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tmk_keyboard/common/avr/suspend.c

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#include <stdbool.h>
#include <avr/sleep.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
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#include "matrix.h"
#include "action.h"
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#include "backlight.h"
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#include "suspend_avr.h"
#include "suspend.h"
#ifdef PROTOCOL_LUFA
#include "lufa.h"
#endif
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#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" \
)
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void suspend_idle(uint8_t time)
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{
cli();
set_sleep_mode(SLEEP_MODE_IDLE);
sleep_enable();
sei();
sleep_cpu();
sleep_disable();
}
/* 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
*/
void suspend_power_down(uint8_t wdto)
{
#ifdef PROTOCOL_LUFA
if (USB_DeviceState == DEVICE_STATE_Configured) return;
#endif
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// Watchdog Interrupt Mode
wdt_intr_enable(wdto);
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// TODO: more power saving
// See PicoPower application note
// - I/O port input with pullup
// - prescale clock
// - BOD disable
// - Power Reduction Register PRR
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set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_enable();
sei();
sleep_cpu();
sleep_disable();
// Disable watchdog after sleep
wdt_disable();
}
bool suspend_wakeup_condition(void)
{
matrix_power_up();
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matrix_scan();
matrix_power_down();
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for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
if (matrix_get_row(r)) return true;
}
return false;
}
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// run immediately after wakeup
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void suspend_wakeup_init(void)
{
// clear keyboard state
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clear_keyboard();
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#ifdef BACKLIGHT_ENABLE
backlight_init();
#endif
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}
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#ifndef NO_SUSPEND_POWER_DOWN
/* watchdog timeout */
ISR(WDT_vect)
{
/* wakeup from MCU sleep mode */
/*
// blink LED
static uint8_t led_state = 0;
static uint8_t led_count = 0;
led_count++;
if ((led_count & 0x07) == 0) {
led_set((led_state ^= (1<<USB_LED_CAPS_LOCK)));
}
*/
}
#endif