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Fix display coherency problem when D-cache is enabled #455

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Fix display coherency problem when D-cache is enabled #455

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8 changes: 5 additions & 3 deletions boards/stm32_common/dma2d/stm32-dma2d_bitmap.adb
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
------------------------------------------------------------------------------
-- --
-- Copyright (C) 2015-2016, AdaCore --
-- Copyright (C) 2015-2026, AdaCore --
-- --
-- Redistribution and use in source and binary forms, with or without --
-- modification, are permitted provided that the following conditions are --
Expand Down Expand Up @@ -153,15 +153,17 @@ package body STM32.DMA2D_Bitmap is
X => Area.Position.X,
Y => Area.Position.Y,
Width => Area.Width,
Height => Area.Height);
Height => Area.Height,
Synchronous => True);
else
DMA2D_Fill_Rect
(DMA_Buf,
Color => Buffer.Native_Source,
X => Area.Position.Y,
Y => Buffer.Width - Area.Position.X - Area.Width,
Width => Area.Height,
Height => Area.Width);
Height => Area.Width,
Synchronous => True);
end if;
else
Parent (Buffer).Fill_Rect (Area);
Expand Down
9 changes: 8 additions & 1 deletion boards/stm32_common/ltdc/framebuffer_ltdc.adb
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
------------------------------------------------------------------------------
-- --
-- Copyright (C) 2015-2016, AdaCore --
-- Copyright (C) 2015-2026, AdaCore --
-- --
-- Redistribution and use in source and binary forms, with or without --
-- modification, are permitted provided that the following conditions are --
Expand Down Expand Up @@ -32,6 +32,7 @@
with STM32.DMA2D.Interrupt;
with STM32.DMA2D.Polling;
with STM32.SDRAM; use STM32.SDRAM;
with Cortex_M.Cache;

package body Framebuffer_LTDC is

Expand Down Expand Up @@ -377,12 +378,18 @@ package body Framebuffer_LTDC is
null;
when 1 =>
Display.Buffers (LCD_Layer, 2).Wait_Transfer;
Cortex_M.Cache.Clean_DCache
(Display.Buffers (LCD_Layer, 2).Addr,
Display.Buffers (LCD_Layer, 2).Buffer_Size);
STM32.LTDC.Set_Frame_Buffer
(Layer => LCD_Layer,
Addr => Display.Buffers (LCD_Layer, 2).Addr);
Display.Current (LCD_Layer) := 2;
when 2 =>
Display.Buffers (LCD_Layer, 1).Wait_Transfer;
Cortex_M.Cache.Clean_DCache
(Display.Buffers (LCD_Layer, 1).Addr,
Display.Buffers (LCD_Layer, 1).Buffer_Size);
STM32.LTDC.Set_Frame_Buffer
(Layer => LCD_Layer,
Addr => Display.Buffers (LCD_Layer, 1).Addr);
Expand Down
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