ESP8266 Community Forum

- Sun Oct 10, 2021 12:36 am #92571 I'm developing some Arduino code on a NodeMCU, and I have an ILI9341 hooked up to it along with some buttons.
The problem is, since flashing the code, I have been unable to flash since.

I believe this is because I've initialized the ILI9341 library using pin D3 as RST.
Whenever I plug it in, it connects for less than a second, then disconnects from my computer.
The display code (using Adafruit GFX) works as expected.

I have tried flashing blank scripts as soon as I plug it in, but there is not enough time.
I have also tried doing the same, while holding the RESET/FLASH button on the MCU.
I have not tried removing the screen yet, as I don't want to disassemble the project unless absolutely necessary.

I need to complete this project for an assignment, and I won't be able to order another MCU, but I do have at least a month to fix this.
Please advise on how I can recover this, so I can resume work on my project.
Thanks

- Mon Oct 11, 2021 2:35 am #92583 D3 is io 0. it is a boot configuration pin. it must read HIGH for normal boot and LOW for flashing mode. a connected device can interfere with this

- Mon Oct 11, 2021 3:49 am #92585

D3 is io 0. it is a boot configuration pin. it must read HIGH for normal boot and LOW for flashing mode. a connected device can interfere with this

So you're saying, if I disconnect all wires, there's a possibility this could recover it?
I'll give it a try tomorrow, thanks.

- Tue Oct 12, 2021 10:18 pm #92598 Yes, it worked!
Is there a list of pins that should not be used in order to properly flash? I do not want a repeat of this.
These two links suggest GPIO2 and GPIO15 (D4 and D8) also play a role in bootup, will these interfere in a similar way?
https://arduino.stackexchange.com/quest ... gpio0-pins
https://bbs.espressif.com/viewtopic.php?t=774
Thanks.