Arduino Port Is Recognised but wont upload

osasus · January 16, 2025, 6:35pm

My arduino wifi r4 was working just fine untill it eventually decided to switch ports randomly. Now its still automatically recognised by arduino IDE on the new port but when I try to upload or open serial monitor I get the error "No device found on COM9". The device is on the device manager as COM9 however I cannot upload. It does work when I run it in bootloader mode as it switches back to COM7 as it was before however I need it to work without bootloader since im trying to use Excel datastreamer where the port wont work anymore either. Before the ports switched I could connect it to Excel aswell.

osasus · January 16, 2025, 7:05pm

Seems like it was a library that was causing the problem, when I removed the line "#include <HID.h>" it worked however im not sure what im doing wrong with the library.

ptillisch · January 16, 2025, 11:54pm

Hi @osasus.

Great job of identifying the cause of the problem!

You aren't doing anything wrong. Unfortunately, due to the unique design of the UNO R4 WiFi board, a special upload procedure is required when the board is running a sketch program that uses its HID capabilities:

https://docs.arduino.cc/tutorials/uno-r4-wifi/usb-hid/#sketch-upload-interference

So just make sure to follow the instructions provided at the link above when you encounter this "No device found on ..." error while uploading.

The Arduino developers are tracking some ideas about how the need for a special upload procedure might be avoided here:

github.com/arduino/ArduinoCore-renesas

Upload to UNO R4 WiFi fails when "1200 bps touch" causes port change

opened 05:00AM - 28 Jul 23 UTC

per1234

type: imperfection topic: code

### Describe the problem The upload operation for the [**UNO R4 WiFi**](https:/…/docs.arduino.cc/hardware/uno-r4-wifi) follows this sequence: 1. Perform a ["1200 bps touch"](https://arduino.github.io/arduino-cli/dev/platform-specification/#1200-bps-bootloader-reset) to put the board into the mode where it can be flashed. 1. Invoke the `bossac` command that flashes the binary to the board. It is common for the address of the board port to change after the "1200 bps touch" step and so the Arduino development tools have a system for detecting the post-touch address and using that address when the upload command is generated from [the "pattern"](https://arduino.github.io/arduino-cli/dev/platform-specification/#tools) defined for the board in `platform.txt`. That system involves a post-touch wait to watch for the new port to appear before eventually timing out and resorting to the fallback behavior of using the original address to the upload pattern if no address change was detected. Since some boards will never produce a post-touch address change (meaning the post-touch wait step would only cause an unnecessary delay in the upload operation) it is possible to configure the board to skip the wait step by setting [the `upload.wait_for_upload_port` property](https://arduino.github.io/arduino-cli/dev/platform-specification/#1200-bps-bootloader-reset) to `false` in the board definition. The assumption was made that the address of the **UNO R4 WiFi** board's port will never experience a post-touch address change, so its `upload.wait_for_upload_port` property is set to `false`. However, the address can change under certain conditions and this causes the `bossac` command invocation to fail with a "`No device found on ...`" error because the original port address is used in the generated command instead of the post-touch address. ### To reproduce #### Arduino IDE 1. Create a sketch with the following code: ```cpp #include <HID.h> void setup() {} void loop() {} ``` 1. Select the appropriate board and port for the **UNO R4 WiFi** from the Arduino IDE menus. 1. Select **Sketch > Upload** from the Arduino IDE menus. 1. Wait for the upload to complete successfully. the upload should be successful as long as the board isn't already running a problematic sketch. 1. Select **Sketch > Upload** from the Arduino IDE menus. 🐛 The upload fails: ```text Performing 1200-bps touch reset on serial port COM12 No device found on COM12 "C:\Users\per\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.9.1-arduino5/bossac" -d --port=COM12 -U -e -w "C:\Users\per\AppData\Local\Temp\arduino\sketches\6CF073A8170159518E82E009B3D511D0/sketch_jul27a.ino.bin" -R Failed uploading: uploading error: exit status 1 ``` #### Arduino CLI ##### Setup ```text $ arduino-cli version arduino-cli.exe Version: git-snapshot Commit: f66becdf Date: 2023-07-23T20:34:26Z $ mkdir /tmp/HIDSketch $ printf "#include <HID.h>\nvoid setup() {}\nvoid loop() {}\n" > "/tmp/HIDSketch/HIDSketch.ino" $ arduino-cli compile --fqbn arduino:renesas_uno:unor4wifi /tmp/HIDSketch [...] Used library Version Path HID C:\Users\per\AppData\Local\Arduino15\packages\arduino\hardware\renesas_uno\1.0.2\libraries\HID Used platform Version Path arduino:renesas_uno 1.0.2 C:\Users\per\AppData\Local\Arduino15\packages\arduino\hardware\renesas_uno\1.0.2 $ arduino-cli board list Port Protocol Type Board Name FQBN Core COM42 serial Serial Port (USB) Arduino UNO R4 WiFi arduino:renesas_uno:unor4wifi arduino:renesas_uno $ arduino-cli upload --fqbn arduino:renesas_uno:unor4wifi --port COM42 --verbose /tmp/HIDSketch # Upload of the sketch is successful as long as the board is not already running a problematic sketch Performing 1200-bps touch reset on serial port COM42 "C:\Users\per\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.9.1-arduino5/bossac" -d --port=COM42 -U -e -w "C:\Users\per\AppData\Local\Temp\arduino\sketches\1F72A0DD582A60EAC64D21C07F93BFD9/HIDSketch.ino.bin" -R Set binary mode version()=Arduino Bootloader (SAM-BA extended) 2.0 [Arduino:IKXYZ] Connected at 921600 baud identifyChip()=nRF52840-QIAA write(addr=0,size=0x34) writeWord(addr=0x30,value=0x400) writeWord(addr=0x20,value=0) Erase flash chipErase(addr=0) Done in 0.001 seconds Write 34604 bytes to flash (9 pages) [ ] 0% (0/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0, size=0x1000) [=== ] 11% (1/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x1000, size=0x1000) [====== ] 22% (2/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x2000, size=0x1000) [========== ] 33% (3/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x3000, size=0x1000) [============= ] 44% (4/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x4000, size=0x1000) [================ ] 55% (5/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x5000, size=0x1000) [==================== ] 66% (6/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x6000, size=0x1000) [======================= ] 77% (7/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x7000, size=0x1000) [========================== ] 88% (8/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x8000, size=0x1000) [==============================] 100% (9/9 pages) Done in 2.238 seconds reset() ``` ##### Demo ```text $ arduino-cli board list # The HID sketch causes the port address to change Port Protocol Type Board Name FQBN Core COM12 serial Serial Port (USB) Arduino UNO R4 WiFi arduino:renesas_uno:unor4wifi arduino:renesas_uno $ arduino-cli upload --fqbn arduino:renesas_uno:unor4wifi --port COM12 --verbose /tmp/HIDSketch # Touch step fails and the bossac command runs with the wrong port Performing 1200-bps touch reset on serial port COM12 Cannot perform port reset: TOUCH: error during reset: opening port at 1200bps: Invalid serial port "C:\Users\per\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.9.1-arduino5/bossac" -d --port=COM12 -U -e -w "C:\Users\per\AppData\Local\Temp\arduino\sketches\1F72A0DD582A60EAC64D21C07F93BFD9/HIDSketch.ino.bin" -R No device found on COM12 Failed uploading: uploading error: exit status 1 $ arduino-cli board list # Even though the touch process failed, it did put the board into bootloader mode Port Protocol Type Board Name FQBN Core COM42 serial Serial Port (USB) Arduino UNO R4 WiFi arduino:renesas_uno:unor4wifi arduino:renesas_uno $ arduino-cli upload --fqbn arduino:renesas_uno:unor4wifi --port COM42 /tmp/HIDSketch # The next upload succeeds because the board is in bootloader mode Performing 1200-bps touch reset on serial port COM42 "C:\Users\per\AppData\Local\Arduino15\packages\arduino\tools\bossac\1.9.1-arduino5/bossac" -d --port=COM42 -U -e -w "C:\Users\per\AppData\Local\Temp\arduino\sketches\1F72A0DD582A60EAC64D21C07F93BFD9/HIDSketch.ino.bin" -R Set binary mode version()=Arduino Bootloader (SAM-BA extended) 2.0 [Arduino:IKXYZ] Connected at 921600 baud identifyChip()=nRF52840-QIAA write(addr=0,size=0x34) writeWord(addr=0x30,value=0x400) writeWord(addr=0x20,value=0) Erase flash chipErase(addr=0) Done in 0.001 seconds Write 34604 bytes to flash (9 pages) [ ] 0% (0/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0, size=0x1000) [=== ] 11% (1/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x1000, size=0x1000) [====== ] 22% (2/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x2000, size=0x1000) [========== ] 33% (3/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x3000, size=0x1000) [============= ] 44% (4/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x4000, size=0x1000) [================ ] 55% (5/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x5000, size=0x1000) [==================== ] 66% (6/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x6000, size=0x1000) [======================= ] 77% (7/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x7000, size=0x1000) [========================== ] 88% (8/9 pages)write(addr=0x34,size=0x1000) writeBuffer(scr_addr=0x34, dst_addr=0x8000, size=0x1000) [==============================] 100% (9/9 pages) Done in 2.238 seconds reset() ``` ### Expected behavior Correct port address is always used in the upload command. ### Project version e5ab69859d70dd7f4e6ed7769b027fc371cd613c ### Operating system - Windows - Linux - macOS ### Operating system version - Windows 11 - Ubuntu 22.04 - macOS Ventura ### Additional context For the sake of simplicity, I used The [the low level "**HID**" library](https://github.com/arduino/ArduinoCore-renesas/tree/main/libraries/HID) in the demonstration sketch, but that is not commonly used in real world sketches. However, it is common to use the "[**Keyboard**](https://www.arduino.cc/reference/en/language/functions/usb/keyboard/)" or "[**Mouse**](https://www.arduino.cc/reference/en/language/functions/usb/mouse/)" libraries, which have a dependency on the "**HID**" library and are documented as supported for use with the **UNO R4 WiFi**: https://docs.arduino.cc/tutorials/uno-r4-wifi/usb-hid The fault will also occur when using either of those libraries in a sketch: ```cpp #include <Keyboard.h> void setup() {} void loop() {} ``` --- Originally reported at https://forum.arduino.cc/t/failed-uploading-after-upload-usb-hid-example/1151778 #### Additional reports - https://forum.arduino.cc/t/uploaded-sketch-with-hid-h-difficult-to-upload-new-sketch/1168847 - https://forum.arduino.cc/t/cannot-perform-port-reset-touch-error-during-reset-opening-port-at-1200bps-invalid-serial-port-uno-r4/1213771 - https://forum.arduino.cc/t/arduino-port-is-recognised-but-wont-upload/1343469 <a name="workaround"></a> #### Workaround 1. Unplug the USB cable of the **UNO R4 WiFi** board from your computer. 1. Connect the **UNO R4 WiFi board** to your computer with the USB cable. 1. Press and release the button marked "**RESET**" on your **UNO R4 WiFi** board quickly twice. You should now see the "**L**" LED pulsing. 1. Select the port of the **UNO R4 WiFi** board from Arduino IDE's **Tools > Port** menu. ❗ The double reset you did in step (3) can cause the port number of the board to change, so don't assume you already have the correct port selected. 1. Upload the sketch to the board as usual.

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Arduino Port Is Recognised but wont upload

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