UART2NAND

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Interface for exposing raw NAND i/o over UART to enable pc-side modification.

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# UART2NAND
Interface for exposing raw NAND i/o over UART to enable pc-side modification.

Code is messy and lacks documentation but currently enables reading, flashing, and page-erasing of raw NAND using UART. 
See nand_example.py for a set of simple examples of how to interface software-side in a way that can be automated.

Plan to rebase this tool from being a linear state machine Soon(tm).

## INTERFACE
To interface with the NAND, set up a UART bridge between your PC and the FPGA, and send commands of the following format:

```
"[command byte]:[address]:[data]"
```

Where command byte is one of the following:

* "P" -- Program
 * "R" -- Read
 * "E" -- Erase

Address is 5 bytes, with the first 3 being row address and the last 2 being column address.

Data is 2112 bytes (2048 data bytes + 64 "spare" bytes)

Each field needs 1 byte between them. This byte will be ignored by the hardware, meaning the developer can use whatever character they choose for separation. I used ":", resulting in a command structure that looked like:

```
P:iiiii:xxxxxxxx....xxxx (dots fill in space so that there are 2112 x's)
```

In this example, we write to address 0x6969696969 ("iiiii") (not normally accessible on any SLC flash chip), and write the byte 0x78 2112 times.

NOTE: A command will always result in the hardware spitting back out its command as a way to simplify design. In the case of read operations, the 2112 data bytes will overwrite the 2112 data bytes of the sent command.

See nand_example.py if any of this doesn't make sense.

## DISCLAIMER
I make no claims of stability and assume no responsibility for potential damages to devices that may be caused by this code, use at your own risk.

## LICENSE
This project assumes an MIT License. If you need to use this in a way that works outside that license, feel free to contact me.

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