diff options
| -rw-r--r-- | shared-bindings/pulseio/PWMOut.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/shared-bindings/pulseio/PWMOut.c b/shared-bindings/pulseio/PWMOut.c index 40981e0a8..53b88c61a 100644 --- a/shared-bindings/pulseio/PWMOut.c +++ b/shared-bindings/pulseio/PWMOut.c @@ -162,6 +162,11 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pulseio_pwmout___exit___obj, 4, 4, pu //| 16 bit value that dictates how much of one cycle is high (1) versus low //| (0). 0xffff will always be high, 0 will always be low and 0x7fff will //| be half high and then half low. +//| +//| Depending on how PWM is implemented on a specific board, the internal +//| representation for duty cycle might have less than 16 bits of resolution. +//| Reading this property will return the value from the internal representation, +//| so it may differ from the value set. STATIC mp_obj_t pulseio_pwmout_obj_get_duty_cycle(mp_obj_t self_in) { pulseio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in); check_for_deinit(self); @@ -193,6 +198,12 @@ const mp_obj_property_t pulseio_pwmout_duty_cycle_obj = { //| 32 bit value that dictates the PWM frequency in Hertz (cycles per //| second). Only writeable when constructed with ``variable_frequency=True``. //| +//| Depending on how PWM is implemented on a specific board, the internal value +//| for the PWM's duty cycle may need to be recalculated when the frequency +//| changes. In these cases, the duty cycle is automatically recalculated +//| from the original duty cycle value. This should happen without any need +//| to manually re-set the duty cycle. +//| STATIC mp_obj_t pulseio_pwmout_obj_get_frequency(mp_obj_t self_in) { pulseio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in); check_for_deinit(self); |