STM32F429 LCD Flickering

Posted on February 27, 2018 at 13:16

I use STM32F429 witch display on 7inch LCD

This board's status was normal after display rectangle.

but something has problem during display rectangle with some flickering.

It has problem that use DMA2D or direct rambuffer too.

LCD model is 'at070tn94' 800*480

<Movie clip>

https://drive.google.com/file/d/1PE1mMioyWdtiboBF-62eS3ZK5IaWKJWg/view?usp=sharing

 

<Main>

HAL_Init();

/* USER CODE BEGIN Init */

/* USER CODE END Init */

/* Configure the system clock */

SystemClock_Config();

/* USER CODE BEGIN SysInit */

/* USER CODE END SysInit */

/* Initialize all configured peripherals */

MX_GPIO_Init();

MX_FMC_Init();

MX_LTDC_Init();

MX_RTC_Init();

MX_USB_OTG_FS_USB_Init();

MX_SPI2_Init();

MX_DMA2D_Init();

MX_I2C2_Init();

MX_TIM3_Init();

MX_CRC_Init();

/* USER CODE BEGIN 2 */

// Program the SDRAM external device

SDRAM_Initialization_Sequence(&hsdram2, &command);

HAL_Delay(200);

//LCD GPIO

HAL_GPIO_WritePin(GPIOD, GPIO_PIN_13, GPIO_PIN_SET); //BACK LIGHT

HAL_GPIO_WritePin(GPIOC, GPIO_PIN_6, GPIO_PIN_SET); //L_MODE

TP_CS_H;

for(testdma=0; testdma < 100; testdma++) {

HAL_Delay(500);

DMA2DFillBuffer(glCurrentLayer, glCurrentFrameBuffer, rand()%800, rand()%480, rand()%100, rand()%100, rand()%0xFFFFFF, DMA2D_RGB565);

}

<LCD setting>

LTDC_LayerCfgTypeDef pLayerCfg;

LTDC_LayerCfgTypeDef pLayerCfg1;

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 = 9;

hltdc.Init.VerticalSync = 1;

hltdc.Init.AccumulatedHBP = 45;

hltdc.Init.AccumulatedVBP = 22;

hltdc.Init.AccumulatedActiveW = 845;

hltdc.Init.AccumulatedActiveH = 502;

hltdc.Init.TotalWidth = 895;

hltdc.Init.TotalHeigh = 525;

hltdc.Init.Backcolor.Blue = 0;

hltdc.Init.Backcolor.Green = 0;

hltdc.Init.Backcolor.Red = 0;

if (HAL_LTDC_Init(&hltdc) != HAL_OK)

{

_Error_Handler(__FILE__, __LINE__);

}

pLayerCfg.WindowX0 = 0;

pLayerCfg.WindowX1 = 800;

pLayerCfg.WindowY0 = 0;

pLayerCfg.WindowY1 = 480;

pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;

pLayerCfg.Alpha = 255;

pLayerCfg.Alpha0 = 0;

pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;

pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;

pLayerCfg.FBStartAdress = 0xD0000000;

pLayerCfg.ImageWidth = 800;

pLayerCfg.ImageHeight = 480;

pLayerCfg.Backcolor.Blue = 0;

pLayerCfg.Backcolor.Green = 0;

pLayerCfg.Backcolor.Red = 0;

if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)

{

_Error_Handler(__FILE__, __LINE__);

}

pLayerCfg1.WindowX0 = 0;

pLayerCfg1.WindowX1 = 800;

pLayerCfg1.WindowY0 = 0;

pLayerCfg1.WindowY1 = 480;

pLayerCfg1.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;

pLayerCfg1.Alpha = 0;

pLayerCfg1.Alpha0 = 0;

pLayerCfg1.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;

pLayerCfg1.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;

pLayerCfg1.FBStartAdress = 0xD0000000 + 0xbb800;

pLayerCfg1.ImageWidth = 800;

pLayerCfg1.ImageHeight = 480;

pLayerCfg1.Backcolor.Blue = 0;

pLayerCfg1.Backcolor.Green = 0;

pLayerCfg1.Backcolor.Red = 0;

if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg1, 1) != HAL_OK)

{

_Error_Handler(__FILE__, __LINE__);

}