Lcd i2c VDL CODE GROVE 16X2 V2

Hello .
lcd i2c , I need the flowchart, how to read ascii character from lcd, ROM or RAM ,to write it to lcd ?
what next steps require after initial to write ascii letter to lcd.
I need it to write vhdl code.
I use grove 16x2 v2.

Regards Raphy

what are the next steps after initial requeued to read ascii letters from Ram.