/// <summary>
/// Writes the specified data.
/// </summary>
/// <param name="channel">The channel.</param>
/// <param name="data">The data.</param>
public void Write(Mcp4822Channel channel, AnalogValue data)
{
using (spiConnection.SelectSlave())
{
var value = (uint)(data.Relative * 0xFFF);
if (value > 0xFFF)
{
value = 0xFFF;
}
// Set active channel
spiConnection.Write(channel == Mcp4822Channel.ChannelB);
// Ignored bit
spiConnection.Synchronize();
// Select 1x Gain
spiConnection.Write(true);
// Active mode operation
spiConnection.Write(true);
// Write 12 bits data (some lower bits are ignored by MCP4802/4812
spiConnection.Write(value, 12);
}
}
/// <summary>
/// Reads the specified channel.
/// </summary>
/// <param name="channel">The channel.</param>
/// <returns>The value</returns>
public AnalogValue Read(Mcp3208Channel channel)
{
using (spiConnection.SelectSlave())
{
// Start bit
spiConnection.Write(true);
// Channel is single-ended
spiConnection.Write(true);
spiConnection.Write((byte)channel, 3);
// Let one clock to sample
spiConnection.Synchronize();
// Read 12 bits
var data = (int)spiConnection.Read(12);
return(new AnalogValue(data, 0xFFF));
}
}
public decimal Read(Mcp3008Channel channel)
{
using (spiConnection.SelectSlave())
{
// Start bit
spiConnection.Write(true);
// Channel is single-ended
spiConnection.Write(true);
// Channel Id
spiConnection.Write((byte)channel, 3);
// Let one clock to sample
spiConnection.Synchronize();
// Read 10 bits
var data = spiConnection.Read(10);
return(data * scale / 1024m);
}
}