I'm currently in the the process of using my arduino with a multiplexer, the MCP23017 (uses I2C). I'm currently coding this from scratch.
Now, I'm able to send commands to the multiplexer which send this off to the LCD 44780 display. I can configure the display to be in 4bit mode and write data to the display.
Now, I would like to move the cursor to and address I specify. As I'm aware, the DDRAM is addressed from 0x80, 0x80 being the first column of the first row etc. Now if I try to move to the 5th position (0x84), the screen goes blank. I've tried this with another display too. I've tried a 16x2 and a 16x4 display modules.
This seems weird, as I'm able to set the device up to send characters to, but why cannot I specify an address to move my cursor to?
Seems weird. Does anyone know if you have to specify any special commands, before moving the cursor to an arbitrary address?