public LiteX_I2C_Zephyr(Machine machine) : base(machine)
{
// 0 - clock, 1 - data
i2cDecoder = new BitPatternDetector(new [] { true, true }, this);
i2cDecoder.RegisterPatternHandler((prev, curr) => !prev[ClockSignal] && curr[ClockSignal], name: "clockRising", action: HandleClockRising);
i2cDecoder.RegisterPatternHandler((prev, curr) => prev[ClockSignal] && !curr[ClockSignal], name: "clockFalling", action: HandleClockFalling);
i2cDecoder.RegisterPatternHandler((prev, curr) => prev[ClockSignal] && curr[ClockSignal] && prev[DataSignal] && !curr[DataSignal], name: "start", action: HandleStartCondition);
i2cDecoder.RegisterPatternHandler((prev, curr) => prev[ClockSignal] && curr[ClockSignal] && !prev[DataSignal] && curr[DataSignal], name: "stop", action: HandleStopCondition);
var registers = new Dictionary <long, DoubleWordRegister>
{
{ (long)Registers.BitBang, new DoubleWordRegister(this, 0x5) // SCL && SDA are high by default
.WithFlag(0, out var clockSignal, name: "SCL")
.WithFlag(1, out var directionSignal, name: "OE")
.WithFlag(2, out var dataSignal, name: "SDA")
.WithWriteCallback((_, val) => i2cDecoder.AcceptState(new [] { clockSignal.Value, dataSignal.Value })) },
public LiteX_I2C_Zephyr(Machine machine) : base(machine)
{
// 0 - clock, 1 - data
i2cDecoder = new BitPatternDetector(new [] { true, true }, this);
i2cDecoder.RegisterPatternHandler((prev, curr) => !prev[ClockSignal] && curr[ClockSignal], name: "clockRising", action: HandleClockRising);
i2cDecoder.RegisterPatternHandler((prev, curr) => prev[ClockSignal] && !curr[ClockSignal], name: "clockFalling", action: HandleClockFalling);
i2cDecoder.RegisterPatternHandler((prev, curr) => prev[ClockSignal] && curr[ClockSignal] && prev[DataSignal] && !curr[DataSignal], name: "start", action: HandleStartCondition);
i2cDecoder.RegisterPatternHandler((prev, curr) => prev[ClockSignal] && curr[ClockSignal] && !prev[DataSignal] && curr[DataSignal], name: "stop", action: HandleStopCondition);
IFlagRegisterField clockSignal, directionSignal, dataSignal;
var registers = new Dictionary <long, DoubleWordRegister>
{
{ (long)Registers.BitBang, new DoubleWordRegister(this, 0x5) // SCL && SDA are high by default
.WithFlag(0, out clockSignal, name: "SCL")
.WithFlag(1, out directionSignal, name: "OE")
.WithFlag(2, out dataSignal, name: "SDA")
.WithWriteCallback((_, val) => i2cDecoder.AcceptState(new [] { clockSignal.Value, dataSignal.Value })) },
{ (long)Registers.Data, new DoubleWordRegister(this)
.WithFlag(0, FieldMode.Read, valueProviderCallback: _ =>
{
if (directionSignal.Value)
{
this.Log(LogLevel.Warning, "Trying to read data, but the direction signal is set to OUTPUT");
return(true);
}
if (bufferFromDevice.Count == 0)
{
this.Log(LogLevel.Noisy, "There are no more output bits to read");
// SDA is high when no data
return(true);
}
return(bufferFromDevice.Peek());
}) },
};
bufferFromDevice = new Queue <bool>();
bufferToDevice = new Stack <bool>();
bytesToDevice = new Queue <byte>();
registersCollection = new DoubleWordRegisterCollection(this, registers);
Reset();
}