好记心不如烂笔头，为了方便以后快速查阅代码，提高开发效率，在这里特将LTDC驱动的初始化代码贴上来。本代码是基于ST官方STM32F429 Discovery Demo板的，学习LTDC驱动时参考了Demo板的官方例程，但是总觉得官方例程写得有点繁琐，不简洁明了，于是在此基础上重新整理代码得到如下初始化模板。 关于Discovery Demo板的原理图及例程，可以到这里去下载：http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF259090 关于本工程源码，请直接点击附件下载。
说明：本测试例程只使用了Layer1，显示缓冲区为FrameBuffer，颜 {MOD}格式为RGB565，初始时缓冲区为0，所以显示Layer1时是全黑 {MOD}，如果不使能Layer1只显示background，则屏幕显示为红 {MOD}。
LCD初始化函数： [mw_shl_code=c,true]void LCD_Init(void) { LTDC_InitTypeDef LTDC_InitStruct; /* Configure the LCD Control pins ------------------------------------------*/ LCD_CtrlLinesConfig(); /* Configure the LCD_SPI interface -----------------------------------------*/ LCD_SPI_Config(); /* Power on the LCD --------------------------------------------------------*/ LCD_PowerOn(); /* Enable the LTDC Clock */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_LTDC, ENABLE); /* Configure the LCD Control pins */ LCD_GPIO_Config(); /* 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) { } /* LTDC Initialization -----------------------------------------------------*/ /* 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 */ /* Configure horizontal synchronization width */ //LTDC_InitStruct.LTDC_HorizontalSync = 9; LTDC_InitStruct.LTDC_HorizontalSync = 9; /* Configure vertical synchronization height */ LTDC_InitStruct.LTDC_VerticalSync = 1; /* Configure accumulated horizontal back porch */ LTDC_InitStruct.LTDC_AccumulatedHBP = 29; /* Configure accumulated vertical back porch */ LTDC_InitStruct.LTDC_AccumulatedVBP = 3; /* Configure accumulated active width */ LTDC_InitStruct.LTDC_AccumulatedActiveW = 269; /* Configure accumulated active height */ LTDC_InitStruct.LTDC_AccumulatedActiveH = 323; /* Configure total width */ LTDC_InitStruct.LTDC_TotalWidth = 279; /* Configure total height */ LTDC_InitStruct.LTDC_TotalHeigh = 327; /* Configure R,G,B component values for LCD background color */ LTDC_InitStruct.LTDC_BackgroundRedValue = 0xff; LTDC_InitStruct.LTDC_BackgroundGreenValue = 0; LTDC_InitStruct.LTDC_BackgroundBlueValue = 0; LTDC_Init(<DC_InitStruct); } [/mw_shl_code] LCD串行控制信号线配置：
[mw_shl_code=c,true]void LCD_CtrlLinesConfig(void) { GPIO_InitTypeDef GPIO_InitStructure; /* Enable GPIOs clock*/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE); /* Configure NCS in Output Push-Pull mode */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Configure WRX in Output Push-Pull mode */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; GPIO_Init(GPIOD, &GPIO_InitStructure); /* Set chip select pin high */ GPIO_SetBits(GPIOC, GPIO_Pin_2); } [/mw_shl_code] [mw_shl_code=c,true]void LCD_SPI_Config(void) { SPI_InitTypeDef SPI_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; /* Enable LCD_SPI_SCK_GPIO_CLK, LCD_SPI_MISO_GPIO_CLK and LCD_SPI_MOSI_GPIO_CLK clock */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE); /* Enable LCD_SPI and SYSCFG clock */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI5, ENABLE); /* Configure LCD_SPI SCK pin */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; GPIO_Init(GPIOF, &GPIO_InitStructure); /* Configure LCD_SPI MISO pin */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; GPIO_Init(GPIOF, &GPIO_InitStructure); /* Configure LCD_SPI MOSI pin */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_Init(GPIOF, &GPIO_InitStructure); /* Connect SPI SCK */ GPIO_PinAFConfig(GPIOF, GPIO_PinSource7, GPIO_AF_SPI5); /* Connect SPI MISO */ GPIO_PinAFConfig(GPIOF, GPIO_PinSource8, GPIO_AF_SPI5); /* Connect SPI MOSI */ GPIO_PinAFConfig(GPIOF, GPIO_PinSource9, GPIO_AF_SPI5); SPI_I2S_DeInit(SPI5); /* SPI configuration -------------------------------------------------------*/ SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; SPI_InitStructure.SPI_Mode = SPI_Mode_Master; SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; /* SPI baudrate is set to 5.6 MHz (PCLK2/SPI_BaudRatePrescaler = 90/16 = 5.625 MHz) to verify these constraints: - ILI9341 LCD SPI interface max baudrate is 10MHz for write and 6.66MHz for read - l3gd20 SPI interface max baudrate is 10MHz for write/read - PCLK2 frequency is set to 90 MHz */ SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStructure.SPI_CRCPolynomial = 7; SPI_Init(SPI5, &SPI_InitStructure); /* Enable L3GD20_SPI */ SPI_Cmd(SPI5, ENABLE); } [/mw_shl_code]
LCD同步信号及数据信号GPIO配置：
[mw_shl_code=c,true]void LCD_GPIO_Config(void) { GPIO_InitTypeDef GPIO_InitStruct; /* Enable GPIOI, GPIOJ, GPIOG, GPIOF, GPIOH AHB Clocks */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOF | RCC_AHB1Periph_GPIOG, ENABLE); /* GPIOs Configuration */ /* +------------------------+-----------------------+----------------------------+ + LCD pins assignment + +------------------------+-----------------------+----------------------------+ | LCD_TFT R2 <-> PC.12 | LCD_TFT G2 <-> PA.06 | LCD_TFT B2 <-> PD.06 | | LCD_TFT R3 <-> PB.00 | LCD_TFT G3 <-> PG.10 | LCD_TFT B3 <-> PG.11 | | LCD_TFT R4 <-> PA.11 | LCD_TFT G4 <-> PB.10 | LCD_TFT B4 <-> PG.12 | | LCD_TFT R5 <-> PA.12 | LCD_TFT G5 <-> PB.11 | LCD_TFT B5 <-> PA.03 | | LCD_TFT R6 <-> PB.01 | LCD_TFT G6 <-> PC.07 | LCD_TFT B6 <-> PB.08 | | LCD_TFT R7 <-> PG.06 | LCD_TFT G7 <-> PD.03 | LCD_TFT B7 <-> PB.09 | ------------------------------------------------------------------------------- | LCD_TFT HSYNC <-> PC.06 | LCDTFT VSYNC <-> PA.04 | | LCD_TFT CLK <-> PG.07 | LCD_TFT DE <-> PF.10 | ----------------------------------------------------- */ /* GPIOA configuration */ GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOA, GPIO_PinSource12, GPIO_AF_LTDC); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_6 | GPIO_Pin_11 | GPIO_Pin_12; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct); /* GPIOB configuration */ GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_LTDC); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11; GPIO_Init(GPIOB, &GPIO_InitStruct); /* GPIOC configuration */ GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_LTDC); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;// | GPIO_Pin_10; GPIO_Init(GPIOC, &GPIO_InitStruct); /* GPIOD configuration */ GPIO_PinAFConfig(GPIOD, GPIO_PinSource3, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_LTDC); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_6; GPIO_Init(GPIOD, &GPIO_InitStruct); /* GPIOF configuration */ GPIO_PinAFConfig(GPIOF, GPIO_PinSource10, GPIO_AF_LTDC); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10; GPIO_Init(GPIOF, &GPIO_InitStruct); /* GPIOG configuration */ GPIO_PinAFConfig(GPIOG, GPIO_PinSource6, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOG, GPIO_PinSource7, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOG, GPIO_PinSource10, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOG, GPIO_PinSource11, GPIO_AF_LTDC); GPIO_PinAFConfig(GPIOG, GPIO_PinSource12, GPIO_AF_LTDC); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12; GPIO_Init(GPIOG, &GPIO_InitStruct); } [/mw_shl_code]
LCD上电初始化序列，请对照LCD datasheet要求进行配置，此处省略部分内容：
[mw_shl_code=c,true]/** * @brief Configure the LCD controller (Power On sequence as described in ILI9341 Datasheet) * @param None * @retval None */ void LCD_PowerOn(void) { LCD_WriteCommand(0xCA); LCD_WriteData(0xC3); LCD_WriteData(0x08); LCD_WriteData(0x50); LCD_WriteCommand(LCD_POWERB); LCD_WriteData(0x00); LCD_WriteData(0xC1); LCD_WriteData(0x30); LCD_WriteCommand(LCD_POWER_SEQ); LCD_WriteData(0x64); LCD_WriteData(0x03); LCD_WriteData(0x12); LCD_WriteData(0x81); ... LCD_WriteCommand(LCD_SLEEP_OUT); delay(200); LCD_WriteCommand(LCD_DISPLAY_ON); /* GRAM start writing */ LCD_WriteCommand(LCD_GRAM); } [/mw_shl_code]
Layer初始化：
[mw_shl_code=c,true]void LCD_Layer1Init(void) { LTDC_Layer_InitTypeDef LTDC_Layer_InitStruct; /* 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 + 160 -1 */ LTDC_Layer_InitStruct.LTDC_HorizontalStart = 30; LTDC_Layer_InitStruct.LTDC_HorizontalStop = (240 + 30 - 1); LTDC_Layer_InitStruct.LTDC_VerticalStart = 4; LTDC_Layer_InitStruct.LTDC_VerticalStop = 320 + 4 -1; /* Pixel Format configuration*/ LTDC_Layer_InitStruct.LTDC_PixelFormat = LTDC_Pixelformat_RGB565; /* Alpha constant (255 totally opaque) */ LTDC_Layer_InitStruct.LTDC_ConstantAlpha = 255; /* Configure blending factors */ LTDC_Layer_InitStruct.LTDC_BlendingFactor_1 = LTDC_BlendingFactor1_PAxCA; LTDC_Layer_InitStruct.LTDC_BlendingFactor_2 = LTDC_BlendingFactor2_PAxCA; /* 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; /* Input Address configuration */ LTDC_Layer_InitStruct.LTDC_CFBStartAdress = (u32)FrameBuffer; /* 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 = 240 number of bytes per pixel = 2 (pixel_format : RGB565) */ LTDC_Layer_InitStruct.LTDC_CFBLineLength = ((240 * 2) + 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 = (240 * 2); /* configure the number of lines */ LTDC_Layer_InitStruct.LTDC_CFBLineNumber = 320; LTDC_LayerInit(LTDC_Layer1, <DC_Layer_InitStruct); LTDC_LayerCmd(LTDC_Layer1, ENABLE); LTDC_ReloadConfig(ENABLE); } [/mw_shl_code]
主程序：
[mw_shl_code=c,true]int main(void) { LCD_Init(); LCD_Layer1Init(); LTDC_Cmd(ENABLE); while(1); } [/mw_shl_code]
本贴摘自于本人博客：http://blog.csdn.net/hexiaolong2009/article/details/43986205