tmk_core/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 /* Power down MCU with watchdog timer
  34  * wdto: watchdog timer timeout defined in <avr/wdt.h>
  35  *          WDTO_15MS
  36  *          WDTO_30MS
  37  *          WDTO_60MS
  38  *          WDTO_120MS
  39  *          WDTO_250MS
  40  *          WDTO_500MS
  41  *          WDTO_1S
  42  *          WDTO_2S
  43  *          WDTO_4S
  44  *          WDTO_8S
  45  */
  46 static uint8_t wdt_timeout = 0;
  47 static void power_down(uint8_t wdto)
  48 {
  49 #ifdef PROTOCOL_LUFA
  50     if (USB_DeviceState == DEVICE_STATE_Configured) return;
  51 #endif
  52     wdt_timeout = wdto;
  53
  54     // Watchdog Interrupt Mode
  55     wdt_intr_enable(wdto);
  56
  57     // TODO: more power saving
  58     // See PicoPower application note
  59     // - I/O port input with pullup
  60     // - prescale clock
  61     // - BOD disable
  62     // - Power Reduction Register PRR
  63     set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  64     sleep_enable();
  65     sei();
  66     sleep_cpu();
  67     sleep_disable();
  68
  69     // Disable watchdog after sleep
  70     wdt_disable();
  71 }
  72
  73 static void standby(void)
  74 {
  75     set_sleep_mode(SLEEP_MODE_STANDBY);
  76     sleep_enable();
  77     sei();
  78     sleep_cpu();
  79     sleep_disable();
  80 }
  81
  82 static void idle(void)
  83 {
  84     set_sleep_mode(SLEEP_MODE_IDLE);
  85     sleep_enable();
  86     sei();
  87     sleep_cpu();
  88     sleep_disable();
  89 }
  90
  91
  92 void suspend_idle(uint8_t time)
  93 {
  94     idle();
  95 }
  96
  97 void suspend_power_down(void)
  98 {
  99 #ifdef NO_SUSPEND_POWER_DOWN
 100     ;
 101 #elif defined(SUSPEND_MODE_NOPOWERSAVE)
 102     ;
 103 #elif defined(SUSPEND_MODE_STANDBY)
 104     standby();
 105 #elif defined(SUSPEND_MODE_IDLE)
 106     idle();
 107 #else
 108     power_down(WDTO_15MS);
 109 #endif
 110 }
 111
 112 bool suspend_wakeup_condition(void)
 113 {
 114     matrix_power_up();
 115     matrix_scan();
 116     matrix_power_down();
 117     for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
 118         if (matrix_get_row(r)) return true;
 119     }
 120     return false;
 121 }
 122
 123 // run immediately after wakeup
 124 void suspend_wakeup_init(void)
 125 {
 126     // clear keyboard state
 127     matrix_clear();
 128     clear_keyboard();
 129 #ifdef BACKLIGHT_ENABLE
 130     backlight_init();
 131 #endif
 132 }
 133
 134 #ifndef NO_SUSPEND_POWER_DOWN
 135 /* watchdog timeout */
 136 ISR(WDT_vect)
 137 {
 138     // compensate timer for sleep
 139     switch (wdt_timeout) {
 140         case WDTO_15MS:
 141             timer_count += 15 + 2;  // WDTO_15MS + 2(from observation)
 142             break;
 143         default:
 144             ;
 145     }
 146 }
 147 #endif