用stm32f103c8t6的定时器3的3个通道输出3路pwm 并且可通过按键分别调节三路pwm波的 相位

和占空比，该如何实现？

您可以按照以下步骤实现：

1. 初始化定时器3

2. 配置定时器3的3个通道为PWM输出模式

3. 配置按键的GPIO口为输入模式

4. 通过中断方式检测按键状态，并根据按键状态改变相应PWM波的相位和占空比

5. 在主循环中循环输出3路PWM波

下面是一个简单的代码框架，供您参考：

#include "stm32f10x.h"

void TIM3_PWM_Init(void){
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //使能 PORTA 及复用功能时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能 定时器 TIM3 时钟

    //初始化 GPIO
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8; //PA6, PA7, PA8
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //初始化 TIM3
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.TIM_Period = 199; //PWM信号频率 = 72M / (199 + 1) / 100 = 360Hz
    TIM_TimeBaseStructure.TIM_Prescaler = 359; //定时器3预分频值
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频因子
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器向上计数
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    //初始化 TIM3 Channel 1/2/3 PWM 输出
    TIM_OCStructInit(&TIM_OCInitStructure);
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0; //占空比 = 0%
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM3, &TIM_OCInitStructure);
    TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);
    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
    TIM_OC3Init(TIM3, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

    //启动 TIM3 定时器
    TIM_Cmd(TIM3, ENABLE);
}

int main(void)
{
    TIM3_PWM_Init();

    while(1)
    {
        //循环输出3路PWM波
    }

    return 0;
}

//中断服务函数，负责处理按键状态变化
void EXTI9_5_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line5) != RESET) //检测按键5状态
    {
        //更改对应PWM波的相位和占空比
        EXTI_ClearITPendingBit(EXTI_Line5); //清除中断标志位
    }
}