GD32F310K8xx外部中断和定时的测试

1.资料的获取
官网：http://www.gd32mcu.com/cn/download/8 ，获取GD32F310K-START板的资料，如图1-1

2.解压压缩文件，该文件的路径如图2-1

3.用KEIL5打开工程的路径
，然后GD32F310K_START.uvproj修改成GD32F310K_START.uvprojx,编译是没有问题，烧录方式是通过DAP烧录，把mini AB的USB线接好，就可以烧录！

如下是外部的初始化，如下：

void exti_config(void)
{
    /* enable the clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    rcu_periph_clock_enable(RCU_CFGCMP);

    /* configure GPIO as input */
    gpio_mode_set(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO_PIN_4);

    /* enable and set EXTI interrupt */
    nvic_irq_enable(EXTI4_15_IRQn, 1U, 0U);

    /* connect EXTI line to GPIO pin */
    syscfg_exti_line_config(EXTI_SOURCE_GPIOA, EXTI_SOURCE_PIN4);

    /* configure EXTI line */
    exti_init(EXTI_4, EXTI_INTERRUPT, EXTI_TRIG_FALLING);
    exti_interrupt_flag_clear(EXTI_4);
}

紧接着是定时器2的初始化：

/*!
    \brief      configure the TIMER peripheral
    \param[in]  none
    \param[out] none
    \retval     none
  */
void timer_config(void)
{
    /* -----------------------------------------------------------------------
    TIMER2CLK is 100KHz
    TIMER2 channel0 duty cycle = (25000/ 50000)* 100  = 50%
    ----------------------------------------------------------------------- */
    timer_oc_parameter_struct timer_ocintpara;
    timer_parameter_struct timer_initpara;

    rcu_periph_clock_enable(RCU_TIMER2);

    timer_deinit(TIMER2);

    /* TIMER configuration */
    timer_initpara.prescaler         = 719;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 49999;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER2,&timer_initpara);

    /* configurate CH0 in PWM mode0 */
    timer_ocintpara.ocpolarity  = TIMER_OC_POLARITY_HIGH;
    timer_ocintpara.outputstate = TIMER_CCX_ENABLE;

    timer_channel_output_config(TIMER2, TIMER_CH_0, &timer_ocintpara);

    timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_0, 24999);
    timer_channel_output_mode_config(TIMER2, TIMER_CH_0, TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER2, TIMER_CH_0, TIMER_OC_SHADOW_DISABLE);

    /* auto-reload preload enable */
    timer_auto_reload_shadow_enable(TIMER2);
    /* auto-reload preload enable */
    timer_enable(TIMER2);
}

gdio的初始化如下：

/*! 
    \brief      configure the GPIO ports
    \param[in]  none
    \param[out] none
    \retval     none
  */
void gpio_config(void)
{
    rcu_periph_clock_enable(RCU_GPIOA);
    /* configure PA6(TIMER2 CH0) as alternate function */
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_6);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_6);
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_6);
}

main函数部分：

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    /* initialize KEY and LED, configure SysTick */
    gd_eval_key_init(KEY_WAKEUP, KEY_MODE_EXTI);
    led_config();
    systick_config();

    /* flash the LED for test */
    led_flash(1);

    /* configure EXTI, TIMER */
    exti_config();
    gpio_config();
    timer_config();

    while(1){
    }
}

按下KEY_WAKEUP按键，就会触发相应的中断和定时器。