Trying to get Error when FT232H Adafruit Breakout is not plugged in

Question

Sarah Crimi 2018-8-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/415308-trying-to-get-error-when-ft232h-adafruit-breakout-is-not-plugged-in

回答： Sarah Crimi 2018-8-28

Hello, I am having an issue getting an error to show using MATLAB to connect to FT232H Adafruit Breakout via Python. I wanted to throw an error when the FT232H is not plugged in using a message box in Matlab. However, this was the only example code that I could find online. Is this the proper way of doing this? It seems like it's not catching the error properly when it is not plugged in.

try py.list(['x','y',1]) catch e e.message

 %While there is a Python exception, adafruit_flag = 0.
 while(isa(e,'matlab.exception.PyException'))
 handles.adafruit_flag = 0;
 e.ExceptionObject
 button = questdlg('Error. Adafruit is not connected. If you want to reconnect, reconnect and press yes. Else press no to exit and close down Bode','Yes', 'No');
 switch button
 case 'Yes'
 break;
 case 'No'
 %shutoff device
 end
 end

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Answer 1

Sarah Crimi 2018-8-28

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/415308-trying-to-get-error-when-ft232h-adafruit-breakout-is-not-plugged-in#answer_334433

在 MATLAB Online 中打开

I figured this out. You have to create a function in Python that flags the user if the Adafruit product ID is equal to what it is on your computer.

#!/usr/bin/python
import sys
import usb.core
def checkadafruit():
      # find USB devices
      dev = usb.core.find(find_all=True)
      # loop through devices, printing vendor and product ids in decimal and hex
      flag = 0
      for cfg in dev:
          #if int(cfg.idProduct) == 24596:
            #  print('yes')
          a = int(cfg.idVendor)
          b = int(cfg.idProduct)
          c = 1027;
          d=24596;
          if b == d:
              flag = flag + 1
          else:
              flag = flag + 0
      return flag