关于 11-LTDC—液晶显示英文例程 LCD_Clear 函数问题

beyondabcd

/**
* @brief  Clears the hole LCD.
* @param  Color: the color of the background.
* @retval None
*/

void LCD_Clear(uint16_t Color)
{

DMA2D_InitTypeDef      DMA2D_InitStruct;

uint16_t Red_Value = 0, Green_Value = 0, Blue_Value = 0;

Red_Value = (0xF800 & CurrentTextColor) >> 11;
Blue_Value = 0x001F & CurrentTextColor;
Green_Value = (0x07E0 & CurrentTextColor) >> 5;


/* configure DMA2D */
DMA2D_DeInit();
DMA2D_InitStruct.DMA2D_Mode = DMA2D_R2M;
DMA2D_InitStruct.DMA2D_CMode = DMA2D_RGB565;
DMA2D_InitStruct.DMA2D_OutputGreen = Green_Value;
DMA2D_InitStruct.DMA2D_OutputBlue = Blue_Value;
DMA2D_InitStruct.DMA2D_OutputRed = Red_Value;
DMA2D_InitStruct.DMA2D_OutputAlpha = (Color&0x8000) ? 0xFF:0x00;                //设置透明度
DMA2D_InitStruct.DMA2D_OutputMemoryAdd = CurrentFrameBuffer;
DMA2D_InitStruct.DMA2D_OutputOffset = 0;
DMA2D_InitStruct.DMA2D_NumberOfLine = LCD_PIXEL_HEIGHT;
DMA2D_InitStruct.DMA2D_PixelPerLine = LCD_PIXEL_WIDTH;
DMA2D_Init(&DMA2D_InitStruct);

/* Start Transfer */
DMA2D_StartTransfer();

/* Wait for CTC Flag activation */
while(DMA2D_GetFlagStatus(DMA2D_FLAG_TC) == RESET)
{
}

LCD_SetTextColor(CurrentTextColor);  
}

这个函数中，为什么最后要用一个 LCD_SetTextColor(CurrentTextColor)呢？
DMA2D_StartTransfer()这句不是已经把背景颜色写好了吗？

beyondabcd

/**
* @brief  Config and Sets the color Keying.
* @param  RGBValue: Specifies the Color reference.
* @retval None
*/
void LCD_SetColorKeying(uint32_t RGBValue)
{
LTDC_ColorKeying_InitTypeDef   LTDC_colorkeying_InitStruct;

/* configure the color Keying */
LTDC_colorkeying_InitStruct.LTDC_ColorKeyBlue = 0x0000FF & RGBValue;
LTDC_colorkeying_InitStruct.LTDC_ColorKeyGreen = (0x00FF00 & RGBValue) >> 8;
LTDC_colorkeying_InitStruct.LTDC_ColorKeyRed = (0xFF0000 & RGBValue) >> 16;

if (CurrentLayer == LCD_BACKGROUND_LAYER)
{
   /* Enable the color Keying for Layer1 */
   LTDC_ColorKeyingConfig(LTDC_Layer1, &LTDC_colorkeying_InitStruct, ENABLE);
   LTDC_ReloadConfig(LTDC_IMReload);
}
else
{
   /* Enable the color Keying for Layer2 */
   LTDC_ColorKeyingConfig(LTDC_Layer2, &LTDC_colorkeying_InitStruct, ENABLE);
   LTDC_ReloadConfig(LTDC_IMReload);
}
}

这个函数是什么意思，主要是干什么的？

flyleaf

这函数写错了，
把这些改了：
Red_Value = (0xF800 & CurrentTextColor) >> 11;
Blue_Value = 0x001F & CurrentTextColor;
Green_Value = (0x07E0 & CurrentTextColor) >> 5;

currentTextColor 改成 Color

beyondabcd

谢谢，好，我回去试试