Also, according to the experience before, the Windows assign the COM port according VID, PID and serial number. So with the same device plug in, it should always get same COM port assignment. But when two devices with same VID, PID and serial number might be treated as same device. When you plug in them in sequence, Windows can assign different COM port for them. However, after rebooting the Windows with the two USB devices attached, the COM port assignment should be decided by Windows for the two USB devices with same VID, PID and serial number.
I originally started developing with the LPC2368 beta unit on a Windows XP machine. All was working fine with the Windows serial port driver. When the new (current) driver was released, I started using that and it wored fine. I then added a Vista machine to my office. I then loaded the new drivers onto the Vista machine and all worked fine.
serial port assigned to or has a problem
Download: https://urllio.com/2vEtcU
I then tried to run the LPC1768 on my XP machine, and again found I had to re-load the Windows Serial Port Driver. When I did, Windows reported that there was a problem and could not start the serial port driver. I tried re-installing it several times, both from the website as well as from a local drive copy. Finally, I went back to my LPC2368 mbed. Re-installed drivers, and everything works fine. Going back to the LPC1768, it fails. It always says the driver could not start. I have uninstalled, re-installed, etc., but to no avail.
I then tried to run a program that writes out to the port. This program works on the Vista machine (with either the LPC1768 or the LPC2368, as well as on the XP machine (but only with the LPC2368). SO, while I don't get the Windows error, the serial coms doesn't work on the XP machine with the LPC1768.
I have a problem with Windows not recognizing one of my 3 mbed units as a serial device. It works okay otherwise (CAN functions, SPI functions, analog in functions, pwmout functions, lED's flash...). Tried all the changing of ports, swapping over of usb leads, rebooting of machine, running just one mbed, or two (my normal configuration as I'm working on CAN bus controlled lighttubes for an art installation) or three even, but one of them (always the same one) just is never recognized - is there anything more I can try (other than what's on this page) or do I have a faulty unit?
Reading the forum, i see I am not the only one to have problems with the serial port.Using w7, all went well, serial port was 'COM8', did load my sketch, connect to breadboard, worked well. On reconnecting next day, Serial port is 'grey'. Did everything I could, following all reccomendations and advices, to no effect. On 'Device Manager', Uno is there with COM8, but on IDE, Serial Port still 'grey'.How come so many users have the same problem?Is there a solution, or is the sytem so badly designed that there is no much hope...Any idea would be welcome. Thank you.com64
Yes, I understand that (actually a DB25 LPT port can be a communications port for not just printers, transfered a few 200MB+ HD back in the day). I am only interested in the common thread of Com3. Can we narrow down problems when the Uno is assigned Com3 (throw out the LPT3 for now, until it resurfaces)? Can we put a poll on this forum to get a distribution of assigned Uno communication ports and problems?
spcomputing:Can we narrow down problems when the Uno is assigned Com3 (throw out the LPT3 for now, until it resurfaces)? Can we put a poll on this forum to get a distribution of assigned Uno communication ports and problems?
Thank you for your help. Following your instructions,I finally managed to get a port working (COM8). Also if the break in communication happens again (I am sure it will!), I know where to look. The problem very likely comes from my computer (W7) as when the connection is established, the Uno works well. I could also change the port at will, using one of the free ports not in use.The whole thing has been a bit nightmarish, wasting a lot of time and sanity.
I am experiencing troubles with the serial port also, never had issues with 0023 (besides some delays with bt devices) but now the menu is constantly grayed out... I tried updating the 8u2 to the rev0003, but after some uploads I got the same issue. Very annoying, the only workaround I found is to change the com port number every time this happens.
I am having a similar problem with the serial port on my Arduino Uno, Rev 3, that is being discussed in this thread. When I try to run a program on the Arduino, I get the error the error message: "Serial port "COM3' not found. Did you select the right one from the Tools > Serial Port menu?"When I go to the Tools > Serial port menu, it is greyed out. In reading the other posts to this thread, I noticed that, at one point, someone asked another member: "Do you hear the beep sound when you plug in the Uno to the computer?" My answer to that is: No, I do not get this sound. When I look at the device manager, it shows the Uno as being an "unknown device." Does this mean I should download the proper driver for the Uno? Will this solve the problem?
This error can occur if two devices that are installed on your computer have been assigned the same I/O ports, the same interrupt, or the same Direct Memory Access channel (either by the BIOS, the operating system, or both). This error message can also appear if the BIOS did not allocate enough resources to the device.
This is an intermittent problem code assigned while an ACPI reset method is being executed. If the device never restarts due to a failure, it will be stuck in this state and the system should be rebooted.
COM port (Communication port) is the name for the port serial interface that can be found in a common computer(IBM compatible). Sometimes computers come with one or two physical COM ports (RS-232), while today's models don't have them ususally. However, the COM port does not necessarily refer to physical ports, but also virtual. Such ports are created when using USB-to-UART adapter, most notably used by FTDI and Croduino. Here are a few examples of such devices: USB modems, cell phones, RFID readers, card readers, and so on.
If the above steps did not work, and your computer has had unusually large number of COM ports assigned (more then 256), then it will not be possible to mount additional COM ports to your computer without cleaning up all unused ports. The process for cleaning up unused ports is as follows:
This will open the device manager. Next you will need to review all COM ports that are hidden from view, but assigned to other devices that are not in use. To do this from device manager, click View>Hidden Devices.
I have the same issue. I'm running Windows 10. Prusa i3 Mk3 on COM4. I cannot see that any other application is using the port. I unplugged and replugged the USB cable and rescanned the ports several times with no success. Just now, I unplugged and replugged the USB cable, clicked on the Rescan button and highlighted the serial port. Then I clicked on Flash and it worked. Lucky me!
Ultimately, I ended up using a spare computer which had just been reimaged. Therefore none of the ports had yet ever been "assigned" to any use. I ran the software and it installed and ran as it should. This would also indicate that going in and reassigning a port on your existing device that is having issues "should" work. It still seems a little quirky for the average user though I do recognize many younger folks (the under thirty crowd) should not have an issue with this. I am 60+ but have an IT background so I understood what could be done but would like to see a more "precise and controlled" process for less hassles. All good now!!
I can tell that I had same problem with updating firmware.I used USB ports in front of the PC.They definitely work correctly. I am using them to programming arduino. Not on port 3, but higher.
This was part of the solution for me. Those exact directions under "option 2" didn't quite work, but deleting everything assigned to the Com Port, and then re-assigning to a different port, did help, although not initially.
Devices having serial numbers are recognized by Windows no matter which USB portyou plug them into.I would guess that one of the devices was plugged-in previously on COM4, where theother is now plugged-in, so Windows just remembered it from before.
In the case of a 9103 / Arduino conflict, remove all other devices, then plug in the 9103 and power it on. Next run the Actuel software. The software will find and take control of the 9103 port, and once assigned, you can safely plug in the next device and run its client.
The COM port numbers always seem to be taken up by something and although right now I only have 4 serial ports (3 over Bluetooth and one USB to RS-232), I have numerous COM ports set as in use. I'd like to clean that list up a bit.
If you do all that before loading the correct driver package and try to keep the Com device inserted in the same port rather than moving it around your ports you will have fewer problems with the Prolific driver.
Step 6. If the program does not recognize the programming cable or the COM Port assigned to it, refer to the manufacturer of the programming software. If you are using CHIRP programming software, go to the CHIRP web site at and download the latest daily build of CHIRP or report the issue to CHIRP.
This is not an answer, that is what tutorial says but i am saying there is no serial port with my implementation. Question is what can cause this. FreeRTOS version? Libero version? I m using libero 11.9 and freertos 9
The serial ports are created by the FTDI chip on the board. If that chip is working properly, it will enumerate with 4 COM ports on the host computer regardless of how the SmartFusion is programmed. This implies that either there is a communication problem (probably with the host drivers) or a problem with the IC itself.
Just to clarify, there are no other devices present in Device Manager when you are able to see the one FlashPro port? Not necessarily COM ports, but unknown devices, anything that the other ports may have been incorrectly assigned to? 2ff7e9595c
Comentários