Re: [PATCH v2] auxdisplay: hd44780: move cursor home after clear display command

Miguel Ojeda
2023-08-20T00:11:35Z

On Sat, Jul 22, 2023 at 8:09 PM Hugo Villeneuve <hugo@hugovil.com> wrote:
>
> From: Hugo Villeneuve <hvilleneuve@dimonoff.com>
>
> The DISPLAY_CLEAR command on the NewHaven NHD-0220DZW-AG5 display
> does NOT change the DDRAM address to 00h (home position) like the
> standard Hitachi HD44780 controller. As a consequence, the starting
> position of the initial string LCD_INIT_TEXT is not guaranteed to be
> at 0,0 depending on where the cursor was before the DISPLAY_CLEAR
> command.
>
> Extract of DISPLAY_CLEAR command from datasheets of:
>
> Hitachi HD44780:
> ... It then sets DDRAM address 0 into the address counter...
>
> NewHaven NHD-0220DZW-AG5 datasheet:
> ... This instruction does not change the DDRAM Address
>
> Move the cursor home after sending DISPLAY_CLEAR command to support
> non-standard LCDs.
>
> Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Applied to `auxdisplay` -- thanks everyone!

Cheers,
Miguel