"""
Flash an LED connected via a FTDI UM232R/245R module using pylibftdi
Optionally supply a flash rate (in Hz, default 1) as an argument
Copyright (c) 2010-2014 Ben Bass <benbass@codedstructure.net>
All rights reserved.
"""
import time
import sys
from pylibftdi import BitBangDevice
[docs]def flash_forever(rate):
"toggle bit zero at rate Hz"
# put an LED with 1Kohm or similar series resistor
# on D0 pin
with BitBangDevice() as bb:
while True:
time.sleep(1.0 / (2 * rate))
bb.port ^= 1
[docs]def main():
if len(sys.argv) > 1:
rate = float(sys.argv[1])
flash_forever(rate)
else:
flash_forever(1)
if __name__ == '__main__':
main()