LTDC Private Functions

Functions
static void	LTDC_SetConfig (LTDC_HandleTypeDef *hltdc, LTDC_LayerCfgTypeDef *pLayerCfg, uint32_t LayerIdx)
	Configure the LTDC peripheral. More...

Detailed Description

Function Documentation

LTDC_SetConfig()

static void LTDC_SetConfig ( LTDC_HandleTypeDef *  hltdc, LTDC_LayerCfgTypeDef *  pLayerCfg, uint32_t  LayerIdx  )

static

Configure the LTDC peripheral.

Parameters

hltdc	Pointer to a LTDC_HandleTypeDef structure that contains the configuration information for the LTDC.
pLayerCfg	Pointer LTDC Layer Configuration structure
LayerIdx	LTDC Layer index. This parameter can be one of the following values: LTDC_LAYER_1 (0) or LTDC_LAYER_2 (1)

Return values

None

Definition at line 2076 of file stm32l4xx_hal_ltdc.c.

{
  uint32_t tmp;
  uint32_t tmp1;
  uint32_t tmp2;

  /* Configure the horizontal start and stop position */
  tmp = ((pLayerCfg->WindowX1 + ((hltdc->Instance->BPCR & LTDC_BPCR_AHBP) >> 16U)) << 16U);
  LTDC_LAYER(hltdc, LayerIdx)->WHPCR &= ~(LTDC_LxWHPCR_WHSTPOS | LTDC_LxWHPCR_WHSPPOS);
  LTDC_LAYER(hltdc, LayerIdx)->WHPCR = ((pLayerCfg->WindowX0 + ((hltdc->Instance->BPCR & LTDC_BPCR_AHBP) >> 16U) + 1U) | tmp);

  /* Configure the vertical start and stop position */
  tmp = ((pLayerCfg->WindowY1 + (hltdc->Instance->BPCR & LTDC_BPCR_AVBP)) << 16U);
  LTDC_LAYER(hltdc, LayerIdx)->WVPCR &= ~(LTDC_LxWVPCR_WVSTPOS | LTDC_LxWVPCR_WVSPPOS);
  LTDC_LAYER(hltdc, LayerIdx)->WVPCR  = ((pLayerCfg->WindowY0 + (hltdc->Instance->BPCR & LTDC_BPCR_AVBP) + 1U) | tmp);

  /* Specifies the pixel format */
  LTDC_LAYER(hltdc, LayerIdx)->PFCR &= ~(LTDC_LxPFCR_PF);
  LTDC_LAYER(hltdc, LayerIdx)->PFCR = (pLayerCfg->PixelFormat);

  /* Configure the default color values */
  tmp = ((uint32_t)(pLayerCfg->Backcolor.Green) << 8U);
  tmp1 = ((uint32_t)(pLayerCfg->Backcolor.Red) << 16U);
  tmp2 = (pLayerCfg->Alpha0 << 24U);
  LTDC_LAYER(hltdc, LayerIdx)->DCCR &= ~(LTDC_LxDCCR_DCBLUE | LTDC_LxDCCR_DCGREEN | LTDC_LxDCCR_DCRED | LTDC_LxDCCR_DCALPHA);
  LTDC_LAYER(hltdc, LayerIdx)->DCCR = (pLayerCfg->Backcolor.Blue | tmp | tmp1 | tmp2);

  /* Specifies the constant alpha value */
  LTDC_LAYER(hltdc, LayerIdx)->CACR &= ~(LTDC_LxCACR_CONSTA);
  LTDC_LAYER(hltdc, LayerIdx)->CACR = (pLayerCfg->Alpha);

  /* Specifies the blending factors */
  LTDC_LAYER(hltdc, LayerIdx)->BFCR &= ~(LTDC_LxBFCR_BF2 | LTDC_LxBFCR_BF1);
  LTDC_LAYER(hltdc, LayerIdx)->BFCR = (pLayerCfg->BlendingFactor1 | pLayerCfg->BlendingFactor2);

  /* Configure the color frame buffer start address */
  LTDC_LAYER(hltdc, LayerIdx)->CFBAR &= ~(LTDC_LxCFBAR_CFBADD);
  LTDC_LAYER(hltdc, LayerIdx)->CFBAR = (pLayerCfg->FBStartAdress);

  if (pLayerCfg->PixelFormat == LTDC_PIXEL_FORMAT_ARGB8888)
  {
    tmp = 4U;
  }
  else if (pLayerCfg->PixelFormat == LTDC_PIXEL_FORMAT_RGB888)
  {
    tmp = 3U;
  }
  else if ((pLayerCfg->PixelFormat == LTDC_PIXEL_FORMAT_ARGB4444) || \
           (pLayerCfg->PixelFormat == LTDC_PIXEL_FORMAT_RGB565)   || \
           (pLayerCfg->PixelFormat == LTDC_PIXEL_FORMAT_ARGB1555) || \
           (pLayerCfg->PixelFormat == LTDC_PIXEL_FORMAT_AL88))
  {
    tmp = 2U;
  }
  else
  {
    tmp = 1U;
  }

  /* Configure the color frame buffer pitch in byte */
  LTDC_LAYER(hltdc, LayerIdx)->CFBLR  &= ~(LTDC_LxCFBLR_CFBLL | LTDC_LxCFBLR_CFBP);
  LTDC_LAYER(hltdc, LayerIdx)->CFBLR  = (((pLayerCfg->ImageWidth * tmp) << 16U) | (((pLayerCfg->WindowX1 - pLayerCfg->WindowX0) * tmp)  + 3U));
  /* Configure the frame buffer line number */
  LTDC_LAYER(hltdc, LayerIdx)->CFBLNR  &= ~(LTDC_LxCFBLNR_CFBLNBR);
  LTDC_LAYER(hltdc, LayerIdx)->CFBLNR  = (pLayerCfg->ImageHeight);

  /* Enable LTDC_Layer by setting LEN bit */
  LTDC_LAYER(hltdc, LayerIdx)->CR |= (uint32_t)LTDC_LxCR_LEN;
}