No processes running / resource busy

1

I’m trying this with multiple boards. Seeduino XIAO ESP32C3 as well as D1 Mini ESP32. My Sketch won’t upload with PlatformIO. Using Mac OS Sonoma 14.2.1 When doing so I suddenly get. After it has been working for the last… weeks?

A fatal error occurred: Could not open /dev/tty.usbmodem1101, the port is busy or doesn't exist.
([Errno 16] could not open port /dev/tty.usbmodem1101: [Errno 16] Resource busy: '/dev/tty.usbmodem1101')

Uploading with the Arduino IDE works. I shut down the Arduino IDE, so it can’t be that there is a serial monitor blocking the port. I also rebooted my mac.
ls -l /System/Library/Extensions/SiLabsUSBDriver.kext and ls -l /Library/Extensions/SiLabsUSBDriver.kext

Gives no results.

The thing is, that this worked once. so apparently something got blocked. i just can’t say what. There is no python or platformio process running that would indicate that something is blocking.
Interestingly i just shut down vscode and upload worked. But not reproducable.

lsof /dev/tty.usbserial-0264D1KX

produces no output.

My platformio.ini is:

[env:d1]
platform = espressif32
board = wemos_d1_mini32
framework = arduino
lib_deps = 
	khoih-prog/ESP32TimerInterrupt@^2.3.0
	https://github.com/leandcesar/PeakDetection
upload_port = /dev/tty.usbserial-0264D1KX
monitor_port = /dev/tty.usbserial-0264D1KX
monitor_speed = 115200
2

I’m not using a Mac but I think it is required to grant permission to access USB devices.

I have noticed that there is a difference between the port used and the one specified in your platformio.ini

/dev/tty.usbmodem1101 vs. /dev/tty.usbserial-0264D1KX ?!

3

turns out my problem was that i caused a coredump during setup() which means that the board was stuck in a reboot loop and to add to that somehow the boot button on the xiao esp32c3 wouldn’t work properly… my bad.