CDM324 Monitoring Tool does not connect

[henridbr]

Hi,

Using the bootloader I was able to change the baud rate to 57600.

At first I replaced the baud rate of 1000000 by 57600 in the scripts:

• stream_visualizer.py (lines 253-254)
• cdm324_device.py (lines 29-30).

I connected the expansion board to my computer by USB, it's on COM8 set at 57600 bauds.

Then : python "C:\Users\henri\...\cdm324_fft-main\scripts\_start.py"
and I got the CDM324 Monitoring Tool.

Unfortunately it did not connect. The port field changed alternatively from COM4 to COM8 with the background color in white, but nothing occurs.
When I disconnected the USB cable, the backcolor of the COM field became red with the warning "No COM ports detected!"

Pushing the Debug button, I got some information:

PS C:\Users\henri> python "C:\Users\henri...\cdm324_fft-main\scripts_start.py"
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.12_3.12.1008.0_x64__qbz5n2kfra8p0\Lib\tkinter_init_.py", line 1967, in call
return self.func(*args)
^^^^^^^^^^^^^^^^
File "C:\Users\henri...\cdm324_fft-main\scripts_start.py", line 226, in
self.update_fw_button = tk.Button(self, text="Start Debug Tool", font=tkfont.Font(family='Helvetica', size=9), width="18", command=lambda:[self.start_debug_tool()])
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\henri...\cdm324_fft-main\scripts_start.py", line 98, in start_debug_tool
stream_vis_start(self.com_port)
File "C:\Users\henri...\cdm324_fft-main\scripts\stream_visualizer.py", line 253, in stream_vis_start
platform_serial = serial.Serial(com_port, 57600)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\henri\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0\LocalCache\local-packages\Python312\site-packages\serial\serialwin32.py", line 33, in init
super(Serial, self).init(*args, **kwargs)
File "C:\Users\henri\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0\LocalCache\local-packages\Python312\site-packages\serial\serialutil.py", line 244, in init
self.open()
File "C:\Users\henri\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0\LocalCache\local-packages\Python312\site-packages\serial\serialwin32.py", line 64, in open
raise SerialException("could not open port {!r}: {!r}".format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port '': FileNotFoundError(2, 'Le chemin d’accès spécifié est introuvable.', None, 3)
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.12_3.12.1008.0_x64__qbz5n2kfra8p0\Lib\tkinter_init_.py", line 1967, in call
return self.func(*args)
^^^^^^^^^^^^^^^^
File "C:\Users\henri...\cdm324_fft-main\scripts_start.py", line 226, in
self.update_fw_button = tk.Button(self, text="Start Debug Tool", font=tkfont.Font(family='Helvetica', size=9), width="18", command=lambda:[self.start_debug_tool()])
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\henri...\cdm324_fft-main\scripts_start.py", line 98, in start_debug_tool
stream_vis_start(self.com_port)
File "C:\Users\henri...\cdm324_fft-main\scripts\stream_visualizer.py", line 253, in stream_vis_start
platform_serial = serial.Serial(com_port, 57600)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\henri\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0\LocalCache\local-packages\Python312\site-packages\serial\serialwin32.py", line 33, in init
super(Serial, self).init(*args, **kwargs)
File "C:\Users\henri\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0\LocalCache\local-packages\Python312\site-packages\serial\serialutil.py", line 244, in init
self.open()
File "C:\Users\henri\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0\LocalCache\local-packages\Python312\site-packages\serial\serialwin32.py", line 64, in open
raise SerialException("could not open port {!r}: {!r}".format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port '': FileNotFoundError(2, 'Le chemin d’accès spécifié est introuvable.', None, 3)

[Marcus-Peterson]

Could you share your code here so that we can help?

[henridbr]

This is the code I modified by replacing 1000000 by 57600 which the actual baud rate.

In stream_visualizer.py from line 248:

def stream_vis_start(com_port):
	global platform_serial_initialized
	global platform_serial
	
	platform_serial_initialized = False
	platform_serial = serial.Serial(com_port, 57600)
	platform_serial.set_buffer_size(rx_size = 57600, tx_size = 57600)
	platform_serial.rts = False
	
	# Start GUI
	popup = CDM324()
	popup.configure_traits()	

In cdm324_device.py from line 24:

	# Connect to device
	def connect(self, COM_port):
		self.com_port = COM_port	

		# Open COM port
		self.serial = serial.Serial(self.com_port, 57600)
		self.serial.set_buffer_size(rx_size = 57600, tx_size = 57600)
		
		# Disable RTS to release RESET

[limpkin]

the rx_size & tx_size value shouldn't be changed (they are buffer size values). Only the serial.Serial() value should be changed.
Can you confirm that a standard terminal program allows you to talk to the platform?

[henridbr]

I tried both buffer sizes, same result with the GUI and debug.
Connected by USB to the expansion board with the port set at 57600 bauds, I receive the boot message (reset button) and some speed values but not each time I send "k".
It works fine with the FTDI232.

[limpkin]

So I just re-tried on my end flashing the 57600 firmware (with the _start.py script), modifying line 29 of _start.py to change '1000000' with '57600' and managed to get the GUI (not debug tool) running.
Please note that the debug tool will NOT work with a 57600 firmware as the baud rate will simply limit what's possible to broadcast.