7a6a5b7bd0
The main features are:
1. DMA2D interface
Supports the nuttx pixel formats:
- FB_FMT_RGB8
- FB_FMT_RGB24
- FB_FMT_RGB16_565
Dynamic layer allocation during runtime for the supported formats
- The number of allocatable layer can be configured.
Supported dma2d operation:
- blit (Copy content from source to destination layer) also works with
selectable area.
- blend (Blend two layer and copy the result to a destination layer wich can
be a third layer or one of the source layer) also works with selectable
area.
- fillarea (Fill a defined area of the whole layer with a specific color)
As a result of that the dma2d controller can't transfer data from the core coupled memory, CCM is disabled but usable by the ccm allocator. Currently the ccm allocator is used for allocating the layer structurei only. For the dma memory (layers frame buffer) memory is allocated from heap 2 and 3.
2. LTDC interface
I have changed the api for the currently non implemented operations:
- blit (Copy content from a dma2d layer to an ltdc layer) also works with
selectable area.
- blend (Blend two dma2d layer and copy the result to a destination ltdc
layer) also works with selectable area.
Note! ltdc layer is a layer referenced by the ltdc interface. dma2d layer
is a layer referenced by the dma2d interface.
One of the most important questions for me was, How can i flexible use an
ltdc layer with the dma2d interface, e.g. as source layer for dma2d
operations?
Get the layer id of the related dma2d layer by a special flag when using
getlid() function of the ltdc interface and use the layer id to reference
the specific dma2d layer by the dma2d interface.
The ltdc coupled dma2d layers are predefined and can't be dynamically
allocated of freed. They use the same frame buffer memory and the same
color lookup table.
Changes:
- layer internal format of the clut table
- interrupt handling for register reload (vertical vblank) instead using
waiting loop
- small fixes and refactoring
From Marco Krahl.
158 lines
5.7 KiB
C
158 lines
5.7 KiB
C
/************************************************************************************
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* arch/arm/src/stm32/stm32_ltdc.h
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*
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* Copyright (C) 2013-2014 Ken Pettit. All rights reserved.
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* Authors: Ken Pettit <pettitd@gmail.com>
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* Marco Krahl <ocram.lhark@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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#ifndef __ARCH_ARM_SRC_STM32_STM32_LTDC_H
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#define __ARCH_ARM_SRC_STM32_STM32_LTDC_H
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <semaphore.h>
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#include <nuttx/video/fb.h>
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#include <nuttx/nx/nxglib.h>
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#include <arch/chip/ltdc.h>
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#ifdef CONFIG_STM32_LTDC
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/************************************************************************************
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* Public Types
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************************************************************************************/
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/* Common layer state structure for the LTDC and DMA2D controller */
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struct stm32_ltdc_s
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{
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/* Fixed settings */
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int lid; /* Layer identifier */
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struct fb_videoinfo_s vinfo; /* Layer videoinfo */
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struct fb_planeinfo_s pinfo; /* Layer planeinfo */
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/* Positioning */
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struct ltdc_area_s area; /* Active layer area */
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fb_coord_t xpos; /* Reference x position */
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fb_coord_t ypos; /* Reference y position */
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/* Coloring */
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uint32_t color; /* Layer color definition */
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#ifdef CONFIG_FB_CMAP
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uint32_t *clut; /* 32-bit aligned clut color table */
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#endif
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/* Blending */
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uint8_t alpha; /* Layer constant alpha value */
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uint32_t colorkey; /* Layer colorkey */
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uint32_t blendmode; /* Layer blend factor */
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/* Operation */
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sem_t *lock; /* Ensure mutually exclusive access */
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};
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/************************************************************************************
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* Public Data
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/* The STM32 LTDC driver uses the common framebuffer interfaces declared in
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* include/nuttx/video/fb.h.
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*/
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int stm32_ltdcinitialize(void);
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FAR struct fb_vtable_s *stm32_ltdcgetvplane(int vplane);
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void stm32_ltdcuninitialize(void);
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/************************************************************************************
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* Name: stm32_ltdcgetlayer
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*
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* Description:
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* Get the ltdc layer structure to perform hardware layer operation
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*
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* Parameter:
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* lid - Layer identifier
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*
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* Return:
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* Reference to the layer control structure on success or Null if parameter
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* invalid.
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*
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************************************************************************************/
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FAR struct ltdc_layer_s *stm32_ltdcgetlayer(int lid);
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/************************************************************************************
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* Name: stm32_lcdclear
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*
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* Description:
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* This is a non-standard LCD interface just for the STM32 LTDC. Clearing the
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* display in the normal way by writing a sequences of runs that covers the
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* entire display can be slow. Here the display is cleared by simply setting
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* all video memory to the specified color.
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*
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************************************************************************************/
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void stm32_lcdclear(nxgl_mxpixel_t color);
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/************************************************************************************
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* Name: stm32_lcd_backlight
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*
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* Description:
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* If CONFIG_STM32_LCD_BACKLIGHT is defined, then the board-specific logic must
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* provide this interface to turn the backlight on and off.
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*
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************************************************************************************/
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#ifdef CONFIG_STM32_LCD_BACKLIGHT
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void stm32_backlight(bool blon);
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#endif
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#endif /* CONFIG_STM32_LTDC */
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#endif /* __ARCH_ARM_SRC_STM32_STM32_LTDC_H */
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