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 #include "led.h"
  12 #ifdef PROTOCOL_LUFA
  13 #include "lufa.h"
  14 #endif
  15
  16
  17 #define wdt_intr_enable(value)   \
  18 __asm__ __volatile__ (  \
  19     "in __tmp_reg__,__SREG__" "\n\t"    \
  20     "cli" "\n\t"    \
  21     "wdr" "\n\t"    \
  22     "sts %0,%1" "\n\t"  \
  23     "out __SREG__,__tmp_reg__" "\n\t"   \
  24     "sts %0,%2" "\n\t" \
  25     : /* no outputs */  \
  26     : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
  27     "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
  28     "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
  29         _BV(WDIE) | (value & 0x07)) ) \
  30     : "r0"  \
  31 )
  32
  33
  34 void suspend_idle(uint8_t time)
  35 {
  36     cli();
  37     set_sleep_mode(SLEEP_MODE_IDLE);
  38     sleep_enable();
  39     sei();
  40     sleep_cpu();
  41     sleep_disable();
  42 }
  43
  44 /* Power down MCU with watchdog timer
  45  * wdto: watchdog timer timeout defined in <avr/wdt.h>
  46  *          WDTO_15MS
  47  *          WDTO_30MS
  48  *          WDTO_60MS
  49  *          WDTO_120MS
  50  *          WDTO_250MS
  51  *          WDTO_500MS
  52  *          WDTO_1S
  53  *          WDTO_2S
  54  *          WDTO_4S
  55  *          WDTO_8S
  56  */
  57 static uint8_t wdt_timeout = 0;
  58 static void power_down(uint8_t wdto)
  59 {
  60 #ifdef PROTOCOL_LUFA
  61     if (USB_DeviceState == DEVICE_STATE_Configured) return;
  62 #endif
  63     wdt_timeout = wdto;
  64
  65     // Watchdog Interrupt Mode
  66     wdt_intr_enable(wdto);
  67
  68 #ifdef BACKLIGHT_ENABLE
  69 backlight_set(0);
  70 #endif
  71
  72     led_off();
  73
  74     // TODO: more power saving
  75     // See PicoPower application note
  76     // - I/O port input with pullup
  77     // - prescale clock
  78     // - BOD disable
  79     // - Power Reduction Register PRR
  80     set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  81     sleep_enable();
  82     sei();
  83     sleep_cpu();
  84     sleep_disable();
  85
  86     // Disable watchdog after sleep
  87     wdt_disable();
  88 }
  89
  90 void suspend_power_down(void)
  91 {
  92     power_down(WDTO_15MS);
  93 }
  94
  95 __attribute__ ((weak)) void matrix_power_up(void) {}
  96 __attribute__ ((weak)) void matrix_power_down(void) {}
  97 bool suspend_wakeup_condition(void)
  98 {
  99 #ifdef BACKLIGHT_ENABLE
 100     backlight_set(0);
 101 #endif
 102     matrix_power_up();
 103     matrix_scan();
 104     matrix_power_down();
 105     for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
 106         if (matrix_get_row(r)) return true;
 107     }
 108     return false;
 109 }
 110
 111 // run immediately after wakeup
 112 void suspend_wakeup_init(void)
 113 {
 114     // clear keyboard state
 115     clear_keyboard();
 116 #ifdef BACKLIGHT_ENABLE
 117     backlight_set(0);
 118     backlight_init();
 119 #endif
 120 led_set(host_keyboard_leds());
 121 }
 122
 123 #ifndef NO_SUSPEND_POWER_DOWN
 124 /* watchdog timeout */
 125 ISR(WDT_vect)
 126 {
 127     // compensate timer for sleep
 128     switch (wdt_timeout) {
 129         case WDTO_15MS:
 130             timer_count += 15 + 2;  // WDTO_15MS + 2(from observation)
 131             break;
 132         default:
 133             ;
 134     }
 135 }
 136 #endif
 137