SPI NAND Flash Memory Drivers

Drivers for Micron NAND Flash

• Supported Models
  • MT29F2G01ABAGD
• Dependencies
  • STM32 L0 Series Hardware Abstraction Library (HAL)

Note: The STM32L0 HAL is used for SPI x1 data transfers to and from the NAND Flash IC. This driver set is meant to be used with STM32 Microcontrollers.

Version History

Ver.	Date	Comments
0.1	Jan 2022	In Development

Contents

In order of high level functions => hardware:

• nand_m79a:
  • Functions for reading and writing to M79a NAND Flash ICs
• nand_m79a_lld:
  • Low level drivers implementing individual commands and dealing with physical locations within the NAND
• nand_spi:
  • SPI wrapper functions used by NAND driver
  • Calls STM32L0 HAL Library to interface with hardware

Usage

• Clone this folder to Drivers/ in the STM32 IDE generated folder structure.
• Add to project by going to Project -> Properties -> C/C++ General -> Paths and Symbols -> Includes
• Add #include "nand_m79a.h" to main.c
• Make sure SPI and GPIO are set up (see NAND_SPI_Init and NAND_GPIO_Init in nand_spi.c for expected settings)

References

Documents

• Micron Product Catalog: MT29F2G01ABAGD
  • See link for Datasheet and Technical Note TN-29-17: NAND Flash Design and Use Considerations
• Technical Note TN-29-19: NAND Flash 101

Similar Drivers

• SPI Drivers for M68A NAND Flash from Micron Download: v1, 2011
• SPI Drivers for MT29F x8, x16 NAND Flash from Micron Download: v1.1, 2013
  • Technical Note TN-29-72: Software Drivers for MT29F Micron NAND Flash accompanies these drivers

To-Do List

Hardware

• Validate driver functions

Low level driver features (nand_m79a_lld)

• Finish implementing all of the commands

  • Read all registers, subfeatures
  • Read and write to spare areas
  • Move, lock operations
  • Read bad block bytes
  • Parameter page [Low priority]
  • OTP areas [Low priority]

• Optimize functions

  • NAND_Wait(1) wastes time.
    • No command takes that long to complete.
    • Compounds when calling the function multiple times.

Higher level features (nand_m79a)

• Handling storage levels and freeing up space as required [High priority]
• Bad-block management and mapping from logical addresses to physical locations [High priority]
• Wear leveling
• Error correction code (ECC)