使用stm32f103c8t6单片机产生250Hz定时器中断，中断服务函数内采集ADC三个通道的值并发送串口，cubemx代码

好的，下面是使用stm32f103c8t6单片机产生250Hz定时器中断，中断服务函数内采集ADC三个通道的值并发送串口的cubemx代码：

1. 首先，在cubemx中配置GPIO口，将ADC的输入通道连接到对应的GPIO口上。

2. 配置ADC，设置采样时间、分辨率等参数。

3. 配置定时器，设置定时器的时钟源、预分频、计数器周期等参数，使得定时器的中断频率为250Hz。

4. 在中断服务函数中，首先清除中断标志位，然后读取ADC的三个通道的值，并将其转换为字符串，最后通过串口发送出去。

下面是代码：

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f1xx_hal.h"

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
TIM_HandleTypeDef htim2;
UART_HandleTypeDef huart1;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ADC1_Init(void);
static void MX_TIM2_Init(void);
static void MX_USART1_UART_Init(void);

/* Private variables ---------------------------------------------------------*/
uint16_t adc_buf[3]; // ADC采集结果缓存

/* Private function prototypes -----------------------------------------------*/
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
  if (htim->Instance == TIM2) {
    // 定时器中断服务函数
    HAL_ADC_Start(&hadc1); // 启动ADC转换
    for (int i = 0; i < 3; i++) {
      HAL_ADC_PollForConversion(&hadc1, 100); // 等待转换完成
      adc_buf[i] = HAL_ADC_GetValue(&hadc1); // 读取转换结果
    }
    char str[30];
    sprintf(str, "ADC1=%d, ADC2=%d, ADC3=%d\n", adc_buf[0], adc_buf[1], adc_buf[2]);
    HAL_UART_Transmit(&huart1, (uint8_t *)str, strlen(str), 1000); // 发送串口数据
  }
}

int main(void) {
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_TIM2_Init();
  MX_USART1_UART_Init();
  HAL_TIM_Base_Start_IT(&htim2); // 启动定时器
  while (1) {
  }
}

/* ADC1 init function */
static void MX_ADC1_Init(void) {
  ADC_ChannelConfTypeDef sConfig = {0};
  hadc1.Instance = ADC1;
  hadc1.Init.ScanConvMode = ENABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 3;
  if (HAL_ADC_Init(&hadc1) != HAL_OK) {
    Error_Handler();
  }
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.SamplingTime = ADC_SAMPLETIME_71CYCLES_5;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
    Error_Handler();
  }
  sConfig.Rank = ADC_REGULAR_RANK_2;
  sConfig.Channel = ADC_CHANNEL_1;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
    Error_Handler();
  }
  sConfig.Rank = ADC_REGULAR_RANK_3;
  sConfig.Channel = ADC_CHANNEL_2;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
    Error_Handler();
  }
}

/* TIM2 init function */
static void MX_TIM2_Init(void) {
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 72 - 1;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 288 - 1;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  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();
  }
}

/* USART1 init function */
static void MX_USART1_UART_Init(void) {
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart1) != HAL_OK) {
    Error_Handler();
  }
}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void) {
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void Error_Handler(void) {
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1) {
  }
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void) {
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  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_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
    Error_Handler();
  }
}

注意事项：

1. 以上代码仅供参考，具体实现还需要根据实际情况进行调整。

2. 在使用HAL库的时候，需要将"HAL_ADC_Start()"和"HAL_ADC_PollForConversion()"函数的参数设置为一个比较大的值，以确保ADC转换完成。

3. 如果使用其他的单片机型号，需要根据实际情况进行相应的修改。