2-gpioe event 寄存器配置方式(nrf52832)

实验目的： 

(1)按下按键，产生外部中断，由中断服务函数使LED翻转

实验原理：

(1)GPIOE 寄存器：

 (2)设置GPIOE的CONFIG寄存器，实现GPIOE与普通GPIO绑定

实验代码：

(1)External Interrupt Init function

//event
void EXIT_KEY_Init(void)
{
     nrf_gpio_cfg_input(13,NRF_GPIO_PIN_PULLUP);//key 1
     nrf_gpio_cfg_input(14,NRF_GPIO_PIN_PULLUP);//key 2
    
    NVIC_EnableIRQ(GPIOTE_IRQn);//Enable External Interrupt
    
    //key1
    NRF_GPIOTE->CONFIG[0] = (13 << GPIOTE_CONFIG_PSEL_Pos)  //IO port 
                              | (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos)//Mode -> event or task or disable
                            |(GPIOTE_CONFIG_POLARITY_HiToLo << GPIOTE_CONFIG_POLARITY_Pos);//POLARITY  HiToLo
    NRF_GPIOTE->INTENSET  = GPIOTE_INTENSET_IN0_Set << GPIOTE_INTENSET_IN0_Pos;// enable INT
    
    
    //key2
    NRF_GPIOTE->CONFIG[1] =  (GPIOTE_CONFIG_POLARITY_HiToLo << GPIOTE_CONFIG_POLARITY_Pos)
                           | (14<< GPIOTE_CONFIG_PSEL_Pos)  
                           | (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos);
    NRF_GPIOTE->INTENSET  = GPIOTE_INTENSET_IN1_Set << GPIOTE_INTENSET_IN1_Pos;
}

(2)

void GPIOTE_IRQHandler(void)
{
 if ((NRF_GPIOTE->EVENTS_IN[0] == 1) &&       //judge Interrupt event
        (NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_IN0_Msk))//meanwhile, enable INT0
    {
        NRF_GPIOTE->EVENTS_IN[0] = 0; //clear INT flag 
              nrf_delay_ms(10);    //key shake off
             if(nrf_gpio_pin_read(13)== 0)
             {
              nrf_gpio_pin_toggle(17);//led   toggle
             }
     }
 if ((NRF_GPIOTE->EVENTS_IN[1] == 1) && 
        (NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_IN1_Msk))
    {
        NRF_GPIOTE->EVENTS_IN[1] = 0; //clear INT flag 
            nrf_delay_ms(10);    //key shake off
              nrf_gpio_pin_toggle(18);
    }
}

实验视频：

https://www.bilibili.com/video/BV1Mp4y1k7Hh/