[原创] STM32F7之LCD驱动学习（LTDC 双图层）

caizhiwei 2015-10-25 20:27 楼主

1.Example Description This example provides a description of how to configure LTDC peripheral to display a BMP image of size 480x272 and format RGB888 (24 bits/pixel) 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 216 MHz. After LCD initialization, the LCD layer 1 is configured to display an image (modelled by an array) loaded directly from flash memory by LTDC integrated DMA. 2. LCD_TFT synchronous timings configuration : ------------------------------------------- Each LCD device has its specific synchronous timings values. This example uses AM480272H3TMQW-T01H LCD (MB1046 B-01) and configures the synchronous timings as following : Horizontal Synchronization (Hsync) = 41 Horizontal Back Porch (HBP) = 13 Active Width = 480 Horizontal Front Porch (HFP) = 32 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. 3.STM32 Discovery board's LED can be used to monitor the transfer status: - LED1 is ON when there is an error in Init process.