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Jan 05, 2014 3) Click on “Communication” from the menubar, and choose “Configure Drivers” 4) From the “Available Driver Types” pull down menu, choose RS232, DF1 Devices, then hit “Add New”. 5) For this example, the name can be left at default. 6) Be sure to choose your COM port that you found in Step 1. On Windows 10, a device driver is an essential piece of code, which allows the system to interact with a specific hardware (such as graphics card, storage driver, network adapter, Bluetooth, etc.

The Ethernet switch device driver model (switchdev) is an in-kernel drivermodel for switch devices which offload the forwarding (data) plane from thekernel.

Figure 1 is a block diagram showing the components of the switchdev model foran example setup using a>FIB_EVENT_ENTRY_ADDused for both adding a new FIB entry to the device,or modifying an existing entry on the device.FIB_EVENT_ENTRY_DELused for removing a FIB entryFIB_EVENT_RULE_ADD,FIB_EVENT_RULE_DELused to propagate FIB rule changes

FIB_EVENT_ENTRY_ADD and FIB_EVENT_ENTRY_DEL events pass:

to add/modify/delete IPv4 dst/dest_len prefix on table tb_id. The *fistructure holds details on the route and route’s nexthops. *dev is oneof the port netdevs mentioned in the route’s next hop list.

Routes offloaded to the device are labeled with “offload” in the ip routelisting:

The “offload” flag is set in case at least one device offloads the FIB entry.

XXX: add/mod/del IPv6 FIB API

Nexthop Resolution¶

The FIB entry’s nexthop list contains the nexthop tuple (gateway, dev), but forthe switch device to forward the packet with the correct dst mac address, thenexthop gateways must be resolved to the neighbor’s mac address. Neighbor macaddress discovery comes via the ARP (or ND) process and is available via thearp_tbl neighbor table. To resolve the routes nexthop gateways, the drivershould trigger the kernel’s neighbor resolution process. See the rockerdriver’s rocker_port_ipv4_resolve() for an example.

The driver can monitor for updates to arp_tbl using the netevent notifierNETEVENT_NEIGH_UPDATE. The device can be programmed with resolved nexthopsfor the routes as arp_tbl updates. The driver implements ndo_neigh_destroyto know when arp_tbl neighbor entries are purged from the port.

In my one project, I need to create an application to upgrade the firmware of the device. Here comport is using for the communication. We cannot fix the COM ID of the USB device in the application because the device could be enumerated with different com id on a different machine as per the availability.

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So the solution is that displays the list of all known com ports and users select the correct com port. But it is not a good idea to show all com port, I want that application to identify the com id itself.

Every USB device has a unique hardware id (the combination of VID and PID), so to accomplish the above task my approach is to get COM PORT of USB Serial Device on the basis of VID/PID. The registry of the windows kept the information of the device, so simple logic here to open the windows registry and get the com id.

You can See this Article, Read & Write Windows Registry

How to find the VID and PID numbers

To find the vid (Vendor ID) and PID (Product ID) of a serial USB device first you need to attach the device with your PC. Now you need to follow the below steps to get the vid and PID.

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1. Go to Control Panel > Device Manager > Ports.

2. Select the desire com port and double click on it or right-click and select Properties.

3. Go to the Details tab and select Hardware ID to view its PID and VID.

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See the below code to get COM PORT of USB Serial Device (Arduino ) in the Windows machine.

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Reference: MSDN

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