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#include <stdbool.h>
#include <avr/sleep.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include "suspend.h"
#include "action.h"
#include "timer.h"
#ifdef PROTOCOL_LUFA
# include "lufa.h"
#endif
#ifdef PROTOCOL_VUSB
# include "vusb.h"
#endif
// TODO: This needs some cleanup
#if !defined(NO_SUSPEND_POWER_DOWN) && defined(WDT_vect)
// clang-format off
#define wdt_intr_enable(value) \
__asm__ __volatile__ ( \
"in __tmp_reg__,__SREG__" "\n\t" \
"cli" "\n\t" \
"wdr" "\n\t" \
"sts %0,%1" "\n\t" \
"out __SREG__,__tmp_reg__" "\n\t" \
"sts %0,%2" "\n\t" \
: /* no outputs */ \
: "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
"r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
"r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | _BV(WDIE) | (value & 0x07))) \
: "r0" \
)
// clang-format on
/** \brief Power down MCU with watchdog timer
*
* wdto: watchdog timer timeout defined in <avr/wdt.h>
* WDTO_15MS
* WDTO_30MS
* WDTO_60MS
* WDTO_120MS
* WDTO_250MS
* WDTO_500MS
* WDTO_1S
* WDTO_2S
* WDTO_4S
* WDTO_8S
*/
static uint8_t wdt_timeout = 0;
/** \brief Power down
*
* FIXME: needs doc
*/
static void power_down(uint8_t wdto) {
wdt_timeout = wdto;
// Watchdog Interrupt Mode
wdt_intr_enable(wdto);
// TODO: more power saving
// See PicoPower application note
// - I/O port input with pullup
// - prescale clock
// - BOD disable
// - Power Reduction Register PRR
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable();
sei();
sleep_cpu();
sleep_disable();
// Disable watchdog after sleep
wdt_disable();
}
/* watchdog timeout */
ISR(WDT_vect) {
// compensate timer for sleep
switch (wdt_timeout) {
case WDTO_15MS:
timer_count += 15 + 2; // WDTO_15MS + 2(from observation)
break;
default:;
}
}
#endif
/** \brief Suspend power down
*
* FIXME: needs doc
*/
void suspend_power_down(void) {
#ifdef PROTOCOL_LUFA
if (USB_DeviceState == DEVICE_STATE_Configured) return;
#endif
#ifdef PROTOCOL_VUSB
if (!vusb_suspended) return;
#endif
suspend_power_down_quantum();
#ifndef NO_SUSPEND_POWER_DOWN
// Enter sleep state if possible (ie, the MCU has a watchdog timeout interrupt)
# if defined(WDT_vect)
power_down(WDTO_15MS);
# endif
#endif
}
/** \brief run immediately after wakeup
*
* FIXME: needs doc
*/
void suspend_wakeup_init(void) {
// clear keyboard state
clear_keyboard();
suspend_wakeup_init_quantum();
}
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