mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
synced 2025-04-30 13:48:52 +08:00
/**
@page LTDC_Display_1Layer LTDC Display Layer 1 example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file LTDC/LTDC_Display_1Layer/readme.txt
* @author MCD Application Team
* @brief Description of the LTDC Display Layer 1 example.
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2017 STMicroelectronics</center></h2>
*
* Copyright (c) 2017 STMicroelectronics. All rights reserved.
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
@endverbatim
@par Example Description
This example provides a description of how to configure LTDC peripheral to
display BMP image on LCD using only one layer.
In this basic example the goal is to explain the different fields of the LTDC
structure.
At the beginning of the main program the HAL_Init() function is called to reset
all the peripherals, initialize the Flash interface and the systick.
Then the SystemClock_Config() function is used to configure the system
clock (SYSCLK) to run at 180 MHz.
After LCD initialization, the LCD layer 1 is configured to display image
(modeled by an array) loaded from flash memory.
@note :
The C file of the image used in this example are generated with
STemWin bitmap converter released with this package.
\Middlewares\ST\STemWin\Software\BmpCvtST.exe
Use the bitmap file under resources repository
LCD_TFT synchronous timings configuration :
-------------------------------------------
Total Width
<--------------------------------------------------->
Hsync width HBP Active Width HFP
<---><--><--------------------------------------><-->
____ ____|_______________________________________|____
|___| | | |
| | |
__| | | |
/|\ /|\ | | | |
| VSYNC| | | | |
|Width\|/ |__ | | |
| /|\ | | | |
| VBP | | | | |
| \|/_____|_________|_______________________________________| |
| /|\ | | / / / / / / / / / / / / / / / / / / / | |
| | | |/ / / / / / / / / / / / / / / / / / / /| |
Total | | | |/ / / / / / / / / / / / / / / / / / / /| |
Heigh | | | |/ / / / / / / / / / / / / / / / / / / /| |
|Active| | |/ / / / / / / / / / / / / / / / / / / /| |
|Heigh | | |/ / / / / / Active Display Area / / / /| |
| | | |/ / / / / / / / / / / / / / / / / / / /| |
| | | |/ / / / / / / / / / / / / / / / / / / /| |
| | | |/ / / / / / / / / / / / / / / / / / / /| |
| | | |/ / / / / / / / / / / / / / / / / / / /| |
| | | |/ / / / / / / / / / / / / / / / / / / /| |
| \|/_____|_________|_______________________________________| |
| /|\ | |
| VFP | | |
\|/ \|/_____|______________________________________________________|
Each LCD device has its specific synchronous timings values.
This example uses AM480272H3TMQW-T01H LCD (MB1046 Rev.A) and configures
the synchronous timings as following :
Horizontal Synchronization (Hsync) = 41
Horizontal Back Porch (HBP) = 2
Active Width = 480
Horizontal Front Porch (HFP) = 2
Vertical Synchronization (Vsync) = 10
Vertical Back Porch (VBP) = 2
Active Heigh = 272
Vertical Front Porch (VFP) = 2
LCD_TFT windowing configuration :
---------------------------------
To configure the active display window, this example configures the
horizontal/vertical start and stop.
HorizontalStart = (Offset_X + Hsync + HBP);
HorizontalStop = (Offset_X + Hsync + HBP + Window_Width - 1);
VarticalStart = (Offset_Y + Vsync + VBP);
VerticalStop = (Offset_Y + Vsync + VBP + Window_Heigh - 1);
Window_width and Window_heigh should be in line with the image size to be
displayed.
STM32 Eval board's LED can be used to monitor the transfer status:
- LED3 is ON when there is an error in Init process.
@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.
@par Keywords
Display, LTDC, Display Controller, TFT, LCD, Graphic, RGB888, 1 Layer, BMP
@par Directory contents
- LTDC/LTDC_Display_1Layer/Inc/main.h Main configuration file
- LTDC/LTDC_Display_1Layer/Inc/stm32f4xx_it.h Interrupt handlers header file
- LTDC/LTDC_Display_1Layer/Inc/stm32f4xx_hal_conf.h HAL configuration file
- LTDC/LTDC_Display_1Layer/Inc/RGB565_480x272.h Image to be displayed
- LTDC/LTDC_Display_1Layer/Src/main.c Main program
- LTDC/LTDC_Display_1Layer/Src/stm32f4xx_it.c Interrupt handlers
- LTDC/LTDC_Display_1Layer/Src/stm32f4xx_hal_msp.c HAL MSP module
- LTDC/LTDC_Display_1Layer/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
@par Hardware and Software environment
- This example runs on STM32F429xx/STM32F439xx devices.
- This example 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 :
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the example
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/