#!/usr/bin/python
import spidev
import io # used to create file streams
import fcntl # used to access I2C parameters like addresses
import os
from datetime import datetime
import time # used for sleep delay and timestamps
import string # helps parse strings
import RPi.GPIO as GPIO # Importamos la libreria GPIO con sus modulos


GPIO.setmode(GPIO.BCM) # Le decimos como queremos contar los pines


#We use pin number 23 as input conected to 3.3V to coun the pulses and using  the pull down resistors
GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

#Setting the off button with pull up resistors
GPIO.setup(4, GPIO.IN,pull_up_down=GPIO.PUD_UP)

n = 0
flag = False
p = 0
spi =spidev.SpiDev()
spi.open(0, 0)

#A function to make sure that there are pulses but its not relevant for #my problem
def comprobar(f):
    global flag, p
    if f == 1:
        flag = True
    else:
        flag = False
    return flag
#Temperature non relevant
def leeradc(numadc):
    r = spi.xfer2([1, 8 + numadc << 4, 0])
    adcout = ((r[1] & 3 ) << 8) + r[2]
    return adcout

# The off interruption
def apagar(channel):
    os.system("echo $(sudo shutdown -h now)")
    time.sleep(1)

#Pulse interruption as you can see and I explained if i uncomment   #os.system if works fine with this interruption it’s the other one that  #doesn’t work
def interrupcion(channel):
    #os.system("echo $(sudo shutdown -h now)")
    global n,p
    p = 1
    comprobar(p)
    n = n + 1
    return n
#Non relevant code thats just for reading the sensors using I2C and SPI for a temperature
# Main loop where i call the add_event detect
def main():
    device = atlas_i2c() # creates the I2C port object, specify the address or bus if necessary
    GPIO.add_event_detect(23, GPIO.FALLING, callback = interrupcion, bouncetime = 800)
    GPIO.add_event_detect(4, GPIO.RISING, callback = apagar, bouncetime=600)
    global flag, n
    print(">> Atlas Scientific sample code")
    print(">> Any commands entered are passed to the board via I2C except:")
    print(">> Address,xx changes the I2C address the Raspberry Pi communicates with.")
    print(">> Poll,xx.x command continuously polls the board every xx.x seconds")
    print(" where xx.x is longer than the %0.2f second timeout." %  atlas_i2c.long_timeout)
    print(" Pressing ctrl-c will stop the polling")
    global p
    # main loop