common/suspend.c

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