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using System;
using Microsoft.SPOT;
// Seven Segment Display Utilities
// Matt Isenhower, Komodex Systems LLC
// http://komodex.com
//
// This class contains some sample code for use with the Seven Segment Display Module.
// Feel free to modify this code or include it in your own programs.
namespace Komodex.NETMF
{
public static class SevenSegmentDisplayUtilities
{
#region Temperature Display
/// <summary>
/// Sets the value on the display to the specified temperature value.
/// </summary>
/// <param name="display">The SevenSegmentDisplay instance to be updated.</param>
/// <param name="temperature">The temperature to be displayed.</param>
/// <param name="unit">The temperature unit to display (usually Digit.F or Digit.C).</param>
/// <param name="showDecimal">true to display the temperature with a decimal point (e.g., "98.6"); otherwise, false (e.g., "98").</param>
/// <returns>true if the display was updated successfully; otherwise, false.</returns>
public static bool SetTemperatureDisplay(this SevenSegmentDisplay display, double temperature, Digit unit, bool showDecimal = true)
{
// Check input
if (temperature > 999 || temperature < -99)
throw new ArgumentOutOfRangeException("temperature");
bool isNegative = (temperature < 0);
// Determine if we should show a decimal place
bool isDecimal = false;
if (showDecimal && temperature > -10 && temperature < 100)
{
temperature *= 10;
isDecimal = true;
}
// Get the value to be displayed
int value = System.Math.Abs((int)temperature);
// Get the Digit values for each number
Digit d1, d2, d3;
d3 = SevenSegmentDisplay.GetDigit(value % 10);
value /= 10;
d2 = SevenSegmentDisplay.GetDigit(value % 10);
value /= 10;
d1 = SevenSegmentDisplay.GetDigit(value % 10);
// Add the decimal point if necessary
if (isDecimal)
d2 |= Digit.Decimal;
// Add the negative sign if necessary and clear leading zeros
if (isNegative)
{
d1 = Digit.Dash;
if (d2 == Digit.D0)
d2 = Digit.Blank;
}
else if (d1 == Digit.D0)
{
d1 = Digit.Blank;
if (d2 == Digit.D0)
d2 = Digit.Blank;
}
bool success = true;
// Send the value to the display
if (!display.SetValue(d1, d2, d3, unit))
success = false;
// Turn the apostrophe on (so it looks like a degree symbol) and make sure the colon is turned off
if (!display.SetApostrophe(true))
success = false;
if (!display.SetColon(false))
success = false;
return success;
}
#endregion
}
}
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