timer_auto_reload_shadow_enable

timer_auto_reload_shadow_enable是一个函数，用于使能定时器的自动重载影子功能。在该功能启用后，当定时器的计数值达到自动重载值时，会自动将重载值加载到计数器中，实现定时器的自动循环计数。这个函数的具体实现可以参考引用\[1\]中的代码示例。
#### 引用[.reference_title]
- *1* *2* *3* [GD32F103定时器使用内部时钟作为时钟源](https://blog.csdn.net/weixin_42550185/article/details/116531250)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insert_down1,239^v3^insert_chatgpt"}} ] [.reference_item]
[ .reference_list ]

相关问题

void pwm_capture_timer_config(void) { /* TIMER2 configuration: input capture mode ------------------- the external signal is connected to TIMER2 CH0 pin (PB4) the rising edge is used as active edge the TIMER2 CH0CV is used to compute the frequency value ------------------------------------------------------------ */ timer_ic_parameter_struct timer_icinitpara; timer_parameter_struct timer_initpara; rcu_periph_clock_enable(RCU_TIMER0); timer_deinit(TIMER0); /* TIMER1 configuration */ timer_initpara.prescaler = 119; 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(TIMER0,&timer_initpara); /* TIMER1 configuration */ /* TIMER1 CH2 input capture configuration */ timer_icinitpara.icpolarity = TIMER_IC_POLARITY_FALLING; timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI; timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1; timer_icinitpara.icfilter = 0x0; timer_input_capture_config(TIMER0,TIMER_CH_1,&timer_icinitpara); nvic_irq_enable(TIMER0_Channel_IRQn, 1, 1); timer_primary_output_config(TIMER0, ENABLE); /* auto-reload preload enable */ timer_auto_reload_shadow_enable(TIMER0); /* clear channel 0 interrupt bit */ timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_CH1); /* channel 0 interrupt enable */ timer_interrupt_enable(TIMER0,TIMER_INT_CH1); /* TIMER1 counter enable */ timer_enable(TIMER0); }

这是一个针对GD32F305芯片的定时器配置函数，主要是用于输入捕获模式。下面是代码的解释：

1. 开启TIMER0时钟

rcu_periph_clock_enable(RCU_TIMER0);

2. 复位TIMER0

timer_deinit(TIMER0);

3. 配置TIMER0的基本参数，包括计数器方向、计数器分频、计数器模式、计数器周期

timer_parameter_struct timer_initpara;
timer_initpara.prescaler         = 119;
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(TIMER0,&timer_initpara);

4. 配置TIMER0的输入捕获通道，包括极性、输入捕获选择、预分频和滤波器参数

timer_ic_parameter_struct timer_icinitpara;
timer_icinitpara.icpolarity  = TIMER_IC_POLARITY_FALLING;
timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
timer_icinitpara.icfilter    = 0x0;
timer_input_capture_config(TIMER0,TIMER_CH_1,&timer_icinitpara);

5. 配置TIMER0的中断

nvic_irq_enable(TIMER0_Channel_IRQn, 1, 1);
timer_primary_output_config(TIMER0, ENABLE);
/* auto-reload preload enable */     
timer_auto_reload_shadow_enable(TIMER0);
/* clear channel 0 interrupt bit */     
timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_CH1);
/* channel 0 interrupt enable */     
timer_interrupt_enable(TIMER0,TIMER_INT_CH1);

6. 开启TIMER0计数

timer_enable(TIMER0);

总体来说，这个函数的作用是配置TIMER0为输入捕获模式，其中TIMER0的计数器值会根据外部信号的变化而变化，以实现计时和计数等功能。其中的nvic_irq_enable函数是用于使能TIMER0的中断，timer_interrupt_enable函数是用于使能TIMER0的输入捕获通道中断。需要注意的是，这个函数只是一个配置函数，需要在调用时传入相应的参数才能实现具体的功能。

用GD32f450vet6芯片控制电机驱动程序

控制电机需要使用芯片的PWM功能，下面是基于GD32F450芯片的电机驱动程序的代码示例：

1. 配置PWM定时器

/* 配置PWM定时器 */
void PWM_Timer_Configuration(void)
{
    timer_oc_parameter_struct timer_ocintpara;
    timer_parameter_struct timer_initpara;

    rcu_periph_clock_enable(RCU_TIMER0);
    rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);
    timer_deinit(TIMER0);
    /* TIMER0 configuration */
    timer_initpara.prescaler         = 3;             // 计数器时钟分频系数
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;  // 边沿对齐计数模式
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;    // 向上计数
    timer_initpara.period            = 1000;          // PWM周期
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;   // 时钟分割
    timer_initpara.repetitioncounter = 0;             // 重复计数器值
    timer_init(TIMER0, &timer_initpara);

    /* Timer0 PWM channel configuration */
    timer_ocintpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;
    timer_ocintpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
    timer_ocintpara.outputstate  = TIMER_CCX_ENABLE;
    timer_ocintpara.outputnstate = TIMER_CCXN_DISABLE;
    timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;
    timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_HIGH;

    timer_channel_output_config(TIMER0, TIMER_CH_0, &timer_ocintpara);
    timer_channel_output_pulse_value_config(TIMER0, TIMER_CH_0, 0);
    timer_channel_output_mode_config(TIMER0, TIMER_CH_0, TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER0, TIMER_CH_0, TIMER_OC_SHADOW_DISABLE);

    timer_primary_output_config(TIMER0, ENABLE);
    /* auto-reload preload enable */
    timer_auto_reload_shadow_enable(TIMER0);
    /* enable timer */
    timer_enable(TIMER0);
}

2. 配置PWM输出引脚

/* 配置PWM输出引脚 */
void PWM_GPIO_Configuration(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);
    gpio_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_0);
}

3. 控制电机旋转

/* 控制电机旋转 */
void Motor_Control(uint16_t pwm_value)
{
    timer_channel_output_pulse_value_config(TIMER0, TIMER_CH_0, pwm_value);
}

以上是基本的电机驱动程序，你可以根据具体的电机参数和需求进行调整。