PCA9685 configured to take i2c commands from all addresses.

[ScottMonaghan]

I'm combining my PCA9685 with HT16K33 8x8 matrix.
As soon as I send a command to the HT1633 the PCA stops responding and all my connected servos go limp.

The solution for this issue was identified here: rwaldron/johnny-five#1591 (comment)

It appears the issue was fixed in the arduino library but not corrected in circuit python (see adafruit/Adafruit-PWM-Servo-Driver-Library@9f8e1dd#diff-5d1e3a5213c0ef6dedb2baf5cc323727L106-R110)

I confirmed the fix below works for me:
Change line 163 of adafruit_pca9685 in frequency(self, freq) from
self.mode1_reg = old_mode | 0xa1 # Mode 1, autoincrement on
to
self.mode1_reg = old_mode | 0xa0 # Mode 1, autoincrement on, fix to stop pca9685 from accepting commands at all addresses

I will submit a pull request with this change.

[ScottMonaghan]

Pull request here: #32