ESP32 Forum

Hi,

I was trying the blink example project with the Youtube video about the Espressif extensions using VS Code. I was able to build the project, selected the com port then flash with UART.

However, then second time I followed the exact same sequence, I got error saying "Failed to flash because of some unusual error". Here is the output:

> Executing task: C:\Users\.espressif\python_env\idf4.3_py3.8_env\Scripts\python.exe C:\Users\chenjo5\esp\esp-idf\components\esptool_py\esptool\esptool.py -p COM12 -b 460800 --before default_reset --after hard_reset --chip esp32 write_flash --flash_mode dio --flash_freq 40m --flash_size detect 0x10000 blink.bin 0x1000 bootloader/bootloader.bin 0x8000 partition_table/partition-table.bin <

esptool.py v3.1-dev
Serial port COM12
Traceback (most recent call last):
File "C:\Users\esp\esp-idf\components\esptool_py\esptool\esptool.py", line 4535, in <module>
_main()
File "C:\Users\esp\esp-idf\components\esptool_py\esptool\esptool.py", line 4528, in _main
main()
File "C:\Users\esp\esp-idf\components\esptool_py\esptool\esptool.py", line 4027, in main
esp = esp or get_default_connected_device(ser_list, port=args.port, connect_attempts=args.connect_attempts,
File "C:\Users\esp\esp-idf\components\esptool_py\esptool\esptool.py", line 120, in get_default_connected_device
_esp = chip_class(each_port, initial_baud, trace)
File "C:\Users\esp\esp-idf\components\esptool_py\esptool\esptool.py", line 310, in __init__
self._port = serial.serial_for_url(port)
File "C:\Users\.espressif\python_env\idf4.3_py3.8_env\lib\site-packages\serial\__init__.py", line 90, in serial_for_url
instance.open()
File "C:\Users\.espressif\python_env\idf4.3_py3.8_env\lib\site-packages\serial\serialwin32.py", line 64, in open
raise SerialException("could not open port {!r}: {!r}".format(self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port 'COM12': PermissionError(13, 'Access is denied.', None, 5)
The terminal process "C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -Command C:\Users\.espressif\python_env\idf4.3_py3.8_env\Scripts\python.exe C:\Users\chenjo5\esp\esp-idf\components\esptool_py\esptool\esptool.py -p COM12 -b 460800 --before default_reset --after hard_reset --chip esp32 write_flash --flash_mode dio --flash_freq 40m --flash_size detect 0x10000 blink.bin 0x1000 bootloader/bootloader.bin 0x8000 partition_table/partition-table.bin" terminated with exit code: 1.


Can you help me to solve this problem?

If I close VS Code, open again and repeated the same sequence, it was ok to flash. But the second time still failed.

Thanks!

Seems that the serial port is not accessible for the user, maybe another application is using it ?

Make sure ESP-IDF monitor is not running and you closed the terminal from previous flash task.

ESP_bignacio wrote: ↑

Mon Jul 05, 2021 6:33 am

Seems that the serial port is not accessible for the user, maybe another application is using it ?

Make sure ESP-IDF monitor is not running and you closed the terminal from previous flash task.

That solves the problem, thank you! Another question is when I tried to use JTAG to flash my ESP32-WROOM-32UE dev kit, it first asked "OpenOCD is not running, do you want to launch it?". I clicked on Yes, it shows the error below:

Open On-Chip Debugger v0.10.0-esp32-20210401 (2021-04-01-15:46)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
adapter speed: 20000 kHz

WARNING: boards/esp32-wrover.cfg is deprecated, and may be removed in a future release.
If your board is ESP32-WROVER-KIT, use board/esp32-wrover-kit-1.8v.cfg instead.
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Error: no device found
Error: unable to open ftdi device with vid 0403, pid 6010, description '*', serial '*' at bus location '*'
Error: no device found
Error: unable to open ftdi device with vid 0403, pid 6014, description '*', serial '*' at bus location '*'

Assertion failed!

Program: C:\Users\.espressif\tools\openocd-esp32\v0.10.0-esp32-20210401\openocd-esp32\bin\openocd.exe
File: ../src/jtag/core.c, Line 343

Expression: jtag_trst == 0
[Stopped] : OpenOCD Server


can you help?

Thanks!

You didn't say which JTAG interface you're using, but some need you to use Zadig tool to install a WinUSB driver. Here's an example:
https://docs.espressif.com/projects/esp ... -jtag.html
Maybe you need to do that ? HTH