GD32F303RCT6-TIMER2-CH2无法进行PWM频率捕获

只看该作者 · 2022-12-12 15:14

硬件初始化：
         rcu_periph_clock_enable(RCU_GPIOB);
         rcu_periph_clock_enable(RCU_TIMER2);
         rcu_periph_clock_enable(RCU_AF);

         gpio_init(GPIOC, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_8);
         gpio_pin_remap_config(GPIO_TIMER2_FULL_REMAP, ENABLE);//PC8 FULL Remap

         timer_deinit(TIMER2);
         /* initialize TIMER init parameter struct */
         timer_struct_para_init(&timer_initpara);

         /* TIMER2 configuration */
         timer_initpara.prescaler       = 0;
         timer_initpara.alignedmode    = TIMER_COUNTER_EDGE;
         timer_initpara.counterdirection  = TIMER_COUNTER_UP;
         timer_initpara.period          = 65535;
         timer_initpara.clockdivision    = TIMER_CKDIV_DIV1;
         timer_initpara.repetitioncounter = 0;
         timer_init(TIMER2, &timer_initpara);

         /* TIMER2 configuration */
         /* TIMER2 CH2 PWM input capture configuration */
         timer_icinitpara.icpolarity  = TIMER_IC_POLARITY_RISING;
         timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
         timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
         timer_icinitpara.icfilter = 0;
         //timer_input_pwm_capture_config(TIMER2, TIMER_CH_2, &timer_icinitpara);
         timer_input_capture_config(TIMER2, TIMER_CH_2, &timer_icinitpara);

         /* slave mode selection: TIMER2 */
         timer_input_trigger_source_select(TIMER2, TIMER_SMCFG_TRGSEL_CI1FE1);
         timer_slave_mode_select(TIMER2, TIMER_SLAVE_MODE_RESTART);

         /* select the master slave mode */
         timer_master_slave_mode_config(TIMER2, TIMER_MASTER_SLAVE_MODE_ENABLE);

         /* auto-reload preload enable */
         timer_auto_reload_shadow_enable(TIMER2);
         /* clear channel 2 interrupt bit */
         timer_interrupt_flag_clear(TIMER2, TIMER_INT_FLAG_CH2);
         /* channel 2 interrupt enable */
         timer_interrupt_enable(TIMER2, TIMER_INT_CH2);

         /* TIMER2 counter enable */
         timer_enable(TIMER2);

中断函数：

void TIMER2_IRQHandler(void)
{
if(SET == timer_interrupt_flag_get(TIMER2, TIMER_INT_FLAG_CH2))
{
      /* clear channel 1 interrupt bit */
      timer_interrupt_flag_clear(TIMER2, TIMER_INT_FLAG_CH2);
      /* read channel 1 capture value */
      ic1valueW[0] = timer_channel_capture_value_register_read(TIMER2, TIMER_CH_2) + 1;

      if(0 != ic1valueW[0])
      {
         /* read channel 1 capture value */
         ic2valueW[0] = timer_channel_capture_value_register_read(TIMER2, TIMER_CH_2)+1;

         /* calculate the duty cycle value */
         dutycycleW[0] = (ic2valueW[0] * 100) / ic1valueW[0];
         /* calculate the frequency value */
         frequencyW[0] = 1000000 / ic1valueW[0];
      }
      else
      {
         dutycycleW[0] = 0;
         frequencyW[0] = 0;
      }
}

硬件没有问题，MCU的IO口有真实的PWM波形，但是中断没有触发
各路大神，跪求指点找出问题在哪里