summaryrefslogtreecommitdiffstats
path: root/tmk_core/common/avr/suspend.c
blob: c07c2801d5ef75e277ab1b460f0fcac826b13568 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
#include <stdbool.h>
#include <avr/sleep.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include "matrix.h"
#include "action.h"
#include "backlight.h"
#include "suspend_avr.h"
#include "suspend.h"
#include "timer.h"
#include "led.h"
#ifdef PROTOCOL_LUFA
#include "lufa.h"
#endif


#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"  \
)


void suspend_idle(uint8_t time)
{
    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
 */
static uint8_t wdt_timeout = 0;
static void power_down(uint8_t wdto)
{
#ifdef PROTOCOL_LUFA
    if (USB_DeviceState == DEVICE_STATE_Configured) return;
#endif
    wdt_timeout = wdto;

    // Watchdog Interrupt Mode
    wdt_intr_enable(wdto);

#ifdef BACKLIGHT_ENABLE
	backlight_set(0);
#endif

	// Turn off LED indicators
	led_set(0);

    // 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();
}

void suspend_power_down(void)
{
    power_down(WDTO_15MS);
}

__attribute__ ((weak)) void matrix_power_up(void) {}
__attribute__ ((weak)) void matrix_power_down(void) {}
bool suspend_wakeup_condition(void)
{
#ifdef BACKLIGHT_ENABLE
    backlight_set(0);
#endif
    matrix_power_up();
    matrix_scan();
    matrix_power_down();
    for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
        if (matrix_get_row(r)) return true;
    }
    return false;
}

// run immediately after wakeup
void suspend_wakeup_init(void)
{
    // clear keyboard state
    clear_keyboard();
#ifdef BACKLIGHT_ENABLE
    backlight_set(0);
    backlight_init();
#endif
led_set(host_keyboard_leds());
}

#ifndef NO_SUSPEND_POWER_DOWN
/* 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