Merge remote-tracking branch 'upstream/master'

* upstream/master: (1239 commits)
  Update ez.c
  removes planck/rev3 temporarily
  Move hand_swap_config to ez.c, removes error for infinity
  Update Makefile
  ergodox: Update algernon's keymap to v1.9
  Added VS Code dir to .gitignore
  Support the Pegasus Hoof controller.
  [Jack & Erez] Simplifies and documents TO
  add readme
  use wait_ms instead of _delay_ms
  add messenger
  init keymap
  Add example keymap
  Adding whiskey_tango_foxtrot_capslock ergodox keymap
  Unicode map framework. Allow unicode up to 0xFFFFF using separate mapping table
  CIE 1931 dim curve
  Apply the dim curve to the RGB output
  Update the Cluecard readme files
  Tune snake and knight intervals for Cluecard
  Tunable RGB light intervals
  ...

1 files changed, 62 insertions, 0 deletions

diff --git a/doc/POWER.txt b/doc/POWER.txt
new file mode 100644
index 0000000000..0abbbe48e8
--- /dev/null
+++ b/doc/POWER.txt
@@ -0,0 +1,62 @@
+Time to Sleep
+=============
+USB suspend     no activity on USB line for  3ms
+No Interaction  no user interaction
+    matrix has no change
+    matrix has no switch on
+
+
+AVR Power Management
+====================
+
+V-USB suspend
+    USB suspend
+    http://vusb.wikidot.com/examples
+
+MCUSR   MCU Status Register
+    WDRF    Watchdog Reset Flag
+    BORF
+    EXTRF
+    PORF    Power-on Reset Flag
+
+SMCR    Sleep Mode Control Register
+    SE      Sleep Enable
+    SM2:0   
+        #define set_sleep_mode(mode) \
+        #define SLEEP_MODE_IDLE         (0)
+        #define SLEEP_MODE_ADC          _BV(SM0)
+        #define SLEEP_MODE_PWR_DOWN     _BV(SM1)
+        #define SLEEP_MODE_PWR_SAVE     (_BV(SM0) | _BV(SM1))
+        #define SLEEP_MODE_STANDBY      (_BV(SM1) | _BV(SM2))
+        #define SLEEP_MODE_EXT_STANDBY  (_BV(SM0) | _BV(SM1) | _BV(SM2))
+
+
+ACSR    Analog Comparator Control and Status Register
+    To disable Analog Comparator
+    ACSR = 0x80;
+    or
+    ACSR &= ~_BV(ACIE);
+    ACSR |= _BV(ACD);
+
+    ACD: Analog Comparator Disable
+        When this bit is written logic one, the power to the Analog Comparator is
+        switched off. This bit can be set at any time to turn off the Analog
+        Comparator. This will reduce power consumption in Active and Idle mode.
+        When changing the ACD bit, the Analog Comparator Interrupt must be disabled
+        by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when
+        the bit is changed.
+
+DIDR1   Digital Input Disable Register 1
+    AIN1D
+    AIN0D
+        When this bit is written logic one, the digital input buffer on the AIN1/0 pin is disabled. The corresponding PIN Register bit will always read as zero when this bit is set. When an analog signal is applied to the AIN1/0 pin and the digital input from this pin is not needed, this bit should be written logic one to reduce power consumption in the digital input buffer.
+
+
+PRR     Power Reduction Register
+    PRTWI
+    PRTIM2
+    PRTIM0
+    PRTIM1
+    PRSPI
+    PRUSART0
+    PRADC