I cannot achieve compilation with the arduino R4 (I have the wifi version, but that shouldn't matter). Programs compile fine for R3.

I am running release mode.

Here is the debug output (full output on attachment):
Board Properties



name=Arduino Uno R4 WiFi
build.core=arduino
build.crossprefix=arm-none-eabi-
build.compiler_path={runtime.tools.arm-none-eabi-gcc-7-2017q4.path}/bin/
build.variant=UNOWIFIR4
build.mcu=cortex-m4
build.architecture=cortex-m4
build.fpu=-mfpu=fpv4-sp-d16
build.float-abi=-mfloat-abi=hard
build.board=UNOWIFIR4
build.defines=-DF_CPU=48000000 -DNO_USB -DBACKTRACE_SUPPORT -DARDUINO_UNOR4_WIFI
vid.0=0x2341
pid.0=0x1002
vid.1=0x2341
pid.1=0x006D


Building variant ...
abi-gcc\\7-2017q4/bin/arm-none-eabi-gcc" -c -w -Os -g3 -nostdlib -DF_CPU=48000000 -DNO_USB -DBACKTRACE_SUPPORT -DARDUINO_UNOR4_WIFI -MMD -std=gnu11 -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fmessage-length=0 -fno-builtin -DARDUINO=108010 -DARDUINO_UNOWIFIR4 -DARDUINO_ARCH_RENESAS_UNO -DARDUINO_ARCH_RENESAS -DARDUINO_FSP -D_XOPEN_SOURCE -mthumb "@c:\\Users\\Noe \\variants\\UNOWIFIR4/defines.txt" -DCFG_TUSB_MCU=OPT_MCU_RAXXX "-Ic:\\Users\\Noe /cores/arduino/tinyusb" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated-avr-comp" -I"c:\\Users\\Noe \\cores\\arduino" -I"c:\\Users\\Noe \\variants\\UNOWIFIR4" "-iprefixc:\\Users\\Noe " "@c:\\Users\\Noe \\variants\\UNOWIFIR4/includes.txt" -o "C:\\Users\\Noe a\\core\\..\\variant\\common_data.c.o" "c:\\Users\\Noe \\variants\\UNOWIFIR4\\tmp_gen_c_files\\common_data.c"
"c:\\Users\\Noe 2017q4/bin/arm-none-eabi-gcc" -c -w -Os -g3 -nostdlib -DF_CPU=48000000 -DNO_USB -DBACKTRACE_SUPPORT -DARDUINO_UNOR4_WIFI -MMD -std=gnu11 -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fmessage-length=0 -fno-builtin -DARDUINO=108010 -DARDUINO_UNOWIFIR4 -DARDUINO_ARCH_RENESAS_UNO -DARDUINO_ARCH_RENESAS -DARDUINO_FSP -D_XOPEN_SOURCE -mthumb "@c:\\Users\\Noe \\variants\\UNOWIFIR4/defines.txt" -DCFG_TUSB_MCU=OPT_MCU_RAXXX "-Ic:\\Users\\Noe /cores/arduino/tinyusb" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated-avr-comp" -I"c:\\Users\\Noe \\cores\\arduino" -I"c:\\Users\\Noe \\variants\\UNOWIFIR4" "-iprefixc:\\Users\\Noe " "@c:\\Users\\Noe \\variants\\UNOWIFIR4/includes.txt" -o "C:\\Users\\Noe a\\core\\..\\variant\\main.c.o" "c:\\Users\\Noe \\variants\\UNOWIFIR4\\tmp_gen_c_files\\main.c"
"c:\\Users\\Noe 2017q4/bin/arm-none-eabi-gcc" -c -w -Os -g3 -nostdlib -DF_CPU=48000000 -DNO_USB -DBACKTRACE_SUPPORT -DARDUINO_UNOR4_WIFI -MMD -std=gnu11 -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fmessage-length=0 -fsigned-char -ffunction-sections -fdata-sections -fmessage-length=0 -fno-builtin -DARDUINO=108010 -DARDUINO_UNOWIFIR4 -DARDUINO_ARCH_RENESAS_UNO -DARDUINO_ARCH_RENESAS -DARDUINO_FSP -D_XOPEN_SOURCE -mthumb "@c:\\Users\\Noe \\variants\\UNOWIFIR4/defines.txt" -DCFG_TUSB_MCU=OPT_MCU_RAXXX "-Ic:\\Users\\Noe /cores/arduino/tinyusb" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated-avr-comp" -I"c:\\Users\\Noe \\cores\\arduino" -I"c:\\Users\\Noe \\variants\\UNOWIFIR4" "-iprefixc:\\Users\\Noe " "@c:\\Users\\Noe \\variants\\UNOWIFIR4/includes.txt" -o "C:\\Users\\Noe a\\core\\..\\variant\\pin_data.c.o" "c:\\Users\\Noe \\variants\\UNOWIFIR4\\tmp_gen_c_files\\pin_data.c"
"c:\\Users\\Noe 2017q4/bin/arm-none-eabi-g++" -c -w -Os -g3 -fno-use-cxa-atexit -fno-rtti -fno-exceptions -MMD -nostdlib -DF_CPU=48000000 -DNO_USB -DBACKTRACE_SUPPORT -DARDUINO_UNOR4_WIFI -MMD -std=gnu++17 -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -fsigned-char -ffunction-sections -fdata-sections -fmessage-length=0 -fno-builtin -DARDUINO=108010 "-DPROJECT_NAME="C:\\Users\\Noe Gros\\AppData\\Local\\Temp\\VMBuilds\\test\\unor4wifi\\Release/test.ino"" -DARDUINO_UNOWIFIR4 -DARDUINO_ARCH_RENESAS_UNO -DARDUINO_ARCH_RENESAS -DARDUINO_FSP -D_XOPEN_SOURCE -mthumb "@c:\\Users\\Noe \\variants\\UNOWIFIR4/defines.txt" -DCFG_TUSB_MCU=OPT_MCU_RAXXX "-Ic:\\Users\\Noe /cores/arduino/tinyusb" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated" "-Ic:\\Users\\Noe \\cores\\arduino/api/deprecated-avr-comp" -I"c:\\Users\\Noe \\cores\\arduino" -I"c:\\Users\\Noe \\variants\\UNOWIFIR4" "-iprefixc:\\Users\\Noe " "@c:\\Users\\Noe \\variants\\UNOWIFIR4/includes.txt" "c:\\Users\\Noe \\variants\\UNOWIFIR4\\variant.cpp" -o "C:\\Users\\Noe a\\core\\..\\variant\\variant.cpp.o"
Error compiling variant
Build failed for project 'test'

TRIAL Version of Visual Micro (Expires On 11 August 2023)
(Existing customer? CTRL+click Or go to this link (https://www.visualmicro.com/page/Trial-Mode-VS2022.aspx)

Could you also attach the full output from the Arduino IDE with the File > Preferences > Show Verbose Output During: Compile enabled?

One workaround for now is to add a Local Board.txt to your project in Visual Micro (vMicro > Add Code > Add Local Board.txt), and paste in the line from the attached file, this should allow the project to build for now.

Thanks for the update, the upload commands appear identical to us in both the Arduino IDE and Visual Micro.

Can you enable the below settings and resubmit the logs when attempting the upload so we can investigate further?

• vMicro > Uploader > Verbose
• Arduino IDE > Preferences > Show Verbose Output During; Upload

Thanks for the detail.

The command being run in both IDE's looks the same, do you get the same issue after compiling, if you run the command in the attached file from the command line?

Thanks for the update.

Is the board definitely on COM13 and nothing else is connected to its' Serial port?

Do you get a different result when running the attached command (from the Arduino IDE?)

Thanks for the update.

I had missed the 1200bps reset element so it likely won't work at all via DOS as you have experienced.

Can you confirm when you are uploading in Visual Micro that there are no instances of the Arduino IDE running at the same time?

Thanks for the update and detail.

We have one of these boards on the way so we will continue to investigate when it arrives and update as soon as we can with a fix.

Thanks! I've added a topic notification so let me know what you find here, and have fun with the LED matrix 

Same problem here

Uploader started for board Arduino Uno R4 WiFi(unor4wifi)
Upload method will be: bootloader
Uploading via Bootloader 
o5\bossac -d --port=COM6 -U -e -w fe.ino.bin" -R
Set binary mode
No device found on COM6
Send auto-baud
Set binary mode
The uploader process failed

If you can please download the latest version from the top of the below board (23.0507.4) this will resolve both issues reported on this thread (compile and upload):
https://www.visualmicro.com/forums/YaBB.pl?board=VS_ARDUINO_EXT_RELEASES