finalizing servo, softpwm, and pwm api docs, cleanup of code comments for #73

docs/softpwm.md

@@ -18,4 +18,115 @@ Enable/Disable the Debug
   SPWM.toggle_debug()
   ```
 
+### is_chip_pro()
+Function to report to the calling script if the SBC is a CHIP or a CHIP Pro
+
+* Parameters
+  
+  None
+
+* Returns
+
+  int - 1 for CHIP Pro, 0 for CHIP
+
+* Examples
+
+  ```python
+  is_chip_pro = SPWM.is_chip_pro()
+  ```
+
+### start(channel, duty_cycle=0.0, frequency=2000.0, polarity=0)
+Start the Software PWM
+
+* Parameters
+  
+  channel - pin for software PWM is configured 
+  duty_cycle - initial duty cycle of the PWM (optional)
+  frequency - frequency of the PWM (optional)
+  polarity - signal polarity of the PWM (optional)
+
+* Returns
+
+  None
+
+* Examples
+
+  ```python
+  SPWM.start("CSID0")
+  SPWM.start("CSID0", 37.0)
+  SPWM.start("CSID0", 10.0, 500.0)
+  SPWM.start("CSID0", 50.0, 1000.0, 1)
+  ```
+
+### stop(channel)
+Stop the Software PWM
+
+* Parameters
+  
+  channel - pin software PWM is configured 
+
+* Returns
+
+  None
+
+* Examples
+
+  ```python
+  SPWM.stop("CSID0")
+  ```
+
+### set_duty_cycle(channel, duty_cycle)
+Set the duty cycle of the Software PWM
+
+* Parameters
+  
+  channel - pin software PWM is configured 
+  duty_cycle - duty cycle of the PWM (0.0 to 100.0)
+
+* Returns
+
+  None
+
+* Examples
+
+  ```python
+  SPWM.set_duty_cycle("CSID0", 25.0)
+  ```
+
+### set_frequency(channel, frequency)
+Set the frequency of the Software PWM in Hertz
+
+* Parameters
+  
+  channel - pin PWM is configured
+  frequency - frequency of the PWM
+
+* Returns
+
+  None
+
+* Examples
+
+  ```python
+  SPWM.set_frequency("CSID0", 450.0)
+  ```
+
+### cleanup(channel)
+Cleanup Software PWM.  If not channel input, all Software PWM will be cleaned up
+
+* Parameters
+  
+  channel - pin Software PWM is configured (optional)
+
+* Returns
+
+  None
+
+* Examples
+
+  ```python
+  SPWM.cleanup()
+  SPWM.cleanup("CSID0")
+  ```
+
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