stm32 ltdc 画曲线完整代码

以下是在STM32上使用LTDC画曲线的完整代码示例。需要注意的是，此代码示例仅提供了基本的曲线绘制功能，您需要根据具体需求进行适当修改。

#include "stm32f4xx.h"
#include "stm32f429i_discovery.h"

// 定义LCD分辨率
#define LCD_WIDTH  480
#define LCD_HEIGHT 272

// 定义LTDC配置参数
static LTDC_HandleTypeDef hltdc;
static uint32_t LcdLayerCfg;

// 定义曲线参数
#define MAX_POINTS 100
static uint16_t x_points[MAX_POINTS];
static uint16_t y_points[MAX_POINTS];
static uint16_t num_points = 0;

// 初始化LTDC
void LTDC_Init(void) {
  // 启用LTDC时钟
  __HAL_RCC_LTDC_CLK_ENABLE();

  // 配置LTDC时序和时钟参数
  hltdc.Init.HorizontalSync = LCD_HSYNC - 1;
  hltdc.Init.VerticalSync = LCD_VSYNC - 1;
  hltdc.Init.AccumulatedHBP = LCD_HSYNC + LCD_HBP - 1;
  hltdc.Init.AccumulatedVBP = LCD_VSYNC + LCD_VBP - 1;
  hltdc.Init.AccumulatedActiveW = LCD_HSYNC + LCD_WIDTH + LCD_HBP - 1;
  hltdc.Init.AccumulatedActiveH = LCD_VSYNC + LCD_HEIGHT + LCD_VBP - 1;
  hltdc.Init.TotalWidth = LCD_HSYNC + LCD_WIDTH + LCD_HBP + LCD_HFP - 1;
  hltdc.Init.TotalHeigh = LCD_VSYNC + LCD_HEIGHT + LCD_VBP + LCD_VFP - 1;

  // 配置LTDC时钟参数
  hltdc.Init.ClockSuorce = LTDC_CLOCK_SYNC;
  hltdc.Init.ClockPolarity = LTDC_CLK_POLARITY_FALLING;
  hltdc.Init.ClockDiv = 5;
  hltdc.Init.HSPolarity = LTDC_HSPOLARITY_AL;
  hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AL;
  hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
  hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;

  // 初始化LTDC
  hltdc.Instance = LTDC;
  HAL_LTDC_Init(&hltdc);

  // 配置LTDC层参数
  LTDC_LayerCfgTypeDef LayerCfg;
  LayerCfg.WindowX0 = 0;
  LayerCfg.WindowX1 = LCD_WIDTH;
  LayerCfg.WindowY0 = 0;
  LayerCfg.WindowY1 = LCD_HEIGHT;
  LayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_ARGB8888;
  LayerCfg.Alpha = 255;
  LayerCfg.Alpha0 = 0;
  LayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
  LayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
  LayerCfg.FBStartAdress = LCD_FRAME_BUFFER;
  LayerCfg.ImageWidth = LCD_WIDTH;
  LayerCfg.ImageHeight = LCD_HEIGHT;
  LayerCfg.Backcolor.Red = 0;
  LayerCfg.Backcolor.Green = 0;
  LayerCfg.Backcolor.Blue = 0;

  // 配置LTDC Layer
  HAL_LTDC_ConfigLayer(&hltdc, &LayerCfg, 0);

  // 使能LTDC
  HAL_LTDC_Enable(&hltdc);
}

// 画曲线
void draw_curve(void) {
  uint16_t i;
  uint16_t x, y;

  // 清空屏幕
  for (i = 0; i < LCD_WIDTH * LCD_HEIGHT; i++) {
    ((uint32_t*)LCD_FRAME_BUFFER)[i] = 0;
  }

  // 画坐标轴
  for (i = 0; i < LCD_WIDTH; i++) {
    ((uint32_t*)LCD_FRAME_BUFFER)[i + (LCD_HEIGHT / 2) * LCD_WIDTH] = 0xFFFFFFFF;
  }
  for (i = 0; i < LCD_HEIGHT; i++) {
    ((uint32_t*)LCD_FRAME_BUFFER)[(LCD_WIDTH / 2) + i * LCD_WIDTH] = 0xFFFFFFFF;
  }

  // 画曲线
  for (i = 0; i < num_points - 1; i++) {
    x = x_points[i] + (LCD_WIDTH / 2);
    y = (LCD_HEIGHT / 2) - y_points[i];
    ((uint32_t*)LCD_FRAME_BUFFER)[y * LCD_WIDTH + x] = 0xFFFFFFFF;
  }
}

// 添加点
void add_point(uint16_t x, uint16_t y) {
  if (num_points < MAX_POINTS) {
    x_points[num_points] = x;
    y_points[num_points] = y;
    num_points++;
  }
}

// 主函数
int main(void) {
  // 初始化LTDC
  LTDC_Init();

  // 添加曲线点
  add_point(0, 0);
  add_point(10, 10);
  add_point(20, 20);
  add_point(30, 30);

  // 画曲线
  draw_curve();

  // 循环
  while(1) {
    // ...
  }
}

以上代码示例中，我们添加了一个`add_point`函数来添加曲线上的点，以及一个`draw_curve`函数来画曲线。在主函数中，我们添加了一些曲线点并画出了曲线。您可以根据需要修改这些函数，以适应不同的曲线绘制需求。