def test_backend_read_analogue() -> None:
"""Test that we can read the digital state of a pin."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
serial = cast(SBArduinoSerial, backend._serial)
serial.check_data_sent_by_constructor()
readings = [212, 535, 662, 385]
for i, expected_reading in enumerate(readings):
# "read analogue" command reads all four pins at once.
identifier = 14 + i
for j, reading in enumerate(readings):
serial.append_received_data(f"> a{j} {reading}".encode("utf-8"),
newline=True)
expected_voltage = (expected_reading / 1024.0) * 5.0
measured_voltage = backend.read_gpio_pin_analogue_value(identifier)
assert isclose(measured_voltage, expected_voltage)
serial.check_sent_data(b"A\n")
serial.check_all_received_data_consumed()
def test_backend_read_analogue_requires_analogue_pin() -> None:
"""Check that pins 2-13 are not supported by read analogue."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
with pytest.raises(NotSupportedByHardwareError):
backend.read_gpio_pin_analogue_value(13)
