苇叶 发表于 2022-12-29 10:52

关于GD32F303定时器Timer8输出PWM问题

我想使用PE5输出PWM，复用Timer8 ch0,根据例程修改定时器后，一直无法输出，代码如下，请大神指导！！！
//PE5复用Timer8 ch0
    timer_oc_parameter_struct timer_ocintpara;
    timer_parameter_struct timer_initpara;
                rcu_periph_clock_enable(RCU_AF);
                rcu_periph_clock_enable(RCU_GPIOE);
    gpio_pin_remap_config(GPIO_TIMER8_REMAP,ENABLE);
               
    /*Configure PE5(TIMER8_CH0) as alternate function*/
    gpio_init(GPIOE, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5);
               
    rcu_periph_clock_enable(RCU_TIMER8);
    timer_deinit(TIMER8);

    /* TIMER8 configuration */
    timer_initpara.prescaler         = 108;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection= TIMER_COUNTER_UP;
    timer_initpara.period            = 500;
    timer_initpara.clockdivision   = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER8,&timer_initpara);

   /* CH0 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(TIMER8,TIMER_CH_0,&timer_ocintpara);

    timer_channel_output_pulse_value_config(TIMER8,TIMER_CH_0,250);
    timer_channel_output_mode_config(TIMER8,TIMER_CH_0,TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER8,TIMER_CH_0,TIMER_OC_SHADOW_DISABLE);

    timer_primary_output_config(TIMER8,ENABLE);
    /* auto-reload preload enable */
    timer_auto_reload_shadow_enable(TIMER8);
    timer_enable(TIMER8);

raw120 发表于 2023-4-3 11:12

楼主解决了么，最近我也遇到这个问题

美芯微半导体liu 发表于 2023-4-3 18:53

我是GD原厂代理有需要和有需要可以交流合作13242085214研发遇到任何问题我们提供技术帮助

sagade 发表于 2023-4-4 07:24

不会是没有TIMER8的303吧？

lmksz 发表于 2025-7-30 17:04

我也发现类似问题，查到库函数timer_init 就没有对timer8进行处理， 见：
void timer_init(uint32_t timer_periph, timer_parameter_struct* initpara)
{
    /* configure the counter prescaler value */
    TIMER_PSC(timer_periph) = (uint16_t)initpara->prescaler;

    /* configure the counter direction and aligned mode */
    if((TIMER0 == timer_periph) || (TIMER1 == timer_periph) || (TIMER2 == timer_periph)
      || (TIMER3 == timer_periph) || (TIMER4 == timer_periph) || (TIMER7 == timer_periph)){
      TIMER_CTL0(timer_periph) &= ~(uint32_t)(TIMER_CTL0_DIR|TIMER_CTL0_CAM);
      TIMER_CTL0(timer_periph) |= (uint32_t)initpara->alignedmode;
      TIMER_CTL0(timer_periph) |= (uint32_t)initpara->counterdirection;
    }

    /* configure the autoreload value */
    TIMER_CAR(timer_periph) = (uint32_t)initpara->period;

    if((TIMER5 != timer_periph) && (TIMER6 != timer_periph)){
      /* reset the CKDIV bit */
      TIMER_CTL0(timer_periph) &= ~(uint32_t)TIMER_CTL0_CKDIV;
      TIMER_CTL0(timer_periph) |= (uint32_t)initpara->clockdivision;
    }

    if((TIMER0 == timer_periph) || (TIMER7 == timer_periph)){
      /* configure the repetition counter value */
      TIMER_CREP(timer_periph) = (uint32_t)initpara->repetitioncounter;
    }

    /* generate an update event */
    TIMER_SWEVG(timer_periph) |= (uint32_t)TIMER_SWEVG_UPG;
}

onlycook 发表于 2025-7-31 16:22

重映射配置是否正确？PIO_TIMER8_REMAP可能未正确启用。

flycamelaaa 发表于 2025-7-31 16:23

gpio_pin_remap_config(GPIO_TIMER8_REMAP, ENABLE)可能未生效。

powerantone 发表于 2025-7-31 16:23

timer_init()函数可能未完全配置TIMER8。

stormwind123 发表于 2025-7-31 16:23

TIMER_OC_MODE_PWM0模式需配合极性和预装载。

probedog 发表于 2025-7-31 16:24

重映射冲突或者时钟未启用。

lmksz 发表于 2025-8-1 09:01

经各位大佬提醒， 确实是Timer8_CH1@PE6重定位忘了写了， 加上后， timer8初始化正常！看来不是库函数timer_init()的问题。现在的问题是timer11_CH0（@PB15）也使用了类似的设置， 无重定位要求， 但还无法使用， 检查中。
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