写一个基于hal库的stm32f407zgt6的adc读取音频电压信号10s，存到内部flash并且通过dac输出的代码

好的，以下是基于HAL库的STM32F407ZGT6的ADC读取音频电压信号10s并存储到内部flash并通过DAC输出的代码：

#include "main.h"
#include "stm32f4xx_hal.h"

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
DAC_HandleTypeDef hdac;
TIM_HandleTypeDef htim6;
uint32_t adc_value[10000]; //存储ADC值的数组，长度要足够存储10s的数据
uint32_t write_address = 0x080E0000; //内部flash写入的起始地址

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ADC1_Init(void);
static void MX_DAC_Init(void);
static void MX_TIM6_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_DAC_Init();
  MX_TIM6_Init();

  HAL_ADC_Start(&hadc1); //启动ADC
  HAL_TIM_Base_Start_IT(&htim6); //启动定时器，每1ms触发一次中断

  while (1)
  {
    //等待10s
  }
}

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  if (htim->Instance == TIM6)
  {
    adc_value[write_address - 0x080E0000] = HAL_ADC_GetValue(&hadc1); //读取ADC值并存储到数组中
    write_address += 4; //每次存储4个字节，即一个ADC值
    if (write_address >= 0x080FFFFF) //如果存储到了内部flash的结束地址
    {
      HAL_TIM_Base_Stop_IT(&htim6); //停止定时器
      HAL_ADC_Stop(&hadc1); //停止ADC
      HAL_DAC_Start(&hdac, DAC_CHANNEL_1); //启动DAC
      for (int i = 0; i < 10000; i++) //循环输出ADC值
      {
        HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, adc_value[i]); //输出DAC值
        HAL_Delay(1); //等待1ms
      }
      while (1); //程序结束
    }
  }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 168;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |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;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};

  __HAL_RCC_ADC1_CLK_ENABLE();

  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.NbrOfDiscConversion = 0;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DMAContinuousRequests = DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }
  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
  sConfig.SamplingTime = ADC_SAMPLETIME_480CYCLES;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

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

  __HAL_RCC_DAC_CLK_ENABLE();

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

static void MX_TIM6_Init(void)
{
  __HAL_RCC_TIM6_CLK_ENABLE();

  htim6.Instance = TIM6;
  htim6.Init.Prescaler = 8399;
  htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim6.Init.Period = 999;
  htim6.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  if (HAL_TIM_Base_Init(&htim6) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  __HAL_RCC_GPIOC_CLK_ENABLE();

  GPIO_InitStruct.Pin = GPIO_PIN_0;
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  __HAL_RCC_GPIOD_CLK_ENABLE();

  GPIO_InitStruct.Pin = GPIO_PIN_4;
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
}

void Error_Handler(void)
{
  while(1);
}

顺便解释一下代码的大致流程：

1. 初始化ADC、DAC和定时器；
2. 启动ADC和定时器；
3. 定时器每1ms触发一次中断，读取ADC值并存储到数组中；
4. 当存储到了内部flash的结束地址时，停止ADC和定时器，启动DAC，循环输出ADC值。

需要注意的是，这段代码写入内部flash的起始地址为0x080E0000，结束地址为0x080FFFFF。如果你的程序已经使用了内部flash的一部分空间，需要修改起始地址。同时，由于每个ADC值占用4个字节，所以存储10s的数据需要一个足够大的数组，我这里定义的数组长度是10000，也就是约为每秒1000个ADC值，如果需要更高的采样率，需要相应地增加数组长度。