From 1f3887dc28a7ee1f5671fcc194930fa33a60ece5 Mon Sep 17 00:00:00 2001 From: Henrik Sölver Date: Thu, 13 Apr 2017 21:38:17 +0200 Subject: stmhal/timer: Clear interrupt flag before setting callback. Sometimes when setting a channel callback the callback fires immediately, even if the compare register is set to a value far into the future. This happens when the free running counter has previously been equal to what happens to be in the compare register. This patch make sure that there is no pending interrupt when setting a callback. --- stmhal/timer.c | 1 + 1 file changed, 1 insertion(+) (limited to 'stmhal/timer.c') diff --git a/stmhal/timer.c b/stmhal/timer.c index 7f0a70c5e8..5a574867b6 100644 --- a/stmhal/timer.c +++ b/stmhal/timer.c @@ -1302,6 +1302,7 @@ STATIC mp_obj_t pyb_timer_channel_callback(mp_obj_t self_in, mp_obj_t callback) } else if (mp_obj_is_callable(callback)) { self->callback = callback; uint8_t tim_id = self->timer->tim_id; + __HAL_TIM_CLEAR_IT(&self->timer->tim, TIMER_IRQ_MASK(self->channel)); if (tim_id == 1) { HAL_NVIC_EnableIRQ(TIM1_CC_IRQn); #if defined(TIM8) // STM32F401 doesn't have a TIM8 -- cgit v1.2.3