利用stm32f103c8t6单片机编写AD采样控制PWM输出调速的代码

好的，以下是一个基于STM32F103C8T6单片机的AD采样控制PWM输出调速的代码示例。本例程使用PA0作为AD采样输入，通过TIM2控制PA6输出PWM信号。

#include "stm32f10x.h"

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    ADC_InitTypeDef ADC_InitStructure;

    //使能GPIOA和TIM2的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_TIM1 | RCC_APB2Periph_ADC1, ENABLE);

    //设置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);

    //设置TIM2的计数模式和分频系数
    TIM_TimeBaseStructure.TIM_Period = 999;
    TIM_TimeBaseStructure.TIM_Prescaler = 71;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    //设置TIM2的PWM模式和输出通道
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 500;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);

    //设置ADC1的采样模式和通道
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    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);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);

    //使能ADC1和TIM2
    ADC_Cmd(ADC1, ENABLE);
    TIM_Cmd(TIM2, ENABLE);

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

        //等待转换完成
        while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);

        //获取转换结果并更新PWM占空比
        TIM_SetCompare1(TIM2, ADC_GetConversionValue(ADC1));
    }
}

以上代码仅供参考，实际使用时还需要根据具体情况进行适当的修改和调整。