Initialization and Configuration functions

Initialization and Configuration functions. More...

Functions
HAL_StatusTypeDef	HAL_LTDCEx_StructInitFromVideoConfig (LTDC_HandleTypeDef *hltdc, DSI_VidCfgTypeDef *VidCfg)
	Retrieve common parameters from DSI Video mode configuration structure. More...
HAL_StatusTypeDef	HAL_LTDCEx_StructInitFromAdaptedCommandConfig (LTDC_HandleTypeDef *hltdc, DSI_CmdCfgTypeDef *CmdCfg)
	Retrieve common parameters from DSI Adapted command mode configuration structure. More...

Detailed Description

Initialization and Configuration functions.

 ===============================================================================
                ##### Initialization and Configuration functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Initialize and configure the LTDC

Function Documentation

HAL_LTDCEx_StructInitFromAdaptedCommandConfig()

HAL_StatusTypeDef HAL_LTDCEx_StructInitFromAdaptedCommandConfig	(	LTDC_HandleTypeDef *	hltdc,
		DSI_CmdCfgTypeDef *	CmdCfg
	)

Retrieve common parameters from DSI Adapted command mode configuration structure.

Parameters

hltdc	pointer to a LTDC_HandleTypeDef structure that contains the configuration information for the LTDC.
CmdCfg	pointer to a DSI_CmdCfgTypeDef structure that contains the DSI command mode configuration parameters

Note

The implementation of this function is taking into account the LTDC polarities inversion as described in the current LTDC specification

Return values

HAL

status

Definition at line 107 of file stm32l4xx_hal_ltdc_ex.c.

{
  /* 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;
}

HAL_LTDCEx_StructInitFromVideoConfig()

HAL_StatusTypeDef HAL_LTDCEx_StructInitFromVideoConfig	(	LTDC_HandleTypeDef *	hltdc,
		DSI_VidCfgTypeDef *	VidCfg
	)

Retrieve common parameters from DSI Video mode configuration structure.

Parameters

hltdc	pointer to a LTDC_HandleTypeDef structure that contains the configuration information for the LTDC.
VidCfg	pointer to a DSI_VidCfgTypeDef structure that contains the DSI video mode configuration parameters

Note

The implementation of this function is taking into account the LTDC polarities inversion as described in the current LTDC specification

Return values

HAL

status

Definition at line 71 of file stm32l4xx_hal_ltdc_ex.c.

{
  /* 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;
}