Utility library to allow flashing esp chips from within toit

This package implements (parts of) the esp serial flasher protocol

For simple usage from an ESP32 host, to flash another ESP32 host:

import esp_serial_flasher show *

BLOCKSIZE ::= 0x1000

// blocks is a list of bytearrays of size BLOCKSIZE
flash offset/int blocks/List gpio0 en rx tx:
  flasher := Flasher --host=(Esp32Host --gpio0_pin=gpio0 --enable_pin=en --rx_pin=rx --tx_pin=tx)
  target := flasher.connect
  image_flasher := target.start_flash offset blocks.size*BLOCKSIZE BLOCKSIZE
  blocks.do: image_flasher.write it

If special host control is needed, implement the HostAdapter

To speed up the flash, change the baud rate with Target.change_baud_rate