common/suspend.c

   1 #include "suspend.h"
   2 #include "matrix.h"
   3 #include "action.h"
   4 #include "backlight.h"
   5
   6
   7 void suspend_power_down(void)
   8 {
   9 #ifdef BACKLIGHT_ENABLE
  10     backlight_set(0);
  11 #endif
  12 #ifndef NO_SUSPEND_POWER_DOWN
  13     // Enable watchdog to wake from MCU sleep
  14     cli();
  15     wdt_reset();
  16
  17     // Watchdog Interrupt and System Reset Mode
  18     //wdt_enable(WDTO_1S);
  19     //WDTCSR |= _BV(WDIE);
  20
  21     // Watchdog Interrupt Mode
  22     wdt_intr_enable(WDTO_120MS);
  23
  24     // TODO: more power saving
  25     // See PicoPower application note
  26     // - I/O port input with pullup
  27     // - prescale clock
  28     // - BOD disable
  29     // - Power Reduction Register PRR
  30     // sleep in power down mode
  31     set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  32     sleep_enable();
  33     sei();
  34     sleep_cpu();
  35     sleep_disable();
  36
  37     // Disable watchdog after sleep
  38     wdt_disable();
  39 #endif
  40 }
  41
  42 bool suspend_wakeup_condition(void)
  43 {
  44     matrix_scan();
  45     for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
  46         if (matrix_get_row(r)) return true;
  47     }
  48     return false;
  49 }
  50
  51 // run immediately after wakeup
  52 void suspend_wakeup_init(void)
  53 {
  54     // clear keyboard state
  55     clear_keyboard();
  56 #ifdef BACKLIGHT_ENABLE
  57     backlight_init();
  58 #endif
  59 }
  60
  61 #ifndef NO_SUSPEND_POWER_DOWN
  62 /* watchdog timeout */
  63 ISR(WDT_vect)
  64 {
  65     /* wakeup from MCU sleep mode */
  66 /*
  67     // blink LED
  68     static uint8_t led_state = 0;
  69     static uint8_t led_count = 0;
  70     led_count++;
  71     if ((led_count & 0x07) == 0) {
  72         led_set((led_state ^= (1<<USB_LED_CAPS_LOCK)));
  73     }
  74 */
  75 }
  76 #endif