This was reasonably fast using my WeMOS board, but runs at glacially slow speed with my Sparkfun thing board. No doubt because the "thing" has a 26 Mhz crystal and there is some baud rate mismatch. I am surprised that it runs at all. This may be something I will want to iron out before I start loading code into the "thing".
Once I read out the image from both of these boards and compared them, it turned out that they are identical, which is what you would expect. Both are ESP32-D0WDQ6 chips.
# Makefile for ESP32 reverse engineering # Tom Trebisky 5-12-2018 # # currently on my system the following # environment variable is set: # IDF_PATH=/opt/esp32/esp-idf all: @echo "You need to be more specific" #PORT = /dev/ttyUSB1 PORT = /dev/ttyUSB2 ESPTOOL = $(IDF_PATH)/components/esptool_py/esptool/esptool.py -p $(PORT) info: $(ESPTOOL) read_mac $(ESPTOOL) flash_id #ROM0_SIZE = 65536 * 5 ROM0_SIZE = 393216 ROM1_SIZE = 65536 rom1: $(ESPTOOL) dump_mem 0x3ff90000 $(ROM1_SIZE) esp32_rom1.bin rom0: $(ESPTOOL) dump_mem 0x40000000 $(ROM0_SIZE) esp32_rom0.bin
Tom's Computer Info / firstname.lastname@example.org