gistfile1.c

#include "ets_sys.h"
#include "driver/uart.h"
#include "osapi.h"
#include "at.h"
#include "key.h"
#include "gpio.h"

static volatile os_timer_t some_timer;

void some_timerfunc(void *arg)
{
    uart0_sendStr("Key press\r\n");

    //enable interrupt
    gpio_pin_intr_state_set(GPIO_ID_PIN(0), GPIO_PIN_INTR_NEGEDGE);
}

LOCAL void
key_intr_handler(int8_t key)
{
    uint32 gpio_status = GPIO_REG_READ(GPIO_STATUS_ADDRESS);
    //disable interrupt
    gpio_pin_intr_state_set(GPIO_ID_PIN(0), GPIO_PIN_INTR_DISABLE);

    //Arm the debounce timer
    os_timer_arm(&some_timer, 100, 0);

    //clear interrupt status
    GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, gpio_status & BIT(0));
}

void ICACHE_FLASH_ATTR
key_init()
{
    uint8 i;

    //Setup timer
    os_timer_disarm(&some_timer);
    os_timer_setfn(&some_timer, (os_timer_func_t *)some_timerfunc, NULL);

    //Do interrupt magic
    ETS_GPIO_INTR_ATTACH(key_intr_handler,0);
    ETS_GPIO_INTR_DISABLE();
    PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0);
    gpio_output_set(0, 0, 0, GPIO_ID_PIN(0));
    gpio_register_set(GPIO_PIN_ADDR(0), GPIO_PIN_INT_TYPE_SET(GPIO_PIN_INTR_DISABLE)
          | GPIO_PIN_PAD_DRIVER_SET(GPIO_PAD_DRIVER_DISABLE)
          | GPIO_PIN_SOURCE_SET(GPIO_AS_PIN_SOURCE));

    //clear gpio status
    GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, BIT(0));

    //enable interrupt
    gpio_pin_intr_state_set(GPIO_ID_PIN(0), GPIO_PIN_INTR_NEGEDGE);
    ETS_GPIO_INTR_ENABLE();

}