软件：RT Thread Studio sdram:
stm36
sdram: W9812G2 16M 322 SDRAM RGBbit4.3
寸屏幕，尺寸为400*400
原理图接口
Step1： RGB之SDRAM配置修改程序的上进行
使用 cubemx 配置 LTDC
根据RGB屏幕要求修改系统时钟
步骤2复制drv_lcd.c到驱动文件夹内
：[drv_lcd.c位置] "D:/RT-ThreadStudio/repo/Extract/RT-Thread_Source_Code/RT-Thread/4.1.0/bsp/
STM32/libraries/HAL_Drivers"
Step3：修改drv_lcd.c文件
3.1 在drv_lcd.c中添加头文件
#include
#ifdef BSP_USING_LCD
#include
#include
#include
#define DRV_DEBUG
#define LOG_TAG "drv.lcd"
#include
3.2 在drv_lcd.c中添加RGB屏幕的GPIO口初始化函数
打开“ cubemx/Src”文件夹里面的ltdc.c，将
void HAL_LTDC_MspInit(LTDC_HandleTypeDef* ltdcHandle)函数复制到drv_lcd.c 文件内，并将函数名改为static void MX_LTDC_MspInit(void)，修改后如下
static void MX_LTDC_MspInit(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
/** Initializes the peripherals clock */
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC;
PeriphClkInitStruct.PLLSAI.PLLSAIN = 150;
PeriphClkInitStruct.PLLSAI.PLLSAIR = 3;
PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_2;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
/* LTDC clock enable */
__HAL_RCC_LTDC_CLK_ENABLE();
__HAL_RCC_GPIOI_CLK_ENABLE();
__HAL_RCC_GPIOJ_CLK_ENABLE();
__HAL_RCC_GPIOK_CLK_ENABLE();
/**LTDC GPIO Configuration
PI12 ------> LTDC_HSYNC
PI13 ------> LTDC_VSYNC
PI14 ------> LTDC_CLK
PI15 ------> LTDC_R0
PJ0 ------> LTDC_R1
PJ1 ------> LTDC_R2
PJ2 ------> LTDC_R3
PJ3 ------> LTDC_R4
PJ4 ------> LTDC_R5
PJ5 ------> LTDC_R6
PJ6 ------> LTDC_R7
PJ7 ------> LTDC_G0
PJ8 ------> LTDC_G1
PJ9 ------> LTDC_G2
PJ10 ------> LTDC_G3
PJ11 ------> LTDC_G4
PK0 ------> LTDC_G5
PK1 ------> LTDC_G6
PK2 ------> LTDC_G7
PJ12 ------> LTDC_B0
PJ13 ------> LTDC_B1
PJ14 ------> LTDC_B2
PJ15 ------> LTDC_B3
PK3 ------> LTDC_B4
PK4 ------> LTDC_B5
PK5 ------> LTDC_B6
PK6 ------> LTDC_B7
PK7 ------> LTDC_DE
*/
GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
GPIO_InitStruct.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_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
HAL_GPIO_Init(GPIOJ, &GPIO_InitStruct);
GPIO_InitStruct.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_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
HAL_GPIO_Init(GPIOK, &GPIO_InitStruct);
GPIO_InitStruct.Pin =
GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
HAL_GPIO_Init(GPIOJ, &GPIO_InitStruct);
}
3.3 将static void MX_LTDC_MspInit(void)函数添加到drv_lcd.c里面的 rt_err_t stm32_lcd_init(struct drv_lcd_device *lcd)函数中
rt_err_t stm32_lcd_init(struct drv_lcd_device *lcd)
{
LTDC_LayerCfgTypeDef pLayerCfg = {0};
/* LTDC GPIO Initialization -------------------------------------------------------*/
MX_LTDC_MspInit(); //RGB屏幕GPIO初始化，并启用时钟
/* LTDC Initialization -------------------------------------------------------*/
/* Polarity configuration */
/* Initialize the horizontal synchronization polarity as active low */
LtdcHandle.Init.HSPolarity = LTDC_HSPOLARITY_AL;
/* Initialize the vertical synchronization polarity as active low */
LtdcHandle.Init.VSPolarity = LTDC_VSPOLARITY_AL;
/* Initialize the data enable polarity as active low */
LtdcHandle.Init.DEPolarity = LTDC_DEPOLARITY_AL;
/* Initialize the pixel clock polarity as input pixel clock */
LtdcHandle.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
/* Timing configuration */
/* Horizontal synchronization width = Hsync - 1 */
LtdcHandle.Init.HorizontalSync = LCD_HSYNC_WIDTH - 1;
/* Vertical synchronization height = Vsync - 1 */
LtdcHandle.Init.VerticalSync = LCD_VSYNC_HEIGHT - 1;
/* Accumulated horizontal back porch = Hsync + HBP - 1 */
LtdcHandle.Init.AccumulatedHBP = LCD_HSYNC_WIDTH + LCD_HBP - 1;
/* Accumulated vertical back porch = Vsync + VBP - 1 */
LtdcHandle.Init.AccumulatedVBP = LCD_VSYNC_HEIGHT + LCD_VBP - 1;
/* Accumulated active width = Hsync + HBP + Active Width - 1 */
LtdcHandle.Init.AccumulatedActiveW = LCD_HSYNC_WIDTH + LCD_HBP + lcd->lcd_info.width - 1 ;
/* Accumulated active height = Vsync + VBP + Active Heigh - 1 */
LtdcHandle.Init.AccumulatedActiveH = LCD_VSYNC_HEIGHT + LCD_VBP + lcd->lcd_info.height - 1;
/* Total height = Vsync + VBP + Active Heigh + VFP - 1 */
LtdcHandle.Init.TotalHeigh = LtdcHandle.Init.AccumulatedActiveH + LCD_VFP;
/* Total width = Hsync + HBP + Active Width + HFP - 1 */
LtdcHandle.Init.TotalWidth = LtdcHandle.Init.AccumulatedActiveW + LCD_HFP;
/* Configure R,G,B component values for LCD background color */
LtdcHandle.Init.Backcolor.Blue = 0;
LtdcHandle.Init.Backcolor.Green = 0;
LtdcHandle.Init.Backcolor.Red = 0;
LtdcHandle.Instance = LTDC;
/* Layer1 Configuration ------------------------------------------------------*/
/* Windowing configuration */
pLayerCfg.WindowX0 = 0;
pLayerCfg.WindowX1 = lcd->lcd_info.width;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = lcd->lcd_info.height;
/* Pixel Format configuration*/
if (lcd->lcd_info.pixel_format == RTGRAPHIC_PIXEL_FORMAT_RGB565)
{
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;
}
else if (lcd->lcd_info.pixel_format == RTGRAPHIC_PIXEL_FORMAT_ARGB888)
{
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_ARGB8888;
}
else if (lcd->lcd_info.pixel_format == RTGRAPHIC_PIXEL_FORMAT_RGB888)
{
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB888;
}
else if (lcd->lcd_info.pixel_format == RTGRAPHIC_PIXEL_FORMAT_RGB888)
{
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB888;
}
else
{
LOG_E("unsupported pixel format");
return -RT_ERROR;
}
/* Start Address configuration : frame buffer is located at FLASH memory */
pLayerCfg.FBStartAdress = (uint32_t)lcd->front_buf;
// pLayerCfg.FBStartAdress = 0xD0000000;
/* 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 */
/* Constant Alpha value: pLayerCfg.Alpha / 255
C: Current Layer Color
Cs: Background color
BC = Constant Alpha x C + (1 - Constant Alpha ) x Cs */
/* BlendingFactor1: Pixel Alpha x Constant Alpha */
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
/* BlendingFactor2: 1 - (Pixel Alpha x Constant Alpha) */
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
/* Configure the number of lines and number of pixels per line */
pLayerCfg.ImageWidth = lcd->lcd_info.width;
pLayerCfg.ImageHeight = lcd->lcd_info.height;
/* Configure the LTDC */
if (HAL_LTDC_Init(&LtdcHandle) != HAL_OK)
{
LOG_E("LTDC init failed");
return -RT_ERROR;
}
/* Configure the Background Layer*/
if (HAL_LTDC_ConfigLayer(&LtdcHandle, &pLayerCfg, 0) != HAL_OK)
{
LOG_E("LTDC layer init failed");
return -RT_ERROR;
}
else
{
/* enable LTDC interrupt */
HAL_NVIC_SetPriority(LTDC_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(LTDC_IRQn);
LOG_D("LTDC init success");
return RT_EOK;
}
}
步骤4：复制lcd_port.h到driver/include文件夹内 [lcd_port.h]位置"D:/RT-ThreadStudio/repo/Extract/RT-Thread_Source_Code/RT-Thread/4.1.0/bsp/stm32/stm32f429-挑战者/板/端口"
步骤4根据规格进行， 修改RGB为客户端的屏幕截图5：为细分界面为PD13，参数配置
#ifndef __LCD_PORT_H__
#define __LCD_PORT_H__
/* FanKe 4.3 inch screen, 800 * 480 */
#define LCD_WIDTH 800
#define LCD_HEIGHT 480
#define LCD_BITS_PER_PIXEL 16
#define LCD_BUF_SIZE (LCD_WIDTH * LCD_HEIGHT * LCD_BITS_PER_PIXEL / 8)
#define LCD_PIXEL_FORMAT RTGRAPHIC_PIXEL_FORMAT_RGB565
#define LCD_HSYNC_WIDTH 1
#define LCD_VSYNC_HEIGHT 1
#define LCD_HBP 80
#define LCD_VBP 40
#define LCD_HFP 200
#define LCD_VFP 22
/* 屏幕背光引脚 */
#define LCD_BACKLIGHT_USING_GPIO
#define LCD_BL_GPIO_NUM GET_PIN(D, 13)
/* FanKe 4.3 inch screen, 800 * 480 */
#endif /* __LCD_PORT_H__ */
步骤6：配置RT-Thread Setting，内核-> 内存管理
注意：使能动态内存根据需要进行修改，否则会出现[E/drv.lcd] init frame buffer failed!”错误
步骤7：下载，运行，输入lcd_test屏幕按照红、绿、蓝闪烁
原作者：博洛克
