GD32F303 定时器计数AB相脉冲计数不准

只看该作者 · 2021-10-29 16:06

本帖最后由 jsrdczy 于 2021-10-29 16:37 编辑

1.配置timer1 为正交译码接收，用来计数AB相脉冲个数。

2.首先将另外两个io口接到tim的ch0和ch1上，手动拉高拉低进行计数测试，按照表中的四种情况进行手动测试1）当ch0低电平，ch1上升下降沿无计数
2）当ch0高电平，ch1上升下降沿计数+1 -1
3）ch1低电平，ch0沿变化+1 -1
4）ch1高电平，ch0沿变化+1 -1
总结：ch0 为低电平时，ch1上升沿下降沿均未计数。其余三种情况计数值正确计数。

初始化代码如下，我试过tim1和tim2，均是此现象
rcu_periph_clock_enable(encoder->per_clk);
rcu_periph_clock_enable(encoder->ch0_clk);
rcu_periph_clock_enable(encoder->ch1_clk);

      /*configture ch0 ch1*/
gpio_init(encoder->ch0_port, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, encoder->ch0_pin);
gpio_init(encoder->ch1_port, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, encoder->ch1_pin);

      /*set irqn and enable*/
      nvic_irq_enable(encoder->encoder_irqn,4U,0U);

      timer_parameter_struct tim_initpara;
                              tim_initpara.prescaler       = 0U;
                              tim_initpara.alignedmode    = TIMER_COUNTER_EDGE;
                              tim_initpara.counterdirection  = TIMER_COUNTER_UP;
                              tim_initpara.period          = 0x7FFF;
                              tim_initpara.clockdivision    = TIMER_CKDIV_DIV1;
                              tim_initpara.repetitioncounter = 0U;
      timer_init(gd32_device->tim_periph,&tim_initpara);

      /*time encoder config*/
                        timer_quadrature_decoder_mode_config(gd32_device->tim_periph,TIMER_ENCODER_MODE2,TIMER_IC_POLARITY_RISING,TIMER_IC_POLARITY_RISING);
                        /*ic config*/
                        ic_initpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
                        ic_initpara.icpolarity = TIMER_IC_POLARITY_RISING;
                        ic_initpara.icprescaler = TIMER_IC_PSC_DIV1;
                        ic_initpara.icfilter = 0;
                        timer_input_capture_config(gd32_device->tim_periph,TIMER_CH_0,&ic_initpara);
                        ic_initpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
                        ic_initpara.icpolarity = TIMER_IC_POLARITY_RISING;
                        ic_initpara.icprescaler = TIMER_IC_PSC_DIV1;
                        ic_initpara.icfilter = 0;
                        timer_input_capture_config(gd32_device->tim_periph,TIMER_CH_1,&ic_initpara);

                        /*clear update flag*/
                        timer_interrupt_flag_clear(gd32_device->tim_periph,TIMER_INT_FLAG_UP);
                        /*update source only cnt overflow*/
      timer_update_source_config(gd32_device->tim_periph,TIMER_UPDATE_SRC_REGULAR);

                        /*update interrupt*/
                        timer_interrupt_enable(gd32_device->tim_periph,TIMER_INT_UP);
                        /*start cnt enable*/
                        timer_enable(gd32_device->tim_periph);

希望有人能一起探探讨下，很迷惑