GD32F330 如何动态调节PWM频率？

只看该作者 · 2020-7-13 10:44

测试了很多种方法还是不行，代码如下

rcu_periph_clock_enable(RCU_TIMER2);

timer_deinit(TIMER2);

timer_initpara.prescaler       = 9;

timer_initpara.alignedmode    = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection  = TIMER_COUNTER_UP;
timer_initpara.period          = 4000;                                  //频率值
timer_initpara.clockdivision    = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER2,&timer_initpara);

   /* CH1 configuration in PWM mode */
timer_ocintpara.outputstate  = TIMER_CCX_ENABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;

timer_channel_output_config(TIMER2,TIMER_CH_1,&timer_ocintpara);

timer_channel_output_pulse_value_config(TIMER2,TIMER_CH_1,2000);  //占空比值
timer_channel_output_mode_config(TIMER2,TIMER_CH_1,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER2,TIMER_CH_1,TIMER_OC_SHADOW_DISABLE);

timer_primary_output_config(TIMER2,ENABLE);

timer_enable(TIMER2);

调节占空比是比较简单， timer_channel_output_pulse_value_config(TIMER2,TIMER_CH_1,PWM);  //占空比值赋值到PWM然后调节PWM值就行了，但是频率值是不行的，
我把频率值赋值后发现调不了，大家帮我看一下咋回事，因为我调节范围比较小，所以没有去调分频之类的，那样的话调节一下频率就会变化很多，