public static async Task ScrollString(this DisplayDriver driver, string str, int duration)
{
var displayString = DisplayFrame.GetString(str).ToArray();
int scrollInterval = duration / (displayString.Length + 6);
// Start with a blank frame
var frame = DisplayFrame.Empty;
driver.WriteFrame(frame);
await Task.Delay(scrollInterval);
// Push each character in from the right, one at a time
foreach (var c in displayString)
{
frame = frame.WithPushedCharacter(c);
driver.WriteFrame(frame);
await Task.Delay(scrollInterval);
}
// Push three more blank characters to end off with a blank screen
for (int i = 0; i < 3; i++)
{
frame = frame.WithPushedCharacter(DisplayCharacter.Empty);
driver.WriteFrame(frame);
await Task.Delay(scrollInterval);
}
}
public static DisplayFrame FromDecimal(decimal value, StatusLed signLed)
{
if (value < MinDecimalValue || value > MaxDecimalValue)
{
throw new ArgumentOutOfRangeException(nameof(value));
}
bool sign = value < 0m;
value = Math.Abs(value);
int integerDigits = value.NumIntegerDigits();
int fractionalDigits = value.NumFractionalDigits();
int totalDigits = integerDigits + fractionalDigits;
if (totalDigits > CharacterCount)
{
value = Decimal.Round(value, CharacterCount - integerDigits);
totalDigits = CharacterCount;
fractionalDigits = totalDigits - integerDigits;
}
var frame = new DisplayFrame();
for (int i = 0; i < integerDigits; i++)
{
bool dot = (i == integerDigits - 1) && (fractionalDigits > 0);
var character = DisplayCharacter.FromDigit(value.GetDigit(integerDigits - i - 1), dot);
frame = frame.WithCharacter(totalDigits - i - 1, character);
}
for (int i = 0; i < fractionalDigits; i++)
{
var character = DisplayCharacter.FromDigit(value.GetDigit(-i - 1));
frame = frame.WithCharacter(fractionalDigits - i - 1, character);
}
if (sign)
{
if (totalDigits == CharacterCount)
{
frame = frame.WithStatus(signLed, true);
}
else
{
var character = DisplayCharacter.FromSymbol('-');
frame = frame.WithCharacter(totalDigits, character);
}
}
return(frame);
}
public void WriteFrame(DisplayFrame frame)
{
frame.ThrowIfNull(nameof(frame));
foreach (var character in frame.Characters)
{
LedDriver.WriteByte(character.Value);
}
for (int i = 0; i < 5; i++)
{
LedDriver.WriteBit(false);
}
LedDriver.WriteBit(frame.StatusLeds[StatusLed.Green]);
LedDriver.WriteBit(frame.StatusLeds[StatusLed.Blue]);
LedDriver.WriteBit(frame.StatusLeds[StatusLed.Red]);
LedDriver.Latch();
}
static DisplayFrame()
{
Full = new DisplayFrame(DisplayCharacter.Full, true);
Empty = new DisplayFrame(DisplayCharacter.Empty, false);
}
public static void WriteDecimal(this DisplayDriver driver, decimal value, StatusLed signLed = StatusLed.Blue)
{
driver.WriteFrame(DisplayFrame.FromDecimal(value, signLed));
}
public static void WriteString(this DisplayDriver driver, string str)
{
driver.WriteFrame(DisplayFrame.FromString(str));
}
