TIM通用定时器-PWM

一、PWM原理

PWM应用：呼吸灯、直流电机、舵机

PWM代码：

//初始化 timer2的pwm输出参数
//psr:预分频
//arr:自动重装载
//pulse:捕获/比较
void timer2_pwm_init(uint16_t psr,uint16_t arr,uint16_t pulse)
{
    timer_parameter_struct timer_init_struct;
    timer_oc_parameter_struct timer_oc_init_struct;

    //时钟源和io口PB0的初始化
    rcu_periph_clock_enable(RCU_TIMER2);//开启定时器的时钟
    rcu_periph_clock_enable(GPIOB);
    rcu_periph_clock_enable(RCU_AF);//复用

    gpio_init(GPIOB,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_0);

    //初始化timer2
    timer_deinit(TIMER2);
    timer_init_struct.prescaler = psr;
    timer_init_struct.period = arr; //自动装载值
    timer_init_struct.alignedmode = TIMER_COUNTER_EDGE; //边沿对齐
    timer_init_struct.counterdirection = TIMER_COUNTER_UP;//计数方向

    //PWM的初始化
   timer_oc_init_struct.outputstate = TIMER_CCX_ENABLE;//使能通道
   timer_channel_output_config(TIMER2,TIMER_CH_2,&timer_oc_init_struct););
   
   timer_channel_output_mode_config(TIMER2,TIMER_CH2,TIMER_OC_MODE_PWM);

   //使能timer2
  timer_enable(TIMER2）；

} 

//功能：调整PWM的占空比
//duty:捕获/比较
void timer2_pwm_duty_set(uint16_t duty)
{
    timer_channel_output_pulse_value_config(TIMER2,TIME_CH_2,duty);
}