Commits on Jan 12, 2016

1. Implement variable PWM frequency …

   * Supports 1 Hz to 65535 Hz
   * User facing API: analogWrite(pin, value, pwm_frequency)
   * Calculate an approriate prescaler for the range of frequencies
   * Allow updating frequency on the fly
   * Add tests for PWM with frequency
   
   Other changes
   
   * Remove extern "C" from analogWrite to allow overloaded versions
   * Share pwm_hal for Core, Photon and Electron
   
   Bugfixes
   
   * Fix duty cycle initialization making a second Duty Cycle initialization unecessary
   
   I tested this change on a Photon, Core and Electron for all the PWM capable pins. I verified a range of frequencies and duty cycles from 1 Hz up to 60 kHz with a multimeter. It was always spot on.

   

   monkbroc committed Jan 12, 2016
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