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 <[email protected]> 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 <[email protected]> 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 [email protected]. >>> 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 <[email protected]> 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 [email protected]. >>> 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 [email protected]. > 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 --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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