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-rw-r--r--common/avr/suspend.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/common/avr/suspend.c b/common/avr/suspend.c
new file mode 100644
index 000000000..80243f02b
--- /dev/null
+++ b/common/avr/suspend.c
@@ -0,0 +1,122 @@
+#include <stdbool.h>
+#include <avr/sleep.h>
+#include <avr/wdt.h>
+#include <avr/interrupt.h>
+#include "matrix.h"
+#include "action.h"
+#include "backlight.h"
+#include "suspend_avr.h"
+#include "suspend.h"
+#include "timer.h"
+#ifdef PROTOCOL_LUFA
+#include "lufa.h"
+#endif
+
+
+#define wdt_intr_enable(value) \
+__asm__ __volatile__ ( \
+ "in __tmp_reg__,__SREG__" "\n\t" \
+ "cli" "\n\t" \
+ "wdr" "\n\t" \
+ "sts %0,%1" "\n\t" \
+ "out __SREG__,__tmp_reg__" "\n\t" \
+ "sts %0,%2" "\n\t" \
+ : /* no outputs */ \
+ : "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
+ "r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
+ "r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
+ _BV(WDIE) | (value & 0x07)) ) \
+ : "r0" \
+)
+
+
+void suspend_idle(uint8_t time)
+{
+ cli();
+ set_sleep_mode(SLEEP_MODE_IDLE);
+ sleep_enable();
+ sei();
+ sleep_cpu();
+ sleep_disable();
+}
+
+/* Power down MCU with watchdog timer
+ * wdto: watchdog timer timeout defined in <avr/wdt.h>
+ * WDTO_15MS
+ * WDTO_30MS
+ * WDTO_60MS
+ * WDTO_120MS
+ * WDTO_250MS
+ * WDTO_500MS
+ * WDTO_1S
+ * WDTO_2S
+ * WDTO_4S
+ * WDTO_8S
+ */
+static uint8_t wdt_timeout = 0;
+static void power_down(uint8_t wdto)
+{
+#ifdef PROTOCOL_LUFA
+ if (USB_DeviceState == DEVICE_STATE_Configured) return;
+#endif
+ wdt_timeout = wdto;
+
+ // Watchdog Interrupt Mode
+ wdt_intr_enable(wdto);
+
+ // TODO: more power saving
+ // See PicoPower application note
+ // - I/O port input with pullup
+ // - prescale clock
+ // - BOD disable
+ // - Power Reduction Register PRR
+ set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+ sleep_enable();
+ sei();
+ sleep_cpu();
+ sleep_disable();
+
+ // Disable watchdog after sleep
+ wdt_disable();
+}
+
+void suspend_power_down(void)
+{
+ power_down(WDTO_15MS);
+}
+
+bool suspend_wakeup_condition(void)
+{
+ matrix_power_up();
+ matrix_scan();
+ matrix_power_down();
+ for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
+ if (matrix_get_row(r)) return true;
+ }
+ return false;
+}
+
+// run immediately after wakeup
+void suspend_wakeup_init(void)
+{
+ // clear keyboard state
+ clear_keyboard();
+#ifdef BACKLIGHT_ENABLE
+ backlight_init();
+#endif
+}
+
+#ifndef NO_SUSPEND_POWER_DOWN
+/* watchdog timeout */
+ISR(WDT_vect)
+{
+ // compensate timer for sleep
+ switch (wdt_timeout) {
+ case WDTO_15MS:
+ timer_count += 15 + 2; // WDTO_15MS + 2(from observation)
+ break;
+ default:
+ ;
+ }
+}
+#endif