【GD32F310开发板试用】CMSIS-DAP上电只能烧录一次问题解决&定时器脉宽采集

兆易创新家的GD32F310的开发板到手了，今天给玩一玩。
我们先看看兆易创新如何解释自家的MCU
截图.png

确认过眼神！哈哈

GD32F310拥有TSSOP20、QFN28、QFN32、LQFP32以及LQFP48共5种封装类型，采用Arm Cortex-M4内核，性能强劲，其内部集成了FPU,
下图是Cortex-M4内核的主要功能

** 截图 (1).png
**CMSIS-DAP烧录问题
板子到手之后出现一个问题，CMSIS-DAP上电之后只能烧录一次单片机，弄了好久，感觉GPIO复用功能没有打开。
在GD32F3x0 固件库手册找到函数 gpio\_af\_set

函数原型：void gpio_af_set(uint32_t gpio_periph, uint32_t alt_func_num, uint32_t pin);
功能描述： 设置GPIO的备用功能
 参数      ：
 gpio_periph     GPIO 端口
 alt_func_num  GPIO 引脚备用功能
 pin                   GPIO引脚

用这个函数把P13,P14的GPIO复用功能打开就好了，就是这三行代码

rcu_periph_clock_enable(RCU_GPIOA);
gpio_af_set(GPIOA,GPIO_AF_0,GPIO_PIN_13);
gpio_af_set(GPIOA,GPIO_AF_0,GPIO_PIN_14);

定时器采集脉宽
第一步初始GPIO

void gpio_configuration(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);

    
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_4);
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_4);

    gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_4);
}

选择PB4作为脉宽输入，其复用功能为TIMER\_CH0;TIMER\_CH0;
第二步 配置嵌套矢量中断控制器

void nvic_configuration(void)
{
    nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
    nvic_irq_enable(TIMER2_IRQn, 1, 1);
}

第三步初始化定时器

void timer_configuration(void)
{
   
    timer_ic_parameter_struct timer_icinitpara;
    timer_parameter_struct timer_initpara;

    rcu_periph_clock_enable(RCU_TIMER2);

    timer_deinit(TIMER2);


        timer_initpara.prescaler         = 7199;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;//边沿对齐
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;    //向上计数
    timer_initpara.period            = 65535;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;//分频因子
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER2, &timer_initpara);

    /* TIMER2  configuration */
    /* TIMER2 CH0 input capture configuration */
    timer_icinitpara.icpolarity  = TIMER_IC_POLARITY_FALLING ;    //输入捕获下降沿
    timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
    timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
    timer_icinitpara.icfilter    = 0x0;
    timer_input_capture_config(TIMER2, TIMER_CH_0, &timer_icinitpara);

    /* auto-reload preload enable */
    timer_auto_reload_shadow_enable(TIMER2);
    /* clear channel 0 interrupt bit */
    timer_interrupt_flag_clear(TIMER2, TIMER_INT_CH0);
    /* channel 0 interrupt enable */
    timer_interrupt_enable(TIMER2, TIMER_INT_CH0);

    /* TIMER2 counter enable */
    timer_enable(TIMER2);
}

第三步配置定时器中断

void TIMER2_IRQHandler(void)
{
    if(SET == timer_interrupt_flag_get(TIMER2, TIMER_INT_FLAG_CH0)) {
       
        timer_interrupt_flag_clear(TIMER2, TIMER_INT_FLAG_CH0);

        if(0 == ccnumber) {
            //读取通道 0 捕获值
            readvalue1 = timer_channel_capture_value_register_read(TIMER2, TIMER_CH_0);
                        TIMER_CHCTL2(TIMER2) &= (~(uint32_t)(TIMER_CHCTL2_CH0P | TIMER_CHCTL2_CH0NP));
                        TIMER_CHCTL2(TIMER2) |= (uint32_t)(TIMER_IC_POLARITY_RISING);    
            ccnumber = 1;
        } else if(1 == ccnumber) {
           
            readvalue2 = timer_channel_capture_value_register_read(TIMER2, TIMER_CH_0);
                        TIMER_CHCTL2(TIMER2) &= (~(uint32_t)(TIMER_CHCTL2_CH0P | TIMER_CHCTL2_CH0NP));
                        TIMER_CHCTL2(TIMER2) |= (uint32_t)(TIMER_IC_POLARITY_FALLING);    
            if(readvalue2 > readvalue1) {
                count = (readvalue2 - readvalue1);
            } else {
                count = ((0xFFFF - readvalue1) + readvalue2);
            }
            ccnumber = 0;
        }
    }
}

第四步主函数

int main(void)
{
    rcu_periph_clock_enable(RCU_GPIOA);
    gpio_af_set(GPIOA,GPIO_AF_0,GPIO_PIN_13);
        gpio_af_set(GPIOA,GPIO_AF_0,GPIO_PIN_14);
    
    gpio_configuration();
    nvic_configuration();
    timer_configuration();

    while(1){
    delay_1ms(100);
        printf("\r /****按键脉宽：%d****/\r\n",count);
       } 
    
}

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