Getting wring color when testing LTDC !!

Question

Hello,I am testing the LTDC on a dev board. The strange thing is i am getting the wrong color at initialization. Below is the code for initialzation of LTDC. I get red when i try to fill with blue, and red when i try to fill with blue. Thesre is half word swap heppening somwhere but i cant notice it.Please advise.=================================================================

MMoha.4 · Answer

Below is the initialization code :static uint16_t frame_buffer[320 * 240];LTDC_HandleTypeDef hltdc;static uint16_t *ptr_ltdc_draw_buffer;static void ltdc_low_level_init(void);void ltdc_init(void){ /* Low level initialization */ ltdc_low_level_init(); /* Fill screen with Blue */ for (int i = 0; i < (320 * 240); i++) {  frame_buffer[i] = 0x001F; } /* */ 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_IIPC; hltdc.Init.HorizontalSync   = 3; hltdc.Init.VerticalSync    = 3; hltdc.Init.AccumulatedHBP   = 46; hltdc.Init.AccumulatedVBP   = 15; hltdc.Init.AccumulatedActiveW = 366; hltdc.Init.AccumulatedActiveH = 255; hltdc.Init.TotalWidth     = 374; hltdc.Init.TotalHeigh     = 257; hltdc.Init.Backcolor.Blue   = 255; hltdc.Init.Backcolor.Green  = 0; hltdc.Init.Backcolor.Red   = 0; /* */ if (HAL_LTDC_Init(&hltdc) != HAL_OK) {  Error_Handler(); } LTDC_LayerCfgTypeDef pLayerCfg = {0}; /* */ pLayerCfg.WindowX0      = 0; pLayerCfg.WindowX1      = 320; pLayerCfg.WindowY0      = 0; pLayerCfg.WindowY1      = 240; pLayerCfg.PixelFormat     = LTDC_PIXEL_FORMAT_RGB565; pLayerCfg.Alpha        = 255; pLayerCfg.Alpha0       = 225; pLayerCfg.BlendingFactor1   = LTDC_BLENDING_FACTOR1_CA; pLayerCfg.BlendingFactor2   = LTDC_BLENDING_FACTOR2_CA; pLayerCfg.FBStartAdress    = (uint32_t) ptr_ltdc_draw_buffer; pLayerCfg.ImageWidth     = 320; pLayerCfg.ImageHeight     = 240; pLayerCfg.Backcolor.Blue   = 255; pLayerCfg.Backcolor.Green   = 0; pLayerCfg.Backcolor.Red    = 0; /* */ if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK) {  Error_Handler(); }}/** * @brief Private function template. * @note  Note 1. * @param pram1 description of param1. * @param pram2 description of param1. * @retval Return description */static void ltdc_low_level_init(void){ GPIO_InitTypeDef GPIO_InitStruct = {0}; RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0}; /*  * Initializes the peripherals clock  */ PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC; PeriphClkInitStruct.PLL3.PLL3M = 6; PeriphClkInitStruct.PLL3.PLL3N = 129; PeriphClkInitStruct.PLL3.PLL3P = 2; PeriphClkInitStruct.PLL3.PLL3Q = 2; PeriphClkInitStruct.PLL3.PLL3R = 53; PeriphClkInitStruct.PLL3.PLL3RGE = RCC_PLL3VCIRANGE_1; PeriphClkInitStruct.PLL3.PLL3VCOSEL = RCC_PLL3VCOWIDE; PeriphClkInitStruct.PLL3.PLL3FRACN = 0; if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {  Error_Handler(); } /* LTDC clock enable */ __HAL_RCC_LTDC_CLK_ENABLE(); /* GPIO clock enable */ __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOE_CLK_ENABLE(); __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); /* LTDC GPIO Configuration : PA1   ------> LTDC_R2 PB0   ------> LTDC_R3 PA11  ------> LTDC_R4 PA9   ------> LTDC_R5 PB1   ------> LTDC_R6 PE15  ------> LTDC_R7 PD6   ------> LTDC_B2 PA8   ------> LTDC_B3 PE12  ------> LTDC_B4 PA3   ------> LTDC_B5 PB8   ------> LTDC_B6 PB9   ------> LTDC_B7 PA6   ------> LTDC_G2 PE11  ------> LTDC_G3 PB10  ------> LTDC_G4 PB11  ------> LTDC_G5 PC7   ------> LTDC_G6 PD3   ------> LTDC_G7 PA4   ------> LTDC_VSYNC PE13   ------> LTDC_DE PE14   ------> LTDC_CLK PC6   ------> LTDC_HSYNC */ GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_6            |GPIO_PIN_9|USB_DFU_DM___LTDC_R4_Pin; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; 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_LOW; GPIO_InitStruct.Alternate = GPIO_AF9_LTDC; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14            |GPIO_PIN_15; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; 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_LOW; GPIO_InitStruct.Alternate = GPIO_AF14_LTDC; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; GPIO_InitStruct.Alternate = GPIO_AF14_LTDC; HAL_GPIO_Init(GPIOC, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_8; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; GPIO_InitStruct.Alternate = GPIO_AF13_LTDC; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_6; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; GPIO_InitStruct.Alternate = GPIO_AF14_LTDC; HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);}

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