Correct PWM frequency prescale computation #59
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Assuming this datasheet https://www.digikey.be/htmldatasheets/production/1640697/0/0/1/pca9685-datasheet.html#pf19 is correct, the prescale value computation is off by one. Prior to this change a PWM frequency of about 2 kHz could be set, and would be reported. After this change a maximum PWM frequency of 1526 Hz is accepted and reported, consistent with the datasheet.
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Updating https://github.com/adafruit/Adafruit_CircuitPython_24LC32 to 1.1.0 from 1.0.12: > Merge pull request adafruit/Adafruit_CircuitPython_24LC32#23 from TonyLHansen/main Updating https://github.com/adafruit/Adafruit_CircuitPython_ADT7410 to 2.0.0 from 1.3.13: > Merge pull request adafruit/Adafruit_CircuitPython_ADT7410#24 from jposada202020/improving_lib Updating https://github.com/adafruit/Adafruit_CircuitPython_CLUE to 3.1.0 from 3.0.17: > Merge pull request adafruit/Adafruit_CircuitPython_CLUE#61 from prcutler/root-group-fix Updating https://github.com/adafruit/Adafruit_CircuitPython_PCA9685 to 3.4.14 from 3.4.13: > Merge pull request adafruit/Adafruit_CircuitPython_PCA9685#59 from bdlucas1/main Updating https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO to 5.8.1 from 5.8.0: > Merge pull request adafruit/Adafruit_CircuitPython_AdafruitIO#114 from kavinaidoo/main Updating https://github.com/adafruit/Adafruit_CircuitPython_asyncio to 1.3.0 from 1.2.2: > Merge pull request adafruit/Adafruit_CircuitPython_asyncio#59 from imnotjames/chore/optional-traceback Updating https://github.com/adafruit/Adafruit_CircuitPython_PyCamera to 0.0.7 from 0.0.6: > Merge pull request adafruit/Adafruit_CircuitPython_PyCamera#15 from adafruit/enhancements > Merge pull request adafruit/Adafruit_CircuitPython_PyCamera#13 from brentru/allow-jpg-save Updating https://github.com/adafruit/Adafruit_CircuitPython_TemplateEngine to 1.1.0 from 1.0.1: > Merge pull request adafruit/Adafruit_CircuitPython_TemplateEngine#2 from michalpokusa/removing-8-x-x-re-module-bug-workarounds Updating https://github.com/adafruit/Adafruit_CircuitPython_Bundle/circuitpython_library_list.md to NA from NA: > Updated download stats for the libraries
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Assuming this datasheet https://www.digikey.be/htmldatasheets/production/1640697/0/0/1/pca9685-datasheet.html#pf19 is correct, the prescale value computation is off by one. This results in the incorrect PWM frequency being selected, and the incorrect frequency being reported on reading back the frequency field. For example