about "A fatal error occurred: Failed to connect to ESP32..."error message

[peter882363]

I want to make flash my code to esp32_devkitc_v4 board. But appear the following error.
"A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header"
What happened?

[ESP_Sprite]

Can't really tell, that is the most generic 'can't communicate with ESP' error you can get. Can you post a bit more; what toolchain/SDK are you using and what OS?

[peter882363]

I used win7+msys32 to work. I am a novice.
I try simple example with esp32-devkit board.
first connect usb cable and run "make menuconfig" to setup serial port(COM20).
Then run "make flash" to build and burn flash.But got fail. The message as attached file.
Sometime I click boot button when appear Connecting... message. Maybe can succeed.
Why?

[ESP_Sprite]

Could be that your computer setup has some odd timings wrd the handshake signals that reset the board into the bootloader... Can you try this: as soon as the prompt 'Connecting...' appears, hold the 'boot' button and press the 'reset' button once. You can release the boot button as soon as the flashing begins. That should work more consistently.

[peter882363]

I have used this method, but it is not convenient.And I tried 10 pieces of it all.
I suspect that there is a problem with esp32-devkitc-v4's programming circuit design.
Because the same method is used on other brand boards, it is normal.
Are there other ways or suggestions for improvement?

[Andreas_Mainz]

Hi, i am using a Development board with ch340 usb driver Chip instead of ch2102. All my Connection problems disappered. You should also update to the latest flashtool Version.

[peter882363]

So when the esp32-devkitc-v4 board burns, must it press the boot button. No way to automate?

[Andreas_Mainz]

If the flashing works correctly you do Not need to press any buttom