W25Q256JV Flash Driver

no_std driver for the Winbond W25Q256JV NOR flash chip.

• Async API using embedded-hal-async
• Blocking API using embedded-hal
• Implements embedded-storage-async and embedded-storage
• Optional littlefs2 adapter via LittlefsAdapter
• Optional defmt support

This crate is based on the w25q32jv driver by tweedegolf.

Usage Examples

Blocking API

use w25q256jv::W25q256jv;

let mut flash = W25q256jv::new(spi, hold, wp)?;

flash.blocking_erase_sector(0)?;
flash.blocking_write(0, b"hello")?;

let mut buf = [0u8; 5];
flash.blocking_read(0, &mut buf)?;

Async API

use w25q256jv::{W25q256jv, SECTOR_SIZE};

let mut flash = W25q256jv::new(spi, hold, wp)?;

flash.erase_range(0, SECTOR_SIZE).await?;
flash.write(0, b"hello").await?;

let mut buf = [0u8; 5];
flash.read(0, &mut buf).await?;

littlefs2 Adapter

Enable the littlefs2 feature and wrap the flash driver in LittlefsAdapter:

use typenum::{U16, U256};
use w25q256jv::{LittlefsAdapter, W25q256jv};

type FlashStorage<'a, SPI, HOLD, WP> = LittlefsAdapter<'a, SPI, HOLD, WP, U256, U16>;

let mut flash = W25q256jv::new(spi, hold, wp)?;
let mut storage = FlashStorage::new(&mut flash);

Cargo Features

• defmt: enables defmt::Format for Error
• littlefs2: enables LittlefsAdapter and littlefs2 integration
• readback-check: verifies writes and erases by reading back data (slower)

License

MIT