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Simultaneous USB CDC and MSC #11245

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Simultaneous USB CDC and MSC#11245
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Status: Needs investigationWe need to do some research before taking next steps on this issue
@PaulaScharf

Description

@PaulaScharf
PaulaScharf
opened on Apr 14, 2025

Board

sensebox_mcu_esp32s2

Device Description

schematics in case thats relevant

Hardware Configuration

no

Version

latest stable Release (if not listed below)

IDE Name

Arduino IDE 2.3.6

Operating System

Ubuntu

Flash frequency

80Mhz

PSRAM enabled

yes

Upload speed

921600

Description

In version 2.0.17 of arduino-esp32 we used to be able to use both MSC and CDC. Since version 3.0.0 or newer we have issues with that.

If only either MSC or CDC are enabled they each work fine.

However, when both CDC and MSC are enabled:​

  • We are able to receive Serial output through the serial monitor​
  • When trying to copy bin-files on it the device appears as read-only

Do we need to change anything in our boards.txt definition perhaps? Or could it be an issue with our TinyUF2?

##############################################################
# senseBox MCU ESP32-S2

sensebox_mcu_esp32s2.name=senseBox MCU-S2 ESP32-S2
sensebox_mcu_esp32s2.vid.0=0x303A
sensebox_mcu_esp32s2.pid.0=0x81B8
sensebox_mcu_esp32s2.vid.1=0x303A
sensebox_mcu_esp32s2.pid.1=0x81B9
sensebox_mcu_esp32s2.vid.2=0x303A
sensebox_mcu_esp32s2.pid.2=0x81BA

sensebox_mcu_esp32s2.bootloader.tool=esptool_py
sensebox_mcu_esp32s2.bootloader.tool.default=esptool_py

sensebox_mcu_esp32s2.upload.tool=esptool_py
sensebox_mcu_esp32s2.upload.tool.default=esptool_py
sensebox_mcu_esp32s2.upload.tool.network=esp_ota

sensebox_mcu_esp32s2.upload.maximum_size=1310720
sensebox_mcu_esp32s2.upload.maximum_data_size=327680
sensebox_mcu_esp32s2.upload.flags=
sensebox_mcu_esp32s2.upload.extra_flags=
sensebox_mcu_esp32s2.upload.use_1200bps_touch=true
sensebox_mcu_esp32s2.upload.wait_for_upload_port=true

sensebox_mcu_esp32s2.serial.disableDTR=false
sensebox_mcu_esp32s2.serial.disableRTS=false

sensebox_mcu_esp32s2.build.tarch=xtensa
sensebox_mcu_esp32s2.build.bootloader_addr=0x1000
sensebox_mcu_esp32s2.build.target=esp32s2
sensebox_mcu_esp32s2.build.mcu=esp32s2
sensebox_mcu_esp32s2.build.core=esp32
sensebox_mcu_esp32s2.build.variant=sensebox_mcu_esp32s2
sensebox_mcu_esp32s2.build.board=SENSEBOX_MCU_ESP32S2

sensebox_mcu_esp32s2.build.cdc_on_boot=1
sensebox_mcu_esp32s2.build.msc_on_boot=1
sensebox_mcu_esp32s2.build.dfu_on_boot=0
sensebox_mcu_esp32s2.build.f_cpu=240000000L
sensebox_mcu_esp32s2.build.flash_size=4MB
sensebox_mcu_esp32s2.build.flash_freq=80m
sensebox_mcu_esp32s2.build.flash_mode=dio
sensebox_mcu_esp32s2.build.boot=qio
sensebox_mcu_esp32s2.build.partitions=default
sensebox_mcu_esp32s2.build.defines=

sensebox_mcu_esp32s2.menu.CDCOnBoot.cdc=Enabled
sensebox_mcu_esp32s2.menu.CDCOnBoot.cdc.build.cdc_on_boot=1
sensebox_mcu_esp32s2.menu.CDCOnBoot.default=Disabled
sensebox_mcu_esp32s2.menu.CDCOnBoot.default.build.cdc_on_boot=0

sensebox_mcu_esp32s2.menu.MSCOnBoot.msc=Enabled
sensebox_mcu_esp32s2.menu.MSCOnBoot.msc.build.msc_on_boot=1
sensebox_mcu_esp32s2.menu.MSCOnBoot.default=Disabled
sensebox_mcu_esp32s2.menu.MSCOnBoot.default.build.msc_on_boot=0

sensebox_mcu_esp32s2.menu.DFUOnBoot.default=Disabled
sensebox_mcu_esp32s2.menu.DFUOnBoot.default.build.dfu_on_boot=0
sensebox_mcu_esp32s2.menu.DFUOnBoot.dfu=Enabled
sensebox_mcu_esp32s2.menu.DFUOnBoot.dfu.build.dfu_on_boot=1

sensebox_mcu_esp32s2.menu.UploadMode.cdc=Internal USB
sensebox_mcu_esp32s2.menu.UploadMode.cdc.upload.use_1200bps_touch=true
sensebox_mcu_esp32s2.menu.UploadMode.cdc.upload.wait_for_upload_port=true
sensebox_mcu_esp32s2.menu.UploadMode.default=UART0
sensebox_mcu_esp32s2.menu.UploadMode.default.upload.use_1200bps_touch=false
sensebox_mcu_esp32s2.menu.UploadMode.default.upload.wait_for_upload_port=false

sensebox_mcu_esp32s2.menu.PSRAM.enabled=Enabled
sensebox_mcu_esp32s2.menu.PSRAM.enabled.build.defines=-DBOARD_HAS_PSRAM
sensebox_mcu_esp32s2.menu.PSRAM.disabled=Disabled
sensebox_mcu_esp32s2.menu.PSRAM.disabled.build.defines=

sensebox_mcu_esp32s2.menu.PartitionScheme.tinyuf2=TinyUF2 4MB (1.3MB APP/960KB FATFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.tinyuf2.build.custom_bootloader=bootloader-tinyuf2
sensebox_mcu_esp32s2.menu.PartitionScheme.tinyuf2.build.custom_partitions=partitions-4MB-tinyuf2
sensebox_mcu_esp32s2.menu.PartitionScheme.tinyuf2.upload.maximum_size=1441792
sensebox_mcu_esp32s2.menu.PartitionScheme.tinyuf2.upload.extra_flags=0x2d0000 "{runtime.platform.path}/variants/{build.variant}/tinyuf2.bin"
sensebox_mcu_esp32s2.menu.PartitionScheme.default=Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.default.build.partitions=default
sensebox_mcu_esp32s2.menu.PartitionScheme.defaultffat=Default 4MB with ffat (1.2MB APP/1.5MB FATFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.defaultffat.build.partitions=default_ffat
sensebox_mcu_esp32s2.menu.PartitionScheme.minimal=Minimal (1.3MB APP/700KB SPIFFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.minimal.build.partitions=minimal
sensebox_mcu_esp32s2.menu.PartitionScheme.no_ota=No OTA (2MB APP/2MB SPIFFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.no_ota.build.partitions=no_ota
sensebox_mcu_esp32s2.menu.PartitionScheme.no_ota.upload.maximum_size=2097152
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_3g=No OTA (1MB APP/3MB SPIFFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_3g.build.partitions=noota_3g
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_3g.upload.maximum_size=1048576
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_ffat=No OTA (2MB APP/2MB FATFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_ffat.build.partitions=noota_ffat
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_ffat.upload.maximum_size=2097152
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_3gffat=No OTA (1MB APP/3MB FATFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_3gffat.build.partitions=noota_3gffat
sensebox_mcu_esp32s2.menu.PartitionScheme.noota_3gffat.upload.maximum_size=1048576
sensebox_mcu_esp32s2.menu.PartitionScheme.huge_app=Huge APP (3MB No OTA/1MB SPIFFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.huge_app.build.partitions=huge_app
sensebox_mcu_esp32s2.menu.PartitionScheme.huge_app.upload.maximum_size=3145728
sensebox_mcu_esp32s2.menu.PartitionScheme.min_spiffs=Minimal SPIFFS (1.9MB APP with OTA/190KB SPIFFS)
sensebox_mcu_esp32s2.menu.PartitionScheme.min_spiffs.build.partitions=min_spiffs
sensebox_mcu_esp32s2.menu.PartitionScheme.min_spiffs.upload.maximum_size=1966080

sensebox_mcu_esp32s2.menu.CPUFreq.240=240MHz (WiFi)
sensebox_mcu_esp32s2.menu.CPUFreq.240.build.f_cpu=240000000L
sensebox_mcu_esp32s2.menu.CPUFreq.160=160MHz (WiFi)
sensebox_mcu_esp32s2.menu.CPUFreq.160.build.f_cpu=160000000L
sensebox_mcu_esp32s2.menu.CPUFreq.80=80MHz (WiFi)
sensebox_mcu_esp32s2.menu.CPUFreq.80.build.f_cpu=80000000L
sensebox_mcu_esp32s2.menu.CPUFreq.40=40MHz
sensebox_mcu_esp32s2.menu.CPUFreq.40.build.f_cpu=40000000L
sensebox_mcu_esp32s2.menu.CPUFreq.20=20MHz
sensebox_mcu_esp32s2.menu.CPUFreq.20.build.f_cpu=20000000L
sensebox_mcu_esp32s2.menu.CPUFreq.10=10MHz
sensebox_mcu_esp32s2.menu.CPUFreq.10.build.f_cpu=10000000L

sensebox_mcu_esp32s2.menu.FlashMode.qio=QIO
sensebox_mcu_esp32s2.menu.FlashMode.qio.build.flash_mode=dio
sensebox_mcu_esp32s2.menu.FlashMode.qio.build.boot=qio
sensebox_mcu_esp32s2.menu.FlashMode.dio=DIO
sensebox_mcu_esp32s2.menu.FlashMode.dio.build.flash_mode=dio
sensebox_mcu_esp32s2.menu.FlashMode.dio.build.boot=dio
sensebox_mcu_esp32s2.menu.FlashMode.qout=QOUT
sensebox_mcu_esp32s2.menu.FlashMode.qout.build.flash_mode=dout
sensebox_mcu_esp32s2.menu.FlashMode.qout.build.boot=qout
sensebox_mcu_esp32s2.menu.FlashMode.dout=DOUT
sensebox_mcu_esp32s2.menu.FlashMode.dout.build.flash_mode=dout
sensebox_mcu_esp32s2.menu.FlashMode.dout.build.boot=dout

sensebox_mcu_esp32s2.menu.FlashFreq.80=80MHz
sensebox_mcu_esp32s2.menu.FlashFreq.80.build.flash_freq=80m
sensebox_mcu_esp32s2.menu.FlashFreq.40=40MHz
sensebox_mcu_esp32s2.menu.FlashFreq.40.build.flash_freq=40m

sensebox_mcu_esp32s2.menu.FlashSize.4M=4MB (32Mb)
sensebox_mcu_esp32s2.menu.FlashSize.4M.build.flash_size=4MB

sensebox_mcu_esp32s2.menu.UploadSpeed.921600=921600
sensebox_mcu_esp32s2.menu.UploadSpeed.921600.upload.speed=921600
sensebox_mcu_esp32s2.menu.UploadSpeed.115200=115200
sensebox_mcu_esp32s2.menu.UploadSpeed.115200.upload.speed=115200
sensebox_mcu_esp32s2.menu.UploadSpeed.256000.windows=256000
sensebox_mcu_esp32s2.menu.UploadSpeed.256000.upload.speed=256000
sensebox_mcu_esp32s2.menu.UploadSpeed.230400.windows.upload.speed=256000
sensebox_mcu_esp32s2.menu.UploadSpeed.230400=230400
sensebox_mcu_esp32s2.menu.UploadSpeed.230400.upload.speed=230400
sensebox_mcu_esp32s2.menu.UploadSpeed.460800.linux=460800
sensebox_mcu_esp32s2.menu.UploadSpeed.460800.macosx=460800
sensebox_mcu_esp32s2.menu.UploadSpeed.460800.upload.speed=460800
sensebox_mcu_esp32s2.menu.UploadSpeed.512000.windows=512000
sensebox_mcu_esp32s2.menu.UploadSpeed.512000.upload.speed=512000

sensebox_mcu_esp32s2.menu.DebugLevel.none=None
sensebox_mcu_esp32s2.menu.DebugLevel.none.build.code_debug=0
sensebox_mcu_esp32s2.menu.DebugLevel.error=Error
sensebox_mcu_esp32s2.menu.DebugLevel.error.build.code_debug=1
sensebox_mcu_esp32s2.menu.DebugLevel.warn=Warn
sensebox_mcu_esp32s2.menu.DebugLevel.warn.build.code_debug=2
sensebox_mcu_esp32s2.menu.DebugLevel.info=Info
sensebox_mcu_esp32s2.menu.DebugLevel.info.build.code_debug=3
sensebox_mcu_esp32s2.menu.DebugLevel.debug=Debug
sensebox_mcu_esp32s2.menu.DebugLevel.debug.build.code_debug=4
sensebox_mcu_esp32s2.menu.DebugLevel.verbose=Verbose
sensebox_mcu_esp32s2.menu.DebugLevel.verbose.build.code_debug=5

sensebox_mcu_esp32s2.menu.EraseFlash.none=Disabled
sensebox_mcu_esp32s2.menu.EraseFlash.none.upload.erase_cmd=
sensebox_mcu_esp32s2.menu.EraseFlash.all=Enabled
sensebox_mcu_esp32s2.menu.EraseFlash.all.upload.erase_cmd=-e

Any insight appreciated. Thank you for this nice repo.

Sketch

void setup() {
  Serial.begin(115200);
}

void loop() {
  Serial.println("hello");
  delay(500);
}

Debug Message

> Error while copying to 'disk'. 
The destination is read-only

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

  • I confirm I have checked existing issues, online documentation and Troubleshooting guide.

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