STM32F429驱动7寸屏-第2页回答

1楼-- · 2019-07-21 16:23

void LCD_Init(void)
{
  LTDC_InitTypeDef       LTDC_InitStruct;
  LTDC_Layer_InitTypeDef LTDC_Layer_InitStruct;
  LTDC_Layer_TypeDef     LTDC_Layerx;


  /* IO口初始化 */
  LCD_GPIOInit();

  LCD_DisplayOff();
  /* 使能LCD时钟 */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_LTDC, ENABLE);
  /* 使能DMA失踪*/
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2D, ENABLE);

  /* 水平同步信号---低电平有效 */
  LTDC_InitStruct.LTDC_HSPolarity = LTDC_HSPolarity_AL;
  /* 垂直同步信号---低电平有效 */
  LTDC_InitStruct.LTDC_VSPolarity = LTDC_VSPolarity_AL;
  /* 数据使能信号---低电平有效 */
  LTDC_InitStruct.LTDC_DEPolarity = LTDC_DEPolarity_AL;
  /* 像素时钟配置--- */
  //LTDC_InitStruct.LTDC_PCPolarity = LTDC_DEPolarity_AL;
LTDC_InitStruct.LTDC_PCPolarity = LTDC_PCPolarity_IPC;

/* LCD背光设置 */
  LTDC_InitStruct.LTDC_BackgroundRedValue = 0;
  LTDC_InitStruct.LTDC_BackgroundGreenValue = 0;
  LTDC_InitStruct.LTDC_BackgroundBlueValue = 0;
  /*
   ****************************************************************************
   *PLLSAI_VCO = HSE*PLLSAI_N /

LL_M = 8 * 192 / 8 = 192MHz
*PLLLCDCLK =

LLSAI_VCO /

LLSAI_R = 192 / 3 = 64 Mhz
*LTDC clock frequency =

LLLCDCLK / RCC_PLLSAIDivR = 64 / 2 = 32 Mhz
   ****************************************************************************
   */
  RCC_PLLSAIConfig(192, 7, 3);
  RCC_LTDCCLKDivConfig(RCC_PLLSAIDivR_Div4);
  /* 使能PLLSAI时钟 */
  RCC_PLLSAICmd(ENABLE);
  /* 等待PLLSAI时钟 */
  while(RCC_GetFlagStatus(RCC_FLAG_PLLSAIRDY) == RESET){}

  /* Configure horizontal synchronization width */
  LTDC_InitStruct.LTDC_HorizontalSync = 39;
  /* Configure vertical synchronization height */
  LTDC_InitStruct.LTDC_VerticalSync = 19;
  /* Configure accumulated horizontal back porch */
  LTDC_InitStruct.LTDC_AccumulatedHBP = 45;
  /* Configure accumulated vertical back porch */
  LTDC_InitStruct.LTDC_AccumulatedVBP = 22;
  /* Configure accumulated active width */
  LTDC_InitStruct.LTDC_AccumulatedActiveW = 845;
  /* Configure accumulated active height */
  LTDC_InitStruct.LTDC_AccumulatedActiveH = 502;
  /* Configure total width */
  LTDC_InitStruct.LTDC_TotalWidth = 1055;
  /* Configure total height */
  LTDC_InitStruct.LTDC_TotalHeigh = 524;

  LTDC_Init(<DC_InitStruct);

  LTDC_ITConfig(LTDC_IER_LIE,ENABLE);
NVIC_SetPriority(LTDC_IRQn,0);
  NVIC_EnableIRQ(LTDC_IRQn);

   DMA2D_ITConfig(DMA2D_CR_TCIE,ENABLE);
   NVIC_SetPriority(DMA2D_IRQn,0);
   NVIC_EnableIRQ(DMA2D_IRQn);
   DMA2D->IFCR=(u32)DMA2D_IFSR_CTCIF;




LTDC_Layer_InitStruct.LTDC_HorizontalStart = 46;  //46
// LTDC_Layer_InitStruct.LTDC_HorizontalStart = 70;
// LTDC_Layer_InitStruct.LTDC_HorizontalStop = (480 + 43 - 1);
  LTDC_Layer_InitStruct.LTDC_HorizontalStop = (800 + 46 - 1);

  LTDC_Layer_InitStruct.LTDC_VarticalStart = 23;//23
// LTDC_Layer_InitStruct.LTDC_VerticalStop = (272 + 12 - 1);
  LTDC_Layer_InitStruct.LTDC_VerticalStop = (480 + 23 - 1);
  /*

ixel Format configuration*/
  LTDC_Layer_InitStruct.LTDC_PixelFormat = LTDC_Pixelformat_RGB565;
  /* Alpha constant (255 totally opaque) */
  LTDC_Layer_InitStruct.LTDC_ConstantAlpha = 255;
  /* Default Color configuration (configure A,R,G,B component values) */
  LTDC_Layer_InitStruct.LTDC_DefaultColorBlue = 0;
  LTDC_Layer_InitStruct.LTDC_DefaultColorGreen = 0;
  LTDC_Layer_InitStruct.LTDC_DefaultColorRed = 0;
  LTDC_Layer_InitStruct.LTDC_DefaultColorAlpha = 0;
  /* Configure blending factors */
  LTDC_Layer_InitStruct.LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_CA;
  LTDC_Layer_InitStruct.LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_CA;
  /* the length of one line of pixels in bytes + 3 then:
     Line Lenth = Active high width x number of bytes per pixel + 3
     Active high width         = LCD_PIXEL_WIDTH
     number of bytes per pixel = 2    (pixel_format: RGB565)
  */
// LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((480 * 2) + 3);
LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((800 * 2) + 3);
  /*  the pitch is the increment from the start of one line of pixels to the
      start of the next line in bytes, then:

itch = Active high width x number of bytes per pixel
  */
// LTDC_Layer_InitStruct.LTDC_CFBPitch = (480 * 2);
LTDC_Layer_InitStruct.LTDC_CFBPitch = (800 * 2);
  /* configure the number of lines */
// LTDC_Layer_InitStruct.LTDC_CFBLineNumber = 272;
LTDC_Layer_InitStruct.LTDC_CFBLineNumber = 480;
  /* Input Address configuration */
  LTDC_Layer_InitStruct.LTDC_CFBStartAdress = LCD_FRAME_BUFFER;

  LTDC_LayerInit(LTDC_Layer1, <DC_Layer_InitStruct);

  /* Configure Layer2 */
//  LTDC_Layer_InitStruct.LTDC_CFBStartAdress = LCD_FRAME_BUFFER + BUFFER_OFFSET;
// LTDC_Layer_InitStruct.LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_PAxCA;
// LTDC_Layer_InitStruct.LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_PAxCA;
// LTDC_LayerInit(LTDC_Layer2, <DC_Layer_InitStruct);

// LTDC_ReloadConfig(LTDC_IMReload);

  /* Enable foreground & background Layers */
  LTDC_LayerCmd(LTDC_Layer1, ENABLE);
//LTDC_LayerCmd(LTDC_Layer2, ENABLE);
  LTDC_ReloadConfig(LTDC_IMReload);

//  LCD_DisplayOn();
}