When you call the methods in the Pca9685 you need to pass the appropriate
parameters.
Ex:
read_reg( self, reg )
You need to pass a reg value to this.
* reg_val = some_reg_val*
* read_result = x.read_reg(reg_val) *
* print(read_result)*
I can't see the rest of your code so I am not sure if it will work or not.
Search the web for Python3 tutorials.
Jon
On Tue, May 5, 2020 at 3:01 PM Mala Dies <fun...@gmail.com> wrote:
> Hello,
>
> Okay.
>
> So, I am using smbus2 in python3 for the communication of the i2c
> interface on the ServoCape (PCA9685).
>
> So:
>
> from smbus2 import SMBus
> from ServoLib import Pca9685
> from time import sleep
>
>
> i2c2 = SMBus("/dev/i2c-2")
> x = Pca9685(i2c2, 0b111111)
>
> So, everything under this first section of my python source should work as
> described:
>
> x.__init__
> x.read_reg
> x.write_reg
> x.read_regs
> x.write_regs
> x.get_pwm
> x.set_pwm
>
>
> Is this correct?
>
> Seth
>
>
>
> On Tuesday, May 5, 2020 at 4:09:33 PM UTC-5, jonnymo wrote:
>>
>> If you provide a link to the source of this that would help.
>>
>> But, basically in your own Python code you would first import the class
>>
>> Ex:
>> * from source_file import Pca9685*
>>
>> The you could create an instance of this like:
>>
>> * my_servo_control = Pca9685(bus_num, addr_val)*
>>
>> You could need to know the value of bus_num and addr_val to set these.
>>
>> Then you could call the methods as such:
>> *my_servo_control.read_reg(reg_val)*
>>
>> Again, you would need to know what the value of reg_val is to set the
>> 'reg' parameter for the 'read_reg' method.
>>
>> You still need to know where it is getting the '*write_i2c_block_data*'
>> and *'read_i2c_block_data*' methods from though.
>> Perhaps 'import smbus' is missing?
>>
>> https://learn.sparkfun.com/tutorials/python-programming-tutorial-getting-started-with-the-raspberry-pi/experiment-4-i2c-temperature-sensor
>>
>>
>> A course in Python wouldn't hurt.
>>
>>
>> Cheers,
>>
>> Jon
>>
>>
>> On Tue, May 5, 2020 at 1:29 PM Mala Dies <fun...@gmail.com> wrote:
>>
>>> Hello,
>>>
>>> I have a, to me, piece of complicated text in Python3 format.
>>>
>>> Anyway...
>>>
>>> I have been unable to make the conversion of the wrapper to another
>>> Python3 file.
>>>
>>> So, here is the source in case you are interested:
>>>
>>> from time import sleep
>>>
>>> # relevant registers
>>> MODE1 = 0x00
>>> MODE2 = 0x01
>>> LED = 0x06
>>> ALL_LED = 0xFA
>>> PRE_SCALE = 0xFE
>>>
>>> class Pca9685:
>>> def __init__( self, bus, addr ):
>>> self.addr = 0b10000000 | addr
>>> self.bus = bus
>>> self.write_reg( MODE1, 1 << 5 ) # initialize MODE1 register
>>> sleep( 500e-6 ) # wait 500us to allow oscillator to power up
>>>
>>> def read_reg( self, reg )
>>> return self.read_regs( reg, 1 )[0]
>>>
>>> def write_reg( self, reg, value ):
>>> return self.write_regs( reg, [ value ] )
>>>
>>> def read_regs( self, reg, count ):
>>> assert reg in range( 0, 256 )
>>> assert count in range( 1, 257-reg )
>>> return self.bus.read_i2c_block_data( self.addr, reg, count )
>>>
>>> def write_regs( self, reg, values ):
>>> assert reg in range( 0, 256 )
>>> return self.bus.write_i2c_block_data( self.addr, reg, values )
>>>
>>> def get_pwm( self, output ):
>>> assert output in range( 0, 16 )
>>> reg = LED + 4 * output
>>>
>>> [ on_l, on_h, off_l, off_h ] = self.read_regs( reg, 4 )
>>> on = on_l | on_h << 8
>>> off = off_l | off_h << 8
>>>
>>> phase = on
>>> duty = ( off - on ) & 0xfff
>>> if off & 0x1000:
>>> duty = 0
>>> elif on & 0x1000:
>>> duty = 4096
>>>
>>> return ( duty, phase )
>>>
>>> def set_pwm( self, output, duty, phase=0 ):
>>> assert duty in range( 0, 4097 )
>>> assert phase in range( 0, 4096 )
>>>
>>> if output == 'all':
>>> reg = ALL_LED
>>> else:
>>> assert output in range( 0, 16 )
>>> reg = LED + 4 * output
>>>
>>> on = phase
>>> off = ( duty + phase ) & 0xfff
>>> if duty == 0:
>>> off |= 0x1000
>>> elif duty == 4096:
>>> on |= 0x1000
>>>
>>> on_l = on & 0xff
>>> on_h = on >> 8
>>> off_l = off & 0xff
>>> off_h = off >> 8
>>> self.write_regs( reg, [ on_l, on_h, off_l, off_h ] )
>>>
>>> Now...
>>>
>>> How would I actually use this source to promote a servo movement with
>>> the ServoCape?
>>>
>>> I have tried particular source from different tutorials, the python.org
>>> site, and examples of classes online.
>>>
>>> None really cover the BBB and expansion Capes like this source is
>>> listed. Anyway...
>>>
>>> What steps if any would you take to make a servo move w/ this Cape and
>>> source?
>>>
>>>
>>> - Would I need a Adafruit_BBIO library for GPIO/PWM or a similar
>>> library?
>>>
>>> Seth
>>>
>>> --
>>> For more options, visit http://beagleboard.org/discuss
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "BeagleBoard" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to beagl...@googlegroups.com.
>>> To view this discussion on the web visit
>>> https://groups.google.com/d/msgid/beagleboard/5e42131b-733f-413d-91e9-eb204e204f84%40googlegroups.com
>>> <https://groups.google.com/d/msgid/beagleboard/5e42131b-733f-413d-91e9-eb204e204f84%40googlegroups.com?utm_medium=email&utm_source=footer>
>>> .
>>>
>>
> On Tuesday, May 5, 2020 at 4:09:33 PM UTC-5, jonnymo wrote:
>>
>> If you provide a link to the source of this that would help.
>>
>> But, basically in your own Python code you would first import the class
>>
>> Ex:
>> * from source_file import Pca9685*
>>
>> The you could create an instance of this like:
>>
>> * my_servo_control = Pca9685(bus_num, addr_val)*
>>
>> You could need to know the value of bus_num and addr_val to set these.
>>
>> Then you could call the methods as such:
>> *my_servo_control.read_reg(reg_val)*
>>
>> Again, you would need to know what the value of reg_val is to set the
>> 'reg' parameter for the 'read_reg' method.
>>
>> You still need to know where it is getting the '*write_i2c_block_data*'
>> and *'read_i2c_block_data*' methods from though.
>> Perhaps 'import smbus' is missing?
>>
>> https://learn.sparkfun.com/tutorials/python-programming-tutorial-getting-started-with-the-raspberry-pi/experiment-4-i2c-temperature-sensor
>>
>>
>> A course in Python wouldn't hurt.
>>
>>
>> Cheers,
>>
>> Jon
>>
>>
>> On Tue, May 5, 2020 at 1:29 PM Mala Dies <fun...@gmail.com> wrote:
>>
>>> Hello,
>>>
>>> I have a, to me, piece of complicated text in Python3 format.
>>>
>>> Anyway...
>>>
>>> I have been unable to make the conversion of the wrapper to another
>>> Python3 file.
>>>
>>> So, here is the source in case you are interested:
>>>
>>> from time import sleep
>>>
>>> # relevant registers
>>> MODE1 = 0x00
>>> MODE2 = 0x01
>>> LED = 0x06
>>> ALL_LED = 0xFA
>>> PRE_SCALE = 0xFE
>>>
>>> class Pca9685:
>>> def __init__( self, bus, addr ):
>>> self.addr = 0b10000000 | addr
>>> self.bus = bus
>>> self.write_reg( MODE1, 1 << 5 ) # initialize MODE1 register
>>> sleep( 500e-6 ) # wait 500us to allow oscillator to power up
>>>
>>> def read_reg( self, reg )
>>> return self.read_regs( reg, 1 )[0]
>>>
>>> def write_reg( self, reg, value ):
>>> return self.write_regs( reg, [ value ] )
>>>
>>> def read_regs( self, reg, count ):
>>> assert reg in range( 0, 256 )
>>> assert count in range( 1, 257-reg )
>>> return self.bus.read_i2c_block_data( self.addr, reg, count )
>>>
>>> def write_regs( self, reg, values ):
>>> assert reg in range( 0, 256 )
>>> return self.bus.write_i2c_block_data( self.addr, reg, values )
>>>
>>> def get_pwm( self, output ):
>>> assert output in range( 0, 16 )
>>> reg = LED + 4 * output
>>>
>>> [ on_l, on_h, off_l, off_h ] = self.read_regs( reg, 4 )
>>> on = on_l | on_h << 8
>>> off = off_l | off_h << 8
>>>
>>> phase = on
>>> duty = ( off - on ) & 0xfff
>>> if off & 0x1000:
>>> duty = 0
>>> elif on & 0x1000:
>>> duty = 4096
>>>
>>> return ( duty, phase )
>>>
>>> def set_pwm( self, output, duty, phase=0 ):
>>> assert duty in range( 0, 4097 )
>>> assert phase in range( 0, 4096 )
>>>
>>> if output == 'all':
>>> reg = ALL_LED
>>> else:
>>> assert output in range( 0, 16 )
>>> reg = LED + 4 * output
>>>
>>> on = phase
>>> off = ( duty + phase ) & 0xfff
>>> if duty == 0:
>>> off |= 0x1000
>>> elif duty == 4096:
>>> on |= 0x1000
>>>
>>> on_l = on & 0xff
>>> on_h = on >> 8
>>> off_l = off & 0xff
>>> off_h = off >> 8
>>> self.write_regs( reg, [ on_l, on_h, off_l, off_h ] )
>>>
>>> Now...
>>>
>>> How would I actually use this source to promote a servo movement with
>>> the ServoCape?
>>>
>>> I have tried particular source from different tutorials, the python.org
>>> site, and examples of classes online.
>>>
>>> None really cover the BBB and expansion Capes like this source is
>>> listed. Anyway...
>>>
>>> What steps if any would you take to make a servo move w/ this Cape and
>>> source?
>>>
>>>
>>> - Would I need a Adafruit_BBIO library for GPIO/PWM or a similar
>>> library?
>>>
>>> Seth
>>>
>>> --
>>> For more options, visit http://beagleboard.org/discuss
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "BeagleBoard" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to beagl...@googlegroups.com.
>>> To view this discussion on the web visit
>>> https://groups.google.com/d/msgid/beagleboard/5e42131b-733f-413d-91e9-eb204e204f84%40googlegroups.com
>>> <https://groups.google.com/d/msgid/beagleboard/5e42131b-733f-413d-91e9-eb204e204f84%40googlegroups.com?utm_medium=email&utm_source=footer>
>>> .
>>>
>> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to beagleboard+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/beagleboard/0a7798ae-13f3-453b-9963-78290a9c005f%40googlegroups.com
> <https://groups.google.com/d/msgid/beagleboard/0a7798ae-13f3-453b-9963-78290a9c005f%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
--
For more options, visit http://beagleboard.org/discuss
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