From 2c0bb5e7e620b0472f110d2cbc5768bb6d97eec5 Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Mon, 25 Mar 2013 01:46:32 +0900
Subject: Add common/suspend.c

---
 common/suspend.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 common/suspend.c

(limited to 'common/suspend.c')

diff --git a/common/suspend.c b/common/suspend.c
new file mode 100644
index 0000000000..397e0729a6
--- /dev/null
+++ b/common/suspend.c
@@ -0,0 +1,51 @@
+#include "suspend.h"
+#include "matrix.h"
+#include "action.h"
+
+
+void suspend_power_down(void)
+{
+#ifndef NO_SUSPEND_POWER_DOWN
+    // Enable watchdog to wake from MCU sleep
+    cli();
+    wdt_reset();
+
+    // Watchdog Interrupt and System Reset Mode
+    //wdt_enable(WDTO_1S);
+    //WDTCSR |= _BV(WDIE);
+    
+    // Watchdog Interrupt Mode
+    wdt_intr_enable(WDTO_120MS);
+    
+    // TODO: more power saving
+    // See PicoPower application note
+    // - I/O port input with pullup
+    // - prescale clock
+    // - BOD disable
+    // - Power Reduction Register PRR
+    // sleep in power down mode
+    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+    sleep_enable();
+    sei();
+    sleep_cpu();
+    sleep_disable();
+
+    // Disable watchdog after sleep
+    wdt_disable();
+#endif
+}
+
+bool suspend_wakeup_condition(void)
+{
+    matrix_scan();
+    for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
+        if (matrix_get_row(r)) return true;
+    }
+    return false;
+}
+
+void suspend_wakeup_init(void)
+{
+    matrix_init();
+    clear_keyboard();
+}
-- 
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