SerialSD is a project to manage configuration and log file via serial.
This project needs one Arduino's compatible board and SdFat library.

This software must be upload into an Arduino's board with SD Adapter and this memory must be formatted in FAT32.
Afterwards, creation of non-empty single file named CONFIG.TXT is required with a syntax like this:

key1:value1
key2:value2

":" is the default delimiter.

Then, connect RX and TX pin to your main board project and start to send serial requests.

For the sake of simplicity, a serial request has the same config file's syntax.
Serial has \n terminator and it was set 150 like maximum buffer size .
Actually, there are these commands:

• GET:key return value from key.
• LOG:hello write into log file hello string. If file doesn't exist, it will be created.
• ACK:test return the same request's string. This is useful when you want to know if system are available.

For the first part, case is insensitive. For each request, the result can be OK or ERR. When you got ERR, there are only some cases:

• KEY_NOT_FOUND When you GET a key which doesn't exist.
• IMPOSSIBLE_WRITE When you LOG but there're problems with SD.
• BAD_REQUEST When format request is invalid.
• MAX_TIMEOUT_REACH When Serial has recorded some bytes, but there's no terminator in 3 seconds.

SerialSD must be always on. So, all errors return a SYSERR and cause a sotware reset after 10 seconds.
Some possible troubles:

• FILE_NOT_FOUND some required files weren't found.
• BEGIN_SD_FAILED SdFat library begin failed.
• UNKNOWN Unknown errors.

To add your key configuration, go to configuration.h and insert your logic.

test folder has many bash script files and you can launch them to test requests:

test/test_ack.sh /dev/ttyUSB0