ESP32 execute esp.read_flash() cause exception

• 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~

Start with the documented esp.flash_read API and reproduce the shown call, then compare its expected buffer argument with the behavior reported here. Also review the esp32.Partition entry point for the requested block read and write use case. Done means the API behavior and supported call shape are clear and consistent with the documentation.