The intervals after which the duty

The intervals after which the duty cycle is updated for the PIO_MOTOR
* signal, in microseconds.
*
* Setting it to (NUMBER_OF_STEPS/32768) seconds would change the duty cycle
* after one complete pulse cycle, since each cycle consists of as many steps
* as NUMBER_OF_STEPS and each step takes (1/32768) seconds. */


The total number of steps when incrementing the duty cycle. This value
* has range 1 to 255. It determines the frequency (or time period)
* of the PWM waveform generated; lower the value higher the frequency */

Initialise UART communications

/* Pulse timings for the dullest part of the sequence:
* dullest part of the sequence has the pulse off for the whole
* period, in effect the line stays low for the duration for which
* the dullest part of the sequence lasts. */
0, /* ON time for the pulse is 0us */
255, /* OFF time for the pulse is (255 * 30)us */
62, /* Dullest part of the sequence lasts for
( 62 * 16 )ms before ramping up to the brightest
part of the sequence */

/* Pulse timings for the brightest part of the sequence:
* brightest part of the sequence has the pulse ON for the whole
* period, in effect the line stays high for the duration for which
* the brightest part of the sequence lasts. */
255, /* ON time for the pulse is (255 * 30)us */
0, /* OFF time for the pulse is 0us */
62, /* Brightest part of the sequence lasts for
( 62 * 16 )ms before ramping down to the dullest
part of the sequence */

/* Ramping between dullest and brightest parts of the sequence
* This parameter determines the duration for which the ramping
* lasts when going from dullest to the brightest (and vice-versa).
*
* The total duration for which the ramping lasts is determined by
* multiplying this value with one less than the difference between
* the on_time or off_time of the two states, whichever is bigger;
* in the units of 30us
* */
132 /* Ramping lasts for ((255-1) * 132 * 30)us */

Duration for which the first part of the sequence lasts for
* in units of 16ms. Since a fixed frequency waveform is
* produced, both parts of the sequence contain identical
* pulses. As ramping will not enabled for this PWM, the
* output switches from the first part of the sequence to
* the second part instantaneously. Since they are identical,
* the switching doesn't have any effect and hence the duration
* for which the first or second part of the sequence last
* doesn't really matter. We simply choose a non-zero value. */


/* ON time for the pulses during the second part of the
* sequence is also (value * 30)us */


pwm_id the index (0-3) of the PWM unit to be configured.
mode the operating mode (pio_pwm_mode) of the PIO pins used.
dull_off_time the amount of time, in units of ~30us, for which the LED should be off during the dullest part of the flash sequence.

dull_on_time the amount of time, in units of ~30us, for which the LED should be on during the dullest part of the flash sequence.
dull_hold_time the amount of time, in units of ~16ms, for which the LED should be held in the dullest part of the flash sequence.
bright_off_time the amount of time, in units of ~30us, for which the LED should be off during the brightest part of the flash sequence.
bright_on_time the amount of time, in units of ~30us, for which the LED should be on during the brightest part of the flash sequence.
bright_hold_time the amount of time, in units of ~16ms, for which the LED should be held in the brightest part of the flash sequence.
ramp_rate the ramp rate for ramping between brightness levels, in units of ~30us per step with 0 being instantaneous (no ramp).


Enumerations