| public static getDoubleFromString ( String val ) : double? | ||
| val | String | The string representing a double |
| return | double? | |
private void frequencyChangedHandler(Object sender, EventArgs e)
{
float multiplier = 1;
double freq = 0;
double?fVal;
// get the frequency multiplier
switch (fUnitsBox.Text)
{
case "Hz":
multiplier = 1;
break;
case "KHz":
multiplier = 1000;
break;
default:
MessageBox.Show("Unknown frequency units: " + fUnitsBox.Text);
return;
}
// Check if the frequency is a valid number
fVal = Utils.getDoubleFromString(frequencyBox.Text);
if (fVal == null)
{
frequencyBox.BackColor = Color.Salmon;
return;
}
else
{
frequencyBox.BackColor = Color.Empty;
}
// Check if the frequency is between 1Hz and 1 MHz
freq = fVal.Value * multiplier;
if ((freq < 1) || (freq > 1000000))
{
frequencyBox.BackColor = Color.Salmon;
return;
}
else
{
frequencyBox.BackColor = Color.Empty;
synchronousPwmFrequency = (int)freq;
for (int i = 0; i < 8; i++)
{
channelControls[i].setNewFrequency((int)freq, fUnitsBox.Text);
}
}
}
/// <summary>
/// Recalculates and checks the dutycycle value
/// </summary>
private Boolean recalculateDutyCycle()
{
Boolean retVal = false;
double? rawVal = Utils.getDoubleFromString(dutyCycleBox.Text);
double maxDc = 0;
double tmpVal = 0;
if (rawVal != null)
{
if (rawVal.Value >= 0)
{
switch (dcUnitsBox.Text)
{
case "%":
if (rawVal.Value <= 100)
{
tmpVal = ((1f / tmpFrequency) / 100f) * rawVal.Value;
dutyCycleBox.BackColor = Color.Empty;
retVal = true;
}
else
{
dutyCycleBox.BackColor = Color.Salmon;
}
break;
case "us":
tmpVal = rawVal.Value / 1000000;
dutyCycleBox.BackColor = Color.Empty;
break;
case "ms":
tmpVal = rawVal.Value / 1000;
dutyCycleBox.BackColor = Color.Empty;
break;
default:
throw new Exception("Unknown unit selected for dutycycle");
}
//Check if the dutycycle doesn't exeed the frequency period time
maxDc = 1f / tmpFrequency;
if (tmpVal > maxDc)
{
dutyCycleBox.BackColor = Color.Salmon;
retVal = false;
}
else
{
retVal = true;
setTmpDc(tmpVal);
updateSliderPosition();
}
}
else
{
dutyCycleBox.BackColor = Color.Salmon;
}
}
else
{
dutyCycleBox.BackColor = Color.Salmon;
}
return(retVal);
}