lolin d32 pro needs pin0 pulled down to flash
Posted: Sat Feb 05, 2022 11:08 pm
I'm using two identical lolin boards as in the title to develop basic controller (thermo sensor, ssr, dimmer periphery) and every now & then they start requiring pin0 to be pulled down in order to flash. The tty works without problem.
when this happens typically the board is connected to a raspberry-pi clone (cubieboard) running armbian. same board connected to my laptop flashes without problem. Using extremely short usb cable (10cm) sometimes help, but not always. the usb host provides 5.1v, verified with tool.
looks like sort of mystical electrical problem which I don't even know where to start debugging. I plug my esp32 board into prototype board I've done. Even when the board is stripped of all peripherials the problem persists. It appears like the USB modem can't reset the board. If needed I can provide dump from esptool communication.
when this happens typically the board is connected to a raspberry-pi clone (cubieboard) running armbian. same board connected to my laptop flashes without problem. Using extremely short usb cable (10cm) sometimes help, but not always. the usb host provides 5.1v, verified with tool.
looks like sort of mystical electrical problem which I don't even know where to start debugging. I plug my esp32 board into prototype board I've done. Even when the board is stripped of all peripherials the problem persists. It appears like the USB modem can't reset the board. If needed I can provide dump from esptool communication.