124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
#include <stdbool.h>
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#include <avr/sleep.h>
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#include <avr/wdt.h>
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#include <avr/interrupt.h>
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#include "suspend.h"
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#include "action.h"
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#include "timer.h"
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#ifdef PROTOCOL_LUFA
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# include "lufa.h"
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#endif
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#ifdef PROTOCOL_VUSB
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# include "vusb.h"
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#endif
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// TODO: This needs some cleanup
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#if !defined(NO_SUSPEND_POWER_DOWN) && defined(WDT_vect)
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// clang-format off
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#define wdt_intr_enable(value) \
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__asm__ __volatile__ ( \
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"in __tmp_reg__,__SREG__" "\n\t" \
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"cli" "\n\t" \
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"wdr" "\n\t" \
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"sts %0,%1" "\n\t" \
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"out __SREG__,__tmp_reg__" "\n\t" \
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"sts %0,%2" "\n\t" \
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: /* no outputs */ \
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: "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
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"r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
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"r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | _BV(WDIE) | (value & 0x07))) \
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: "r0" \
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)
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// clang-format on
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/** \brief Power down MCU with watchdog timer
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*
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* wdto: watchdog timer timeout defined in <avr/wdt.h>
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* WDTO_15MS
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* WDTO_30MS
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* WDTO_60MS
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* WDTO_120MS
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* WDTO_250MS
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* WDTO_500MS
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* WDTO_1S
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* WDTO_2S
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* WDTO_4S
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* WDTO_8S
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*/
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static uint8_t wdt_timeout = 0;
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/** \brief Power down
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*
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* FIXME: needs doc
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*/
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static void power_down(uint8_t wdto) {
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wdt_timeout = wdto;
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// Watchdog Interrupt Mode
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wdt_intr_enable(wdto);
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// TODO: more power saving
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// See PicoPower application note
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// - I/O port input with pullup
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// - prescale clock
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// - BOD disable
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// - Power Reduction Register PRR
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set_sleep_mode(SLEEP_MODE_PWR_DOWN);
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sleep_enable();
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sei();
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sleep_cpu();
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sleep_disable();
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// Disable watchdog after sleep
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wdt_disable();
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}
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/* watchdog timeout */
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ISR(WDT_vect) {
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// compensate timer for sleep
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switch (wdt_timeout) {
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case WDTO_15MS:
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timer_count += 15 + 2; // WDTO_15MS + 2(from observation)
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break;
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default:;
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}
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}
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#endif
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/** \brief Suspend power down
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*
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* FIXME: needs doc
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*/
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void suspend_power_down(void) {
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#ifdef PROTOCOL_LUFA
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if (USB_DeviceState == DEVICE_STATE_Configured) return;
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#endif
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#ifdef PROTOCOL_VUSB
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if (!vusb_suspended) return;
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#endif
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suspend_power_down_quantum();
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#ifndef NO_SUSPEND_POWER_DOWN
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// Enter sleep state if possible (ie, the MCU has a watchdog timeout interrupt)
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# if defined(WDT_vect)
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power_down(WDTO_15MS);
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# endif
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#endif
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}
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/** \brief run immediately after wakeup
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*
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* FIXME: needs doc
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*/
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void suspend_wakeup_init(void) {
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// clear keyboard state
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clear_keyboard();
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suspend_wakeup_init_quantum();
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}
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