Piccolo esempio per controllare un striscia led RGB via USB, utilizzando la scheda DigiSpark.

In questo esempio vado a rappresentare sulla striscia LED lo stato degli HD , della CPU, della LAN e della batteria del mio NoteBook.

Questo pregetto avra una parte di codice scritta in Arduino e una in Visual Studio Visual Basic.

Su GIT

Materiale usato :

• 1 - DigiUSB (wiki)
• 1 - Striscia LED WS2811 (Amazon)
• Vari cavetti

Galleria :

Codice lato DigiUSB:

#define USB_CFG_DEVICE_NAME     'H','D','D','L','e','d'
#define USB_CFG_DEVICE_NAME_LEN 6

#include <DigiUSB.h>
#include <WS2811.h>

#define MAX_LED 20

DEFINE_WS2811_FN(WS2811RGB, PORTB, 1)
RGB_t rgb[MAX_LED]; //1 for 1 pixel

byte byteCNT = 0;
byte byteLID = 0;
byte byteVAR = 0;
byte byteVAG = 0;
byte byteVAB = 0;

void erasePixel(){
  for (byte i=0;i<MAX_LED;i++) {
    setPixel(i+1,0,0,0);
  }
}

void setPixel(byte i, byte r, byte g, byte b){
	rgb[i - 1].r=r;
  rgb[i - 1].g=g;
  rgb[i - 1].b=b;
}

void updatePixels(){
	WS2811RGB(rgb, ARRAYLEN(rgb));
}

void setup() {
  DigiUSB.begin();
  pinMode(1, OUTPUT); //LED on Model A  or Pro
  erasePixel();
}

void loop() {
  if (DigiUSB.available()) {
    boolean toComplete = false;
    byte lr = DigiUSB.read();
    DigiUSB.write(lr);
    
    switch (byteCNT){
      case 0:
        byteLID = lr;
        if (byteLID == 0 || byteLID > MAX_LED) {
          erasePixel();
          toComplete = true;

        } else {
          byteCNT ++;

        }

      break;
      case 1:
        byteVAR = lr;
        byteCNT ++;      

      break;
      case 2:
        byteVAG = lr;
        byteCNT ++;      

      break;
      case 3:
        byteVAB = lr;
        setPixel(byteLID, byteVAR, byteVAG, byteVAB);
        toComplete = true;

      break;
    }

    if(toComplete){
      updatePixels();

      byteCNT = 0;      
      byteLID = 0;
      byteVAR = 0;
      byteVAG = 0;
      byteVAB = 0;
    }

  } else {
    DigiUSB.delay(10);

  }

}

Codice lato Visual Studio (sorgenti):

Imports System
Imports LibUsbDotNet
Imports LibUsbDotNet.Info
Imports LibUsbDotNet.Main
Imports System.Collections.ObjectModel
Imports System.Text
Imports System.Text.RegularExpressions
Imports System.ComponentModel

Public Class frmMain
    Dim MyUsbDevice As UsbDevice = Nothing

    Public Class clsDriver

        Dim PerformanceCounterLetturaSec As PerformanceCounter
        Dim PerformanceCounterScritturaSec As PerformanceCounter

        Public Leggi As Boolean = False
        Public Scrivi As Boolean = False

        Public Lettura As Single = 0
        Public Scrittura As Single = 0

        Public IName As String = String.Empty

        Public Control As urcLed = Nothing

        Public Tipo As enmTipo = enmTipo.none

        Public Enum enmTipo
            none
            Drive
            Lan
            CPU
            Battery
        End Enum

        Public Sub New(strIName As String, entTipo As enmTipo)
            IName = strIName
            Tipo = entTipo

            Select Case Tipo
                Case enmTipo.Battery
                    '

                Case Else
                    PerformanceCounterLetturaSec = New PerformanceCounter()
                    CType(PerformanceCounterLetturaSec, ISupportInitialize).BeginInit()

                    Select Case Tipo
                        Case enmTipo.Drive
                            PerformanceCounterLetturaSec.CategoryName = "Disco logico"
                            PerformanceCounterLetturaSec.CounterName = "Letture disco/sec"

                        Case enmTipo.Lan
                            PerformanceCounterLetturaSec.CategoryName = "Interfaccia di rete"
                            PerformanceCounterLetturaSec.CounterName = "Byte ricevuti/sec"

                        Case enmTipo.CPU
                            PerformanceCounterLetturaSec.CategoryName = "Processore"
                            PerformanceCounterLetturaSec.CounterName = "% Tempo processore"

                    End Select

                    PerformanceCounterLetturaSec.MachineName = "."
                    PerformanceCounterLetturaSec.InstanceName = IName
                    CType(PerformanceCounterLetturaSec, ISupportInitialize).EndInit()

                    PerformanceCounterScritturaSec = New PerformanceCounter()
                    CType(PerformanceCounterScritturaSec, ISupportInitialize).BeginInit()

                    Select Case Tipo
                        Case enmTipo.Drive
                            PerformanceCounterScritturaSec.CategoryName = "Disco logico"
                            PerformanceCounterScritturaSec.CounterName = "Scritture disco/sec"

                        Case enmTipo.Lan
                            PerformanceCounterScritturaSec.CategoryName = "Interfaccia di rete"
                            PerformanceCounterScritturaSec.CounterName = "Byte inviati/sec"

                        Case enmTipo.CPU
                            PerformanceCounterScritturaSec.CategoryName = "Processore"
                            PerformanceCounterScritturaSec.CounterName = "% Tempo processore" ' "% Tempo inattività"

                    End Select

                    PerformanceCounterScritturaSec.MachineName = "."
                    PerformanceCounterScritturaSec.InstanceName = IName
                    CType(PerformanceCounterScritturaSec, ISupportInitialize).EndInit()

            End Select

        End Sub

        Public Sub update()
            Try
                Select Case Tipo
                    Case enmTipo.Battery
                        Lettura = 0
                        Scrittura = 0

                        If SystemInformation.PowerStatus.PowerLineStatus = PowerLineStatus.Online Then
                            Lettura = SystemInformation.PowerStatus.BatteryLifePercent * 100

                        ElseIf SystemInformation.PowerStatus.PowerLineStatus = PowerLineStatus.Offline Then
                            Scrittura = SystemInformation.PowerStatus.BatteryLifePercent * 100

                        End If

                    Case Else
                        Lettura = CSng(Math.Round(Math.Max(Lettura, PerformanceCounterLetturaSec.NextValue), 1))
                        Scrittura = CSng(Math.Round(Math.Max(Scrittura, PerformanceCounterScritturaSec.NextValue), 1))

                End Select

            Catch ex As Exception
                Throw

            End Try

            Leggi = Leggi OrElse Lettura > 0
            Scrivi = Scrivi OrElse Scrittura > 0

        End Sub

        Public Sub show(Luminosita As Integer)

            Control.SuspendLayout()
            Control.LabelCaption.SuspendLayout()
            Control.LabelLeggi.SuspendLayout()
            Control.LabelScrivi.SuspendLayout()

            Control.BackColor = Color.FromArgb(255, If(Not Leggi AndAlso Scrivi, Luminosita, 0), If(Leggi AndAlso Not Scrivi, Luminosita, 0), If(Leggi AndAlso Scrivi, Luminosita, 0))
            Control.LabelCaption.Text = IName

            Dim strLeggi As String = String.Empty
            Dim strScrivi As String = String.Empty

            Select Case Tipo
                Case enmTipo.Drive
                    strLeggi = "L : " & Lettura.ToString
                    strScrivi = "S : " & Scrittura.ToString

                Case enmTipo.Lan
                    strLeggi = "D : " & Lettura.ToString
                    strScrivi = "U : " & Scrittura.ToString

                Case enmTipo.CPU
                    strLeggi = Lettura.ToString & " %"

                    Dim l As Integer = CInt((Luminosita * Lettura) / 100)

                    Control.BackColor = Color.FromArgb(255, l, l, l)
                    Control.LabelCaption.Text = "CPU"

                Case enmTipo.Battery
                    If Lettura Then
                        strLeggi = Lettura.ToString & " %"
                    End If
                    If Scrivi Then
                        strLeggi = Scrittura.ToString & " %"
                    End If

            End Select

            Control.LabelCaption.ForeColor = ColorInverter(Control.BackColor)
            Control.LabelCaption.BackColor = Control.BackColor

            Control.LabelLeggi.ForeColor = ColorInverter(Control.BackColor)
            Control.LabelLeggi.BackColor = Control.BackColor

            Control.LabelScrivi.ForeColor = ColorInverter(Control.BackColor)
            Control.LabelScrivi.BackColor = Control.BackColor

            Control.LabelLeggi.Text = strLeggi
            Control.LabelScrivi.Text = strScrivi

            Control.LabelScrivi.ResumeLayout()
            Control.LabelLeggi.ResumeLayout()
            Control.LabelCaption.ResumeLayout()
            Control.ResumeLayout()

            Control.Refresh()

            My.Application.DoEvents()

        End Sub

        Public Sub reset()
            Leggi = False
            Scrivi = False
            Lettura = 0
            Scrittura = 0

        End Sub

        Private Function ColorInverter(ColorX As Color) As Color
            Dim clrX As Color = Color.FromArgb(ColorX.A, InCo(ColorX.R), InCo(ColorX.G), InCo(ColorX.B))

            If Math.Max(clrX.ToArgb(), ColorX.ToArgb()) - Math.Min(clrX.ToArgb(), ColorX.ToArgb()) < 197380 Then
                clrX = Color.Black

            End If

            Return clrX
        End Function

        Private Function InCo(ByVal intX As Integer) As Integer
            Return 127 + (128 - intX)
        End Function

        Public Overrides Function Equals(obj As Object) As Boolean
            If obj Is Nothing OrElse Not Me.GetType().Equals(obj.GetType()) Then
                Return False

            Else
                Return IName.Equals(DirectCast(obj, clsDriver).IName)

            End If

        End Function

    End Class

    Dim lstDrivers As List(Of clsDriver)

    Private Sub TimerLeggiValori_Tick(sender As Object, e As EventArgs) Handles TimerLeggiValori.Tick

        For intX As Integer = 0 To lstDrivers.Count - 1
            Try
                lstDrivers(intX).update()

            Catch ex As Exception
                addListi("Removed " & lstDrivers(intX).IName & " " & ex.Message)

                If lstDrivers(intX).Tipo = clsDriver.enmTipo.Lan Then
                    lstLan.Add(lstDrivers(intX).IName)

                End If

                FlowLayoutPanelLeds.Controls.Remove(lstDrivers(intX).Control)
                lstDrivers.RemoveAt(intX)
                Exit For

            End Try

        Next

    End Sub

    Dim drcW As Integer = 80
    Dim drcH As Integer = drcW

    Private Sub Me_Load(sender As Object, e As EventArgs) Handles Me.Load

        TrackBarLuminosita.Width = 0

        FlowLayoutPanelLeds.Width = 0
        FlowLayoutPanelLeds.Height = 0

        ListBoxLog.Width = 0
        ListBoxLog.Height = 0
        ListBoxLog.Items.Clear()

        TrackBarLeggi.Value = My.Settings.Leggi
        TrackBarScrivi.Value = My.Settings.Scrivi
        TrackBarLuminosita.Value = My.Settings.Luminosita

        TrackBarLeggi_Scroll(TrackBarLeggi, New EventArgs)
        TrackBarScrivi_Scroll(TrackBarScrivi, New EventArgs)
        TrackBarLuminosita_Scroll(TrackBarLuminosita, New EventArgs)

        lstDrivers = New List(Of clsDriver) From {
            New clsDriver("_Total", clsDriver.enmTipo.CPU) With {.Control = New urcLed() With {.BorderStyle = BorderStyle.FixedSingle, .Width = drcW, .Height = drcH}},
            New clsDriver("Battery", clsDriver.enmTipo.Battery) With {.Control = New urcLed() With {.BorderStyle = BorderStyle.FixedSingle, .Width = drcW, .Height = drcH}}
        }

        TimerDriver_Tick(TimerDriver, New EventArgs)

        ConnettiUsbDevice()

        TimerLeggiValori.Interval = TrackBarLeggi.Value
        TimerLeggiValori.Enabled = True
        TimerDriver.Enabled = True

    End Sub

    Public Sub ConnettiUsbDevice()
        Try
            DisconnettiUsbDevice()

            MyUsbDevice = UsbDevice.OpenUsbDevice(New UsbDeviceFinder(&H16C0, &H5DF))

            If MyUsbDevice Is Nothing Then
                addListi("Device Not Found.")
                MyUsbDevice = Nothing

            Else
                addListi("Device Found.")

                If MyUsbDevice.Open() Then
                    addListi("Device Open.")
                    TimerScriviValori.Interval = TrackBarScrivi.Value
                    TimerScriviValori.Enabled = True

                Else
                    addListi("Device Not Open.")
                    MyUsbDevice = Nothing

                End If

            End If

        Catch ex As Exception
            addListi(ex.Message)

        End Try

    End Sub

    Public Sub DisconnettiUsbDevice()
        If MyUsbDevice IsNot Nothing Then
            If MyUsbDevice.IsOpen Then
                MyUsbDevice.Close()
                addListi("Device Close.")

            End If
            'MyUsbDevice = Nothing

            UsbDevice.[Exit]()

        End If

    End Sub

    Public Sub addListi(testo As String)
        For Each strX As String In testo.Replace(vbLf, String.Empty).Split(Chr(13))
            ListBoxLog.SelectedIndex = ListBoxLog.Items.Add(strX)

        Next

        Do While ListBoxLog.Items.Count > 10
            ListBoxLog.Items.RemoveAt(0)

        Loop

    End Sub

    Private Sub Me_Closing(sender As Object, e As CancelEventArgs) Handles Me.Closing
        My.Settings.Leggi = TrackBarLeggi.Value
        My.Settings.Scrivi = TrackBarScrivi.Value
        My.Settings.Luminosita = TrackBarLuminosita.Value

        My.Settings.Save()

        TimerDriver.Enabled = False
        TimerLeggiValori.Enabled = False
        TimerScriviValori.Enabled = False

        sendUsbDevice(0, 0, 0, 0)
        sendUsbDevice(0, 0, 0, 0)

        DisconnettiUsbDevice()

    End Sub

    Dim PacchettiFalliti As Integer = 0

    Private Sub sendUsbDevice(intI As Byte, intR As Byte, intG As Byte, intB As Byte)
        If MyUsbDevice IsNot Nothing Then
            Dim blnSend As Boolean = False
            Dim intCntS As Integer = 0

            blnSend = blnSend Or Not sendByteUsbDevice(intI)

            If blnSend Then
                intCntS += 1

            End If

            blnSend = blnSend Or Not sendByteUsbDevice(intR)

            If blnSend Then
                intCntS += 1

            End If

            blnSend = blnSend Or Not sendByteUsbDevice(intG)

            If blnSend Then
                intCntS += 1

            End If

            blnSend = blnSend Or Not sendByteUsbDevice(intB)

            If blnSend Then
                intCntS += 1

            End If

            If blnSend Then
                addListi($"{Now.ToString("yyyy-MM-dd HH:mm:ss.fff")} Error {intCntS.ToString}.{PacchettiFalliti.ToString} send : L {intI.ToString} - RGB {intR.ToString},{intG.ToString},{intB.ToString}")

                If intCntS >= 4 Then
                    PacchettiFalliti += 1

                    If PacchettiFalliti > 5 Then
                        PacchettiFalliti = 0
                        ConnettiUsbDevice()

                    End If

                End If

            Else
                PacchettiFalliti = 0

            End If

        Else
            PacchettiFalliti = 0
            ConnettiUsbDevice()

        End If

    End Sub

    Private Function sendByteUsbDevice(byteX As Byte) As Boolean
        If MyUsbDevice IsNot Nothing Then
            Dim intS As Integer = 5
            Threading.Thread.Sleep(intS)

            Dim numBytesTransferred As Integer = 0

            Try
                MyUsbDevice.ControlTransfer(New UsbSetupPacket(
                    UsbCtrlFlags.RequestType_Class Or UsbCtrlFlags.Recipient_Device Or UsbCtrlFlags.Direction_Out,
                    &H9, &H300, byteX, 0), Nothing, 0, numBytesTransferred)

            Catch ex As Exception
                Return False

            End Try

            Dim byteR() As Byte = {If(byteX = Byte.MaxValue, 0, byteX + 1)}
            Dim tmrStart As Date = Now.AddMilliseconds(intS * 4)

            Do
                My.Application.DoEvents()
                Threading.Thread.Sleep(intS)

                Try
                    MyUsbDevice.ControlTransfer(New UsbSetupPacket(
                        UsbCtrlFlags.RequestType_Class Or UsbCtrlFlags.Recipient_Device Or UsbCtrlFlags.Direction_In,
                        &H1, &H300, 0, 1), byteR, 1, numBytesTransferred)

                    If byteX = byteR(0) Then
                        Return True

                    End If

                    If tmrStart < Now Then
                        Return False

                    End If

                Catch ex As Exception
                    Return False

                End Try

            Loop

        End If

        Return False
    End Function

    <System.Runtime.InteropServices.DllImportAttribute("user32.dll")>
    Private Shared Function DestroyIcon(ByVal handle As IntPtr) As Boolean
    End Function

    Private Sub TimerScriviValori_Tick(sender As Object, e As EventArgs) Handles TimerScriviValori.Tick
        TimerScriviValori.Enabled = False

        Dim myBitmap As Bitmap = Me.Icon.ToBitmap
        Dim grpX As Graphics = Graphics.FromImage(myBitmap)
        '  grpX.Clear(Color.Black)

        For intX As Integer = 0 To lstDrivers.Count - 1
            Try
                lstDrivers(intX).show(TrackBarLuminosita.Value)

                If Not FlowLayoutPanelLeds.Controls.Contains(lstDrivers(intX).Control) Then
                    FlowLayoutPanelLeds.Controls.Add(lstDrivers(intX).Control)

                End If

                Dim clrX As Color = lstDrivers(intX).Control.BackColor
                sendUsbDevice(CByte(intX + 1), clrX.R, clrX.G, clrX.B)

                grpX.FillRectangle(New SolidBrush(clrX), CSng(intX * (myBitmap.Width / lstDrivers.Count)), 0, CSng(myBitmap.Width / lstDrivers.Count), myBitmap.Height)
                grpX.DrawLine(New Pen(Color.White, 1), CSng(intX * (myBitmap.Width / lstDrivers.Count)), 0, CSng(intX * (myBitmap.Width / lstDrivers.Count)), myBitmap.Height)

                lstDrivers(intX).reset()

            Catch ex As Exception
                '

            End Try

        Next

        grpX.DrawRectangle(New Pen(Color.White, 1), 0, 0, myBitmap.Width - 1, myBitmap.Height - 1)

        DestroyIcon(Me.Icon.Handle)

        Me.Icon = Icon.FromHandle(myBitmap.GetHicon())

        TimerScriviValori.Enabled = True
    End Sub

    Private Sub TrackBarLeggi_Scroll(sender As Object, e As EventArgs) Handles TrackBarLeggi.Scroll
        TimerLeggiValori.Interval = TrackBarLeggi.Value
        Me.ToolTipMain.SetToolTip(Me.TrackBarLeggi, $"{TrackBarLeggi.Value.ToString} su {TrackBarLeggi.Maximum.ToString} (Ogni {Math.Round(TrackBarLeggi.Value / 1000D, 2).ToString("0.00")} sec, {Math.Round(1000D / TrackBarLeggi.Value, 2).ToString("0.00")} volte al sec)")

    End Sub

    Private Sub TrackBarScrivi_Scroll(sender As Object, e As EventArgs) Handles TrackBarScrivi.Scroll
        TimerScriviValori.Interval = TrackBarScrivi.Value
        Me.ToolTipMain.SetToolTip(Me.TrackBarScrivi, $"{TrackBarScrivi.Value.ToString} su {TrackBarScrivi.Maximum.ToString} (Ogni {Math.Round(TrackBarScrivi.Value / 1000D, 2).ToString("0.00")} sec, {Math.Round(1000D / TrackBarScrivi.Value, 2).ToString("0.00")} volte al sec)")

    End Sub

    Private Sub TrackBarLuminosita_Scroll(sender As Object, e As EventArgs) Handles TrackBarLuminosita.Scroll
        Me.ToolTipMain.SetToolTip(Me.TrackBarLuminosita, $"{TrackBarLuminosita.Value} su 255 ({((TrackBarLuminosita.Value * 100) / 255).ToString("0.00")}%)")

    End Sub

    Dim lstLan As New List(Of String)

    Private Sub TimerDriver_Tick(sender As Object, e As EventArgs) Handles TimerDriver.Tick
        For Each drive As IO.DriveInfo In My.Computer.FileSystem.Drives
            If drive.DriveType = IO.DriveType.Fixed OrElse drive.DriveType = IO.DriveType.Removable Then
                Dim x As New clsDriver(drive.Name.Substring(0, 2), clsDriver.enmTipo.Drive) With {.Control = New urcLed() With {.BorderStyle = BorderStyle.FixedSingle, .Width = drcW, .Height = drcH}}

                If Not lstDrivers.Contains(x) Then
                    addListi("Found Driver " & drive.Name & " " & drive.DriveType.ToString & " " & If(drive.DriveType = IO.DriveType.Fixed OrElse drive.DriveType = IO.DriveType.Removable, String.Empty, "IGNORED"))

                    lstDrivers.Add(x)

                End If

            End If

        Next

        For Each adapter As Net.NetworkInformation.NetworkInterface In Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()
            Dim properties As Net.NetworkInformation.IPInterfaceProperties = adapter.GetIPProperties()
            If adapter.OperationalStatus = Net.NetworkInformation.OperationalStatus.Up AndAlso Not adapter.NetworkInterfaceType = Net.NetworkInformation.NetworkInterfaceType.Loopback Then
                Dim x As New clsDriver(adapter.Description.Replace("(", "[").Replace(")", "]"), clsDriver.enmTipo.Lan) With {.Control = New urcLed() With {.BorderStyle = BorderStyle.FixedSingle, .Width = drcW, .Height = drcH}}

                If Not lstDrivers.Contains(x) AndAlso Not lstLan.Contains(adapter.Description) Then
                    addListi("Found Network " & adapter.Description & " " & adapter.OperationalStatus.ToString)

                    lstDrivers.Add(x)

                End If

            End If

        Next

    End Sub
End Class