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stmhal: Fix a bug related to unhandled channel interrupts. 

This also cleans up spurious interrupts which happen at timer
initilaization time.
This commit is contained in:
Dave Hylands 2015-03-09 23:44:26 -07:00 committed by Damien George
parent 3cc17c69ff
commit 49d8e5ebaa
1 changed files with 15 additions and 3 deletions
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18
stmhal/timer.c
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@ -988,8 +988,17 @@ STATIC mp_obj_t pyb_timer_channel(mp_uint_t n_args, const mp_obj_t *pos_args, mp
&& self->tim.Instance != TIM8 ) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "encoder not supported on timer %d", self->tim_id));
}
// Disable & clear the timer interrupt so that we don't trigger
// an interrupt by initializing the timer.
__HAL_TIM_DISABLE_IT(&self->tim, TIM_IT_UPDATE);
HAL_TIM_Encoder_Init(&self->tim, &enc_config);
__HAL_TIM_SetCounter(&self->tim, 0);
if (self->callback != mp_const_none) {
__HAL_TIM_CLEAR_FLAG(&self->tim, TIM_IT_UPDATE);
__HAL_TIM_ENABLE_IT(&self->tim, TIM_IT_UPDATE);
}
HAL_TIM_Encoder_Start(&self->tim, TIM_CHANNEL_ALL);
break;
}
@ -1095,9 +1104,12 @@ STATIC mp_obj_t pyb_timer_callback(mp_obj_t self_in, mp_obj_t callback) {
__HAL_TIM_DISABLE_IT(&self->tim, TIM_IT_UPDATE);
self->callback = mp_const_none;
} else if (mp_obj_is_callable(callback)) {
__HAL_TIM_DISABLE_IT(&self->tim, TIM_IT_UPDATE);
self->callback = callback;
// start timer, so that it interrupts on overflow
HAL_TIM_Base_Start_IT(&self->tim);
// start timer, so that it interrupts on overflow, but clear any
// pending interrupts which may have been set by initializing it.
__HAL_TIM_CLEAR_FLAG(&self->tim, TIM_IT_UPDATE);
HAL_TIM_Base_Start_IT(&self->tim); // This will re-enable the IRQ
HAL_NVIC_EnableIRQ(self->irqn);
} else {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "callback must be None or a callable object"));
@ -1330,7 +1342,7 @@ void timer_irq_handler(uint tim_id) {
// Finally, clear any remaining interrupt sources. Otherwise we'll
// just get called continuously.
uint32_t unhandled = __HAL_TIM_GET_ITSTATUS(&tim->tim, 0xff & ~handled);
uint32_t unhandled = tim->tim.Instance->DIER & 0xff & ~handled;
if (unhandled != 0) {
__HAL_TIM_CLEAR_IT(&tim->tim, unhandled);
printf("Unhandled interrupt SR=0x%02lx (now disabled)\n", unhandled);