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sched: Support adding timers to the start of timer_list

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If sched_add_timer() is called on a timer that would make it the new
head of the list, then add it and signal the board code that the timer
should be rescheduled.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-07-27 12:19:09 -04:00
parent 62f77f6bc5
commit 6a63c27542
7 changed files with 62 additions and 45 deletions
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16
src/avr/timer.c
View file

@ -1,6 +1,6 @@
// AVR timer interrupt scheduling code.
//
// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2016,2017 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@ -10,7 +10,7 @@
#include "board/misc.h" // timer_from_us
#include "command.h" // shutdown
#include "irq.h" // irq_save
#include "sched.h" // sched_timer_kick
#include "sched.h" // sched_timer_dispatch
/****************************************************************
@ -77,16 +77,13 @@ timer_repeat_set(uint16_t next)
TIFR1 = 1<<OCF1B;
}
// Reset the timer - clear settings and dispatch next timer immediately
// Activate timer dispatch as soon as possible
void
timer_reset(void)
timer_kick(void)
{
uint16_t now = timer_get();
timer_set(now + 50);
timer_set(timer_get() + 50);
TIFR1 = 1<<OCF1A;
timer_repeat_set(now + 50);
}
DECL_SHUTDOWN(timer_reset);
void
timer_init(void)
@ -97,7 +94,8 @@ timer_init(void)
TCCR1B = 1<<CS10;
// Setup for first irq
irqstatus_t flag = irq_save();
timer_reset();
timer_kick();
timer_repeat_set(timer_get() + 50);
TIFR1 = 1<<TOV1;
// enable interrupt
TIMSK1 = 1<<OCIE1A;