def test_adc_input_timeout_should_raise_runtimeerror(smbus2):
from ioexpander import IOE, PIN_MODE_ADC
ioe = IOE(skip_chip_id_check=True)
ioe.set_mode(7, PIN_MODE_ADC)
assert ioe.get_mode(7) == PIN_MODE_ADC
# Always return the high bit cleared, this pretends bit 7 of REG_ADCCON0 is cleared
# and causes an "ADC read" to raise a timeout exception.
smbus2.i2c_msg.read().__iter__.return_value = [0b00000000]
with pytest.raises(RuntimeError):
ioe.input(7, adc_timeout=0.1)
def test_gpio_input_pull_up(smbus2):
from ioexpander import IOE, PIN_MODE_PU, HIGH, LOW
ioe = IOE(skip_chip_id_check=True)
ioe.set_mode(1, PIN_MODE_PU)
assert ioe.get_mode(1) == PIN_MODE_PU
# Always LOW result
smbus2.i2c_msg.read().__iter__.return_value = [0b00000000]
assert ioe.input(1) == LOW
# Always HIGH result
smbus2.i2c_msg.read().__iter__.return_value = [0b11111111]
assert ioe.input(1) == HIGH
def test_adc_input(smbus2):
from ioexpander import IOE, PIN_MODE_ADC
ioe = IOE(skip_chip_id_check=True)
ioe.set_mode(7, PIN_MODE_ADC)
assert ioe.get_mode(7) == PIN_MODE_ADC
# Always return the high bit set, this pretends bit 7 of REG_ADCCON0 is set
# and allows an "ADC read" to complete without a timeout exception.
smbus2.i2c_msg.read().__iter__.return_value = [0b10000000]
result = ioe.input(7)
assert type(result) is float
# (128 << 4) | 128 / 4095.0 * 3.3
# round to 2dp to account for FLOATING POINT WEIRDNESS!
assert round(result, 2) == 1.75
ioe.set_adc_vref(5.0)
result = ioe.input(7)
# (128 << 4) | 128 / 4095.0 * 5.0
assert round(result, 2) == 2.66