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
  11
  12 #define wdt_intr_enable(value)   \
  13 __asm__ __volatile__ (  \
  14     "in __tmp_reg__,__SREG__" "\n\t"    \
  15     "cli" "\n\t"    \
  16     "wdr" "\n\t"    \
  17     "sts %0,%1" "\n\t"  \
  18     "out __SREG__,__tmp_reg__" "\n\t"   \
  19     "sts %0,%2" "\n\t" \
  20     : /* no outputs */  \
  21     : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
  22     "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
  23     "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
  24         _BV(WDIE) | (value & 0x07)) ) \
  25     : "r0"  \
  26 )
  27
  28
  29 void suspend_power_down(void)
  30 {
  31 #ifdef BACKLIGHT_ENABLE
  32     backlight_set(0);
  33 #endif
  34 #ifndef NO_SUSPEND_POWER_DOWN
  35     // Enable watchdog to wake from MCU sleep
  36     cli();
  37     wdt_reset();
  38
  39     // Watchdog Interrupt and System Reset Mode
  40     //wdt_enable(WDTO_1S);
  41     //WDTCSR |= _BV(WDIE);
  42
  43     // Watchdog Interrupt Mode
  44     wdt_intr_enable(WDTO_120MS);
  45
  46     // TODO: more power saving
  47     // See PicoPower application note
  48     // - I/O port input with pullup
  49     // - prescale clock
  50     // - BOD disable
  51     // - Power Reduction Register PRR
  52     // sleep in power down mode
  53     set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  54     sleep_enable();
  55     sei();
  56     sleep_cpu();
  57     sleep_disable();
  58
  59     // Disable watchdog after sleep
  60     wdt_disable();
  61 #endif
  62 }
  63
  64 bool suspend_wakeup_condition(void)
  65 {
  66     matrix_scan();
  67     for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
  68         if (matrix_get_row(r)) return true;
  69     }
  70     return false;
  71 }
  72
  73 // run immediately after wakeup
  74 void suspend_wakeup_init(void)
  75 {
  76     // clear keyboard state
  77     clear_keyboard();
  78 #ifdef BACKLIGHT_ENABLE
  79     backlight_init();
  80 #endif
  81 }
  82
  83 #ifndef NO_SUSPEND_POWER_DOWN
  84 /* watchdog timeout */
  85 ISR(WDT_vect)
  86 {
  87     /* wakeup from MCU sleep mode */
  88 /*
  89     // blink LED
  90     static uint8_t led_state = 0;
  91     static uint8_t led_count = 0;
  92     led_count++;
  93     if ((led_count & 0x07) == 0) {
  94         led_set((led_state ^= (1<<USB_LED_CAPS_LOCK)));
  95     }
  96 */
  97 }
  98 #endif