def test_loopback(self):
"""Test output loops back to another input"""
GPIO.setup(LOOP_IN, GPIO.IN, pull_up_down=GPIO.PUD_OFF)
GPIO.setup(LOOP_OUT, GPIO.OUT, initial=GPIO.LOW)
self.assertEqual(GPIO.input(LOOP_IN), GPIO.LOW)
GPIO.output(LOOP_OUT, GPIO.HIGH)
self.assertEqual(GPIO.input(LOOP_IN), GPIO.HIGH)
def test_outputread(self):
"""Test that an output() can be input()"""
GPIO.setup(LED_PIN, GPIO.OUT)
GPIO.output(LED_PIN, GPIO.HIGH)
self.assertEqual(GPIO.input(LED_PIN), GPIO.HIGH)
GPIO.output(LED_PIN, GPIO.LOW)
self.assertEqual(GPIO.input(LED_PIN), GPIO.LOW)
def test_output_list(self):
"""Test output() using lists"""
GPIO.setup(LOOP_OUT, GPIO.OUT)
GPIO.setup(LED_PIN, GPIO.OUT)
GPIO.output([LOOP_OUT, LED_PIN], GPIO.HIGH)
self.assertEqual(GPIO.input(LOOP_OUT), GPIO.HIGH)
self.assertEqual(GPIO.input(LED_PIN), GPIO.HIGH)
GPIO.output((LOOP_OUT, LED_PIN), GPIO.LOW)
self.assertEqual(GPIO.input(LOOP_OUT), GPIO.LOW)
self.assertEqual(GPIO.input(LED_PIN), GPIO.LOW)
GPIO.output([LOOP_OUT, LED_PIN], [GPIO.HIGH, GPIO.LOW])
self.assertEqual(GPIO.input(LOOP_OUT), GPIO.HIGH)
self.assertEqual(GPIO.input(LED_PIN), GPIO.LOW)
GPIO.output((LOOP_OUT, LED_PIN), (GPIO.LOW, GPIO.HIGH))
self.assertEqual(GPIO.input(LOOP_OUT), GPIO.LOW)
self.assertEqual(GPIO.input(LED_PIN), GPIO.HIGH)
with self.assertRaises(RuntimeError):
GPIO.output([LOOP_OUT, LED_PIN], [0, 0, 0])
with self.assertRaises(RuntimeError):
GPIO.output([LOOP_OUT, LED_PIN], (0, ))
with self.assertRaises(RuntimeError):
GPIO.output(LOOP_OUT, (0, 0))
with self.assertRaises(ValueError):
GPIO.output([LOOP_OUT, 'x'], (0, 0))
with self.assertRaises(ValueError):
GPIO.output([LOOP_OUT, LED_PIN], (0, 'x'))
with self.assertRaises(ValueError):
GPIO.output([LOOP_OUT, GND_PIN], (0, 0))
with self.assertRaises(RuntimeError):
GPIO.output([LOOP_OUT, LOOP_IN], (0, 0))
def runTest(self):
# Test mode not set (BOARD or BCM) exception
with self.assertRaises(RuntimeError) as e:
GPIO.setup(LED_PIN, GPIO.OUT)
self.assertEqual(
str(e.exception),
'Please set pin numbering mode using GPIO.setmode(GPIO.BOARD) or GPIO.setmode(GPIO.BCM)'
)
# Test trying to change mode after it has been set
GPIO.setmode(GPIO.BCM)
with self.assertRaises(ValueError) as e:
GPIO.setmode(GPIO.BOARD)
GPIO.setup(LED_PIN_BCM, GPIO.IN)
GPIO.cleanup()
# Test setting an invalid mode
with self.assertRaises(ValueError):
GPIO.setmode(666)
# Test getmode()
self.assertEqual(GPIO.getmode(), None)
GPIO.setmode(GPIO.BCM)
self.assertEqual(GPIO.getmode(), GPIO.BCM)
GPIO.setup(LED_PIN_BCM, GPIO.IN)
GPIO.cleanup()
GPIO.setmode(GPIO.BOARD)
self.assertEqual(GPIO.getmode(), GPIO.BOARD)
# Test not set as OUTPUT message
GPIO.setmode(GPIO.BOARD)
with self.assertRaises(RuntimeError) as e:
GPIO.output(LED_PIN, GPIO.HIGH)
self.assertEqual(str(e.exception),
'The GPIO channel has not been set up as an OUTPUT')
# Test setup(..., pull_up_down=GPIO.HIGH) raises exception
GPIO.setmode(GPIO.BOARD)
with self.assertRaises(ValueError):
GPIO.setup(LED_PIN, GPIO.IN, pull_up_down=GPIO.HIGH)
# Test not valid on a raspi exception
GPIO.setmode(GPIO.BOARD)
with self.assertRaises(ValueError) as e:
GPIO.setup(GND_PIN, GPIO.OUT)
self.assertEqual(str(e.exception),
'The channel sent is invalid on a Raspberry Pi')
# Test 'already in use' warning
GPIO.setmode(GPIO.BOARD)
with open('/sys/class/gpio/export', 'wb') as f:
f.write(str(LED_PIN_BCM).encode())
time.sleep(0.2) # wait for udev to set permissions
with open('/sys/class/gpio/gpio%s/direction' % LED_PIN_BCM, 'wb') as f:
f.write(b'out')
time.sleep(0.2)
with warnings.catch_warnings(record=True) as w:
GPIO.setup(LED_PIN, GPIO.OUT) # generate 'already in use' warning
self.assertEqual(w[0].category, RuntimeWarning)
with open('/sys/class/gpio/unexport', 'wb') as f:
f.write(str(LED_PIN_BCM).encode())
GPIO.cleanup()
# test initial value of high reads back as high
GPIO.setmode(GPIO.BOARD)
GPIO.setup(LED_PIN, GPIO.OUT, initial=GPIO.HIGH)
self.assertEqual(GPIO.input(LED_PIN), GPIO.HIGH)
GPIO.cleanup()
# test initial value of low reads back as low
GPIO.setmode(GPIO.BOARD)
GPIO.setup(LED_PIN, GPIO.OUT, initial=GPIO.LOW)
self.assertEqual(GPIO.input(LED_PIN), GPIO.LOW)
GPIO.cleanup()
# test pull up/down works
GPIO.setmode(GPIO.BOARD)
for i in range(1000):
GPIO.setup(NC_PIN, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
time.sleep(0.001)
self.assertEqual(GPIO.input(NC_PIN), GPIO.LOW)
GPIO.setup(NC_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
time.sleep(0.001)
self.assertEqual(GPIO.input(NC_PIN), GPIO.HIGH)
GPIO.cleanup()
# test setup of a list of channels
GPIO.setmode(GPIO.BOARD)
GPIO.setup([LED_PIN, LOOP_OUT], GPIO.OUT)
self.assertEqual(GPIO.gpio_function(LED_PIN), GPIO.OUT)
self.assertEqual(GPIO.gpio_function(LOOP_OUT), GPIO.OUT)
GPIO.cleanup()
GPIO.setmode(GPIO.BOARD)
with self.assertRaises(ValueError) as e:
GPIO.setup([LED_PIN, GND_PIN], GPIO.OUT)
self.assertEqual(GPIO.gpio_function(LED_PIN), GPIO.OUT)
self.assertEqual(str(e.exception),
'The channel sent is invalid on a Raspberry Pi')
GPIO.cleanup()
# test setup of a tuple of channels
GPIO.setmode(GPIO.BOARD)
GPIO.setup((LED_PIN, LOOP_OUT), GPIO.OUT)
self.assertEqual(GPIO.gpio_function(LED_PIN), GPIO.OUT)
self.assertEqual(GPIO.gpio_function(LOOP_OUT), GPIO.OUT)
GPIO.cleanup()
# test warning when using pull up/down on i2c channels
GPIO.setmode(GPIO.BOARD)
if GPIO.RPI_INFO['P1_REVISION'] == 0: # compute module
pass # test not vailid
else: # revision 1, 2 or A+/B+
with warnings.catch_warnings(record=True) as w:
GPIO.setup(3, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
self.assertEqual(w[0].category, RuntimeWarning)
with warnings.catch_warnings(record=True) as w:
GPIO.setup(5, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
self.assertEqual(w[0].category, RuntimeWarning)
GPIO.cleanup()
# test non integer channel
GPIO.setmode(GPIO.BOARD)
with self.assertRaises(ValueError):
GPIO.setup('d', GPIO.OUT)
with self.assertRaises(ValueError):
GPIO.setup(('d', LED_PIN), GPIO.OUT)
# test setting pull_up_down on an output
GPIO.setmode(GPIO.BOARD)
with self.assertRaises(ValueError):
GPIO.setup(LOOP_OUT, GPIO.OUT, pull_up_down=GPIO.PUD_DOWN)
# test setting initial on an input
GPIO.setmode(GPIO.BOARD)
with self.assertRaises(ValueError):
GPIO.setup(LOOP_IN, GPIO.IN, initial=GPIO.LOW)