docs/library/pyb.Flash.rst · QuecPython/microPython

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pyb.Flash.rst

pyb.Flash.rst 1.88 KB

.. currentmodule:: pyb
.. _pyb.Flash:

class Flash -- access to built-in flash storage
===============================================

The Flash class allows direct access to the primary flash device on the pyboard.

In most cases, to store persistent data on the device, you'll want to use a
higher-level abstraction, for example the filesystem via Python's standard file
API, but this interface is useful to :ref:`customise the filesystem
configuration <filesystem>` or implement a low-level storage system for your
application.

Constructors
------------

.. class:: pyb.Flash()

Create and return a block device that represents the flash device presented
 to the USB mass storage interface.

It includes a virtual partition table at the start, and the actual flash
 starts at block ``0x100``.

This constructor is deprecated and will be removed in a future version of MicroPython.

.. class:: pyb.Flash(*, start=-1, len=-1)
 :noindex:

Create and return a block device that accesses the flash at the specified offset. The length defaults to the remaining size of the device.

The *start* and *len* offsets are in bytes, and must be a multiple of the block size (typically 512 for internal flash).

Methods
-------

.. method:: Flash.readblocks(block_num, buf)
 Flash.readblocks(block_num, buf, offset)
.. method:: Flash.writeblocks(block_num, buf)
 Flash.writeblocks(block_num, buf, offset)
.. method:: Flash.ioctl(cmd, arg)

These methods implement the simple and :ref:`extended
 <block-device-interface>` block protocol defined by
 :class:`uos.AbstractBlockDev`.

Hardware Note
-------------

On boards with external spiflash (e.g. Pyboard D), the MicroPython firmware will
be configured to use that as the primary flash storage. On all other boards, the
internal flash inside the :term:`MCU` will be used.

一键复制编辑原始数据按行查看历史

chenchi 提交于 2021年06月03日 16:44 +08:00 . first commit

.. currentmodule:: pyb

class Flash -- access to built-in flash storage

The Flash class allows direct access to the primary flash device on the pyboard.

In most cases, to store persistent data on the device, you'll want to use a higher-level abstraction, for example the filesystem via Python's standard file API, but this interface is useful to :ref:`customise the filesystem configuration <filesystem>` or implement a low-level storage system for your application.

Constructors

Create and return a block device that represents the flash device presented to the USB mass storage interface.

It includes a virtual partition table at the start, and the actual flash starts at block 0x100.

This constructor is deprecated and will be removed in a future version of MicroPython.

Create and return a block device that accesses the flash at the specified offset. The length defaults to the remaining size of the device.

The start and len offsets are in bytes, and must be a multiple of the block size (typically 512 for internal flash).

Methods

.. method:: Flash.readblocks(block_num, buf)
 Flash.readblocks(block_num, buf, offset)

.. method:: Flash.writeblocks(block_num, buf)
 Flash.writeblocks(block_num, buf, offset)

.. method:: Flash.ioctl(cmd, arg)

 These methods implement the simple and :ref:`extended
 <block-device-interface>` block protocol defined by
 :class:`uos.AbstractBlockDev`.

Hardware Note

On boards with external spiflash (e.g. Pyboard D), the MicroPython firmware will be configured to use that as the primary flash storage. On all other boards, the internal flash inside the :term:`MCU` will be used.