用STM32F103的ADC采样并显示的程序

以下是用STM32F103的ADC采样并显示的程序，包括初始化ADC、GPIO和定时器，以及采样和显示函数：

#include "stm32f10x.h"

#define ADC1_DR_Address    ((uint32_t)0x4001244C)

uint16_t ADC_Value = 0;
uint16_t ADC_Average = 0;

void ADC_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); 
  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void ADC_Config(void)
{
  ADC_InitTypeDef ADC_InitStructure;
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); 
  
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);
  
  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);
  
  ADC_Cmd(ADC1, ENABLE);
  
  ADC_ResetCalibration(ADC1);
  while(ADC_GetResetCalibrationStatus(ADC1));
  
  ADC_StartCalibration(ADC1);
  while(ADC_GetCalibrationStatus(ADC1));
  
  ADC_Cmd(ADC1, ENABLE);
  
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

void TIM_Config(void)
{
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  
  TIM_TimeBaseStructure.TIM_Period = 999;
  TIM_TimeBaseStructure.TIM_Prescaler = 7199;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  
  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
  
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  TIM_Cmd(TIM2, ENABLE);
}

void TIM2_IRQHandler(void)
{
  if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
  {
    ADC_Value = ADC_GetConversionValue(ADC1);
    ADC_Average = (ADC_Average + ADC_Value) / 2;
    
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
  }
}

void LED_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void LED_ON(void)
{
  GPIO_WriteBit(GPIOC, GPIO_Pin_13, Bit_RESET);
}

void LED_OFF(void)
{
  GPIO_WriteBit(GPIOC, GPIO_Pin_13, Bit_SET);
}

int main(void)
{
  ADC_GPIO_Config();
  ADC_Config();
  TIM_Config();
  LED_GPIO_Config();
  
  while(1)
  {
    if(ADC_Average > 2048)
    {
      LED_ON();
    }
    else
    {
      LED_OFF();
    }
  }
}

在这个程序中，首先进行了ADC、GPIO和定时器的初始化。其中，ADC采用的是单通道、连续转换模式，并启用了软件触发转换；GPIO使用的是模拟输入模式；定时器使用的是时基模式，定时周期为100ms。在定时器中断中，读取ADC采样值并计算平均值，然后在主循环中判断平均值是否大于2048，从而控制LED的开关状态。