[stm32] add usb_tunnel, cleanup setup makefile

also replace usb_tunnel_0 and usb_tunnel_1 on lpc with one usb_tunnel target with configurable uart

sw/airborne/arch/lpc21/usb_tunnel.c

@@ -46,6 +46,8 @@
 #endif
 #endif
 
+INFO_VAR(USB_TUNNEL_UART)
+
 int main( void ) {
   unsigned char inc;
   unsigned int rx_time=0, tx_time=0;

sw/airborne/arch/stm32/usb_ser_hw.c

@@ -483,8 +483,8 @@ void VCOM_transmit_message()
  * USE_USB_LINE_CODING is not used in case of example1, example2 and telemetry
  */
 #ifdef USE_USB_LINE_CODING
-void VCOM_allow_linecoding(uint8_t mode) {}
-void VCOM_set_linecoding(uint8_t mode) {}
+void VCOM_allow_linecoding(uint8_t mode __attribute__((unused))) {}
+void VCOM_set_linecoding(uint8_t mode __attribute__((unused))) {}
 #endif
 
 /*

sw/airborne/arch/stm32/usb_tunnel.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2009  Martin Mueller
+ *               2014  Felix Ruess <felix.ruess@gmail.com
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * paparazzi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+/**
+ * @file usb_tunnel.c
+ *
+ * USB tunnel application.
+ *
+ * This creates a USB serial port that connects to one of the UARTs.
+ * This enables you to e.g. configure the gps receiver or the modem without removing it.
+ */
+
+#include "std.h"
+#include "mcu.h"
+#include "mcu_periph/sys_time.h"
+#include "led.h"
+#include "mcu_periph/uart.h"
+#include "mcu_periph/usb_serial.h"
+
+#ifndef USB_TUNNEL_UART
+#error USB_TUNNEL_UART not defined. Add <configure name="TUNNEL_PORT" value="UARTx"/>
+#endif
+
+INFO_VAR(USB_TUNNEL_UART)
+
+
+static void tunnel_event(void)
+{
+  static unsigned char inc;
+
+  if (uart_char_available(&USB_TUNNEL_UART) && VCOM_check_free_space(1)) {
+    inc = uart_getch(&USB_TUNNEL_UART);
+    VCOM_putchar(inc);
+  }
+  if (VCOM_check_available() && uart_check_free_space(&USB_TUNNEL_UART, 1)) {
+    inc = VCOM_getchar();
+    uart_transmit(&USB_TUNNEL_UART, inc);
+  }
+}
+
+int main(void)
+{
+  mcu_init();
+  sys_time_init();
+  led_init();
+
+  VCOM_allow_linecoding(1);
+
+  VCOM_init();
+
+  mcu_int_enable();
+
+  while(1) {
+    VCOM_event();
+    tunnel_event();
+  }
+
+  return 0;
+}