Added wave_create_and_pad to pigpio.py

pigpio.py

@@ -571,6 +571,7 @@ _PI_CMD_EVM  =115
 _PI_CMD_EVT  =116
 
 _PI_CMD_PROCU=117
+_PI_CMD_WVCAP=118
 
 # pigpio error numbers
 
@@ -2304,6 +2305,42 @@ class pi():
       """
       return _u2i(_pigpio_command(self.sl, _PI_CMD_WVCRE, 0, 0))
 
+   def wave_create_and_pad(self, percent):
+      """
+      This function creates a waveform like wave_create but pads the consumed
+      resources. Where percent gives the percentage of the resources to use (in terms
+      of the theoretical maximum, not the current amount free). This allows the reuse 
+      of deleted waves while a transmission is active. Upon success a wave id
+      greater than or equal to 0 is returned, otherwise PI_EMPTY_WAVEFORM,
+      PI_TOO_MANY_CBS, PI_TOO_MANY_OOL, or PI_NO_WAVEFORM_ID.
+
+      . .
+      pi: >=0 (as returned by [*pigpio_start*]).
+      . .
+
+      The data provided by the [*wave_add_**] functions is consumed by this
+      function.
+
+      As many waveforms may be created as there is space available. The
+      wave id is passed to [*wave_send_**] to specify the waveform to transmit.
+
+      A usage would be the creation of two waves where one is filled while the other
+      is beeing transmitted. Each wave is assigned 50% of the available resources.
+      This buffer structure allows the transmission of infinite wave sequences.
+
+      Step 1. [*wave_clear*] to clear all waveforms and added data.
+
+      Step 2. [*wave_add_**] calls to supply the waveform data.
+
+      Step 3. [*wave_create_and_pad*] to create a 50% padded waveform and get a unique id
+
+      Step 4. [*wave_send_**] with the id of the waveform to transmit.
+
+      Repeat steps 2-4 as needed always waiting for the active waveform to be transmitted
+      before marking it as deleted.
+      """
+      return _u2i(_pigpio_command(self.sl, _PI_CMD_WVCAP, percent, 0))
+
    def wave_delete(self, wave_id):
       """
       This function deletes the waveform with id wave_id.