rework the open_terminal(), set reset signal correctly

kflash.py

@@ -851,6 +851,16 @@ class MAIXLoader:
                 speed = str(int((n + 1) * 4096 / 1024.0 / time_delta)) + 'kiB/s'
             printProgressBar(n+1, total_chunk, prefix = 'Programming BIN:', suffix = speed, length = columns - 35)
 
+def open_terminal(reset):
+    control_signal = '0' if reset else '1'
+    control_signal_b = not reset
+    import serial.tools.miniterm
+    # For using the terminal with MaixPy the 'filter' option must be set to 'direct'
+    # because some control characters are emited
+    sys.argv = ['kflash.py', _port, '115200', '--dtr='+control_signal, '--rts='+control_signal,  '--filter=direct']
+    serial.tools.miniterm.main(default_port=_port, default_baudrate=115200, default_dtr=control_signal_b, default_rts=control_signal_b)
+    sys.exit(0)
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument("-p", "--port", help="COM Port", default="DEFAULT")
@@ -1025,18 +1035,7 @@ if __name__ == '__main__':
 
     if args.sram:
         if(args.terminal == True):
-            import serial.tools.miniterm
-            _miniterm = serial.tools.miniterm.Miniterm(loader._port)
-            _miniterm.set_rx_encoding('UTF-8')
-            _miniterm.set_tx_encoding('UTF-8')
-            _miniterm.start()
-            try:
-                _miniterm.join(True)
-            except KeyboardInterrupt:
-                pass
-            _miniterm.join()
-            _miniterm.close()
-            sys.exit(0)
+            open_terminal(False)
 
     print(INFO_MSG,"Wait For 0.1 second for ISP to Boot", BASH_TIPS['DEFAULT'])
 
@@ -1097,9 +1096,4 @@ if __name__ == '__main__':
     loader._port.close()
 
     if(args.terminal == True):
-        import serial.tools.miniterm
-        # For using the terminal with MaixPy the 'filter' option must be set to 'direct'
-        # because some control characters are emited
-        sys.argv = ['kflash.py', _port, '115200', '--dtr=0', '--rts=0',  '--filter=direct']
-        serial.tools.miniterm.main(default_port=_port, default_baudrate=115200, default_dtr=False, default_rts=False)
-        sys.exit(0)
+        open_terminal(True)