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| author | Hugo Villeneuve <[email protected]> | 2023-07-22 14:09:25 -0400 |
|---|---|---|
| committer | Miguel Ojeda <[email protected]> | 2023-08-19 21:53:49 +0200 |
| commit | 35b464e32c8bccef435e415db955787ead4ab44c (patch) | |
| tree | b27ebda1c8800c497743de3b8fee774ab3db13dc /tools/testing/selftests/bpf/prog_tests/autoload.c | |
| parent | 2ccdd1b13c591d306f0401d98dedc4bdcd02b421 (diff) | |
auxdisplay: hd44780: move cursor home after clear display command
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 <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Tested-by: David Reaver <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/autoload.c')
0 files changed, 0 insertions, 0 deletions