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# Test machine.Counter implementation
#
# IMPORTANT: This test requires hardware connections: the out_pin and in_pin
# must be wired together.
try:
from machine import Counter
except ImportError:
print("SKIP")
raise SystemExit
import sys
from machine import Pin
if "esp32" in sys.platform:
id = 0
out_pin = 4
in_pin = 5
else:
print("Please add support for this test on this platform.")
raise SystemExit
import unittest
out_pin = Pin(out_pin, mode=Pin.OUT)
in_pin = Pin(in_pin, mode=Pin.IN)
def toggle(times):
for _ in range(times):
out_pin(1)
out_pin(0)
class TestCounter(unittest.TestCase):
def setUp(self):
out_pin(0)
self.counter = Counter(id, in_pin)
def tearDown(self):
self.counter.deinit()
def assertCounter(self, value):
self.assertEqual(self.counter.value(), value)
def test_connections(self):
# Test the hardware connections are correct. If this test fails, all tests will fail.
out_pin(1)
self.assertEqual(1, in_pin())
out_pin(0)
self.assertEqual(0, in_pin())
def test_count_rising(self):
self.assertCounter(0)
toggle(100)
self.assertCounter(100)
out_pin(1)
self.assertEqual(self.counter.value(0), 101)
self.assertCounter(0) # calling value(0) resets
out_pin(0)
self.assertCounter(0) # no rising edge
out_pin(1)
self.assertCounter(1)
def test_change_directions(self):
self.assertCounter(0)
toggle(100)
self.assertCounter(100)
self.counter.init(in_pin, direction=Counter.DOWN)
self.assertCounter(0) # calling init() zeroes the counter
self.counter.value(100) # need to manually reset the value
self.assertCounter(100)
toggle(25)
self.assertCounter(75)
def test_count_falling(self):
self.counter.init(in_pin, direction=Counter.UP, edge=Counter.FALLING)
toggle(20)
self.assertCounter(20)
out_pin(1)
self.assertCounter(20) # no falling edge
out_pin(0)
self.assertCounter(21)
self.counter.value(-(2**24))
toggle(20)
self.assertCounter(-(2**24 - 20))
if __name__ == "__main__":
unittest.main()
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