Mercurial > templog
view py/gpio_rpi.py @ 581:b4d6f1ae0b9e
make overshoot_factor floating point
add a proper error message for noparamsyet
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 29 Nov 2015 09:30:36 +0800 |
parents | 92632a6d1dc6 |
children | b0c0e88cbfcc |
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import os import RPi.GPIO as GPIO from utils import L,D,EX,W __all__ = ["Gpio"] class Gpio(object): SYS_GPIO_BASE = '/sys/class/gpio/gpio' def __init__(self, pin, name): self.pin = pin self.name = name dir_fn = '%s%d/direction' % (self.SYS_GPIO_BASE, pin) with open(dir_fn, 'w') as f: # make sure it doesn't start "on" f.write('low') val_fn = '%s%d/value' % (self.SYS_GPIO_BASE, pin) self.value_file = open(val_fn, 'r+') def turn(self, value): self.value_file.seek(0) self.value_file.write('1' if value else '0') self.value_file.flush() def get_state(self): self.value_file.seek(0) buf = self.value_file.read().strip() if buf == '0': return False if buf != '1': E("Bad value read from gpio '%s': '%s'" % (self.value_file.name, buf)) return True def main(): g = Gpio(17, 'f') g.turn(1) print(g.get_state()) g.turn(0) print(g.get_state()) if __name__ == '__main__': main()