stm32l4xx_hal_ltdc_ex.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal.h"

#if defined(HAL_LTDC_MODULE_ENABLED) && defined(HAL_DSI_MODULE_ENABLED)

#if defined (LTDC) && defined (DSI)

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/

HAL_StatusTypeDef HAL_LTDCEx_StructInitFromVideoConfig(LTDC_HandleTypeDef *hltdc, DSI_VidCfgTypeDef *VidCfg)
{
  /* Retrieve signal polarities from DSI */

  /* The following polarity is inverted:
                     LTDC_DEPOLARITY_AL <-> LTDC_DEPOLARITY_AH */

  /* Note 1 : Code in line w/ Current LTDC specification */
  hltdc->Init.DEPolarity = (VidCfg->DEPolarity == DSI_DATA_ENABLE_ACTIVE_HIGH) ? LTDC_DEPOLARITY_AL : LTDC_DEPOLARITY_AH;
  hltdc->Init.VSPolarity = (VidCfg->VSPolarity == DSI_VSYNC_ACTIVE_HIGH) ? LTDC_VSPOLARITY_AH : LTDC_VSPOLARITY_AL;
  hltdc->Init.HSPolarity = (VidCfg->HSPolarity == DSI_HSYNC_ACTIVE_HIGH) ? LTDC_HSPOLARITY_AH : LTDC_HSPOLARITY_AL;

  /* Note 2: Code to be used in case LTDC polarities inversion updated in the specification */
  /* hltdc->Init.DEPolarity = VidCfg->DEPolarity << 29;
     hltdc->Init.VSPolarity = VidCfg->VSPolarity << 29;
     hltdc->Init.HSPolarity = VidCfg->HSPolarity << 29; */

  /* Retrieve vertical timing parameters from DSI */
  hltdc->Init.VerticalSync       = VidCfg->VerticalSyncActive - 1U;
  hltdc->Init.AccumulatedVBP     = VidCfg->VerticalSyncActive + VidCfg->VerticalBackPorch - 1U;
  hltdc->Init.AccumulatedActiveH = VidCfg->VerticalSyncActive + VidCfg->VerticalBackPorch + VidCfg->VerticalActive - 1U;
  hltdc->Init.TotalHeigh         = VidCfg->VerticalSyncActive + VidCfg->VerticalBackPorch + VidCfg->VerticalActive + VidCfg->VerticalFrontPorch - 1U;

  return HAL_OK;
}

HAL_StatusTypeDef HAL_LTDCEx_StructInitFromAdaptedCommandConfig(LTDC_HandleTypeDef *hltdc, DSI_CmdCfgTypeDef *CmdCfg)
{
  /* Retrieve signal polarities from DSI */

  /* The following polarities are inverted:
                     LTDC_DEPOLARITY_AL <-> LTDC_DEPOLARITY_AH
                     LTDC_VSPOLARITY_AL <-> LTDC_VSPOLARITY_AH
                     LTDC_HSPOLARITY_AL <-> LTDC_HSPOLARITY_AH)*/

  /* Note 1 : Code in line w/ Current LTDC specification */
  hltdc->Init.DEPolarity = (CmdCfg->DEPolarity == DSI_DATA_ENABLE_ACTIVE_HIGH) ? LTDC_DEPOLARITY_AL : LTDC_DEPOLARITY_AH;
  hltdc->Init.VSPolarity = (CmdCfg->VSPolarity == DSI_VSYNC_ACTIVE_HIGH) ? LTDC_VSPOLARITY_AL : LTDC_VSPOLARITY_AH;
  hltdc->Init.HSPolarity = (CmdCfg->HSPolarity == DSI_HSYNC_ACTIVE_HIGH) ? LTDC_HSPOLARITY_AL : LTDC_HSPOLARITY_AH;

  /* Note 2: Code to be used in case LTDC polarities inversion updated in the specification */
  /* hltdc->Init.DEPolarity = CmdCfg->DEPolarity << 29;
     hltdc->Init.VSPolarity = CmdCfg->VSPolarity << 29;
     hltdc->Init.HSPolarity = CmdCfg->HSPolarity << 29; */

  return HAL_OK;
}

#endif /* LTDC && DSI */

#endif /* HAL_LTCD_MODULE_ENABLED && HAL_DSI_MODULE_ENABLED */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/