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class FlashArea – access to built-in flash storage

Uses Zephyr flash map API.

This class allows access to device flash partition data. Flash area structs consist of a globally unique ID number, the name of the flash device the partition is in, the start offset (expressed in relation to the flash memory beginning address per partition), and the size of the partition that the device represents. For fixed flash partitions, data from the device tree is used; however, fixed flash partitioning is not enforced in MicroPython because MCUBoot is not enabled.

Constructors

class zephyr.FlashArea(id, block_size)

Gets an object for accessing flash memory at partition specified by id and with block size of block_size.

id values are integers correlating to fixed flash partitions defined in the devicetree. A commonly used partition is the designated flash storage area defined as FlashArea.STORAGE if FLASH_AREA_LABEL_EXISTS(storage) returns true at boot. Zephyr devicetree fixed flash partitions are boot_partition, slot0_partition, slot1_partition, and scratch_partition. Because MCUBoot is not enabled by default for MicroPython, these fixed partitions can be accessed by ID integer values 1, 2, 3, and 4, respectively.

Methods

FlashArea.readblocks(block_num, buf)

FlashArea.readblocks(block_num, buf, offset)

FlashArea.writeblocks(block_num, buf)

FlashArea.writeblocks(block_num, buf, offset)

FlashArea.ioctl(cmd, arg)

These methods implement the simple and extended block protocol defined by os.AbstractBlockDev.