/**
@page LTDC_AnimatedPictureFromSDCard LTDC animated picture from SD card application
@verbatim
******************************************************************************
* @file Display/LTDC_AnimatedPictureFromSDCard/readme.txt
* @author MCD Application Team
* @brief Description of the LTDC animated picture from SD card application.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@endverbatim
@par Application Description
This application describes how to display on LCD an animated picture saved under
microSD.
The animated picture is the display of a sequence of images with a determined
frequency to be seen like one animated image.
The user has to copy the two directories "BACK" and "TOP" available
with this under "/Utilities/Media/Pictures/Animated" under the micro SD card root.
* Background picture display
----------------------------
Once the LCD, SD card and file system are initialized and configured, a check
of the existence and the content of the "/BACK" directory is done.
* Foreground animated pictures display
-------------------------------------
A content check of the "/TOP" directory is done and the number of ".BMP" files
is retained.
@note : The maximum number of BMP file is fixed at 25. It can be raised
until reaching the maximum of SD card memory space.
@note : the system clock (SYSCLK) is configured to run at 175 MHz and 50 MHz is provided
at the output PLL divided by PLL_Q. This frequency permit to reach 25 MHz clock
needed for SD operation and in line with microSD specification.
@note : When the SDcard is used the Camera module must be unplugged, this is due to
the shared pins between the two devices.
The following steps are performed to scroll all the images stored in the
SD Card :
- The foreground layer is set, the image copied from SD card (from "/TOP" directory)
to intermediate SDRAM memory space and then copied to LCD frame buffer.
- The color keying feature is applied to remove the bottom of foreground layer (transparent)
and then replaced by the background layer.
- Jump to next image
@note :
=> If the "/Foreground" directory is empty, a warning message is displayed on the LCD :
" No Bitmap files... "
=> If the file type stored in the "/BACK" or "/TOP" directories is not supported,
a warning message is displayed on the LCD : " file type not supported. "
=> If the SD card is not inserted, a warning message is displayed on the LCD :
" Please insert SD Card. "
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
- LED3 is ON when the uSD disk I/O driver is not Linked;
@par Keywords
Graphic, Display, LCD, Pictures, SD Card, BMP, Background, Foreground, Layers,
@par Directory contents
- Display/LTDC_AnimatedPictureFromSDCard/Inc/main.h Main configuration file
- Display/LTDC_AnimatedPictureFromSDCard/Inc/sd_diskio.h FatFS sd diskio driver header file
- Display/LTDC_AnimatedPictureFromSDCard/Inc/stm32f4xx_it.h Interrupt handlers header file
- Display/LTDC_AnimatedPictureFromSDCard/Inc/stm32f4xx_hal_conf.h HAL Configuration file
- Display/LTDC_AnimatedPictureFromSDCard/Inc/ffconf.h FAT file system module configuration file
- Display/LTDC_AnimatedPictureFromSDCard/Inc/fatfs_storage.h Header for fatfs_storage.c
- Display/LTDC_AnimatedPictureFromSDCard/Src/main.c Main program
- Display/LTDC_AnimatedPictureFromSDCard/Src/sd_diskio.c FatFS sd diskio driver implementation
- Display/LTDC_AnimatedPictureFromSDCard/Src/fatfs_storage.c Storage (FatFs) driver
- Display/LTDC_AnimatedPictureFromSDCard/Src/stm32f4xx_it.c Interrupt handlers
- Display/LTDC_AnimatedPictureFromSDCard/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
@par Hardware and Software environment
- This application runs on and STM32F429xx/439xx devices.
- This application has been tested with STMicroelectronics STM324x9I-EVAL RevB
evaluation boards and can be easily tailored to any other supported device
and development board.
@par How to use it ?
In order to make the program work, you must do the following :
- The two directories "BACK" and "TOP" under "/Utilities/Media/Pictures/Animated"
folder must be copied at the micro SD card root.
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the application
*/
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