编写stm32f103c8t6利用AD采集电压信号并通过串口输出的程序

好的，这是一个简单的示例程序，可以帮助你了解如何在STM32F103C8T6上使用ADC和USART：

#include "stm32f10x.h"

void RCC_Configuration(void)
{
  // 打开GPIOA、USART1和ADC1的时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1 | RCC_APB2Periph_USART1, ENABLE);
  // 打开ADC1的DMA时钟
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  // 配置PA0为模拟输入
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  // 配置PA9为USART1的TX引脚
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void ADC_Configuration(void)
{
  ADC_InitTypeDef ADC_InitStructure;

  // ADC1配置为单次模式，扫描模式，使用软件触发
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  // 配置ADC1的通道0为采样通道
  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);

  // 启用ADC1
  ADC_Cmd(ADC1, ENABLE);

  // 开始ADC1的校准
  ADC_ResetCalibration(ADC1);
  while (ADC_GetResetCalibrationStatus(ADC1));
  ADC_StartCalibration(ADC1);
  while (ADC_GetCalibrationStatus(ADC1));
}

void USART_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;

  // USART1配置为9600波特率，8位数据位，1位停止位，无校验位
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Tx;
  USART_Init(USART1, &USART_InitStructure);

  // 启用USART1
  USART_Cmd(USART1, ENABLE);
}

void DMA_Configuration(void)
{
  DMA_InitTypeDef DMA_InitStructure;

  // 配置DMA1通道1，从ADC数据寄存器读取数据，传输到USART1的数据寄存器
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART1->DR);
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)(&ADC1->DR);
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 1;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);

  // 启用DMA1通道1
  DMA_Cmd(DMA1_Channel1, ENABLE);
}

int main(void)
{
  RCC_Configuration();
  GPIO_Configuration();
  ADC_Configuration();
  USART_Configuration();
  DMA_Configuration();

  while (1) {
    // 启动ADC转换
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);

    // 等待ADC转换完成
    while (!DMA_GetFlagStatus(DMA1_FLAG_TC1));
    DMA_ClearFlag(DMA1_FLAG_TC1);

    // 将ADC转换结果通过USART发送出去
    uint16_t adc_value = ADC_GetConversionValue(ADC1);
    char str[16];
    sprintf(str, "%d\r\n", adc_value);
    USART_SendData(USART1, (uint16_t)str);
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
  }
}

这个程序会周期性地读取ADC通道0的值，并通过USART1发送出去。你可以在串口调试工具中查看输出的结果。请注意，这个程序仅供参考，你需要根据自己的实际情况进行调整。