ESP32 execute esp.read_flash() cause exception

[walklinewang]

• firmware version: MicroPython v1.13-106-g893f75546-dirty on 2020-10-16

• customize partition table:

  name	type	sub-type	offset	size
  nvs	data	nvs	0x9000	0x6000
  phy_init	data	phy	0xf000	0x1000
  factory	app	factory	0x10000	0x180000
  vfs	data	fat	0x200000	0x1ff000
  user_data	data	fat	0x3ff000	0x1000

• executed code:

  >>> import esp32
  >>> part=esp32.Partition
  >>> part.find(type=part.TYPE_DATA)
  [<Partition type=1, subtype=2, address=36864, size=24576, label=nvs, encrypted=0>, <Partition type=1, subtype=1, address=61440, size=4096, label=phy_init, encrypted=0>, <Partition type=1, subtype=129, address=2097152, size=2093056, label=vfs, encrypted=0>, <Partition type=1, subtype=129, address=4190208, size=4096, label=user_data, encrypted=0>]
  >>> user=part("user_data")
  >>> user.info()
  (1, 129, 4190208, 4096, 'user_data', False)
  >>>
  >>>
  >> import esp
  >>> esp.flash_size()
  4194304
  >>> esp.flash_write(0x3ff000, b'walkline')
  >>> esp.flash_read(0x3ff000, 0x10)
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: object with buffer protocol required
  >>>
  

According to the doc, the 2nd param is a length of buffer that I want to read, but why it raise a TypeError to me?

BTW, are there anyone knows how to use esp32.Partition to read and write blocks?

Thanks~

[walklinewang]

I found the difference between ESP32 and ESP8266, ESP8266 can directly pass in the length param, but ESP32 have to pass in a bytearray variable

>>> import esp
>>> buff=bytearray(8)
>>> esp.flash_read(0x3ff000, buff)
>>> buff
bytearray(b'walkline')

[dpgeorge]

This needs an update to the docs to state that esp32 doesn't support passing a length, just buffer.