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Don't invert the polarity of the GPIO pins by default #21

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Merged
merged 4 commits into from
Feb 12, 2020
Merged

Don't invert the polarity of the GPIO pins by default #21

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b210ec5
configure pins as inputs without overriding other settings
jamespanic Feb 9, 2020
2150545
get rid of device context
jamespanic Feb 9, 2020
ffcc55a
adds register constants like MCP28017
jamespanic Feb 12, 2020
ecb63f1
Initialize like MCP28107
jamespanic Feb 12, 2020
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17 changes: 12 additions & 5 deletions adafruit_mcp230xx/mcp23008.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,14 @@
# pylint: disable=bad-whitespace
_MCP23008_ADDRESS = const(0x20)
_MCP23008_IODIR = const(0x00)
_MCP23008_IPOL = const(0x01)
_MCP23008_GPINTEN = const(0x02)
_MCP23008_DEFVAL = const(0x03)
_MCP23008_INTCON = const(0x04)
_MCP23008_IOCON = const(0x05)
_MCP23008_GPPU = const(0x06)
_MCP23008_INTF = const(0x07)
_MCP23008_INTCAP = const(0x08)
_MCP23008_GPIO = const(0x09)


Expand All @@ -50,11 +57,11 @@ class MCP23008(MCP230XX):

def __init__(self, i2c, address=_MCP23008_ADDRESS):
super().__init__(i2c, address)
# Reset device state to all pins as inputs (safest option).
with self._device as device:
# Write to MCP23008_IODIR register 0xFF followed by 9 zeros
# for defaults of other registers.
device.write('\x00\xFF\x00\x00\x00\x00\x00\x00\x00\x00\x00')

# Reset to all inputs with no pull-ups and no inverted polarity.
self.iodir = 0xFF
self.gppu = 0x00
self._write_u8(_MCP23008_IPOL, 0x00)

@property
def gpio(self):
Expand Down