#003 ESP get into bootloader automatic
I came across a serial pin problem in my record: #001 ESP32 UART0,1,2 with arduino IDE I used pin2, and in a way it could work, as long as it's TX and won't be pull high when boot. But it seems to be better to use other pins Select bootloader mode The ESP32 will enter the serial bootloader when GPIO0 is held low on reset. Otherwise it will run the program in flash. GPIO0 Input Mode Low/GND ROM serial bootloader for esptool.py High/VCC Normal execution mode GPIO0 has an internal pullup resistor, so if it is left unconnected then it will pull high. Many boards use a button marked "Flash" (or "BOOT" on some Espressif development boards) that pulls GPIO0 low when pressed. GPIO2 must also be either left unconnected/floating, or driven Low, in order to enter the serial bootloader. Other Pins As well as GPIO0 and GPIO2, the following pins influence the serial bootloader mode: GPIO Meaning 12 (MTDI) If driven High, flas...