各位朋友大家好,我在使用gd32f30x的外部上升沿触发timer1_singlepulse模式时,出现timer1 ch2的pwm输出不规则的问题:
1.应用情况:外部触发频率:100kHz,输出pwm频率:100kHz,占空比3/20.
2.波形:蓝色:外部触发源 紫色:timer1 ch2输出pwm
3.配置代码:
timer_initpara.prescaler = 83;
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 19;
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER1,&timer_initpara);
/* auto-reload preload disable */
timer_auto_reload_shadow_disable(TIMER1);
/* CH2 configuration in OC PWM0 mode */
timer_ocinitpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocinitpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH;
timer_ocinitpara.outputstate = TIMER_CCX_ENABLE;
timer_ocinitpara.outputnstate = TIMER_CCXN_DISABLE;
timer_ocinitpara.ocidlestate = TIMER_OC_IDLE_STATE_LOW;
timer_ocinitpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
timer_channel_output_config(TIMER1,TIMER_CH_2,&timer_ocinitpara);
timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_2,3);
timer_channel_output_mode_config(TIMER1,TIMER_CH_2,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER1,TIMER_CH_2,TIMER_OC_SHADOW_DISABLE);
timer_channel_output_fast_config(TIMER1,TIMER_CH_2,TIMER_OC_FAST_ENABLE);
/* TIMER1 CH0 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 = 0x00;
timer_input_capture_config(TIMER1,TIMER_CH_0,&timer_icinitpara);
/* single pulse mode selection */
timer_single_pulse_mode_config(TIMER1,TIMER_SP_MODE_SINGLE);
/* slave mode selection : TIMER1 */
/* TIMER1 input trigger : external trigger connected to CI0 */
timer_input_trigger_source_select(TIMER1,TIMER_SMCFG_TRGSEL_CI0FE0);
timer_slave_mode_select(TIMER1,TIMER_SLAVE_MODE_EVENT);
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