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Made chip_select default to None #17

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Merged
merged 3 commits into from
May 14, 2018
Merged

Made chip_select default to None #17

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4ea85ff
Made chip_select default to None, all chip_select usage checks exista…
cerickson May 14, 2018
1993c52
Fixed __init__ args line length for pylint
cerickson May 14, 2018
85d5cca
Fixed trailing space pylint error
cerickson May 14, 2018
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12 changes: 8 additions & 4 deletions adafruit_bus_device/spi_device.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,25 +65,29 @@ class SPIDevice:
with device as spi:
spi.write(bytes_read)
"""
def __init__(self, spi, chip_select, *, baudrate=100000, polarity=0, phase=0, extra_clocks=0):
def __init__(self, spi, chip_select=None, *,
baudrate=100000, polarity=0, phase=0, extra_clocks=0):
self.spi = spi
self.baudrate = baudrate
self.polarity = polarity
self.phase = phase
self.extra_clocks = extra_clocks
self.chip_select = chip_select
self.chip_select.switch_to_output(value=True)
if self.chip_select:
self.chip_select.switch_to_output(value=True)

def __enter__(self):
while not self.spi.try_lock():
pass
self.spi.configure(baudrate=self.baudrate, polarity=self.polarity,
phase=self.phase)
self.chip_select.value = False
if self.chip_select:
self.chip_select.value = False
return self.spi

def __exit__(self, *exc):
self.chip_select.value = True
if self.chip_select:
self.chip_select.value = True
if self.extra_clocks > 0:
buf = bytearray(1)
buf[0] = 0xff
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