- My goal is to verify that it will be possible to burn firmware to ESP32 DevKitC from the IO pins instead of from the USB port, using linux on the host machine (eventually our design will have just the ESP32-WROOM on it instead of the entire DevKitC).
- My actions are: I have connected an FTDI friend to the Gnd, 3.3v, TXD and RXD pins on the ESP32.
- The result I see is: I can communicate with the ESP32 fine (for example, both ‘mos console’ and miniterm can communicate with a program previously loaded into the ESP32. I can put the ESP32 into bootloader mode by grounding IO0 and cycling EN, the chip responds with:
ets Jun 8 2016 00:22:57 rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2)) waiting for download
- My expectation & question is: I would expect to be able to put the ESP32 into bootloader mode, then be able to do a ‘mos flash’ and have it complete. Instead, ‘mos flash’ just keeps trying to connect:
Loaded sti-gateway/esp32 version 1.1.0 (20190515-201437/1.1.0-gfe70279-master) Using port /dev/ttyUSB0 Opening /dev/ttyUSB0 @ 115200... Connecting to ESP32 ROM, attempt 1 of 10... Connecting to ESP32 ROM, attempt 2 of 10... Connecting to ESP32 ROM, attempt 3 of 10... Connecting to ESP32 ROM, attempt 4 of 10... Connecting to ESP32 ROM, attempt 5 of 10... Connecting to ESP32 ROM, attempt 6 of 10... Connecting to ESP32 ROM, attempt 7 of 10... Connecting to ESP32 ROM, attempt 8 of 10... Connecting to ESP32 ROM, attempt 9 of 10... Connecting to ESP32 ROM, attempt 10 of 10... Error: /build/mos-i_6ltm/mos-2.13.1+2034cc0~bionic0/obj-x86_64-linux-gnu/src/cesanta.com/mos/flash/esp/rom_client/rom_client.go:156: failed to connect to ESP32 ROM /build/mos-i_6ltm/mos-2.13.1+2034cc0~bionic0/obj-x86_64-linux-gnu/src/cesanta.com/mos/flash/esp/rom_client/rom_client.go:108: failed to connect to ROM /build/mos-i_6ltm/mos-2.13.1+2034cc0~bionic0/obj-x86_64-linux-gnu/src/cesanta.com/mos/flash/esp/rom_client/rom_client.go:94: failed to create ROM client /build/mos-i_6ltm/mos-2.13.1+2034cc0~bionic0/obj-x86_64-linux-gnu/src/cesanta.com/mos/flash/esp/flasher/common.go:43: Failed to talk to bootloader. See https://github.com/espressif/esptool/wiki/ESP8266-Boot-Mode-Selection for wiring instructions or pull GPIO0 low and reset. /build/mos-i_6ltm/mos-2.13.1+2034cc0~bionic0/obj-x86_64-linux-gnu/src/cesanta.com/mos/flash/esp/flasher/flash.go:55: /build/mos-i_6ltm/mos-2.13.1+2034cc0~bionic0/obj-x86_64-linux-gnu/src/cesanta.com/mos/flash.go:201: /build/mos-i_6ltm/mos-2.13.1+2034cc0~bionic0/obj-x86_64-linux-gnu/src/cesanta.com/mos/main.go:178: flash failed
Is it possible to use esptool directly to load mongoose os firmware into ESP32?