diff options
Diffstat (limited to 'ports/stm32/timer.c')
| -rw-r--r-- | ports/stm32/timer.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/ports/stm32/timer.c b/ports/stm32/timer.c index f24c2e6bf..96a6baa02 100644 --- a/ports/stm32/timer.c +++ b/ports/stm32/timer.c @@ -620,6 +620,12 @@ STATIC mp_obj_t pyb_timer_init_helper(pyb_timer_obj_t *self, size_t n_args, cons #endif config_deadtime(self, args[6].u_int); } + + // Enable ARPE so that the auto-reload register is buffered. + // This allows to smoothly change the frequency of the timer. + self->tim.Instance->CR1 |= TIM_CR1_ARPE; + + // Start the timer running if (args[5].u_obj == mp_const_none) { HAL_TIM_Base_Start(&self->tim); } else { @@ -1121,10 +1127,6 @@ STATIC mp_obj_t pyb_timer_freq(size_t n_args, const mp_obj_t *args) { uint32_t prescaler = compute_prescaler_period_from_freq(self, args[1], &period); self->tim.Instance->PSC = prescaler; __HAL_TIM_SetAutoreload(&self->tim, period); - // Reset the counter to zero. Otherwise, if counter >= period it will - // continue counting until it wraps (at either 16 or 32 bits depending - // on the timer). - __HAL_TIM_SetCounter(&self->tim, 0); return mp_const_none; } } @@ -1155,10 +1157,6 @@ STATIC mp_obj_t pyb_timer_period(size_t n_args, const mp_obj_t *args) { } else { // set __HAL_TIM_SetAutoreload(&self->tim, mp_obj_get_int(args[1]) & TIMER_CNT_MASK(self)); - // Reset the counter to zero. Otherwise, if counter >= period it will - // continue counting until it wraps (at either 16 or 32 bits depending - // on the timer). - __HAL_TIM_SetCounter(&self->tim, 0); return mp_const_none; } } |