STM32F429 LCD Flickering

Kwon YM · ‎2018-02-27

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

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);

}

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__);

}

Imen.D · ‎2018-02-27

Posted on February 27, 2018 at 16:22

Hello,

To check if the problem here seems related to the hardware environment, you can exclude the two layers and display ONLY a BLUE background with Layers disabled.

What about your FMC configuration? FMC Bank1 is disabled or not ?

The FMC bank1 should be disabled if not used, the MPU should be set for the SDRAM as wellâ€¦

Please have a look to the

http://www.st.com/content/ccc/resource/technical/document/application_note/group0/25/ca/f9/b4/ae/fc/4e/1e/DM00287603/files/DM00287603.pdf/jcr:content/translations/en.DM00287603.pdf

application note with detailed examples

explaining many important aspects such as display resolution compatibility and performances aspect. Also,

it may help you on how to configure the MPU in order to prevent graphical performance issues.

Moreover, enabled the FIFO underrun interrupt is useful for determining the display size compatibility, this help you to detect display issue.

Please keep me informed about the progress on this.

Best Regards,

Imen.

When your question is answered, please close this topic by clicking "Accept as Solution".
Thanks
Imen

Vitaliy Chernobay · ‎2018-02-27

Posted on February 27, 2018 at 23:04

I had a similar problem

https://arm-stm.blogspot.com/2017/04/stm32f746ng-discovery-ram-stemwin.html