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发表于 2016-12-5 12:22:02
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1.首先建议找一个demo，建议用官方STM32Cube的例程。目录是STM32Cube_FW_F4_V1.12.0\Projects\STM324x9I_EVAL\Examples\LTDC\LTDC_Display_1Layer
2.找到屏的手册，查看时序参数，在例程的基础上修改，比如官方demo,需要修改LCD_Config函数，如下：
[mw_shl_code=c,true]static void LCD_Config(void)
{
static LTDC_HandleTypeDef hltdc_F;
LTDC_LayerCfgTypeDef pLayerCfg;
/* LTDC Initialization -------------------------------------------------------*/
/* Polarity configuration */
/* Initialize the horizontal synchronization polarity as active low */
hltdc_F.Init.HSPolarity = LTDC_HSPOLARITY_AL;
/* Initialize the vertical synchronization polarity as active low */
hltdc_F.Init.VSPolarity = LTDC_VSPOLARITY_AL;
/* Initialize the data enable polarity as active low */
hltdc_F.Init.DEPolarity = LTDC_DEPOLARITY_AL;
/* Initialize the pixel clock polarity as input pixel clock */
hltdc_F.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
/* Timing configuration */
/* Horizontal synchronization width = Hsync - 1 */
hltdc_F.Init.HorizontalSync = 40;
/* Vertical synchronization height = Vsync - 1 */
hltdc_F.Init.VerticalSync = 9;
/* Accumulated horizontal back porch = Hsync + HBP - 1 */
hltdc_F.Init.AccumulatedHBP = 42;
/* Accumulated vertical back porch = Vsync + VBP - 1 */
hltdc_F.Init.AccumulatedVBP = 11;
/* Accumulated active width = Hsync + HBP + Active Width - 1 */
hltdc_F.Init.AccumulatedActiveH = 283;
/* Accumulated active height = Vsync + VBP + Active Heigh - 1 */
hltdc_F.Init.AccumulatedActiveW = 522;
/* Total height = Vsync + VBP + Active Heigh + VFP - 1 */
hltdc_F.Init.TotalHeigh = 285;
/* Total width = Hsync + HBP + Active Width + HFP - 1 */
hltdc_F.Init.TotalWidth = 524;
/* Configure R,G,B component values for LCD background color */
hltdc_F.Init.Backcolor.Blue = 0;
hltdc_F.Init.Backcolor.Green = 0;
hltdc_F.Init.Backcolor.Red = 0;
hltdc_F.Instance = LTDC;
/* Layer1 Configuration ------------------------------------------------------*/
/* Windowing configuration */
/* In this case all 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 + 480 -1
Vertical stop = Vertical start + window height -1 = 12 + 272 -1 */
pLayerCfg.WindowX0 = 0;
pLayerCfg.WindowX1 = 480;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = 272;
/* Pixel Format configuration*/
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;
/* Start Address configuration : frame buffer is located at FLASH memory */
pLayerCfg.FBStartAdress = (uint32_t)&RGB565_480x272;
/* Alpha constant (255 totally opaque) */
pLayerCfg.Alpha = 255;
/* Default Color configuration (configure A,R,G,B component values) */
pLayerCfg.Alpha0 = 0;
pLayerCfg.Backcolor.Blue = 0;
pLayerCfg.Backcolor.Green = 0;
pLayerCfg.Backcolor.Red = 0;
/* Configure blending factors */
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
/* Configure the number of lines and number of pixels per line */
pLayerCfg.ImageWidth = 480;
pLayerCfg.ImageHeight = 272;
/* Configure the LTDC */
if(HAL_LTDC_Init(&hltdc_F) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Configure the Layer */
if(HAL_LTDC_ConfigLayer(&hltdc_F, &pLayerCfg, 1) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
}
[/mw_shl_code]
3.根据你自己的硬件链接，修改IO配置，官方代码如下：
[mw_shl_code=c,true]void HAL_LTDC_MspInit(LTDC_HandleTypeDef *hltdc)
{
GPIO_InitTypeDef GPIO_Init_Structure;
/*##-1- Enable peripherals and GPIO Clocks #################################*/
/* Enable the LTDC Clock */
__HAL_RCC_LTDC_CLK_ENABLE();
/* Enable GPIO Clock */
__HAL_RCC_GPIOI_CLK_ENABLE();
__HAL_RCC_GPIOJ_CLK_ENABLE();
__HAL_RCC_GPIOK_CLK_ENABLE();
/*##-2- Configure peripheral GPIO ##########################################*/
/******************** LTDC Pins configuration *************************/
/* LTDC pins configuraiton: PI12 -- 15 */
GPIO_Init_Structure.Pin = GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15;
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_NOPULL;
GPIO_Init_Structure.Speed = GPIO_SPEED_FAST;
GPIO_Init_Structure.Alternate = GPIO_AF14_LTDC;
HAL_GPIO_Init(GPIOI, &GPIO_Init_Structure);
/* LTDC pins configuraiton: PJ0 -- 15 */
GPIO_Init_Structure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | \
GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_7 | \
GPIO_PIN_8 | GPIO_PIN_9 | GPIO_PIN_10 | GPIO_PIN_11 | \
GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15;
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_NOPULL;
GPIO_Init_Structure.Speed = GPIO_SPEED_FAST;
GPIO_Init_Structure.Alternate = GPIO_AF14_LTDC;
HAL_GPIO_Init(GPIOJ, &GPIO_Init_Structure);
/* LTDC pins configuraiton: PK0 -- 7 */
GPIO_Init_Structure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3 | \
GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_7;
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_NOPULL;
GPIO_Init_Structure.Speed = GPIO_SPEED_FAST;
GPIO_Init_Structure.Alternate = GPIO_AF14_LTDC;
HAL_GPIO_Init(GPIOK, &GPIO_Init_Structure);
}
[/mw_shl_code]
4.因为你的屏幕分辨率很高，所以要用到外扩的SDRAM，所以要确保SDRAM在LTDC之前已经初始化好，可参考官方代码，根据实际硬件连接修改：
[mw_shl_code=applescript,true]void SystemInit_ExtMemCtl(void)
{
#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
#if defined (DATA_IN_ExtSDRAM)
register uint32_t tmpreg = 0, timeout = 0xFFFF;
register __IO uint32_t index;
/* Enable GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH and GPIOI interface
clock */
RCC->AHB1ENR |= 0x000001F8;
/* Connect PDx pins to FMC Alternate function */
GPIOD->AFR[0] = 0x000000CC;
GPIOD->AFR[1] = 0xCC000CCC;
/* Configure PDx pins in Alternate function mode */
GPIOD->MODER = 0xA02A000A;
/* Configure PDx pins speed to 50 MHz */
GPIOD->OSPEEDR = 0xA02A000A;
/* Configure PDx pins Output type to push-pull */
GPIOD->OTYPER = 0x00000000;
/* No pull-up, pull-down for PDx pins */
GPIOD->PUPDR = 0x00000000;
/* Connect PEx pins to FMC Alternate function */
GPIOE->AFR[0] = 0xC00000CC;
GPIOE->AFR[1] = 0xCCCCCCCC;
/* Configure PEx pins in Alternate function mode */
GPIOE->MODER = 0xAAAA800A;
/* Configure PEx pins speed to 50 MHz */
GPIOE->OSPEEDR = 0xAAAA800A;
/* Configure PEx pins Output type to push-pull */
GPIOE->OTYPER = 0x00000000;
/* No pull-up, pull-down for PEx pins */
GPIOE->PUPDR = 0x00000000;
/* Connect PFx pins to FMC Alternate function */
GPIOF->AFR[0] = 0xCCCCCCCC;
GPIOF->AFR[1] = 0xCCCCCCCC;
/* Configure PFx pins in Alternate function mode */
GPIOF->MODER = 0xAA800AAA;
/* Configure PFx pins speed to 50 MHz */
GPIOF->OSPEEDR = 0xAA800AAA;
/* Configure PFx pins Output type to push-pull */
GPIOF->OTYPER = 0x00000000;
/* No pull-up, pull-down for PFx pins */
GPIOF->PUPDR = 0x00000000;
/* Connect PGx pins to FMC Alternate function */
GPIOG->AFR[0] = 0xCCCCCCCC;
GPIOG->AFR[1] = 0xCCCCCCCC;
/* Configure PGx pins in Alternate function mode */
GPIOG->MODER = 0xAAAAAAAA;
/* Configure PGx pins speed to 50 MHz */
GPIOG->OSPEEDR = 0xAAAAAAAA;
/* Configure PGx pins Output type to push-pull */
GPIOG->OTYPER = 0x00000000;
/* No pull-up, pull-down for PGx pins */
GPIOG->PUPDR = 0x00000000;
/* Connect PHx pins to FMC Alternate function */
GPIOH->AFR[0] = 0x00C0CC00;
GPIOH->AFR[1] = 0xCCCCCCCC;
/* Configure PHx pins in Alternate function mode */
GPIOH->MODER = 0xAAAA08A0;
/* Configure PHx pins speed to 50 MHz */
GPIOH->OSPEEDR = 0xAAAA08A0;
/* Configure PHx pins Output type to push-pull */
GPIOH->OTYPER = 0x00000000;
/* No pull-up, pull-down for PHx pins */
GPIOH->PUPDR = 0x00000000;
/* Connect PIx pins to FMC Alternate function */
GPIOI->AFR[0] = 0xCCCCCCCC;
GPIOI->AFR[1] = 0x00000CC0;
/* Configure PIx pins in Alternate function mode */
GPIOI->MODER = 0x0028AAAA;
/* Configure PIx pins speed to 50 MHz */
GPIOI->OSPEEDR = 0x0028AAAA;
/* Configure PIx pins Output type to push-pull */
GPIOI->OTYPER = 0x00000000;
/* No pull-up, pull-down for PIx pins */
GPIOI->PUPDR = 0x00000000;
/*-- FMC Configuration ------------------------------------------------------*/
/* Enable the FMC interface clock */
RCC->AHB3ENR |= 0x00000001;
/* Configure and enable SDRAM bank1 */
FMC_Bank5_6->SDCR[0] = 0x000019E4;
FMC_Bank5_6->SDTR[0] = 0x01115351;
/* SDRAM initialization sequence */
/* Clock enable command */
FMC_Bank5_6->SDCMR = 0x00000011;
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
while((tmpreg != 0) && (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* Delay */
for (index = 0; index<1000; index++);
/* PALL command */
FMC_Bank5_6->SDCMR = 0x00000012;
timeout = 0xFFFF;
while((tmpreg != 0) && (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* Auto refresh command */
FMC_Bank5_6->SDCMR = 0x00000073;
timeout = 0xFFFF;
while((tmpreg != 0) && (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* MRD register program */
FMC_Bank5_6->SDCMR = 0x00046014;
timeout = 0xFFFF;
while((tmpreg != 0) && (timeout-- > 0))
{
tmpreg = FMC_Bank5_6->SDSR & 0x00000020;
}
/* Set refresh count */
tmpreg = FMC_Bank5_6->SDRTR;
FMC_Bank5_6->SDRTR = (tmpreg | (0x0000027C<<1));
/* Disable write protection */
tmpreg = FMC_Bank5_6->SDCR[0];
FMC_Bank5_6->SDCR[0] = (tmpreg & 0xFFFFFDFF);
#endif /* DATA_IN_ExtSDRAM */
#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */
}
[/mw_shl_code]
5.还需要确保系统时钟配置正确，以及LTDC的时钟配置正确，并且LTDC输出的CLK在屏的支持范围以内，可参考官方代码：
[mw_shl_code=applescript,true]static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/*##-1- System Clock Configuration #########################################*/
/* Enable HSE Oscillator and activate PLL with HSE as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 25;
RCC_OscInitStruct.PLL.PLLN = 360;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 7;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
/* Activate the Over-Drive mode */
HAL_PWREx_EnableOverDrive();
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
/*##-2- LTDC Clock Configuration ###########################################*/
/* LCD clock configuration */
/* PLLSAI_VCO Input = HSE_VALUE/PLL_M = 1 MHz */
/* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAIN = 192 MHz */
/* PLLLCDCLK = PLLSAI_VCO Output/PLLSAIR = 192/5 = 38.4 MHz */
/* LTDC clock frequency = PLLLCDCLK / LTDC_PLLSAI_DIVR_4 = 38.4/4 = 9.6 MHz */
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC;
PeriphClkInitStruct.PLLSAI.PLLSAIN = 192;
PeriphClkInitStruct.PLLSAI.PLLSAIR = 5;
PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_4;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
}
[/mw_shl_code]
做完以上移植，你的屏就有显示了。
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