Device Not Showing in COM Port

Official Hardware Classic UNO R4 WiFi
1

I just got the Uno r4 WiFi, and connected it to my laptop. It detects in in the IDE as COM 7, but when I try to upload a simple blink program, it says no device is found on COM 7. I looked in the Device Manager, and it show up as a Human Interface Device. On the COM ports part of Device Manager, COM 7 only shows up as a USB Serial Device (COM 7). How can I get Windows to detect it as an Uno r4 WiFi on port 7?

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It's not necessary to specify in a specific port in device manager, as long as device manager detects your advice you should not need to change anything unless there are device conflicts.

Have you selected the correct board under board manager?

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Installing the core for megaAVR boards | Arduino Documentation

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The correct documentation link for the UNO R4 WiFi is https://docs.arduino.cc/hardware/uno-r4-wifi

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I followed the directions per the documentation, and get the same "No Device Found on COM 7". The Boards Manager detects the Uno R4 WiFi as a COM 7 Serial Port (USB) device. It also says "Failed uploading: uploading error: exit status 1". In the Devices and Printers Window it shows "UNO WIFI R4 CMSIS-DAP"

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What board have you selected from the board manager list and what code are you uploading?

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I am using the Arduino Uno R4 Boards v1.0.1 from the Boards Manager and selected the Arduino Uno R4 WiFi. I am trying to upload the simple blink program provided.

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I got the blink program to work with IDE version 1.8. Could having version 1.8 and 2.0+ installed at the same time be the issue? I don't seem to have any problem programming an ESP32 with both installed.

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9

I have the same problem using Arduino IDE 2.1.0.

No device found on COM9
Failed uploading: uploading error: exit status 1

No problem if I use Arduino IDE 1.8.19.

Don

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There are some "Chinese" boards offering themselves as V4.
Note that most of these will usually still require such as the CH340 drivers.

COMMON ISSUES

  • Ensure you have FULLY inserted the USB cables.
  • Check you have a COMMON GROUND where required. ( Thanks Perry)
  • Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.
  • Try other computers where possible.
  • Try other USB leads where possible.
  • You may not have the correct driver installed. CH340/341 or CP2102 or FT232 VCP Drivers - FTDI
  • There may be a problem with the board check or remove your wiring first.
  • Remove any items connected to pins 0 and 1.
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@Ballscrewbob
let's try not to confuse users, I'm sure we're talking about our newly launched UNO R4 WiFi with LED Matrix here.

It's a problem we've been finding among some Windows users

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Yes, I'm using the newly launched UNO R4 WiFi with LED Matrix.

In IDE 2.0, if I select Tools, Get Bord info, I get:

BN: Arduino R4 WiFi
VID: 0x2341
PID: 0x1002
SN: DC5475C4B658

Don

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@mopandglow @donblake
can you try this?

CleanShot 2023-06-28 at 18.20.59@2x
CleanShot 2023-06-28 at 18.20.59@2x1438×1255 214 KB

  • open the folder in my screenshot (of course yours won't be "ubidefeo" but your username)
  • delete the folders bossac and dfu-util
  • uninstall the board support from the board manager
  • reinstall the board support from the board manager

I ended up having this issue after an update, but I was running an internal core.
Then removed the folders, reinstalled and it worked after

Let me know
u.

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Search for Arduino R4 or V4 on the Chinese shopping sites.
Not adding any confusion just clarifying that clone sellers have also moved the goal posts to include V4 or R4.

Some are selling regular UNO's as V4 !
https://www.aliexpress.com/item/1005004333733836.html?spm=a2g0o.productlist.main.9.24d430182dfheb&algo_pvid=2354927e-6540-4871-96d4-abf5726ca471&aem_p4p_detail=202306280941177317244159932000001073854&algo_exp_id=2354927e-6540-4871-96d4-abf5726ca471-4&pdp_npi=3%40dis!CAD!9.42!9.42!!!!!%4021021f7b16879704774295915d076d!12000028795846847!sea!CA!1821957266&curPageLogUid=5PWmSakOGvI8&search_p4p_id=202306280941177317244159932000001073854_1

Freenova appears to be the main culprit but thee are others.

https://www.aliexpress.com/item/1005004954662164.html?spm=a2g0o.productlist.main.11.6b283ef0feBYUN&algo_pvid=cf8a18ba-f2f0-4c4c-a8e0-e7881d507c2b&algo_exp_id=cf8a18ba-f2f0-4c4c-a8e0-e7881d507c2b-5&pdp_npi=3%40dis!CAD!10.79!8.73!!!!!%40211bd7bf16879705717294636d0c55!12000031141615911!sea!CA!1821957266&curPageLogUid=SVWX3bSqiOHB

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I know, @Ballscrewbob

They have been around for a while, but this thread is not the case :slight_smile:
We just launched our Renesas UNO R4 and some issues are meant to come up

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I tried removing the bossac and dfu-util directories, uninstalling and reinstalling Arduino UNO R4 Boards.

It didn't make any difference.

Don

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@donblake

have you also unplugged the board and replugged it?
if you have USB-C unplug from the computer, not the board (yes, I had one of these weird things a few times)

can you check which versions of the tools you have by expanding the folders?
this is my configuration

CleanShot 2023-06-28 at 19.12.39@2x

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also remove open-ocd

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Have you tried uninstalling both Arduino IDE versions and only install one version?

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screen shot

I've tried unplugging the USB-C cable from the computer. In fact, I've tried two different USB cables with two different UNO R4 WiFi boards.

Tried deleting dfu-util, bossac and openocd. Then removed and re-added Arduino R4 Boards. No change.

One odd thing, after I get the No device found error message, the built-in LED is fading in and out. The loaded program is unchanged - if I hit the reset button, it runs.

OBTW: I'm running Windows 10.

Don

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