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1 import os |
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2 |
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3 from utils import L,D,EX,W |
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4 |
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5 __all__ = ["Gpio"] |
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6 |
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7 class Gpio(object): |
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8 SYS_GPIO_BASE = '/sys/class/gpio/gpio' |
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9 def __init__(self, pin, name): |
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10 self.pin = pin |
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11 self.name = name |
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12 |
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13 dir_fn = '%s%d/direction' % (self.SYS_GPIO_BASE, pin) |
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14 with open(dir_fn, 'w') as f: |
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15 # make sure it doesn't start "on" |
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16 f.write('low') |
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17 val_fn = '%s%d/value' % (self.SYS_GPIO_BASE, pin) |
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18 self.value_file = open(val_fn, 'r+') |
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19 |
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20 def turn(self, value): |
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21 self.value_file.seek(0) |
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22 self.value_file.write('1' if value else '0') |
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23 self.value_file.flush() |
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24 |
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25 def get_state(self): |
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26 self.value_file.seek(0) |
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27 buf = self.value_file.read().strip() |
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28 if buf == '0': |
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29 return False |
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30 if buf != '1': |
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31 E("Bad value read from gpio '%s': '%s'" |
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32 % (self.value_file.name, buf)) |
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33 return True |
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34 |
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35 |
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36 def main(): |
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37 g = Gpio(17, 'f') |
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38 g.turn(1) |
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39 |
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40 print(g.get_state()) |
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41 |
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42 g.turn(0) |
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43 |
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44 print(g.get_state()) |
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45 |
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46 if __name__ == '__main__': |
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47 main() |
