common/avr/suspend.c

   1 #include <stdbool.h>
   2 #include <avr/sleep.h>
   3 #include <avr/wdt.h>
   4 #include <avr/interrupt.h>
   5 #include "matrix.h"
   6 #include "action.h"
   7 #include "backlight.h"
   8 #include "suspend_avr.h"
   9 #include "suspend.h"
  10 #include "timer.h"
  11 #ifdef PROTOCOL_LUFA
  12 #include "lufa.h"
  13 #endif
  14
  15
  16 #define wdt_intr_enable(value)   \
  17 __asm__ __volatile__ (  \
  18     "in __tmp_reg__,__SREG__" "\n\t"    \
  19     "cli" "\n\t"    \
  20     "wdr" "\n\t"    \
  21     "sts %0,%1" "\n\t"  \
  22     "out __SREG__,__tmp_reg__" "\n\t"   \
  23     "sts %0,%2" "\n\t" \
  24     : /* no outputs */  \
  25     : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
  26     "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
  27     "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
  28         _BV(WDIE) | (value & 0x07)) ) \
  29     : "r0"  \
  30 )
  31
  32
  33 void suspend_idle(uint8_t time)
  34 {
  35     cli();
  36     set_sleep_mode(SLEEP_MODE_IDLE);
  37     sleep_enable();
  38     sei();
  39     sleep_cpu();
  40     sleep_disable();
  41 }
  42
  43 /* Power down MCU with watchdog timer
  44  * wdto: watchdog timer timeout defined in <avr/wdt.h>
  45  *          WDTO_15MS
  46  *          WDTO_30MS
  47  *          WDTO_60MS
  48  *          WDTO_120MS
  49  *          WDTO_250MS
  50  *          WDTO_500MS
  51  *          WDTO_1S
  52  *          WDTO_2S
  53  *          WDTO_4S
  54  *          WDTO_8S
  55  */
  56 static uint8_t wdt_timeout = 0;
  57 static void power_down(uint8_t wdto)
  58 {
  59 #ifdef PROTOCOL_LUFA
  60     if (USB_DeviceState == DEVICE_STATE_Configured) return;
  61 #endif
  62     wdt_timeout = wdto;
  63
  64     // Watchdog Interrupt Mode
  65     wdt_intr_enable(wdto);
  66
  67     // TODO: more power saving
  68     // See PicoPower application note
  69     // - I/O port input with pullup
  70     // - prescale clock
  71     // - BOD disable
  72     // - Power Reduction Register PRR
  73     set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  74     sleep_enable();
  75     sei();
  76     sleep_cpu();
  77     sleep_disable();
  78
  79     // Disable watchdog after sleep
  80     wdt_disable();
  81 }
  82
  83 void suspend_power_down(void)
  84 {
  85     power_down(WDTO_15MS);
  86 }
  87
  88 bool suspend_wakeup_condition(void)
  89 {
  90     matrix_power_up();
  91     matrix_scan();
  92     matrix_power_down();
  93     for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
  94         if (matrix_get_row(r)) return true;
  95     }
  96     return false;
  97 }
  98
  99 // run immediately after wakeup
 100 void suspend_wakeup_init(void)
 101 {
 102     // clear keyboard state
 103     clear_keyboard();
 104 #ifdef BACKLIGHT_ENABLE
 105     backlight_init();
 106 #endif
 107 }
 108
 109 #ifndef NO_SUSPEND_POWER_DOWN
 110 /* watchdog timeout */
 111 ISR(WDT_vect)
 112 {
 113     // compensate timer for sleep
 114     switch (wdt_timeout) {
 115         case WDTO_15MS:
 116             timer_count += 15 + 2;  // WDTO_15MS + 2(from observation)
 117             break;
 118         default:
 119             ;
 120     }
 121 }
 122 #endif