GD32F350定时器14属于通用定时器L3，GD32F350定时器2属于通用定时器L0，没有PWM输出，是由于没有配置：timer_primary_output_config(TIMER14,ENABLE);，详细代码如下：
timer_oc_parameter_struct timer_ocintpara;
timer_parameter_struct timer_initpara;
rcu_periph_clock_enable(RCU_TIMER14);
timer_deinit(TIMER14);
/* TIMER1 configuration */
#ifdef GD32F330
timer_initpara.prescaler = 83;
#endif /* GD32F330 */
#ifdef GD32F350
timer_initpara.prescaler = 107;
#endif /* GD32F350 */
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 15999;
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER14,&timer_initpara);
/* CH1,CH2 and CH3 configuration in PWM mode */
timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
timer_ocintpara.outputnstate = TIMER_CCXN_DISABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH;
timer_ocintpara.ocidlestate = TIMER_OC_IDLE_STATE_LOW;
timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
timer_channel_output_config(TIMER14,TIMER_CH_0,&timer_ocintpara);
timer_channel_output_config(TIMER14,TIMER_CH_1,&timer_ocintpara);
// timer_channel_output_config(TIMER14,TIMER_CH_3,&timer_ocintpara);
timer_channel_output_pulse_value_config(TIMER14,TIMER_CH_0,3999);
timer_channel_output_mode_config(TIMER14,TIMER_CH_0,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER14,TIMER_CH_0,TIMER_OC_SHADOW_DISABLE);
timer_channel_output_pulse_value_config(TIMER14,TIMER_CH_1,7999);
timer_channel_output_mode_config(TIMER14,TIMER_CH_1,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER14,TIMER_CH_1,TIMER_OC_SHADOW_DISABLE);
timer_primary_output_config(TIMER14,ENABLE);
/* auto-reload preload enable */
timer_auto_reload_shadow_enable(TIMER14);
/* auto-reload preload enable */
timer_enable(TIMER14);
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