使用stm32写一个波形发生器，包括正弦波、方波、三角波，频率范围为0.1kHz～10kHz，峰峰值范围为0.1Vpp～10Vpp。代码如何写

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以下是使用STM32实现波形发生器的步骤和代码示例：

1.配置TIM（定时器）模块，选择合适的时钟源，并设置计数器的重载值和分频系数，以实现所需的输出频率；

TIM_HandleTypeDef htim2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();

  MX_GPIO_Init();
  MX_TIM2_Init();
  
  HAL_TIM_Base_Start(&htim2);
  
  while (1)
  {
  }
}

void MX_TIM2_Init(void)
{
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 1000;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

2.编写波形生成函数，根据所选波形类型和参数，生成对应的波形信号；

#define PI 3.14159265358979323846

float32_t sin_wave(float32_t frequency, float32_t amplitude, float32_t time)
{
    return amplitude * sin(2 * PI * frequency * time);
}

float32_t square_wave(float32_t frequency, float32_t amplitude, float32_t time)
{
    return amplitude * (2 * ((int)(2 * frequency * time) % 2) - 1);
}

float32_t triangle_wave(float32_t frequency, float32_t amplitude, float32_t time)
{
    return amplitude * (2 * fabs(2 * frequency * time - 2 * floor(0.5 + 2 * frequency * time)) - 1);
}

3.在定时器中断中调用波形生成函数，将生成的波形信号输出到DAC（数模转换器）模块；

#define DAC_BUF_SIZE 256
#define SAMPLE_RATE 100000

float32_t sin_buf[DAC_BUF_SIZE];
float32_t square_buf[DAC_BUF_SIZE];
float32_t triangle_buf[DAC_BUF_SIZE];

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    static uint16_t index = 0;
    static uint16_t wave_type = 0;
    static float32_t frequency = 1000;
    static float32_t amplitude = 2047;

    switch (wave_type)
    {
    case 0: // 正弦波
        DAC_SetValue(sin_wave(frequency, amplitude, index * 1.0 / SAMPLE_RATE));
        break;
    case 1: // 方波
        DAC_SetValue(square_wave(frequency, amplitude, index * 1.0 / SAMPLE_RATE));
        break;
    case 2: // 三角波
        DAC_SetValue(triangle_wave(frequency, amplitude, index * 1.0 / SAMPLE_RATE));
        break;
    default:
        break;
    }

    index++;
    if (index >= DAC_BUF_SIZE)
    {
        index = 0;
    }
}

void DAC_SetValue(float32_t value)
{
    uint16_t output = (uint16_t)(value + 2048);
    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, output);
}

4.配置DAC（数模转换器）模块，将波形信号输出到外部电路中。

DAC_HandleTypeDef hdac;

void MX_DAC_Init(void)
{
  DAC_ChannelConfTypeDef sConfig = {0};

  hdac.Instance = DAC;
  if (HAL_DAC_Init(&hdac) != HAL_OK)
  {
    Error_Handler();
  }
  sConfig.DAC_Trigger = DAC_TRIGGER_T2_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
  if (HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
}

希望这个回答能够帮到您，如有疑问请继续提问。