private void TryFinishTransmission()
{
bytesSent++;
if (bytesSent == totalBytes)
{
RegisteredPeripheral.FinishTransmission();
}
}
private void DisableSSI(bool oldValue, bool newValue)
{
this.Log(LogLevel.Debug, "SSI {0}.", newValue ? "enabled" : "disabled");
receiveFifo.Clear();
RefreshInterrupt();
if (!newValue && oldValue)
{
RegisteredPeripheral.FinishTransmission();
}
}
public PicoRV_SPI(Machine machine) : base(machine)
{
bbHelper = new BitBangHelper(8, loggingParent: this, outputMsbFirst: true);
var registers = new Dictionary <long, DoubleWordRegister>
{
{ (long)Registers.Config1, new DoubleWordRegister(this)
.WithFlag(0, out var data0, FieldMode.Write, name: "data0")
.WithFlag(1, FieldMode.Write, name: "data1") // data 1-3 used in QSPI only
.WithFlag(2, FieldMode.Write, name: "data2")
.WithFlag(3, FieldMode.Write, name: "data3")
.WithFlag(4, out var clock, FieldMode.Write, name: "clk")
.WithFlag(5, out var chipSelectNegated, FieldMode.Write, name: "cs_n")
.WithReservedBits(6, 2)
.WithWriteCallback((_, val) =>
{
if (memioEnable.Value)
{
this.Log(LogLevel.Warning, "MEMIO mode not enabled - bit banging not supported in this mode");
return;
}
if (qspiEnable.Value)
{
this.Log(LogLevel.Warning, "QSPI mode not yet supported");
return;
}
if (RegisteredPeripheral == null)
{
this.Log(LogLevel.Warning, "Trying to send bytes over SPI, but there is no device attached");
return;
}
if (chipSelectNegated.Value && !previousChipSelectNegated)
{
this.Log(LogLevel.Noisy, "ChipSelect signal down - finishing the transmission");
RegisteredPeripheral.FinishTransmission();
bbHelper.ResetOutput();
}
previousChipSelectNegated = chipSelectNegated.Value;
// do not latch bits when MEMIO is enabled or chipSelect is not set
if (bbHelper.Update(clock.Value, data0.Value, !memioEnable.Value && !chipSelectNegated.Value))
{
this.Log(LogLevel.Noisy, "Sending byte 0x{0:X}", bbHelper.DecodedOutput);
var input = RegisteredPeripheral.Transmit((byte)bbHelper.DecodedOutput);
this.Log(LogLevel.Noisy, "Received byte 0x{0:X}", input);
bbHelper.SetInputBuffer(input);
}
}) },
public LiteX_SPI_Flash(Machine machine) : base(machine)
{
bbHelper = new BitBangHelper(8, loggingParent: this, outputMsbFirst: true);
var registers = new Dictionary <long, DoubleWordRegister>
{
{ (long)Registers.BitBang, new DoubleWordRegister(this)
.WithFlag(0, out var valueSignal, FieldMode.Write, name: "value")
.WithFlag(1, out var clockSignal, FieldMode.Write, name: "clk")
.WithFlag(2, out var chipSelectNegatedSignal, FieldMode.Write, name: "cs_n")
.WithFlag(3, out var dqInputSignal, FieldMode.Write, name: "dq_input")
.WithWriteCallback((_, val) =>
{
if (!bitBangEnabled.Value)
{
this.Log(LogLevel.Warning, "Write to not-enabled BitBang register ignored");
return;
}
if (RegisteredPeripheral == null)
{
this.Log(LogLevel.Warning, "Trying to send bytes over SPI, but there is no device attached");
return;
}
if (chipSelectNegatedSignal.Value && !previousChipSelectNegatedSignal)
{
this.Log(LogLevel.Noisy, "ChipSelect signal down - finishing the transmission");
RegisteredPeripheral.FinishTransmission();
}
previousChipSelectNegatedSignal = chipSelectNegatedSignal.Value;
// do not latch bits when dqInputSignal is set or chipSelect is not set
if (bbHelper.Update(clockSignal.Value, valueSignal.Value, !dqInputSignal.Value && !chipSelectNegatedSignal.Value))
{
this.Log(LogLevel.Noisy, "Sending byte 0x{0:X}", bbHelper.DecodedOutput);
var input = RegisteredPeripheral.Transmit((byte)bbHelper.DecodedOutput);
this.Log(LogLevel.Noisy, "Received byte 0x{0:X}", input);
bbHelper.SetInputBuffer(input);
}
}) },
private void TryStartTransmission()
{
if (!txEnable.Value || command != Commands.TransferData)
{
this.Log(LogLevel.Debug, "Tried to issue a transaction without full configuration.");
return;
}
if (RegisteredPeripheral == null)
{
this.Log(LogLevel.Warning, "Trying to issue a transaction to a slave peripheral, but nothing is connected");
return;
}
foreach (var b in Machine.SystemBus.ReadBytes(txTransferAddress.Value, (int)txTransferBufferSize.Value))
{
RegisteredPeripheral.Transmit(b);
}
RegisteredPeripheral.FinishTransmission();
command = Commands.None;
TxIRQ.Blink();
}
private void TryStartReception()
{
if (!rxEnable.Value || command != Commands.ReceiveData)
{
this.Log(LogLevel.Debug, "Tried to issue a transaction without full configuration.");
return;
}
if (RegisteredPeripheral == null)
{
this.Log(LogLevel.Warning, "Trying to issue a transaction to a slave peripheral, but nothing is connected");
return;
}
var receiveQueue = new Queue <byte>();
for (int i = 0; i < (int)rxTransferBufferSize.Value; i++)
{
receiveQueue.Enqueue(RegisteredPeripheral.Transmit(0));
}
RegisteredPeripheral.FinishTransmission();
Machine.SystemBus.WriteBytes(receiveQueue.ToArray(), rxTransferAddress.Value);
receiveQueue.Clear();
command = Commands.None;
RxIRQ.Blink();
}
public MPFS_SPI(Machine machine) : base(machine)
{
locker = new object();
receiveBuffer = new Queue <byte>();
transmitBuffer = new Queue <byte>();
IRQ = new GPIO();
controlRegister = new DoubleWordRegister(this, 0x80000102)
.WithFlag(0, out coreEnabled,
changeCallback: (_, val) =>
{
if (!val)
{
frameCounterLimit.Value = 0;
}
}, name: "ENABLE")
.WithFlag(1, out master, name: "MASTER")
.WithTag("MODE", 2, 2)
.WithFlag(4, out enableIrqOnReceive, name: "INTRXDATA")
.WithFlag(5, out enableIrqOnTransmit, name: "INTTXDATA")
.WithFlag(6, out enableIrqOnOverflow, name: "INTRCVOVFLOW")
.WithFlag(7, out enableIrqOnUnderrun, name: "INTTXTURUN")
.WithValueField(8, 16, out frameCounterLimit,
writeCallback: (_, val) =>
{
framesReceived = 0;
framesTransmitted = 0;
}, name: "FRAMECNT")
.WithTag("SPO", 24, 1)
.WithTag("SPH", 25, 1)
.WithTag("SPS", 26, 1)
.WithTag("FRAMEURUN", 27, 1)
.WithTag("CLKMODE", 28, 1)
.WithFlag(29,
changeCallback: (_, val) =>
{
if (val)
{
if (frameSize.Value <= 8)
{
fifoSize = 32;
}
else if (frameSize.Value >= 9 && frameSize.Value <= 16)
{
fifoSize = 16;
}
else if (frameSize.Value >= 17)
{
fifoSize = 8;
}
}
else
{
fifoSize = 4;
}
}, name: "BIGFIFO")
.WithTag("OENOFF", 30, 1)
.WithFlag(31,
writeCallback: (_, val) =>
{
if (val)
{
Reset();
}
}, name: "RESET");
var registersMap = new Dictionary <long, DoubleWordRegister>
{
{ (long)Registers.Control, controlRegister },
{ (long)Registers.FrameSize, new DoubleWordRegister(this, 0x4)
.WithValueField(0, 6, out frameSize, name: "FRAMESIZE") },
{ (long)Registers.Status, new DoubleWordRegister(this, 0x2440)
.WithFlag(0, out dataSent, FieldMode.Read, name: "TXDATASENT")
.WithFlag(1, out dataReceived, FieldMode.Read, name: "RXDATARCVD")
.WithFlag(2, FieldMode.Read, valueProviderCallback: (_) => receiveOverflow.Value, name: "RXOVERFLOW")
.WithFlag(3, FieldMode.Read, valueProviderCallback: (_) => transmitUnderrun.Value, name: "TXUNDERRUN")
.WithFlag(4, FieldMode.Read, valueProviderCallback: (_) => receiveBuffer.Count == fifoSize, name: "RXFIFOFULL")
.WithFlag(5, FieldMode.Read, valueProviderCallback: (_) => (receiveBuffer.Count + 1) == fifoSize, name: "RXFIFOFULLNEXT")
.WithFlag(6, FieldMode.Read, valueProviderCallback: (_) => receiveBuffer.Count == 0, name: "RXFIFOEMPTY")
.WithFlag(7, FieldMode.Read, valueProviderCallback: (_) => receiveBuffer.Count == 1, name: "RXFIFOEMPTYNEXT")
.WithFlag(8, FieldMode.Read, valueProviderCallback: (_) => transmitBuffer.Count == fifoSize, name: "TXFIFOFULL")
.WithFlag(9, FieldMode.Read, valueProviderCallback: (_) => (transmitBuffer.Count + 1) == fifoSize, name: "TXFIFOFULLNEXT")
.WithFlag(10, FieldMode.Read, valueProviderCallback: (_) => transmitBuffer.Count == 0, name: "TXFIFOEMPTY")
.WithFlag(11, FieldMode.Read, valueProviderCallback: (_) => transmitBuffer.Count == 1, name: "TXFIFOEMPTYNEXT")
.WithTag("FRAMESTART", 12, 1)
.WithTag("SSEL", 13, 1)
.WithTag("ACTIVE", 14, 1) },
{ (long)Registers.InterruptClear, new DoubleWordRegister(this)
.WithFlag(0, FieldMode.WriteOneToClear,
writeCallback: (_, val) =>
{
if (val)
{
transmitDone.Value = false;
}
}, name: "TXDONE")
.WithFlag(1, FieldMode.WriteOneToClear,
writeCallback: (_, val) =>
{
if (val)
{
receiveDone.Value = false;
}
}, name: "RXDONE")
.WithFlag(2, FieldMode.WriteOneToClear,
writeCallback: (_, val) =>
{
if (val)
{
receiveOverflow.Value = false;
}
}, name: "RXOVERFLOW")
.WithFlag(3, FieldMode.WriteOneToClear,
writeCallback: (_, val) =>
{
if (val)
{
transmitUnderrun.Value = false;
}
}, name: "TXUNDERRUN")
.WithFlag(4, FieldMode.WriteOneToClear,
writeCallback: (_, val) =>
{
if (val)
{
fullCommandReceived.Value = false;
}
}, name: "CMDINT")
.WithFlag(5, FieldMode.WriteOneToClear,
writeCallback: (_, val) =>
{
if (val)
{
slaveSelectGoneInactve.Value = false;
}
}, name: "SSEND") },
{ (long)Registers.ReceiveData, new DoubleWordRegister(this)
.WithValueField(0, 32, FieldMode.Read,
valueProviderCallback: _ =>
{
dataReceived.Value = false;
return(receiveBuffer.Count > 0 ? receiveBuffer.Dequeue() : (byte)0x00);
}, name: "RXDATA") },
{ (long)Registers.TransmitData, new DoubleWordRegister(this)
.WithValueField(0, 32, FieldMode.Write,
writeCallback: (_, val) =>
{
if (coreEnabled.Value)
{
dataSent.Value = false;
if (master.Value == true)
{
this.Log(LogLevel.Noisy, $"Writing 0x{val:X} to slave.");
//TODO: should probably enqueue data if frame counter is enabled and the frameTransmitted reached the threshold.
// We do not handle TXFIFO as its handling is not clear from the documentation.
TryReceive(RegisteredPeripheral.Transmit((byte)val));
if (framesReceived + framesTransmitted == frameCounterLimit.Value)
{
dataSent.Value = true;
transmitDone.Value = true;
if (slaveSelect.Value > 0)
{
RegisteredPeripheral.FinishTransmission();
}
}
}
else
{
this.Log(LogLevel.Noisy, $"Writing 0x{val:X} to transmit buffer in slave mode.");
transmitBuffer.Enqueue((byte)val);
}
}
}, name: "TXDATA") },
{ (long)Registers.ClockRate, new DoubleWordRegister(this)
.WithValueField(0, 8, name: "CLKRATE") },
{ (long)Registers.SlaveSelect, new DoubleWordRegister(this)
.WithValueField(0, 8, out slaveSelect,
writeCallback: (_, val) =>
{
if (val > 0)
{
slaveSelect.Value = val;
framesReceived = 0;
framesTransmitted = 0;
}
else if (val == 0 && slaveSelect.Value > 0)
{
slaveSelect.Value = 0;
RegisteredPeripheral.FinishTransmission();
}
}, name: "SSEL") },
{ (long)Registers.InterruptMasked, new DoubleWordRegister(this)
.WithValueField(0, 6, valueProviderCallback: _ => CalculateMaskedInterruptValue()) },
{ (long)Registers.InterruptRaw, new DoubleWordRegister(this)
.WithFlag(0, out transmitDone, name: "TXDONE")
.WithFlag(1, out receiveDone, name: "RXDONE")
.WithFlag(2, out receiveOverflow, name: "RXOVERFLOW")
.WithFlag(3, out transmitUnderrun, name: "TXUNDERRUN")
.WithFlag(4, out fullCommandReceived, name: "CMDINT")
.WithFlag(5, out slaveSelectGoneInactve, name: "SSEND") },
{ (long)Registers.ControlBitsForEnhancedModes, new DoubleWordRegister(this)
.WithTag("AUTOSTATUS", 0, 1)
.WithTag("AUTOPOLL", 1, 1)
.WithFlag(2, out disableFrameCount, name: "DISFRMCNT")
// bit 3 reserved
.WithFlag(4, out enableIrqOnCmd, name: "INTEN_CMD")
.WithFlag(5, out enableIrqOnSsend, name: "INTEN_SSEND") },
{ (long)Registers.CommandRegister, new DoubleWordRegister(this)
.WithFlag(0, FieldMode.Read,
writeCallback: (_, val) =>
{
if (val)
{
while (transmitBuffer.Count < fifoSize)
{
transmitBuffer.Enqueue(0);
}
}
}, name: "AUTOFILL")
.WithTag("AUTOEMPTY", 1, 1)
.WithFlag(2, FieldMode.Read,
writeCallback: (_, val) =>
{
if (val)
{
receiveBuffer.Clear();
}
}, name: "RXFIFORST")
.WithFlag(3, FieldMode.Read,
writeCallback: (_, val) =>
{
if (val)
{
transmitBuffer.Clear();
}
}, name: "TXFIFORST")
.WithFlag(4, FieldMode.Read,
writeCallback: (_, val) =>
{
if (val)
{
frameCounterLimit.Value = 0;
framesTransmitted = 0;
framesReceived = 0;
}
}, name: "CLRFRAMECNT")
.WithTag("AUTOSTALL", 5, 1)
.WithTag("TXNOW", 6, 1) },
{ (long)Registers.CommandSize, new DoubleWordRegister(this)
.WithValueField(0, 6, out commandSize, name: "CMDSIZE") },
{ (long)Registers.SlaveHardwareStatus, new DoubleWordRegister(this)
.WithValueField(0, 8, FieldMode.Read, valueProviderCallback: (_) => CalculateSlaveHardwareStatus(), name: "HWSTATUS") },
{ (long)Registers.Status8, new DoubleWordRegister(this)
.WithTag("FIRSTFRAME", 0, 1)
.WithFlag(1, FieldMode.Read, valueProviderCallback: (_) => dataSent.Value && dataReceived.Value, name: "DONE")
.WithFlag(2, FieldMode.Read, valueProviderCallback: (_) => receiveBuffer.Count == 0, name: "RXEMPTY")
.WithFlag(3, FieldMode.Read, valueProviderCallback: (_) => transmitBuffer.Count == fifoSize, name: "TXFULL")
.WithFlag(4, FieldMode.Read, valueProviderCallback: (_) => receiveOverflow.Value, name: "RXOVFLOW")
.WithFlag(5, FieldMode.Read, valueProviderCallback: (_) => transmitUnderrun.Value, name: "TXUNDERRUN")
.WithFlag(6, FieldMode.Read, valueProviderCallback: (_) => slaveSelect.Value > 0, name: "SSEL")
.WithTag("ACTIVE", 7, 1) },
{ (long)Registers.AliasedControlRegister0, new DoubleWordRegister(this)
.WithValueField(0, 8,
writeCallback: (_, newVal) => controlRegister.Write(0, BitHelper.SetBitsFrom(controlRegister.Value, newVal, 0, 8)),
valueProviderCallback: (_) => BitHelper.GetMaskedValue(controlRegister.Value, 0, 8), name: "CTRL0") },
{ (long)Registers.AliasedControlRegister1, new DoubleWordRegister(this)
.WithValueField(0, 8,
writeCallback: (_, newVal) => controlRegister.Write(0, BitHelper.SetBitsFrom(controlRegister.Value, newVal, 8, 8)),
valueProviderCallback: (_) => BitHelper.GetMaskedValue(controlRegister.Value, 8, 8), name: "CTRL1") },
{ (long)Registers.AliasedControlRegister2, new DoubleWordRegister(this)
.WithValueField(0, 8,
writeCallback: (_, newVal) => controlRegister.Write(0, BitHelper.SetBitsFrom(controlRegister.Value, newVal, 16, 8)),
valueProviderCallback: (_) => BitHelper.GetMaskedValue(controlRegister.Value, 16, 8), name: "CTRL2") },
{ (long)Registers.AliasedControlRegister3, new DoubleWordRegister(this)
.WithValueField(0, 8,
writeCallback: (_, newVal) => controlRegister.Write(0, BitHelper.SetBitsFrom(controlRegister.Value, newVal, 24, 8)),
valueProviderCallback: (_) => BitHelper.GetMaskedValue(controlRegister.Value, 24, 8), name: "CTRL3") }
};
registers = new DoubleWordRegisterCollection(this, registersMap);
}