adding CH9328 CPython demo

CH9328_CPython_Demo/code.py

@@ -0,0 +1,75 @@
+# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import sys
+import serial
+import keyboard
+
+port = '/dev/ttyUSB0'  # Replace with your actual serial port
+
+# Define a mapping for special characters when shift is pressed
+SHIFTED_KEYS = {
+    '1': '!', '2': '@', '3': '#', '4': '$', '5': '%',
+    '6': '^', '7': '&', '8': '*', '9': '(', '0': ')',
+    '`': '~', '-': '_', '=': '+', '[': '{', ']': '}',
+    '\\': '|', ';': ':', "'": '"', ',': '<', '.': '>',
+    '/': '?'
+}
+
+def send_key(serial_port, key):
+    """
+    Send a key press to the CH9328 via UART.
+
+    Parameters:
+    serial_port (serial.Serial): The serial port connection.
+    key (str): The key to send.
+    """
+    serial_port.write(key.encode('ascii'))
+    serial_port.flush()
+
+def send_empty_report(serial_port):
+    """
+    Send an empty HID report to reset the state of the device.
+
+    Parameters:
+    serial_port (serial.Serial): The serial port connection.
+    """
+    try:
+        empty_report = bytearray([0] * 8)
+        serial_port.write(empty_report)
+        serial_port.flush()
+    except serial.SerialException as e:
+        print(f"Failed to send empty report: {e}")
+
+def main():
+    # Configure the serial connection
+    baudrate = 9600  # Default baud rate for CH9328 in Mode 1
+    timeout = 1
+
+    with serial.Serial(port, baudrate, timeout=timeout) as ser:
+
+        print("Listening for keyboard inputs. Press 'ESC' to exit.")
+
+        def on_key_event(event):
+            if event.event_type == 'down':
+                key = event.name
+                if len(key) == 1:  # Only process single character keys
+                    if keyboard.is_pressed('shift'):  # Check if shift is pressed
+                        key = SHIFTED_KEYS.get(key, key.upper())
+                    send_key(ser, key)
+                elif key == 'space':
+                    send_key(ser, ' ')
+                elif key == 'enter':
+                    send_key(ser, '\n')
+            send_empty_report(ser)
+
+        # Hook the keyboard event
+        keyboard.hook(on_key_event)
+
+        # Wait for ESC to exit
+        keyboard.wait('esc')
+
+if __name__ == "__main__":
+    main()
+    sys.exit()