Asked for help on the LVGL forum, and the author suggested changing the color format – it works!
[cbrake@ceres git]$ git diff
diff --git a/lv_conf.h b/lv_conf.h
index 6bfe50f..e83dc55 100644
--- a/lv_conf.h
+++ b/lv_conf.h
@@ -24,7 +24,7 @@
*====================*/
/*Color depth: 1 (1 byte per pixel), 8 (RGB332), 16 (RGB565), 32 (ARGB8888)*/
-#define LV_COLOR_DEPTH 32
+#define LV_COLOR_DEPTH 16
/*Swap the 2 bytes of RGB565 color. Useful if the display has an 8-bit interface (e.g. SPI)*/
#define LV_COLOR_16_SWAP 0
Touchscreen is not working yet, so that is the next project …