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/*
* This file is part of the libopencm3_cpp_extensions project.
* hosted at http://github.com/thirdpin/libopencm3_cpp_extensions
*
* Copyright (C) 2016 Third Pin LLC
* Written by Anastasiia Lazareva <a.lazareva@thirdpin.ru>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
SYSTICK implementation, public interface
*/
#include "systick_ext.h"
#if ENABLE_CUSTOM_SYSTICK_SOURCE == 1
extern "C" {
void SYS_TICK_INT_FUNC(void);
}
#include "libopencm3/stm32/timer.h"
#endif
volatile uint32_t counter_ms;
void sys_tick_handler(void)
{
#if ENABLE_CUSTOM_SYSTICK_SOURCE == 1
if (timer_get_flag(INT_SOURCE, TIM_SR_UIF)) {
timer_clear_flag(INT_SOURCE, TIM_SR_UIF);
counter_ms++;
}
#else
counter_ms++;
#endif
}
void delay_nop(uint32_t count)
{
while(count--) {
__asm("nop");
}
}
void delay_ms(uint32_t ms)
{
uint32_t time = counter_ms;
while((counter_ms - time) < ms);
}
//by default sets up a timer to create 1ms ticks (div = 1000)
//at system clock 120mhz.
void systick_init(uint32_t div)
{
counter_ms = 0;
systick_set_reload(SYSTEM_CORE_CLOCK / div);
systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
systick_counter_enable();
systick_interrupt_enable();
}
uint32_t get_counter_ms()
{
return counter_ms;
}
TimerMs::TimerMs(TimerMode mode, uint32_t period_ms)
{
_mode = mode;
_saved_ms = get_counter_ms();
_period_ms = period_ms;
switch (_mode)
{
case CYCLE:
_is_active = true;
break;
case ONE_SHOT:
_is_active = false;
break;
}
}
bool TimerMs::timeout()
{
if (_is_active && ((counter_ms - _saved_ms) >= _period_ms)) {
switch (_mode)
{
case CYCLE:
_saved_ms = counter_ms;
return true;
case ONE_SHOT:
return true;
}
}
return false;
}
bool TimerMs::start()
{
if(_mode == CYCLE)
return false;
_saved_ms = counter_ms;
_is_active = true;
return true;
}
bool TimerMs::stop()
{
if(_mode == CYCLE)
return false;
_is_active = false;
return true;
}
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