プログラムの修正を行いたい

Question

プログラムを実行すると下記のようなエラーがでてしまいます，修正するにはどのようにしたらよろしいのでしょうか．
Traceback (most recent call last):
File "/home/pi/Desktop/0901.py", line 362, in <module>
sys.stdout.write("Timer running: %i seconds\r" % (runtime + (motor.start() - start)))
TypeError: unsupported operand type(s) for -: 'NoneType' and 'NoneType'

Python
1     import smbus
2import RPi.GPIO as GPIO
3from time import sleep
4import math
5import atexit
6import sys
7import datetime
8import time
9import touchphat
10@touchphat.on_touch("Enter")
11def start_stop():
12    global start
13    global stopped
14    global runtime
15    if stopped:
16        start = motor.start()
17        stopped = False
18    else:
19        stopped = True
20        runtime += (time.time() - start)
21
22@touchphat.on_touch("Back")
23def reset():
24    global runtime
25    runtime = 0
26
27blanks = " " * 25 + "\r"
28
29class motorDrive:
30    in1 = 8
31    in2 = 11
32    en = 24
33    temp1 = 1
34    lastState = 'LOW'
35    GPIO.setmode(GPIO.BCM)
36    GPIO.setup(in1, GPIO.OUT)
37    GPIO.setup(in2, GPIO.OUT)
38    GPIO.setup(en, GPIO.OUT)
39    GPIO.output(in1, GPIO.LOW)
40    GPIO.output(in2, GPIO.LOW)
41    p = GPIO.PWM(en, 1000)
42    p.start(55)
43    
44    directionState = 'forward'
45    # #print("\n")
46    # #print("The default speed & direction of motor is LOW & Forward.....")
47    # #print("r-run s-stop f-forward b-backward l-low m-medium h-high e-exit")
48    # #print("\n")
49
50    def start(self):
51        
52        GPIO.output(self.in1, GPIO.HIGH)
53        GPIO.output(self.in2, GPIO.LOW)
54        self.directionState = 'forward'
55        #print("MOTOR STARTING")
56
57    def setPower(self, power):
58        if self.lastState == power:
59            return
60        if power == 'LOW':
61            self.p.ChangeDutyCycle(30)
62        elif power == 'MEDIUM':
63            self.p.ChangeDutyCycle(50)
64        elif power == 'HIGH':
65            self.p.ChangeDutyCycle(90)
66            
67        #print("PWR CHANGED ", self.lastState, " TO ", power)
68        self.lastState = power
69        
70    def setDirection(self, direction):
71        if self.directionState == direction:
72            return
73        if direction == "forward":
74            GPIO.output(self.in1, GPIO.HIGH)
75            GPIO.output(self.in2, GPIO.LOW)
76            self.setPower('LOW')
77        else:
78            GPIO.output(self.in1, GPIO.LOW)
79            GPIO.output(self.in2, GPIO.LOW)
80        #print("DIRECTION CHANGED ", self.directionState, " TO ", direction)
81        self.directionState = direction
82        
83    def stop(self):
84        GPIO.output(self.in1,GPIO.LOW)
85        GPIO.output(self.in2,GPIO.LOW)
86        #print("MOTOR stopING")
87        
88        
89    def clean(self):
90        self.stop()
91        GPIO.cleanup()
92        #print('GPIO cleanup')
93
94
95try:
96        while True:
97            if stopped and runtime > 0:
98              sys.stdout.write(blanks)
99              sys.stdout.write("motorstart: %i seconds\r" % runtime)
100              sys.stdout.flush()        
101            
102            elif stopped:
103              sys.stdout.write(blanks)
104              sys.stdout.write("Touch enter to start!\r")
105              sys.stdout.flush()
106            
107            else:
108              sys.stdout.write(blanks)
109              sys.stdout.write("Timer running: %i seconds\r" % (runtime + (motor.start() - start)))
110              sys.stdout.flush()
111            
112            accel_data = mpu.get_accel_data()
113            
114            y_angle = util.get_y_rotation(accel_data['x'], accel_data['y'], accel_data['z'])
115            
116            if y_angle < normalMin:
117                motor.setDirection("stop")
118            else:
119                motor.setDirection("forward")
120                   
121            if y_angle >= mediumMin and highMin < y_angle:
122                motor.setPower("HIGH")
123            elif y_angle >= highMin: 
124                motor.setPower("MEDIUM")
125            time.sleep(5)
126finally:
127    sys.stdout.close()
128    motor.clean()
129    time.sleep(0.5)     
130    
131atexit.register(exitHandler)
132
133        
134        
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Accepted Answer

TypeError: unsupported operand type(s) for -: 'NoneType' and 'NoneType'
NoneType同士の引き算はできませんよとのことですから、motor.start() と startの中身が設計通り入ってるか確認されたほうが良いと思います。

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