2015-03-28 08:00 AM
if you need more than the width of the image width of the visible region it is necessary to change the HAL
DM00031020.pdf
16.7.23 LTDC Layerx Color Frame Buffer Length Register (LTDC_LxCFBLR)(where x=1..2)This register defines the color frame buffer line length and pitch.Bits 31:29 Reserved, must be kept at reset valuerBits 28:16 CFBP[17:0]: Color Frame Buffer Pitch in bytesThese bits define the pitch which is the increment from the start of one line of pixels to the start of the next line in bytes
.Bits 15:13 Reserved, must be kept at reset valueBits 12:0 CFBLL[12:0]: Color Frame Buffer Line LengthThese bits define the length of one line of pixels in bytes + 3.
The line length is computed as follows: Active high width x number of bytes per pixel + 3.
stm32f4xx_hal_ltdc.c
/** * @brief Configures the LTDC peripheral * @param hltdc : Pointer to a LTDC_HandleTypeDef structure that contains * the configuration information for the LTDC. * @param pLayerCfg: Pointer LTDC Layer Configuration structure * @param LayerIdx: LTDC Layer index. * This parameter can be one of the following values: 0 or 1 * @retval None */static void LTDC_SetConfig(LTDC_HandleTypeDef *hltdc, LTDC_LayerCfgTypeDef *pLayerCfg, uint32_t LayerIdx){ uint32_t tmp = 0; uint32_t tmp1 = 0; uint32_t tmp2 = 0; /* Configures the horizontal start and stop position */ tmp = ((pLayerCfg->WindowX1 + ((hltdc->Instance->BPCR & LTDC_BPCR_AHBP) >> 16)) << 16); LTDC_LAYER(hltdc, LayerIdx)->WHPCR &= ~(LTDC_LxWHPCR_WHSTPOS | LTDC_LxWHPCR_WHSPPOS); LTDC_LAYER(hltdc, LayerIdx)->WHPCR = ((pLayerCfg->WindowX0 + ((hltdc->Instance->BPCR & LTDC_BPCR_AHBP) >> 16) + 1) | tmp); /* Configures the vertical start and stop position */ tmp = ((pLayerCfg->WindowY1 + (hltdc->Instance->BPCR & LTDC_BPCR_AVBP)) << 16); LTDC_LAYER(hltdc, LayerIdx)->WVPCR &= ~(LTDC_LxWVPCR_WVSTPOS | LTDC_LxWVPCR_WVSPPOS); LTDC_LAYER(hltdc, LayerIdx)->WVPCR = ((pLayerCfg->WindowY0 + (hltdc->Instance->BPCR & LTDC_BPCR_AVBP) + 1) | tmp); /* Specifies the pixel format */ LTDC_LAYER(hltdc, LayerIdx)->PFCR &= ~(LTDC_LxPFCR_PF); LTDC_LAYER(hltdc, LayerIdx)->PFCR = (pLayerCfg->PixelFormat); /* Configures the default color values */ tmp = ((uint32_t)(pLayerCfg->Backcolor.Green) << 8); tmp1 = ((uint32_t)(pLayerCfg->Backcolor.Red) << 16); tmp2 = (pLayerCfg->Alpha0 << 24); 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); /* Configures 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 = 4; } else if (pLayerCfg->PixelFormat == LTDC_PIXEL_FORMAT_RGB888) { tmp = 3; } 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 = 2; } else { tmp = 1; } /* Configures 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) << 16) | ((pLayerCfg->ImageWidth * tmp) + 3));
LTDC_LAYER(hltdc, LayerIdx)->CFBLR = (((pLayerCfg->ImageWidth * tmp) << 16) | (((pLayerCfg->WindowX1 - pLayerCfg->WindowX0) * tmp) + 3));
/* Configures 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;}