输入事件设备

from maix import event
from select import select

def check_key():
	import os
	tmp = "/dev/input/by-path/"
	if os.path.exists(tmp):
		for i in os.listdir(tmp):
			if i.find("kbd") != -1:
				return tmp + i
	return "/dev/input/event0"

count = 0
dev = event.InputDevice(check_key())
while True:
	r, w, x = select([dev], [], [], 0) # if r == 0 or set 0 will read() raise BlockingIOError 
	if r:
		for data in dev.read():
			print(data)
			if data.code == 0x02:
				print('press key S1')
			if data.code == 0x03:
				print('press key S2')
			if data.value == 1 and data.code != 0:
				count += 1
		print('press sum:', count)