keil程序编写代码打开STM32H747XIH6的LCD屏幕

好的，以下是使用Keil编写的STM32H747XIH6的LCD屏幕初始化代码：

#include "stm32h7xx_hal.h"

#define LCD_WIDTH  800
#define LCD_HEIGHT 480

LTDC_HandleTypeDef hltdc;
static DMA2D_HandleTypeDef hdma2d;

void LCD_Init(void)
{
    // 启用LTDC时钟
    __HAL_RCC_LTDC_CLK_ENABLE();
    
    // LTDC初始化
    hltdc.Instance = LTDC;
    hltdc.Init.HSPolarity = LTDC_HSPOLARITY_AL;
    hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AL;
    hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
    hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
    hltdc.Init.HorizontalSync = 3;
    hltdc.Init.VerticalSync = 3;
    hltdc.Init.AccumulatedHBP = 46;
    hltdc.Init.AccumulatedVBP = 23;
    hltdc.Init.AccumulatedActiveW = 846;
    hltdc.Init.AccumulatedActiveH = 503;
    hltdc.Init.TotalWidth = 856;
    hltdc.Init.TotalHeigh = 525;
    hltdc.Init.Backcolor.Blue = 0;
    hltdc.Init.Backcolor.Green = 0;
    hltdc.Init.Backcolor.Red = 0;
    HAL_LTDC_Init(&hltdc);
    
    // 使能LTDC
    __HAL_LTDC_ENABLE(&hltdc);
    
    // DMA2D初始化
    hdma2d.Instance = DMA2D;
    hdma2d.Init.Mode = DMA2D_R2M;
    hdma2d.Init.ColorMode = DMA2D_OUTPUT_RGB565;
    hdma2d.Init.OutputOffset = 0;
    HAL_DMA2D_Init(&hdma2d);
    HAL_DMA2D_ConfigLayer(&hdma2d, 0);
    
    // 清空屏幕
    HAL_DMA2D_Start(&hdma2d, (uint32_t)&hltdc.LayerCfg[0].FBStartAdress, DMA2D_R2M, 0x00000000, LCD_WIDTH, LCD_HEIGHT);
    HAL_DMA2D_PollForTransfer(&hdma2d, 100);
}

这段代码实现了对LTDC的初始化，使能和清空屏幕，其中`LCD_WIDTH`和`LCD_HEIGHT`分别为LCD屏幕的宽度和高度。你可以在代码中添加自己的LCD驱动程序，并根据需要修改初始化参数。