Add support for COM port discovery via USB VID/PID Add support for Leonardo USB bootloader auto-reset

src/CMakeLists.txt

@@ -75,6 +75,7 @@ if(MSVC)
         "msvc/getopt.c"
         "msvc/gettimeofday.c"
         "msvc/usleep.cpp"
+        "msvc/usb_com_helper.cpp"
         )
     set(EXTRA_WINDOWS_INCLUDES ${EXTRA_WINDOWS_INCLUDES}
         "msvc"

src/msvc/usb_com_helper.cpp

@@ -0,0 +1,82 @@
+/*
+ * avrdude - A Downloader/Uploader for AVR device programmers
+ * Copyright (C) 2019 Marius Greuel
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+extern "C"
+{
+#include "avrdude.h"
+}
+
+#include "usb_com_helper.h"
+#include "usb_com_locator.h"
+
+class AvrdudeConsole : public UsbComLocator::IConsole
+{
+public:
+    void WriteLine(UsbComLocator::MessageLevel level, const std::string& message) override
+    {
+        switch (level)
+        {
+        case UsbComLocator::MessageLevel::Verbose:
+            avrdude_message(MSG_NOTICE, "%s: %s\n", progname, message.c_str());
+            break;
+        case UsbComLocator::MessageLevel::Debug:
+            avrdude_message(MSG_DEBUG, "%s: %s\n", progname, message.c_str());
+            break;
+        default:
+            avrdude_message(MSG_INFO, "%s: %s\n", progname, message.c_str());
+            break;
+        }
+    }
+};
+
+int win32_find_usb_com_port(const char* deviceId, char** port, bool wait_for_device, bool find_related_devices, bool auto_reset)
+{
+    try
+    {
+        UsbComLocator::Locator::Options options;
+        options.WaitForDevice = wait_for_device;
+        options.FindRelatedDevices = find_related_devices;
+        options.AutoReset = auto_reset;
+
+        AvrdudeConsole console;
+        UsbComLocator::Locator locator(&console);
+        std::string filename = locator.FindPortForDevice(deviceId, &options);
+        if (filename.empty())
+        {
+            *port = nullptr;
+            return -1;
+        }
+
+        filename = "\\\\.\\" + filename;
+
+        size_t bufferSize = filename.size() + 1;
+        *port = static_cast<char*>(malloc(bufferSize));
+        if (*port == nullptr)
+        {
+            return -1;
+        }
+
+        strncpy(*port, filename.c_str(), bufferSize);
+        return 0;
+    }
+    catch (const std::exception&)
+    {
+        *port = nullptr;
+        return -1;
+    }
+}

src/msvc/usb_com_helper.h

@@ -0,0 +1,35 @@
+/*
+ * avrdude - A Downloader/Uploader for AVR device programmers
+ * Copyright (C) 2019 Marius Greuel
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef USB_COM_HELPER_H
+#define USB_COM_HELPER_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int win32_find_usb_com_port(const char* deviceId, char** port, bool wait_for_device, bool find_related_devices, bool auto_reset);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // USB_COM_HELPER_H

src/ser_win32.c

@@ -36,6 +36,10 @@
 #include "avrdude.h"
 #include "libavrdude.h"
 
+#ifdef _MSC_VER
+#include "msvc/usb_com_helper.h"
+#endif
+
 long serial_recv_timeout = 5000; /* ms */
 
 #define W32SERBUFSIZE 1024
@@ -257,6 +261,13 @@ static int ser_open(char * port, union pinfo pinfo, union filedescriptor *fdp)
 		return net_open(port + strlen("net:"), fdp);
 	}
 
+#ifdef _MSC_VER
+	if (win32_find_usb_com_port(port, &newname, true, true, true) >= 0)
+	{
+		port = newname;
+	}
+#endif
+
 	if (strncasecmp(port, "com", strlen("com")) == 0) {
 
 	    // prepend "\\\\.\\" to name, required for port # >= 10