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working on the scheduling offset logic

partial-rewrite
Ben Blazak 2013-05-25 12:20:41 -07:00
parent db74d1b26a
commit 79cda0e3c4
1 changed files with 13 additions and 5 deletions
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18
firmware/lib/timer/device/atmega32u4.c
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@ -29,10 +29,13 @@
static volatile uint16_t _milliseconds__counter;
static list__list_t * _milliseconds__scheduled_events = &(list__list_t){};
// since we won't be running scheduled events every "tick"
static uint8_t _milliseconds__last_ticked;
// ----------------------------------------------------------------------------
uint8_t timer__init(void) {
OCR0A = 250; // (ticks per millisecond)
OCR0A = 250; // (ticks per millisecond (hardware timer))
TCCR0A = 0b00000010; // (configure Timer/Counter 0)
TCCR0B = 0b00000011; // (configure Timer/Counter 0)
@ -46,18 +49,23 @@ uint16_t timer__get_milliseconds(void) {
}
uint8_t timer__schedule_milliseconds(uint16_t ticks, void(*function)(void)) {
uint8_t elapsed = timer__get_milliseconds() - _milliseconds__last_ticked;
// - use `ticks+elapsed` to compensate for ticks that haven't been counted
// yet, but should have (if we were ticking in real time)
return event_list__append(
_milliseconds__scheduled_events, ticks, function );
_milliseconds__scheduled_events, ticks+elapsed, function );
}
void timer___tick_milliseconds(void) {
static uint8_t _milliseconds__last_ticked;
uint8_t elapsed = timer__get_milliseconds() - _milliseconds__last_ticked;
// - update before ticking: if an event reschedules itself to run in 1
// tick, it should execute on the next tick without having to wait
_milliseconds__last_ticked += elapsed;
for (uint8_t i=0; i<elapsed; i++)
event_list__tick(_milliseconds__scheduled_events);
_milliseconds__last_ticked += elapsed;
}
ISR(TIMER0_COMPA_vect) {