def test_in_range_pins(smbus2):
from ioexpander import IOE, PIN_MODE_IN
ioe = IOE(skip_chip_id_check=True)
for pin in range(1, 15):
ioe.set_mode(pin, PIN_MODE_IN)
def test_non_pwm_set_mode_should_raise_valueerror(smbus2):
from ioexpander import IOE, PIN_MODE_PWM
ioe = IOE(skip_chip_id_check=True)
with pytest.raises(ValueError):
ioe.set_mode(10, PIN_MODE_PWM)
def test_set_pwm_control(smbus2):
from ioexpander import IOE, PIN_MODE_PWM
ioe = IOE(skip_chip_id_check=True)
ioe.set_mode(1, PIN_MODE_PWM)
ioe.set_pwm_control(divider=8)
def test_setup_valid_chip_id(smbus2):
from ioexpander import IOE
"""
Using side_effect on i2c_msg returns the
right values in sequence for our read8 calls:
msg_r = i2c_msg.read(self._i2c_addr, 1)
self._i2c_dev.i2c_rdwr(msg_r)
return list(msg_r)[0]
"""
smbus2.i2c_msg.read.side_effect = [[0xe2], [0x6a]]
ioe = IOE()
del ioe
def test_out_of_range_pins(smbus2):
from ioexpander import IOE, PIN_MODE_IN
ioe = IOE(skip_chip_id_check=True)
with pytest.raises(ValueError):
ioe.set_mode(0, PIN_MODE_IN)
with pytest.raises(ValueError):
ioe.set_mode(15, PIN_MODE_IN)
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
def test_setup(smbus2):
from ioexpander import IOE
ioe = IOE(skip_chip_id_check=True)
del ioe
def test_setup_invalid_chip_id(smbus2):
from ioexpander import IOE
with pytest.raises(RuntimeError):
ioe = IOE()
del ioe