Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Alif Semiconductor/AE302F80F5582LE_CM55_HE_View/GPU2D/GPU2D_COLOR1#0x0
COLOR1_ALPHA=Val_0x0
Base Color Register
Blue channel of color1
Green channel of color1
Red channel of color1
Alpha channel of color1
0 (Val_0x0): Transparent
255 (Val_0xFF): Opaque
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https://github.com/cmsis-svd/cmsis-svd-data