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authortmk <nobody@nowhere>2013-03-14 22:45:02 +0900
committertmk <nobody@nowhere>2013-03-14 22:45:02 +0900
commit42f6ff088652827a82474c3a07f4c2c9497bacd9 (patch)
tree26b05160550eea9e969a0249ce946ec4bf065255
parentc8cfde01389a7f945e237b8571c1d4202e0d60d0 (diff)
Add power down mode sleep and watchdog interrupt
-rw-r--r--protocol/lufa/lufa.c76
1 files changed, 73 insertions, 3 deletions
diff --git a/protocol/lufa/lufa.c b/protocol/lufa/lufa.c
index fc3798cdf9..556d0aeecc 100644
--- a/protocol/lufa/lufa.c
+++ b/protocol/lufa/lufa.c
@@ -133,7 +133,15 @@ static void Console_Task(void)
/*******************************************************************************
* USB Events
******************************************************************************/
+/*
+ * Event Order of Plug in:
+ * 0) EVENT_USB_Device_Connect
+ * 1) EVENT_USB_Device_Suspend
+ * 2) EVENT_USB_Device_Reset
+ * 3) EVENT_USB_Device_Wake
+*/
#include "led.h"
+#include "matrix.h"
void EVENT_USB_Device_Connect(void)
{
}
@@ -148,11 +156,16 @@ void EVENT_USB_Device_Reset(void)
void EVENT_USB_Device_Suspend()
{
- led_set(1<<USB_LED_CAPS_LOCK);
}
+#include "action.h"
void EVENT_USB_Device_WakeUp()
{
+ // initialize
+ matrix_init();
+ clear_keyboard();
+
+ // turn off LED
led_set(0);
}
@@ -490,6 +503,24 @@ static bool wakeup_condition(void)
return false;
}
+#include <avr/sleep.h>
+#include <avr/wdt.h>
+#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" \
+)
+
int main(void) __attribute__ ((weak));
int main(void)
{
@@ -499,9 +530,36 @@ int main(void)
sei();
while (1) {
+ // while suspend
while (USB_DeviceState == DEVICE_STATE_Suspended) {
- // TODO: power saving
-
+ // 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();
+
+ // Send request of USB Wakeup from Suspend to host
if (USB_Device_RemoteWakeupEnabled) {
if (wakeup_condition()) {
USB_Device_SendRemoteWakeup();
@@ -516,3 +574,15 @@ int main(void)
#endif
}
}
+
+/* watchdog timeout during sleep */
+ISR(WDT_vect)
+{
+ // blink LED
+ static uint8_t led_state = 0;
+ static uint8_t led_count = 0;
+ led_count++;
+ if ((led_count & 0x07) == 0) {
+ led_set((led_state ^= (1<<USB_LED_CAPS_LOCK)));
+ }
+}