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BDong
BDong
Visitor II
March 4, 2019
Question

STM32F429 LTDC Screen doesn't work. Cannot draw shapes and it's getting noisy.

  • March 4, 2019
  • 1 reply
  • 1033 views

I am trying to make the LTDC controller work on my STM32F429 Discovery Board. Right now, after I run the code, I can tell the screen settings take their effects (SPI commands), but I cannot draw on the screen. The screen is getting noisy gradually.

Here are my settings:

  1. Layer 1 color format is L8. And I configured / enabled the CLUT.
  2. I didn't create my framebuffer on SDRAM, but save it directly in controller RAM.
  3. Not using DMA.

Here is some of my code:

  • You can find all of them on my Github:

https://github.com/boningdong/STM32-ILI9341-DEMO/tree/RGB

  • LTDC Config
static void MX_LTDC_Init(void)
{
 
 LTDC_LayerCfgTypeDef pLayerCfg = {0};
 
 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 = 29;
 hltdc.Init.AccumulatedVBP = 3;
 hltdc.Init.AccumulatedActiveW = 269;
 hltdc.Init.AccumulatedActiveH = 323;
 hltdc.Init.TotalWidth = 279;
 hltdc.Init.TotalHeigh = 327;
 hltdc.Init.Backcolor.Blue = 5;
 hltdc.Init.Backcolor.Green = 50;
 hltdc.Init.Backcolor.Red = 10;
 if (HAL_LTDC_Init(&hltdc) != HAL_OK)
 {
 Error_Handler();
 }
 pLayerCfg.WindowX0 = 0;
 pLayerCfg.WindowX1 = 240;
 pLayerCfg.WindowY0 = 0;
 pLayerCfg.WindowY1 = 320;
 pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_L8;
 pLayerCfg.Alpha = 0x10;
 pLayerCfg.Alpha0 = 0x10;
 pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
 pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR1_PAxCA;
 pLayerCfg.FBStartAdress = 0;
 pLayerCfg.ImageWidth = 240;
 pLayerCfg.ImageHeight = 320;
 pLayerCfg.Backcolor.Blue = 100;
 pLayerCfg.Backcolor.Green = 50;
 pLayerCfg.Backcolor.Red = 100;
 if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN LTDC_Init 2 */
 
 /* USER CODE END LTDC_Init 2 */
 
}
 
void HAL_LTDC_MspInit(LTDC_HandleTypeDef* hltdc)
{
 
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 if(hltdc->Instance==LTDC)
 {
 /* USER CODE BEGIN LTDC_MspInit 0 */
 
 /* USER CODE END LTDC_MspInit 0 */
 /* Peripheral clock enable */
 __HAL_RCC_LTDC_CLK_ENABLE();
 
 __HAL_RCC_GPIOF_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();
 __HAL_RCC_GPIOE_CLK_ENABLE();
 __HAL_RCC_GPIOD_CLK_ENABLE();
 __HAL_RCC_GPIOC_CLK_ENABLE();
 /**LTDC GPIO Configuration 
 PF10 ------> LTDC_DE
 PA3 ------> LTDC_B5
 PA4 ------> LTDC_VSYNC
 PA6 ------> LTDC_G2
 PB0 ------> LTDC_R3
 PB1 ------> LTDC_R6
 PE11 ------> LTDC_G3
 PE12 ------> LTDC_B4
 PE14 ------> LTDC_CLK
 PE15 ------> LTDC_R7
 PB10 ------> LTDC_G4
 PB11 ------> LTDC_G5
 PD10 ------> LTDC_B3
 PC6 ------> LTDC_HSYNC
 PC7 ------> LTDC_G6
 PA11 ------> LTDC_R4
 PA12 ------> LTDC_R5
 PC10 ------> LTDC_R2
 PD3 ------> LTDC_G7
 PD6 ------> LTDC_B2
 PB8 ------> LTDC_B6
 PB9 ------> LTDC_B7 
 */
 GPIO_InitStruct.Pin = GPIO_PIN_10;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
 HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
 
 GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_6|GPIO_PIN_11 
 |GPIO_PIN_12;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
 GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF9_LTDC;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
 GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_14|GPIO_PIN_15;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
 HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
 GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_8|GPIO_PIN_9;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
 GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_3|GPIO_PIN_6;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
 HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
 
 GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_10;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
 /* LTDC interrupt Init */
 HAL_NVIC_SetPriority(LTDC_IRQn, 0, 0);
 //HAL_NVIC_EnableIRQ(LTDC_IRQn);
 HAL_NVIC_SetPriority(LTDC_ER_IRQn, 0, 0);
 //HAL_NVIC_EnableIRQ(LTDC_ER_IRQn);
 /* USER CODE BEGIN LTDC_MspInit 1 */
 
 /* USER CODE END LTDC_MspInit 1 */
 }
 
}
  •  
  • LCD Initialization
void LCD_LtdcInit() {
	// Call LTDC_Init and GPIO_Init before calling this function
	__HAL_RCC_GPIOC_CLK_ENABLE();
	__HAL_RCC_GPIOD_CLK_ENABLE();
 
	/*
	GPIO_InitTypeDef gpioInit;
	gpioInit.Mode = GPIO_MODE_OUTPUT_PP;
	gpioInit.Pull = GPIO_PULLUP;
	gpioInit.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 
	gpioInit.Pin = LCD_PIN_WRX;
	HAL_GPIO_Init(LCD_WRX_PORT, &gpioInit);
 
	gpioInit.Pin = LCD_PIN_RDX;
	HAL_GPIO_Init(LCD_RDX_PORT, &gpioInit);
 
	gpioInit.Pin = LCD_PIN_TE;
	HAL_GPIO_Init(LCD_TE_PORT, &gpioInit);
 
	gpioInit.Pin = LCD_PIN_DCX;
	HAL_GPIO_Init(LCD_DCX_PORT, &gpioInit);*/
 
	// Screen Parameters Set
	HAL_LTDC_SetPixelFormat_NoReload(&hltdc, LTDC_PIXEL_FORMAT_L8 , LTDC_LAYER_1);
	HAL_LTDC_SetAddress_NoReload(&hltdc, (uint32_t)VRAM, LTDC_LAYER_1);
	HAL_LTDC_ConfigCLUT(&hltdc, LCD_CLUT, 256, LTDC_LAYER_1);
	HAL_LTDC_EnableCLUT_NoReload(&hltdc, LTDC_LAYER_1);
	HAL_LTDC_Reload(&hltdc, LTDC_RELOAD_VERTICAL_BLANKING);
 
 
}
 
void LCD_ModuleInit() {
 
 
	//SOFTWARE RESET
	LCD_WriteCommand(0x01);
	HAL_Delay(1000);
 
	//POWER CONTROL A
	LCD_WriteCommand(0xCB);
	LCD_WriteData(0x39);
	LCD_WriteData(0x2C);
	LCD_WriteData(0x00);
	LCD_WriteData(0x34);
	LCD_WriteData(0x02);
 
	//POWER CONTROL B
	LCD_WriteCommand(0xCF);
	LCD_WriteData(0x00);
	LCD_WriteData(0xC1);
	LCD_WriteData(0x30);
 
 
	//DRIVER TIMING CONTROL A
	LCD_WriteCommand(0xE8);
	LCD_WriteData(0x85);
	LCD_WriteData(0x00);
	LCD_WriteData(0x78);
 
	//DRIVER TIMING CONTROL B
	LCD_WriteCommand(0xEA);
	LCD_WriteData(0x00);
	LCD_WriteData(0x00);
 
	//POWER ON SEQUENCE CONTROL
	LCD_WriteCommand(0xED);
	LCD_WriteData(0x64);
	LCD_WriteData(0x03);
	LCD_WriteData(0x12);
	LCD_WriteData(0x81);
 
	//PUMP RATIO CONTROL
	LCD_WriteCommand(0xF7);
	LCD_WriteData(0x20);
 
	//POWER CONTROL,VRH[5:0]
	LCD_WriteCommand(0xC0);
	LCD_WriteData(0x23);
 
	//POWER CONTROL,SAP[2:0];BT[3:0]
	LCD_WriteCommand(0xC1);
	LCD_WriteData(0x10);
 
	//VCM CONTROL
	LCD_WriteCommand(0xC5);
	LCD_WriteData(0x3E);
	LCD_WriteData(0x28);
 
	//VCM CONTROL 2
	LCD_WriteCommand(0xC7);
	LCD_WriteData(0x86);
 
 
	//MEMORY ACCESS CONTROL
	LCD_WriteCommand(0x36);
	LCD_WriteData(0x48);
 
 
	//FRAME RATIO CONTROL, STANDARD RGB COLOR
	LCD_WriteCommand(0xB1);
	LCD_WriteData(0x00);
	LCD_WriteData(0x18);
 
	//DISPLAY FUNCTION CONTROL
	LCD_WriteCommand(0xB6);
	//LCD_WriteData(0x08);
	//LCD_WriteData(0x82);
	//LCD_WriteData(0x27);
	LCD_WriteData(0x0A);
	LCD_WriteData(0xA7);
	LCD_WriteData(0x27);
	LCD_WriteData(0x04);
 
 
	//3GAMMA FUNCTION DISABLE
	LCD_WriteCommand(0xF2);
	LCD_WriteData(0x00);
 
	//GAMMA CURVE SELECTED
	LCD_WriteCommand(0x26);
	LCD_WriteData(0x01);
 
	//POSITIVE GAMMA CORRECTION
	LCD_WriteCommand(0xE0);
	LCD_WriteData(0x0F);
	LCD_WriteData(0x31);
	LCD_WriteData(0x2B);
	LCD_WriteData(0x0C);
	LCD_WriteData(0x0E);
	LCD_WriteData(0x08);
	LCD_WriteData(0x4E);
	LCD_WriteData(0xF1);
	LCD_WriteData(0x37);
	LCD_WriteData(0x07);
	LCD_WriteData(0x10);
	LCD_WriteData(0x03);
	LCD_WriteData(0x0E);
	LCD_WriteData(0x09);
	LCD_WriteData(0x00);
 
	//NEGATIVE GAMMA CORRECTION
	LCD_WriteCommand(0xE1);
	LCD_WriteData(0x00);
	LCD_WriteData(0x0E);
	LCD_WriteData(0x14);
	LCD_WriteData(0x03);
	LCD_WriteData(0x11);
	LCD_WriteData(0x07);
	LCD_WriteData(0x31);
	LCD_WriteData(0xC1);
	LCD_WriteData(0x48);
	LCD_WriteData(0x08);
	LCD_WriteData(0x0F);
	LCD_WriteData(0x0C);
	LCD_WriteData(0x31);
	LCD_WriteData(0x36);
	LCD_WriteData(0x0F);
 
	LCD_WriteCommand(0x2c);
	HAL_Delay(200);
 
	//INTERFACE CONTROL
	LCD_WriteCommand(0xF6);
	LCD_WriteData(0x01);
	LCD_WriteData(0x00);
	LCD_WriteData(0x06);
	//LCD_WriteData(0x08);
 
	//RGB INTERFACE
	LCD_WriteCommand(0xB0);
	LCD_WriteData(0xC2);
 
	//PIXEL FORMAT
	LCD_WriteCommand(0x3A);
	LCD_WriteData(0x55);
 
	//EXIT SLEEP
	LCD_WriteCommand(0x11);
	HAL_Delay(120);
 
	//TURN ON DISPLAY
	LCD_WriteCommand(0x29);
 
	LCD_WriteCommand(0x2c);
	HAL_Delay(200);
}

This topic has been closed for replies.

1 reply

Mon2
Mon2
Senior III
March 5, 2019

https://s3.amazonaws.com/axxonshare/my_combo_tutorial.zip

Welcome feedback on this document and if it works for you. Good luck! :grinning_face:

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