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In [1]:



    


import smbus
BUSNUM = 1
ADDRESS = 0x20

bus = smbus.SMBus(BUSNUM)



    











In [2]:



    


def write_pins(bus, address, bank, pins, value=False):
    value_int = value * 2 - 1
    
    output_bank = bus.read_byte_data(address, bank)
    
    if not (type(pins) == list):
        pins = [pins]

    if value:
        set_outputs = 0
    else:
        set_outputs = 0xff
    
    for pin in pins:
        set_outputs += (2**pin) * value_int
    
    if value:
        output_bank |= set_outputs
    else:
        output_bank &= set_outputs
    
    bus.write_byte_data(address, bank, output_bank)

def config_pins(bus, address, bank, pins, output=False):
    CONFB1A = 0x00
    CONFB2A = 0x01
    
    if bank == 'A':
        write_pins(bus, address, CONFB1A, pins, value=output)
    else:
        write_pins(bus, address, CONFB2A, pins, value=output)
    
def set_pins(bus, address, bank, pins, value):
    B1A = 0x12
    B2A = 0x13
    
    if not (type(pins) == list):
        pins = [pins]
    
    if bank == 'A':
        write_pins(bus, address, B1A, pins, value=value)
    else:
        write_pins(bus, address, B2A, pins, value=value)

def get_pins(bus, address, bank):
    B1A = 0x12
    B2A = 0x13
    
    if bank == 'A':
        return bus.read_byte_data(address, B1A)
    else:
        return bus.read_byte_data(address, B2A)
        
def get_pin_values(value, pins):
    if not (type(pins) == list):
        pins = [pins]
    return [(value >> pin) % 2 for pin in pins]



    











In [8]:



    


config_pins(bus, ADDRESS, 'A', [0], False)



    











In [35]:



    


set_pins(bus, ADDRESS, 'A', [0], True)
output_bank = get_pins(bus, ADDRESS, 'A')
get_pin_values(output_bank,2)[0]



    


















    
Out[35]:








0

















In [34]:



    


import time
a_prev = 0
t0 = time.time()
while True:
    a = get_pin_values(output_bank,2)[0]
    print(a)
    if a-a_prev == 1:
        t = time.time()
        T = t-t0
        t0 = t
        print(T)
    a_prev = a



    


















    






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---------------------------------------------------------------------------
KeyboardInterrupt                         Traceback (most recent call last)
<ipython-input-34-2a72cc7ff3c4> in <module>()
      4 while True:
      5     a = get_pin_values(output_bank,2)[0]
----> 6     print(a)
      7     if a-a_prev == 1:
      8         t = time.time()

/usr/lib/python2.7/dist-packages/IPython/zmq/iostream.pyc in write(self, string)
     78                 self._start = current_time
     79             elif current_time - self._start > self.flush_interval:
---> 80                 self.flush()
     81 
     82     def writelines(self, sequence):

/usr/lib/python2.7/dist-packages/IPython/zmq/iostream.pyc in flush(self)
     44                 content = {u'name':self.name, u'data':data}
     45                 msg = self.session.send(self.pub_socket, u'stream', content=content,
---> 46                                        parent=self.parent_header, ident=self.topic)
     47 
     48                 if hasattr(self.pub_socket, 'flush'):

/usr/lib/python2.7/dist-packages/IPython/zmq/session.pyc in send(self, stream, msg_or_type, content, parent, ident, buffers, subheader, track, header)
    567             tracker = stream.send_multipart(to_send, flag, copy=False, track=_track)
    568         else:
--> 569             tracker = stream.send_multipart(to_send, flag, copy=False)
    570         for b in buffers[:-1]:
    571             stream.send(b, flag, copy=False)

/usr/lib/python2.7/dist-packages/zmq/core/pysocket.pyc in send_multipart(self, msg_parts, flags, copy, track)
    180         self.send(msg, SNDMORE|flags, copy=copy, track=track)
    181     # Send the last part without the extra SNDMORE flag.
--> 182     return self.send(msg_parts[-1], flags, copy=copy, track=track)
    183 
    184 def recv_multipart(self, flags=0, copy=True, track=False):

KeyboardInterrupt: 









    






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Content source: tyberion/piRowing

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