Gambas 3.12.2 unable to receive serial data on Raspberry Pi

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firstsolo
Posts: 8
Joined: Thursday 04th November 2021 5:44pm

Gambas 3.12.2 unable to receive serial data on Raspberry Pi

Post by firstsolo » Thursday 04th November 2021 6:25pm

Hi All,
I have written software, in Gambas3, to control my radio using the serial interface. It use to work fine.
Now I no longer receive data back from the radio, transmit still works, and the radio actions the command, but Gambas does not see the reply.

Set up is:
Raspberry Pi 3 (NO Bluetooth H/W) (for good measure I have also tried disabling bluetooth in config.txt!)
Gambas 3.12.2
Latest Raspian OS

I have named the serial port "ctrserial" and to receive data I use "ctrserial_read()".
The programme never gets the receive interrupt.
This situation is true for "ttyAMA0", "serial0" or "ttyUSB0" (using a USB to serial converter)

If I use gtkterm (on ttyAMA0, Serial0, or ttyUSB0) then the response from the radio is picked up by the RPi. Indicating to me that the H/W is functioning. (maybe gtkterm does not use the serial interrupt??)

This program use to work on an old version of Gambas (3.9?)
Has something changed? ( I should never have upgraded :lol: )
Any help or ideas, much appreciated.

firstsolo
Posts: 8
Joined: Thursday 04th November 2021 5:44pm

Re: Gambas 3.12.2 unable to receive serial data on Raspberry Pi

Post by firstsolo » Saturday 06th November 2021 6:35pm

OK so found my "error", but I have no Idea how I have "got away with this" for so long, luck I guess!

in the FMain.form I named the serial port "serialport1" (yes its a different name to my first post, tried to start fresh!)
in the FMain.class I initialised the serialport as:

Code: Select all

Public Sub Form_Open()
  rs232port1 = New SerialPort As "rs232port1"
  rs232port1.Begin()
  rs232port1.PortName = "/dev/ttyUSB0"
  rs232port1.Speed = "4800"
  rs232port1.Parity = SerialPort.None
  rs232port1.DataBits = SerialPort.Bits8
  rs232port1.StopBits = SerialPort.Bits2
  rs232port1.FlowControl = SerialPort.Software
  rs232port1.EndOfLine = gb.Windows

  Try
  rs232port1.Open()
  rs232port1.send()
  If Error Then
    TextBox1.text = "Unable to open Serial port.Error:= " & Error
  Else
    TextBox1.text = "Serial port: " & rs232port1.PortName & " opened"
  Endif
End
so far OK. BUT here is my mistake...
in FMain.form in order to set up the receive routine, I right clicked on the serial icon and selected "events" and the system automatically entered:
Public Sub SerialPort1_Read()  
....
....
End
Obviously the "system" knows what its doing, sad though, that I had named my serial port "rs232port1" when I initialised it.....so nothing happened when receive data arrived.
It was just chance I spotted this....
OH well, almost two weeks of my life spent on this "silly" issue. Radio now back to working happily!

If it helps someone else... it was worth the effort! (maybe!)

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