6 - 3].Output);
//5. connect control to register D (very simple)
m_rD.Load.ConnectInput(muxArray[D2 - 3].Output);
//6. connect control to register A (a bit more complicated)
not.ConnectInput(Instruction[Type]);
or.ConnectInput1(not.Output);
or.ConnectInput2(muxArray[D1 - 3].Output);
m_rA.Load.ConnectInput(or.Output);
//7. connect control to MemoryWrite
MemoryWrite.ConnectInput(muxArray[D3 - 3].Output);
//8. create inputs for jump mux
notArray[0].ConnectInput(m_gALU.Zero);
notArray[1].ConnectInput(m_gALU.Negative);
//JGT:
JGT.ConnectInput1(notArray[0].Output);
JGT.ConnectInput2(notArray[1].Output);
//JGE:
JGE.ConnectInput1(m_gALU.Zero);
JGE.ConnectInput2(notArray[1].Output);
//JNE:
JNE.ConnectInput(notArray[0].Output);
//JLE:
JLE.ConnectInput1(m_gALU.Zero);
JLE.ConnectInput2(m_gALU.Negative);
WireSet JGTOut = new WireSet(1);
WireSet JEQOut = new WireSet(1);
WireSet JLTOut = new WireSet(1);
WireSet JGEOut = new WireSet(1);
WireSet JNEOut = new WireSet(1);
WireSet JLEOut = new WireSet(1);
JGTOut[0].ConnectInput(JGT.Output);
JEQOut[0].ConnectInput(m_gALU.Zero);
JLTOut[0].ConnectInput(m_gALU.Negative);
JGEOut[0].ConnectInput(JGE.Output);
JNEOut[0].ConnectInput(JNE.Output);
JLEOut[0].ConnectInput(JLE.Output);
//9. connect jump mux (this is the most complicated part)
jump[0].ConnectInput(Instruction[J3]);
jump[1].ConnectInput(Instruction[J2]);
jump[2].ConnectInput(Instruction[J1]);
m_gJumpMux.ConnectControl(jump);
m_gJumpMux.ConnectInput(0, new WireSet(1));
m_gJumpMux.ConnectInput(1, JGTOut);
m_gJumpMux.ConnectInput(2, JEQOut);
m_gJumpMux.ConnectInput(3, JGEOut);
m_gJumpMux.ConnectInput(4, JLTOut);
m_gJumpMux.ConnectInput(5, JNEOut);
m_gJumpMux.ConnectInput(6, JLEOut);
m_gJumpMux.Inputs[7].Value = 1;
//10. connect PC load control
andForPCLoad.ConnectInput1(m_gJumpMux.Output[0]);
andForPCLoad.ConnectInput2(Instruction[Type]);
m_rPC.ConnectLoad(andForPCLoad.Output);
}
private void ConnectMemoryWrite()
{
MemoryWrite.ConnectInput(m_gInstructionMux.Output[D3]);
}
private void ConnectControls()
{
//1. connect control of mux 1 (selects entrance to register A)
m_gAMux.ConnectControl(Instruction[Type]); // opcode
//2. connect control to mux 2 (selects A or M entrance to the ALU)
m_gMAMux.ConnectControl(Instruction[A]); // a/m
//3. consider all instruction bits only if C type instruction (MSB of instruction is 1)
//4. connect ALU control bits
m_gALU.ZeroX.ConnectInput(Instruction[C1]);
m_gALU.NotX.ConnectInput(Instruction[C2]);
m_gALU.ZeroY.ConnectInput(Instruction[C3]);
m_gALU.NotY.ConnectInput(Instruction[C4]);
m_gALU.F.ConnectInput(Instruction[C5]);
m_gALU.NotOutput.ConnectInput(Instruction[C6]);
//5. connect control to register D (very simple)
and = new AndGate();
and.ConnectInput1(Instruction[Type]);
and.ConnectInput2(Instruction[D2]);
m_rD.Load.ConnectInput(and.Output);
//6. connect control to register A (a bit more complicated)
orOfA = new OrGate(); // shortcut for what we did in lesson "instead using and & not gates"
// to implement as in lecture
andOfA = new AndGate();
notOfA = new NotGate();
notOfA.ConnectInput(Instruction[Type]);
andOfA.ConnectInput1(Instruction[Type]);
andOfA.ConnectInput2(Instruction[D1]);
orOfA.ConnectInput1(andOfA.Output);
orOfA.ConnectInput2(notOfA.Output);
m_rA.Load.ConnectInput(orOfA.Output);
//7. connect control to MemoryWritea
andOfMemoryWrite = new AndGate();
andOfMemoryWrite.ConnectInput1(Instruction[Type]);
andOfMemoryWrite.ConnectInput2(Instruction[D3]);
MemoryWrite.ConnectInput(andOfMemoryWrite.Output);
//8. create inputs for jump mux
Wire on = new Wire();
on.Value = 1;
Wire off = new Wire();
off.Value = 0;
m_gJumpMux = new BitwiseMultiwayMux(1, 3); // so i'm gonna use it as jump box in lesson
jumpOr1 = new OrGate();
jumpOr1.ConnectInput1(m_gALU.Zero);
jumpOr1.ConnectInput2(m_gALU.Negative);
jumpNot1 = new NotGate();
jumpNot1.ConnectInput(jumpOr1.Output);
jumpNot2 = new NotGate();
jumpNot2.ConnectInput(m_gALU.Negative);
jumpNot3 = new NotGate();
jumpNot3.ConnectInput(m_gALU.Zero);
jumpOr2 = new OrGate();
jumpOr2.ConnectInput1(m_gALU.Zero);
jumpOr2.ConnectInput2(m_gALU.Negative);
Wire input1 = off; // we did somthing like this in practical session
Wire input2 = jumpNot1.Output;
Wire input3 = m_gALU.Zero;
Wire input4 = jumpNot2.Output;
Wire input5 = m_gALU.Negative;
Wire input6 = jumpNot3.Output;
Wire input7 = jumpOr2.Output;
Wire input8 = on;
//9. connect jump mux (this is the most complicated part
m_gJumpMux.Inputs[0][0].ConnectInput(input1);
m_gJumpMux.Inputs[1][0].ConnectInput(input2);
m_gJumpMux.Inputs[2][0].ConnectInput(input3);
m_gJumpMux.Inputs[3][0].ConnectInput(input4);
m_gJumpMux.Inputs[4][0].ConnectInput(input5);
m_gJumpMux.Inputs[5][0].ConnectInput(input6);
m_gJumpMux.Inputs[6][0].ConnectInput(input7);
m_gJumpMux.Inputs[7][0].ConnectInput(input8);
m_gJumpMux.Control[0].ConnectInput(Instruction[J3]);
m_gJumpMux.Control[1].ConnectInput(Instruction[J2]);
m_gJumpMux.Control[2].ConnectInput(Instruction[J1]);
//10. connect PC load control
andOfpc = new AndGate();
andOfpc.ConnectInput1(Instruction[Type]);
andOfpc.ConnectInput2(m_gJumpMux.Output[0]);
m_rPC.ConnectLoad(andOfpc.Output);
}