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/*
* Copyright 2020 Daniel Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "arch.h"
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>
void Arch::setup(void)
{
wdt_disable();
#if F_CPU == 16000000UL
/* default */
#elif F_CPU == 8000000UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS0);
#elif F_CPU == 4000000UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS1);
#elif F_CPU == 2000000UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS1) | _BV(CLKPS0);
#elif F_CPU == 1000000UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS2);
#elif F_CPU == 500000UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS2) | _BV(CLKPS0);
#elif F_CPU == 250000UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS2) | _BV(CLKPS1);
#elif F_CPU == 125000UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS2) | _BV(CLKPS1) | _BV(CLKPS0);
#elif F_CPU == 62500UL
CLKPR = _BV(CLKPCE);
CLKPR = _BV(CLKPS3);
#else
#error Unsupported F_CPU
#endif
#if defined(CONFIG_loop) || defined(TIMER_S)
TCCR1A = 0;
TCCR1B = _BV(WGM12) | _BV(CS12) | _BV(CS10); // /1024
OCR1A = F_CPU / 1024;
TIMSK1 = _BV(OCIE1A);
#endif
#ifdef TIMER_US
#if F_CPU != 16000000UL
#error TIMER_US is only supported with F_CPU = 16MHz
#endif
// 16MHz/8 -> 2MHz timer
TCCR2A = 0;
TCCR2B = _BV(CS21);
#endif
sei();
}
#ifdef CONFIG_wakeup
void wakeup();
#endif
#if defined(CONFIG_loop) || defined(TIMER_S)
#include "driver/uptime.h"
#endif
#if defined(CONFIG_loop)
extern void loop();
volatile char run_loop = 0;
#endif
void Arch::idle_loop(void)
{
while (1) {
SMCR = _BV(SE);
asm("sleep");
SMCR = 0;
asm("wdr");
#ifdef CONFIG_loop
if (run_loop) {
loop();
run_loop = 0;
}
#endif
#ifdef CONFIG_wakeup
wakeup();
#endif
}
}
void Arch::idle(void)
{
SMCR = _BV(SE);
asm("sleep");
SMCR = 0;
asm("wdr");
}
void Arch::delay_us(unsigned int const us)
{
for (unsigned int i = 0; i < us; i++) {
_delay_us(1);
}
}
void Arch::delay_ms(unsigned int const ms)
{
for (unsigned int i = 0; i < ms; i++) {
_delay_ms(1);
}
}
Arch arch;
#if defined(CONFIG_loop) || defined(TIMER_S)
#ifndef __acweaving
ISR(TIMER1_COMPA_vect)
{
#ifdef CONFIG_loop
run_loop = 1;
#endif
#ifdef TIMER_S
uptime.tick_s();
#endif
}
#endif
#endif
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