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Small improvements to timer module.

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This commit is contained in:
Damien 2013-11-09 11:29:49 +00:00
parent bd8e110207
commit 6d42ab6625
1 changed files with 10 additions and 4 deletions
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14
stm/timer.c
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@ -24,7 +24,11 @@ py_obj_t timer_py_set_callback(py_obj_t f) {
py_obj_t timer_py_set_period(py_obj_t period) {
TIM6->ARR = py_obj_get_int(period) & 0xffff;
//TIM6->PSC = prescaler & 0xffff;
return py_const_none;
}
py_obj_t timer_py_set_prescaler(py_obj_t prescaler) {
TIM6->PSC = py_obj_get_int(prescaler) & 0xffff;
return py_const_none;
}
@ -38,12 +42,12 @@ void timer_init(void) {
// TIM6 clock enable
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
// Compute the prescaler value so TIM6 runs at 10kHz
uint16_t PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 10000) - 1;
// Compute the prescaler value so TIM6 runs at 20kHz
uint16_t PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 20000) - 1;
// Time base configuration
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 10000; // timer cycles at 1Hz
TIM_TimeBaseStructure.TIM_Period = 20000; // timer cycles at 1Hz
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0; // unused for TIM6
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // unused for TIM6
@ -70,6 +74,7 @@ void timer_init(void) {
py_obj_t m = py_module_new();
rt_store_attr(m, qstr_from_str_static("callback"), rt_make_function_1(timer_py_set_callback));
rt_store_attr(m, qstr_from_str_static("period"), rt_make_function_1(timer_py_set_period));
rt_store_attr(m, qstr_from_str_static("prescaler"), rt_make_function_1(timer_py_set_prescaler));
rt_store_attr(m, qstr_from_str_static("value"), rt_make_function_0(timer_py_get_value));
rt_store_name(qstr_from_str_static("timer"), m);
}
@ -78,6 +83,7 @@ void timer_interrupt(void) {
if (timer_py_callback != py_const_none) {
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
// XXX what to do if the GC is in the middle of running??
rt_call_function_0(timer_py_callback);
nlr_pop();
} else {