commit cbec4753e189bcee954eecef829973004b8c415f
author Greter Raffael <rgreter@baumer.com> Fri Feb 02 13:33:06 2024 +0000
committer Alberto Escolar <alberto.escolar.piedras@nordicsemi.no> Fri Mar 01 09:02:22 2024 +0100
tree 27c3f0a5dcf34fd9259e2dac7dc3b8c8681636c4
parent 19610233e2e4bb64a42214c2fb8b9ca1885c7410

drivers: display: ssd1306: Invert colors at runtime

This allows to invert the display at runtime using the function
`ssd1306_set_pixel_format`. The current format is stored in the data
struct.

Also adjusted `ssd1306_get_capabilities` to return both supported
formats and the current one.

From the ssd1306 doc: 'In normal display a RAM data of 1 indicates an
"ON" pixel while in inverse display a RAM data of 0 indicates an "ON"
pixel.' Thus `PIXEL_FORMAT_MONO01 == SSD1306_SET_NORMAL_DISPLAY`.

Signed-off-by: Greter Raffael <rgreter@baumer.com>

drivers/display/ssd1306_regs.h

diff --git a/drivers/display/ssd1306_regs.h b/drivers/display/ssd1306_regs.h
index 33961e1..04092a8 100644
--- a/drivers/display/ssd1306_regs.h
+++ b/drivers/display/ssd1306_regs.h
@@ -28,7 +28,9 @@
 #define SSD1306_SET_ENTIRE_DISPLAY_OFF		0xa4
 #define SSD1306_SET_ENTIRE_DISPLAY_ON		0xa5
 
+/* RAM data of 1 indicates an "ON" pixel */
 #define SSD1306_SET_NORMAL_DISPLAY		0xa6
+/* RAM data of 0 indicates an "ON" pixel */
 #define SSD1306_SET_REVERSE_DISPLAY		0xa7
 
 #define SSD1306_DISPLAY_OFF			0xae