import time
import RPi.GPIO as GPIO
import tkinter as tk
import smbus

cnt = 0
sensor_pin = 5
after = ''
 
GPIO.setmode(GPIO.BCM)
GPIO.setup(sensor_pin, GPIO.IN)

CHANNEL = 1
ICADDR = 0x20
REG_IODIRA = 0x00 # GPAの方向レジスタ
REG_IODIRB = 0x01 # GPBの方向レジスタ
REG_GPIOA = 0x12 # GPAの入力データレジスタ
REG_OLATA = 0x14 # GPAの出力データレジスタ
REG_GPIOB = 0x13 # GPBの入力データレジスタ
REG_OLATB = 0x15 # GPBの出力データレジスタ

i2c = smbus.SMBus(CHANNEL)
i2c.write_byte_data(ICADDR, REG_IODIRA, 0xFF) # GPAを全て入力に設定
i2c.write_byte_data(ICADDR, REG_IODIRB, 0x00) # GPBを全て出力に設定

def pulse_count(channel):
    global cnt
    
    cnt += 1

def get_counter():
    global cnt, after

    sw = i2c.read_byte_data(ICADDR, REG_GPIOA) #GPAの読み込み
    if (sw == 0b11111110):
        direction = 'N'
        after = 'N'
    elif(sw == 0b11111101):
        direction = 'NE'
        after = 'NE'
    elif(sw == 0b11111011):
        direction = 'E'
        after = 'E'
    elif(sw == 0b11110111):
        direction = 'SE'
        after = 'SE'
    elif(sw == 0b11101111):
        direction = 'S'
        after = 'S'
    elif(sw == 0b11011111):
        direction = 'SW'
        after = 'SW'
    elif(sw == 0b10111111):
        direction = 'W'
        after = 'W'
    elif(sw == 0b01111111):
        direction = 'NW'
        after = 'NW'
    else:
        direction = after
    label2['text'] = '  '
    label2['text'] = direction
    label4['text'] = '     '
    label4['text'] = str(cnt / 100)
    cnt = 0
    root.after(5000, get_counter)

root = tk.Tk()
root.geometry('300x200+20+100')
root.title('風向・風速計テスト')
label1 = tk.Label(root, text = '風向：')
label1.place(x=80, y=60)
label2 = tk.Label(root, text = str(''))
label2.place(x=200, y=60)
label3 = tk.Label(root, text = '風速（m/s）：')
label3.place(x=80, y=100)
label4 = tk.Label(root, text = str(cnt))
label4.place(x=200, y=100)
GPIO.add_event_detect(sensor_pin, GPIO.RISING, callback=pulse_count, bouncetime=10)
get_counter()
root.mainloop()