stm32f103c8t6使用TIM3产生pwm并且设置定时中断

要使用TIM3产生PWM并设置定时中断，您需要执行以下步骤：

1. 启用TIM3时钟：

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

2. 配置TIM3为PWM模式：

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 999;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);

3. 设置PWM的占空比：

TIM_SetCompare1(TIM3, 500); //设置为50%的占空比

4. 启用TIM3的定时中断：

TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

5. 在定时中断服务程序中处理中断：

void TIM3_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
    {
        //处理定时中断
        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    }
}

完成以上步骤后，您的STM32F103C8T6将产生PWM并设置定时中断。