public Pca9685Device(int busNumber, byte chipNumber, int?clockSpeed,
I2cBusSpeed speed = I2cBusSpeed.FastMode, I2cSharingMode sharingMode = I2cSharingMode.Exclusive)
{
// Validate
if (clockSpeed.HasValue && (clockSpeed == 0 || clockSpeed.Value > ClockSpeedMaximum))
{
throw new ArgumentOutOfRangeException(nameof(clockSpeed));
}
// Get address
var address = GetI2cAddress(chipNumber);
// Connect to hardware
_hardware = I2cExtensions.Connect(busNumber, address, speed, sharingMode);
// Initialize configuration
ClockIsExternal = clockSpeed.HasValue;
ClockSpeed = clockSpeed ?? InternalClockSpeed;
FrequencyDefault = CalculateFrequency(PrescaleDefault, ClockSpeed);
FrequencyMinimum = CalculateFrequency(PrescaleMaximum, ClockSpeed); // Inverse relationship (max = min)
FrequencyMaximum = CalculateFrequency(PrescaleMinimum, ClockSpeed); // Inverse relationship (min = max)
// Build channels
_channels = new Collection <Pca9685ChannelValue>();
Channels = new ReadOnlyCollection <Pca9685ChannelValue>(_channels);
for (var index = 0; index < ChannelCount; index++)
{
_channels.Add(new Pca9685ChannelValue(index));
}
// Set "all call" address
I2cExtensions.WriteJoinByte(_hardware, (byte)Pca9685Register.AllCall, I2cAllCallAddress);
// Enable auto-increment and "all call"
I2cExtensions.WriteReadWriteBit(_hardware, (byte)Pca9685Register.Mode1,
(byte)(Pca9685Mode1Bits.AutoIncrement | Pca9685Mode1Bits.AllCall), true);
// Read current values and update properties
ReadAll();
}
/// <summary>
/// Leaves sleep mode.
/// </summary>
/// <remarks>
/// Clears the <see cref="Pca9685Register.Mode1"/> register <see cref="Pca9685Mode1Bits.Sleep"/> bit
/// then waits for <see cref="ModeSwitchDelay"/> to allow the oscillator to start.
/// </remarks>
/// <returns>
/// True when mode was changed, false when not sleeping.
/// </returns>
public bool Wake()
{
// Read sleep bit (do nothing when already sleeping)
var sleeping = I2cExtensions.WriteReadBit(_hardware, (byte)Pca9685Register.Mode1, (byte)Pca9685Mode1Bits.Sleep);
if (!sleeping)
{
return(false);
}
// Clear sleep bit
I2cExtensions.WriteReadWriteBit(_hardware, (byte)Pca9685Register.Mode1, (byte)Pca9685Mode1Bits.Sleep, false);
// Wait for completion
Task.Delay(ModeSwitchDelay).Wait();
// Update related properties
ReadMode1();
// Return changed
return(true);
}
