STMM32F103PWM输出

bcwx

各定时器对应通道

TIM1_CH1->PA8;
TIM1_CH2->PA9;
TIM1_CH3->PA10;
TIM1_CH4->PA11;

TIM2_CH1->PA0;
TIM2_CH2->PA1;
TIM2_CH3->PA2;
TIM2_CH4->PA3;

TIM3_CH1->PA6;
TIM3_CH2->PA7;
TIM3_CH3->PB0;
TIM3_CH4->PB1;

TIM4_CH1->PB6;
TIM4_CH2->PB7;
TIM4_CH3->PB8;
TIM4_CH4->PB9;


以下是TIM4通道3输出PWM的代码

void TIM4_CH3_Init(u16 arr,u16 psc)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;
   

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);    //使能定时器3时钟
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB| RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟
   
//    GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //Timer3部分重映射   

   //设置该引脚为复用输出功能,输出TIM3 CH1的PWM脉冲波形    GPIOB.4
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH1
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO

   //初始化TIM3
    TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
    TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

   
    //初始化TIM3 Channel2 PWM模式     
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
     TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性高
   
    TIM_OC3Init(TIM4, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC1
    TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);  //使能TIM3在CCR1上的预装载寄存器

//    TIM_Cmd(TIM4, ENABLE);  //使能TIM4


}

u32 Git_TIME_Arr(u8 psc,u32 hz)
{
            RCC_ClocksTypeDef get_rcc_clock;
            RCC_GetClocksFreq(&get_rcc_clock);
            return get_rcc_clock.SYSCLK_Frequency/(psc+1)/hz;
}
u16 Git_TIME_DutyCycle(u8 psc,u32 hz,float DutyCycle)
{
            return (Git_TIME_Arr(psc,hz)/100.0)*DutyCycle;
}


直接调用下面3段即可输出PWM
#define TIM2_hz 40000                //频率
#define TIM2_psc 0                    //分频
#define TIM2_DutyCycle    50.0        //占空比


TIM4_CH3_Init(Git_TIME_Arr(TIM2_psc,TIM2_hz),TIM2_psc);
    TIM_SetCompare3(TIM4,Git_TIME_DutyCycle(TIM2_psc,TIM2_hz,TIM2_DutyCycle));    //占空比设置成50%
    TIM_Cmd(TIM4, ENABLE);  //使能TIM4