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Merged
merged 5 commits into from
Aug 1, 2017
Merged

ShiftIn/ShiftOut #11

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442dd8e
added shiftinout
Jul 26, 2017
503596c
revised for tannewt
Jul 28, 2017
7b4625f
Add value type
tannewt Jul 28, 2017
7b611a5
Merge branch 'master' into master
tannewt Aug 1, 2017
f36e772
Use python style function capitalization.
tannewt Aug 1, 2017
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66 changes: 66 additions & 0 deletions simpleio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,72 @@

import digitalio
import math
import time

def shift_in(dataPin, clock, msb_first=True):
"""
Shifts in a byte of data one bit at a time. Starts from either the LSB or
MSB.

:param ~digitalio.DigitalInOut dataPin: pin on which to input each bit
:param ~digitalio.DigitalInOut clock: toggles to signal dataPin reads
:param bool msb_first: True when the first bit is most significant
:return: returns the value read
:rtype: int
"""

value = 0
i = 0

for i in range(0, 8):
clock.value = True
if msb_first:
value |= ((dataPin.value) << (7-i))
else:
value |= ((dataPin.value) << i)
clock.value = False
i+=1
return value

def shift_out(dataPin, clock, value, msb_first=True):
"""
Shifts out a byte of data one bit at a time. Data gets written to a data
pin. Then, the clock pulses hi then low

:param ~digitalio.DigitalInOut dataPin: value bits get output on this pin
:param ~digitalio.DigitalInOut clock: toggled once the data pin is set
:param bool msb_first: True when the first bit is most significant
:param int value: byte to be shifted

Example for Metro M0 Express:

.. code-block:: python

import digitalio
import simpleio
from board import *
clock = digitalio.DigitalInOut(D12)
dataPin = digitalio.DigitalInOut(D11)
clock.direction = digitalio.Direction.OUTPUT
dataPin.direction = digitalio.Direction.OUTPUT

while True:
valueSend = 500
# shifting out least significant bits
shift_out(dataPin, clock, (valueSend>>8), msb_first = False)
shift_out(dataPin, clock, valueSend, msb_first = False)
# shifting out most significant bits
shift_out(dataPin, clock, (valueSend>>8))
shift_out(dataPin, clock, valueSend)
"""
value = value&0xFF
for i in range(0, 8):
if msb_first:
tmpval = bool(value & (1 << (7-i)))
dataPin.value = tmpval
else:
tmpval = bool((value & (1 << i)))
dataPin.value = tmpval

class DigitalOut:
"""
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