Communication with PC and pic by FTI-232 and VB6

[rollins]

I'm tryng to communicate in full duplex with a pc (vb6)  and a pic 16f628

When I put a button with send command to the pic , the pc send , the pic receive and after send.
But without button it doesn't work

someone has in the past the same problem ?

Best regards*

[locus]

You may need to put a delay routine for the PC

[Ahmad_k]

Put your code here to check it.

[rollins]

Thanks but the delay is not important, the problem I Think is when you use the commevent, you can't put a send statment in case of receive for exemple

t

Posted on: April 29, 2008, 09:51:20 09:51 - Automerged
Here vb code:

Private Sub Comm1_OnComm()
Select Case Comm1.CommEvent
    Case comEvReceive
    byterec = Comm1.Input
    If Asc(byterec) = 13 Then
        fin = Len(Text1.Text)
       
        temp = Val(Text1.Text)
        ' here the code for data treatment
       
       
        Text1.Text = ""
        '
        '   Here I want to put a send statment but nothing append !!
        '
        Comm1.Output = Format(adress, "00000") & Chr(0) & _
                Format(ordre, "000") & Chr(0)


    Else
        Text1.Text = Text1.Text + byterec
    End If

End Select
 
End Sub

[Ahmad_k]

I think this code wait for data receive (byte : 13) if it is received then the PC send the required string. So it will not work like you said.

In your first post you said that the PC send first and then PIC respond, so now the PIC is not respondind because the PC isn't sending anything. If you can also put you PIC code.

[locus]

The problem is that you try to send a message from within the receive event.
The receive event should finish first before a send command can be issued.
This is because the oncomm event handles both send and receive events

Try put a timer.

[Ahmad_k]

The problem is that you try to send a message from within the receive event.
The receive event should finish first before a send command can be issued.
This is because the oncomm event handles both send and receive events

Try put a timer.

This is what i talking about, but we must be sure from his code to be ok, and then use a timer on visual basic.

[sherm]

Go here and look at these two excellent examples of how to communicate between a PC and PIC using VB6 and PicBasic Pro. They're both good code for basing your own applications on.

Sending data from a PC ... http://www.rentron.com/sending_data.htm

Receiving data from a microcontroller ... http://www.rentron.com/receiving_data.htm

[rollins]

Thanks but I don't know why I 've been put down with restriction !

Would you please send link to me by email at [email protected]

best regards


Posted on: April 29, 2008, 05:20:44 17:20 - Automerged
to Ahmad_k

No at first I ask to the pic to answer and after, it's would be automatic.
You right for the commevent behaviour, so I can use a timer , but do you think that It could be possible to work without a
MSCOMM ?

 best regards

[Ahmad_k]

For my projects i use MSCOMM_OnComm() only for initializing and then i use Timer on VB, on each timer overflow, i check i check the InBufferCount size to see if the whole data has been received if yes i respond with some fonctions and procedure calls.

When you use TIMERS in your VB code the usage of the CPU will be lower. So keep going and we are here to help you.

[rollins]

Thank Ahmad , I will have a look on this method and I keep you in touch

Many thanks again


Posted on: April 30, 2008, 04:35:22 16:35 - Automerged
To sherm

Not able to get the link, would you please send it to me by mail at [email protected]

[UNIDIFF]

Hi

What is a Fti 232 do you means FT-232 from FTDI

br

[rollins]

Ho yes FT-232 from FTDI,