Variablenübergabe zwischen RS232 und Atmega32

[Chris266]

Möglicherweise habe ich etwas übersehen (wer schaut mal drüber?), aber so gefällt es besser:

int index=0;
char ch[19];

while (1)
{
  c = uart_getc();
  if ( c & UART_NO_DATA )
  {
    /* 
     * no data available from UART 
     */
  }
  else
  {
    /*
     * new data available from UART
     * check for Frame or Overrun error
     */
    if ( c & UART_FRAME_ERROR )
    {
      /* Framing Error detected, i.e no stop bit detected */
      uart_puts_P("UART Frame Error: ");
      ch[0]=0;
      index=0;
    }
    else
    if ( c & UART_OVERRUN_ERROR )
    {
      /* 
       * Overrun, a character already present in the UART UDR register was 
       * not read by the interrupt handler before the next character arrived,
       * one or more received characters have been dropped
       */
      uart_puts_P("UART Overrun Error: ");
      ch[0]=0;
      index=0;
    }
    else
    if ( c & UART_BUFFER_OVERFLOW )
    {
      /* 
       * We are not reading the receive buffer fast enough,
       * one or more received character have been dropped 
       */
      uart_puts_P("Buffer overflow error: ");
      ch[0]=0;
      index=0;
    }
    else
    {
      /* 
       * send received character back
       */ 
      uart_putc( (unsigned char)c );
           
      if((unsigned char)c!=13)
      {
        ch[index]=c;
        index++;   
      }            
      else
      {
        ch[index]=0;
        index = 0;
        if (strcmp (ch,"TEMP1")==0)
        {
          // Temperatur soll angefragt werden
          uart_puts("Temperatur1=..........\n");
        }
        else
        if (strcmp (ch,"TEMP2")==0)
        {
          // Temperatur soll angefragt werden
          uart_puts("Temperatur2=..........\n");
        }
        else
        if (strcmp (ch,"PH")==0)
        {
          // Temperatur soll angefragt werden
          uart_puts("PH=..........\n");
        }
        else
        if (strcmp (ch,"HUMIDITY")==0)
        {
          // Temperatur soll angefragt werden
          uart_puts("Humidityr=..........\n");
        }    
        ch[0]=0;
      }             
    }
  } 
}

PS: es fehlt immernoch die Abfrage, ob die Anzahl der Empfangenen Zeichen länger als 18 sind. Das 19. ist das "0" Byte.

[Natureengeneer]

Danke Danke habe den Fehler Korrigiert. Habs auch oben abgeändert. Die Abfrage ob der String länger ist bau ich dann später noch ein.

In VB2010 habe ich das Senden eines Befehls so angestellt:

Verbindungsbutton RS232:

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
        Try
            SerialPort1.PortName = TextBox12.Text
            SerialPort1.BaudRate = TextBox13.Text
            SerialPort1.DataBits = 8
            SerialPort1.StopBits = IO.Ports.StopBits.One
            SerialPort1.Parity = IO.Ports.Parity.None
            SerialPort1.Handshake = IO.Ports.Handshake.None
            SerialPort1.Open()
            Button2.Enabled = False
            Button1.Enabled = True
            Button3.Enabled = True
            Button4.Enabled = True
            Button5.Enabled = True
            Button6.Enabled = True
            Button7.Enabled = True
            ProgressBar1.Value = 100
            MsgBox("Connected")
        Catch ex As Exception
            ProgressBar1.Value = 0
            MsgBox("Connection Error 001")
        End Try
    End Sub 

SendeButton:

Private Sub Button7_Click(sender As System.Object, e As System.EventArgs) Handles Button7.Click
        Dim buffer(200) As Byte
        Dim offset As Integer
        Dim count As Integer
        Dim returnValue As Integer
        offset = 0
        count = 17
        SerialPort1.Write(vbCr)
        SerialPort1.Write("TEMP1")
        SerialPort1.Write(vbCr)
        System.Threading.Thread.Sleep(1000)
        Dim IncommingData = SerialPort1.ReadExisting   
        TextBox15.Text = IncommingData
 End Sub