/**
* @brief LCD Configuration.
* @note This function Configure tha LTDC peripheral :
* 1) Configure the Pixel Clock for the LCD
* 2) Configure the LTDC Timing and Polarity
* 3) Configure the LTDC Layer 1 :
* - indirect color (L8) as pixel format
* - The frame buffer is located at FLASH memory
* - The Layer size configuration : 320x240
* 4) Configure the LTDC Layer 2 :
* - The frame buffer is located at FLASH memory
* - The Layer size configuration : 320x240
* 5) Load 256 colors in CLUT address for Layer 1
* @retval
* None
*/
static void LCD_Config(void)
{
LTDC_InitTypeDef LTDC_InitStruct;
LTDC_Layer_InitTypeDef LTDC_Layer_InitStruct;
LTDC_CLUT_InitTypeDef LTDC_CLUT_InitStruct;
uint32_t uwCounter = 0;
/* Enable Pixel Clock --------------------------------------------------------*/
/* Configure PLLSAI prescalers for LCD */
/* PLLSAI_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
/* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAI_N = 192 Mhz */
/* PLLLCDCLK = PLLSAI_VCO Output/PLLSAI_R = 192/3 = 64 Mhz */
/* LTDC clock frequency = PLLLCDCLK / RCC_PLLSAIDivR = 64/8 = 8 Mhz */
RCC_PLLSAIConfig(192, 7, 3);
RCC_LTDCCLKDivConfig(RCC_PLLSAIDivR_Div8);
/* Enable PLLSAI Clock */
RCC_PLLSAICmd(ENABLE);
/* Wait for PLLSAI activation */
while(RCC_GetFlagStatus(RCC_FLAG_PLLSAIRDY) == RESET)
{
}
/* Enable the LTDC Clock -----------------------------------------------------*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_LTDC, ENABLE);
/* Configure the LCD Control pins --------------------------------------------*/
LCD_AF_GPIOConfig();
/* Sets LCD backlight and display On -----------------------------------------*/
GPIO_SetBits(GPIOA, GPIO_Pin_8);
GPIO_SetBits(GPIOC, GPIO_Pin_6);
/* Initialize the LCD --------------------------------------------------------*/
/* Polarity configuration */
/* Initialize the horizontal synchronization polarity as active low*/
LTDC_InitStruct.LTDC_HSPolarity = LTDC_HSPolarity_AL;
/* Initialize the vertical synchronization polarity as active low */
LTDC_InitStruct.LTDC_VSPolarity = LTDC_VSPolarity_AL;
/* Initialize the data enable polarity as active low */
LTDC_InitStruct.LTDC_DEPolarity = LTDC_DEPolarity_AL;
/* Initialize the pixel clock polarity as input pixel clock */
LTDC_InitStruct.LTDC_PCPolarity = LTDC_PCPolarity_IPC;
/* Timing configuration */
/* Horizontal synchronization width = Hsync - 1 */
LTDC_InitStruct.LTDC_HorizontalSync = 40;
/* Vertical synchronization height = Vsync - 1 */
LTDC_InitStruct.LTDC_VerticalSync = 9;
/* Accumulated horizontal back porch = Hsync + HBP - 1 */
LTDC_InitStruct.LTDC_AccumulatedHBP = 42;
/* Accumulated vertical back porch = Vsync + VBP - 1 */
LTDC_InitStruct.LTDC_AccumulatedVBP = 11;
/* Accumulated active width = Hsync + HBP + Active Width - 1 */
LTDC_InitStruct.LTDC_AccumulatedActiveW = 522;
/* Accumulated active height = Vsync + VBP + Active Heigh - 1 */
LTDC_InitStruct.LTDC_AccumulatedActiveH = 283;
/* Total width = Hsync + HBP + Active Width + HFP - 1 */
LTDC_InitStruct.LTDC_TotalWidth = 524;
/* Total height = Vsync + VBP + Active Heigh + VFP - 1 */
LTDC_InitStruct.LTDC_TotalHeigh = 285;
/* Configure R,G,B component values for LCD background color */
LTDC_InitStruct.LTDC_BackgroundRedValue = 0;
LTDC_InitStruct.LTDC_BackgroundGreenValue = 0;
LTDC_InitStruct.LTDC_BackgroundBlueValue = 0;
/* Initialize LTDC */
LTDC_Init(<DC_InitStruct);
/* LCD initializing end ------------------------------------------------------*/
/* Layer1 Configuration ------------------------------------------------------*/
/* Windowing configuration */
/* In this case only 320x240 window of the active display area is used
to display a picture then :
Horizontal start = horizontal synchronization + Horizontal back porch = 43
Vertical start = vertical synchronization + vertical back porch = 12
Horizontal stop = Horizontal start + window width -1 = 43 + 320 -1
Vertical stop = Vertical start + window height -1 = 12 + 240 -1 */
LTDC_Layer_InitStruct.LTDC_HorizontalStart = 43;
LTDC_Layer_InitStruct.LTDC_HorizontalStop = (320 + 43 - 1);
LTDC_Layer_InitStruct.LTDC_VerticalStart = 12;
LTDC_Layer_InitStruct.LTDC_VerticalStop = (240 + 12 - 1);
/* Pixel Format configuration : indirect color (L8) */
LTDC_Layer_InitStruct.LTDC_PixelFormat = LTDC_Pixelformat_L8;
/* Alpha constant configuration */
LTDC_Layer_InitStruct.LTDC_ConstantAlpha = 255;
/* Default Color configuration (configure A,R,G,B component values) */
LTDC_Layer_InitStruct.LTDC_DefaultColorBlue = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorGreen = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorRed = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorAlpha = 0;
/* Blending Factors */
LTDC_Layer_InitStruct.LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_PAxCA;
LTDC_Layer_InitStruct.LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_PAxCA;
/* Start Address configuration : frame buffer is located at FLASH memory */
LTDC_Layer_InitStruct.LTDC_CFBStartAdress = (uint32_t)&L8_320x240;
/* the length of one line of pixels in bytes + 3 then :
Line Lenth = Active high width x number of bytes per pixel + 3
Active high width = 320
number of bytes per pixel = 1 (pixel_format : L8)
*/
LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((320 * 1) + 3);
/* the pitch is the increment from the start of one line of pixels to the
start of the next line in bytes, then :
Pitch = Active high width x number of bytes per pixel
*/
LTDC_Layer_InitStruct.LTDC_CFBPitch = (320 * 1);
/* Configure the number of lines */
LTDC_Layer_InitStruct.LTDC_CFBLineNumber = 240;
/* Initialize the Layer1 */
LTDC_LayerInit(LTDC_Layer1, <DC_Layer_InitStruct);
/* Layer1 Configuration end --------------------------------------------------*/
/* Layer2 Configuration ------------------------------------------------------*/
/* Windowing configuration */
/* In this case only 320x240 window of the active display area is used
to display a picture then :
Horizontal start = horizontal synchronization + offset_x + Horizontal back porch = 43
Vertical start = vertical synchronization + offset_y + vertical back porch = 12
Horizontal stop = Horizontal start + offset_x + window width -1 = 43 + 320 -1
Vertical stop = Vertical start + offset_y + window height -1 = 12 + 240 -1 */
LTDC_Layer_InitStruct.LTDC_HorizontalStart = 160 + 43;
LTDC_Layer_InitStruct.LTDC_HorizontalStop = (320 + 160 + 43 - 1);
LTDC_Layer_InitStruct.LTDC_VerticalStart = 32 + 12;
LTDC_Layer_InitStruct.LTDC_VerticalStop = (32 + 240 + 12 - 1);
/* Pixel Format configuration */
LTDC_Layer_InitStruct.LTDC_PixelFormat = LTDC_Pixelformat_RGB565;
/* Alpha constant configuration : The constant alpha for layer 2 is decreased
to see the layer 1 in the intersection zone*/
LTDC_Layer_InitStruct.LTDC_ConstantAlpha = 200;
/* Default Color configuration (configure A,R,G,B component values) */
LTDC_Layer_InitStruct.LTDC_DefaultColorBlue = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorGreen = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorRed = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorAlpha = 0;
/* blending Factors */
LTDC_Layer_InitStruct.LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_PAxCA;
LTDC_Layer_InitStruct.LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_PAxCA;
/* Configure Input Address : frame buffer is located at FLASH memory */
LTDC_Layer_InitStruct.LTDC_CFBStartAdress = (uint32_t)&RGB565_320x240;
/* the length of one line of pixels in bytes + 3 then :
Line Lenth = Active high width x number of bytes per pixel + 3
Active high width = 320
number of bytes per pixel = 2 (pixel_format : RGB565)
*/
LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((320 * 2) + 3);
LTDC_Layer_InitStruct.LTDC_CFBPitch = (320 * 2);
/* the pitch is the increment from the start of one line of pixels to the
start of the next line in bytes, then :
Pitch = Active high width x number of bytes per pixel
*/
LTDC_Layer_InitStruct.LTDC_CFBLineNumber = 240;
/* Initialize the Layer 2 */
LTDC_LayerInit(LTDC_Layer2, <DC_Layer_InitStruct);
/* Layer2 Configuration end --------------------------------------------------*/
/* CLUT loading --------------------------------------------------------------*/
/* Load 256 colors in CLUT address for Layer 1 */
for(uwCounter = 0; (uwCounter < 256); uwCounter++)
{
LTDC_CLUT_InitStruct.LTDC_CLUTAdress = uwCounter;
LTDC_CLUT_InitStruct.LTDC_BlueValue = (L8_320x240_CLUT[uwCounter] & 0xFF);
LTDC_CLUT_InitStruct.LTDC_GreenValue = (L8_320x240_CLUT[uwCounter] & 0xFF00) >> 8;
LTDC_CLUT_InitStruct.LTDC_RedValue = (L8_320x240_CLUT[uwCounter] & 0xFF0000) >> 16;
LTDC_CLUTInit(LTDC_Layer1, <DC_CLUT_InitStruct);
}
/* CLUT loading end ----------------------------------------------------------*/
}
static void LCD_DithCLUTLayerInit(void)
{
uint32_t uwCounter;
LTDC_CLUT_InitTypeDef LTDC_CLUT_InitStruct;
LTDC_LayerCmd(LTDC_Layer1, DISABLE);
/* Windowing configuration */
/* In this case all the active display area is used to display a picture then :
Horizontal start = horizontal synchronization + Horizontal back porch = 30
Horizontal stop = Horizontal start + window width -1 = 30 + 240 -1
Vertical start = vertical synchronization + vertical back porch = 4
Vertical stop = Vertical start + window height -1 = 4 + 320 -1 */
LTDC_Layer_InitStruct.LTDC_HorizontalStart = 30;
LTDC_Layer_InitStruct.LTDC_HorizontalStop = (LCD_PIXEL_WIDTH + 30 - 1);
LTDC_Layer_InitStruct.LTDC_VerticalStart = 4;
LTDC_Layer_InitStruct.LTDC_VerticalStop = (LCD_PIXEL_HEIGHT + 4 - 1);
/* Pixel Format configuration*/
LTDC_Layer_InitStruct.LTDC_PixelFormat = LTDC_Pixelformat_L8;
/* Alpha constant (255 totally opaque) */
LTDC_Layer_InitStruct.LTDC_ConstantAlpha = 255;
/* Default Color configuration (configure A,R,G,B component values) */
LTDC_Layer_InitStruct.LTDC_DefaultColorBlue = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorGreen = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorRed = 0;
LTDC_Layer_InitStruct.LTDC_DefaultColorAlpha = 0;
/* Configure blending factors */
LTDC_Layer_InitStruct.LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_CA;
LTDC_Layer_InitStruct.LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_CA;
/* the length of one line of pixels in bytes + 3 then :
Line Lenth = Active width x number of bytes per pixel + 3
Active width = LCD_PIXEL_WIDTH
number of bytes per pixel = 1 (pixel_format : L8)
*/
LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((LCD_PIXEL_WIDTH * 1) + 3);
/* the pitch is the increment from the start of one line of pixels to the
start of the next line in bytes, then :
Pitch = Active high width x number of bytes per pixel */
LTDC_Layer_InitStruct.LTDC_CFBPitch = (ImageDithCLUT_width * 1);
/* Configure the number of lines */
LTDC_Layer_InitStruct.LTDC_CFBLineNumber = LCD_PIXEL_HEIGHT;
/* Start Address configuration : the LCD Frame buffer is defined in Flash memory*/
LTDC_Layer_InitStruct.LTDC_CFBStartAdress = (uint32_t)ImageDithCLUT;
/* Initialize LTDC layer 1 */
LTDC_LayerInit(LTDC_Layer1, <DC_Layer_InitStruct);
/* CLUT loading --------------------------------------------------------------*/
/* Load 256 colors in CLUT address for Layer 1 */
for(uwCounter = 0; (uwCounter < 256); uwCounter++)
{
LTDC_CLUT_InitStruct.LTDC_CLUTAdress = uwCounter;
LTDC_CLUT_InitStruct.LTDC_BlueValue = (ImageDithCLUT_CLUT[uwCounter] & 0xFF);
LTDC_CLUT_InitStruct.LTDC_GreenValue = (ImageDithCLUT_CLUT[uwCounter] & 0xFF00) >> 8;
LTDC_CLUT_InitStruct.LTDC_RedValue = (ImageDithCLUT_CLUT[uwCounter] & 0xFF0000) >> 16;
LTDC_CLUTInit(LTDC_Layer1, <DC_CLUT_InitStruct);
}
/* CLUT loading end ----------------------------------------------------------*/
/* Enable CLUT for Layer 1 */
LTDC_CLUTCmd(LTDC_Layer1, ENABLE);
/* LTDC configuration reload */
LTDC_ReloadConfig(LTDC_SRCR_VBR);
/* Enable backgrounf layers */
LTDC_LayerCmd(LTDC_Layer1, ENABLE);
/* LTDC configuration reload */
LTDC_ReloadConfig(LTDC_SRCR_VBR);
}