A few days ago I have started with lvGL and I’m using the same board and mbed:
But it is in an early experimantal state and I have not published the porting yet. Give me a little more time and I will push it to github.
I have ported also mbed-os for this board, there you have a OS with or without RTOS and support for standard devices like GPIO, UART, SPI, I2C and more. I have written also a SDIO driver for using a SD card with mbed. This is not yet tied to lvGL, but should be easy because the stdio is working with this driver.
I’m using this board with the AdafruitGFX lib and FSMC driver, the lib has a drawBitmap function that matches exactly the needs for the lvGL driver. So I left the AdafruitGFX for initialising the FSMC and ILI9341 and copied the necessary part to the lvGL driver. So both gfx libs can be used.
mbed has an C++ API, so a C++ wrapper is the only thing I’m missing in lvGL. If you want to start with mbed, this is a good entry:
https://os.mbed.com/docs/mbed-os/v5.14/introduction/index.html#getting-started
and
The online compiler is good for starting also, but the offline CLI is much more powerful. It is written in Python and also availible for MacOS.