USE SLIP:

https://www.rfc-editor.org/rfc/rfc1055.html

USE SLIP PACK THE FRAME:

[OPCODE 8BIT][OFFSET LOW8BIT][OFFSET HIGH8BIT][ LCD DATA ....... ]
   0x01         0xNN             0xNN            0xNN .. 0xNN

RECEIVER WILL COPY LCD DATA TO LCD FRAMEBUFFER + OFFSET

HIGH SPEED UART NEED A STABLE CLOCK SOURCE

WE NEED RUN SENDER IN LOOP, TO AVOID NOISE AND FIFO OVERFLOW

I SUGGEST YOU USE LZ4 BLOCK FORMAT:

USE lz4len CHECK THE DATA AND USE lz4cpy TO DECOMPRESS INTO FRAMEBUFFER, OR YOU CAN MODIFY lz4cpy TO LIMIT THE OUTPUT POINTER

https://github.com/jart/cosmopolitan/blob/master/libc/str/lz4len.c

https://github.com/jart/cosmopolitan/blob/master/libc/str/lz4cpy.c