FRAM Simple File System

USST-RADSAT-SK / software-and-command

Code and Documentation for USST’s RADSAT-SK in their first Canadian CubeSat Project

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FRAM Simple File System #38

Open tyrelkostyk opened 3 years ago

tyrelkostyk commented 3 years ago

The FRAM chip won't be used for much, so I think that a simple hardcoded "File System" layer that has internal hardcoded Flash addresses, and then just provides a simple public API for reading private keys, etc.

matthew-buglass commented 3 years ago

Notes:

Hard-coded address
Separate files
Directly use HAL functions to protect blocks
See software-and-command/hal/docs/doxygen/_f_r_a_m_8h.html
Uses stack, so store at highest address

matthew-buglass commented 3 years ago

Planning Stuff:

[x] KiB (2^10)
[x] What is the highest address (0x3DFAF)/Where to write to (128-bit key)
[x] What else do we need to store
- Key and IV
[x] How many bits are between addresses (8-bit addresses)

matthew-buglass commented 3 years ago

Process:

Initialize FRAM
Write key and IV
Pass _FRAMblockProtect.blockProtect = 1 (protects upper 1/4 of FRAM)
Have a function to re-write
Read from many places to get a consensus and redundancy
Anything else?

matthew-buglass commented 3 years ago

Generalize to using all areas. FRAM, SD card(s) A few places. Get addresses later.