TI-nspire communication with sim800l module

https://dev.creery.org/Projects/Send%20Texts%20from%20a%20Calculator

/sim800

Where the main code lies.

/serial

A simple serial console for debugging the nspire IO. Also acts as as a library for /sim800

/lvgl-testing

An attempt to port LVGL to the nspire.

/testing

Messing around with c language.