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drivers: display: Fix Black White Red SSD16xx displays #90075

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Merged
kartben merged 1 commit into from
May 25, 2025
Merged

drivers: display: Fix Black White Red SSD16xx displays #90075

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11 changes: 10 additions & 1 deletion drivers/display/ssd16xx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -645,7 +645,16 @@ static int ssd16xx_clear_cntlr_mem(const struct device *dev, uint8_t ram_cmd)
return err;
}

memset(clear_page, 0xff, sizeof(clear_page));
if (config->profiles[SSD16XX_PROFILE_PARTIAL] == NULL
&& ram_cmd == SSD16XX_CMD_WRITE_RED_RAM) {
/* Display doesn't support partial refresh, so it either doesn't matter what is in
* red Ram, or it needs to be inverted because this is a black/white/red display
* and for red 0 is off, the opposite of black.
*/
memset(clear_page, 0x00, sizeof(clear_page));
} else {
memset(clear_page, 0xff, sizeof(clear_page));
}
for (int h = 0; h < panel_h; h++) {
size_t x = config->width;

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