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 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 __attribute__ ((weak)) void matrix_power_up(void) {}
  89 __attribute__ ((weak)) void matrix_power_down(void) {}
  90 bool suspend_wakeup_condition(void)
  91 {
  92     matrix_power_up();
  93     matrix_scan();
  94     matrix_power_down();
  95     for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
  96         if (matrix_get_row(r)) return true;
  97     }
  98     return false;
  99 }
 100
 101 // run immediately after wakeup
 102 void suspend_wakeup_init(void)
 103 {
 104     // clear keyboard state
 105     matrix_init();
 106     clear_keyboard();
 107 #ifdef BACKLIGHT_ENABLE
 108     backlight_init();
 109 #endif
 110 }
 111
 112 #ifndef NO_SUSPEND_POWER_DOWN
 113 /* watchdog timeout */
 114 ISR(WDT_vect)
 115 {
 116     // compensate timer for sleep
 117     switch (wdt_timeout) {
 118         case WDTO_15MS:
 119             timer_count += 15 + 2;  // WDTO_15MS + 2(from observation)
 120             break;
 121         default:
 122             ;
 123     }
 124 }
 125 #endif