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led_test.py
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led_test.py
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"""
Adapted from pyftdi library
by:
B Forys, brandon.forys@alumni.ubc.ca
Run this script to test an LED or similar input on a breakout board.
Call the LEDTest() class in this script to test a specific GPIO port on the board
"""
from pyftdi.ftdi import Ftdi
from pyftdi.gpio import GpioController, GpioException
from os import environ
from time import sleep
class LEDTest():
"""Test for LED on FT232H board"""
def __init__(self):
self._gpio = GpioController()
self._state = 0 # SW cache of the GPIO output lines
def pins(self):
print(self._gpio.direction)
def open(self, out_pins):
"""Open a GPIO connection, defining which pins are configured as
output and input"""
out_pins &= 0xFF
url = environ.get('FTDI_DEVICE', 'ftdi://ftdi:232h/1')
self._gpio.open_from_url(url, direction=out_pins)
def close(self):
"""Close the GPIO connection"""
self._gpio.close()
def get_gpio(self, line):
"""Retrieve the level of a GPIO input pin
:param line: specify which GPIO to read out.
:return: True for high-level, False for low-level
"""
value = self._gpio.read_port()
print(value)
return bool(value & (1 << line))
def set_gpio(self, line, on):
"""Set the level of a GPIO ouput pin.
:param line: specify which GPIO to madify.
:param on: a boolean value, True for high-level, False for low-level
"""
if on:
state = self._state | (1 << line)
else:
state = self._state & ~(1 << line)
self._commit_state(state)
def _commit_state(self, state):
"""Update GPIO outputs
"""
self._gpio.write_port(state)
# do not update cache on error
self._state = state
if __name__ == '__main__':
LEDTest = LEDTest()
mask = 0xFF
# gp = output pin on your breakout board. Adjust this parameter to change the port
# you wish to test.
gp = 7
LEDTest.open(mask)
try:
LEDTest.set_gpio(gp, True)
except GpioException:
print("Error with illumination!")
sleep(0.3)
try:
LEDTest.set_gpio(gp, False)
except GpioException:
print("Error!")
sleep(.3)
LEDTest.close()