support for mulitple device numbers

README.md

@@ -24,6 +24,8 @@ pyinstaller ./hdzero_programmer.py --onefile
 #### Install the ch341 kernel driver
 
 ```
+# might need to install gcc-12
+# sudo apt install gcc-12
 unzip ch341par_linux_V1.4_20230524.zip
 cd ch341par_linux/driver
 make
@@ -35,15 +37,17 @@ cd -
 - Note: something similar could potentially be perform with udev rules as well.
 - Plugin the hdzero-programmer dongle first (ID 1a86:5512 QinHeng Electronics CH341 in EPP/MEM/I2C mode, EPP/I2C adapter), then
 ```
-sudo chmod 777 /dev/ch34x_pis0
+# sometimes the device shows up as 0, 1, or some othter number. Chmod all of them.
+sudo chmod 777 /dev/ch34x_pis*
 ```
 
-
 #### Install python pre-requisites
 ```
 sudo apt-get install python3 python3-tk python3-pil.imagetk python3-wget
 ```
 
+#### Connect programmer to hdzero vtx
+
 #### Linux execute
 ```
 python3 ./hdzero_programmer.py

ch341.py

@@ -1,4 +1,5 @@
 import ctypes
+import glob
 import zlib
 import time
 import sys
@@ -87,8 +88,9 @@ def load(self):
             print("Please check ch341 driver")
 
     def open_device(self):
-        self.dll.CH34xCloseDevice(self.iIndex)
-        self.iIndex = self.dll.CH34xOpenDevice("/dev/ch34x_pis0".encode())
+        # Return first entry. The device number could be different on various systems.
+        device = glob.glob('/dev/ch34x_pis[0-9]*')[0]
+        self.iIndex = self.dll.CH34xOpenDevice(device.encode())
         return self.iIndex
 
     def close_device(self):