rn42: Update doc

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diff --git a/keyboard/hhkb_rn42/MEMO.txt b/keyboard/hhkb_rn42/MEMO.txt
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-Roving RN-42
-============
-
-Bug:
-- with Nexus5 keyboard and mouse are very laggy.
-
-- lose USB connection during power-down mode - DONE
-    - USB initialize code in main() causes this - WRONG
-    - Do not power-down during USB connection is active - DONE 11/11
-        (USB_DeviceState == USB_DEVICE_Configured) is used to check USB connection
-        matrix_power_down() matrix.c - 11/23
-
-- When given power only from wall wart adapter
-    - it sleeps. it should not sleep
-    - Configured state without USB connection?
-
-- timer is slow while power down - DONE 11/26
-    - time out interrupt is lost while power down?
-    - interrupt of watchdog timer compensates timer counter(avr/suspend.c)
-
-- USB plug-in fails while BT
-    - it ends in suspend state
-    - maybe, not responsive to host enumeration process due to power-down.
-    - matrix_power_down() only when state is unattached - 11/26
-        - need to observe a while
-- repeated CHARGING/FULL_CHARGED
-    - In LTC sharp pulses are observed.
-    - MCP has no pulse but still has a problem.
-    - needs more wait before read pin state? - NO
-- wrongly suspended when powered from adapter without USB connection - DONE
-    - suspend event may occur when plug into adapter
-    - and never wake until conected to real USB line
-    - without debug print via USB no problem; CSW(wake just after suspend as real USB line)
-    - seems like USB print causes this problem after suspended
-
-- Factory Reset PIO4 doesn't work
-    - the reason is unclear - 12/08 NOT LOOK INTO ANY MORE
-    - WORKAROUND: use serial pins(3.3V, GND, RX and TX)
-        - SF,1 and R,1 to set factory defalult
-    
-
-Todo:
-- LED cover and switch knob and new Slide Switch
-- RN42 auto configuration
-    - configure the module as HID device every time powering up
-    - this'll reduce work load of assembly
-
-- move rn42 to protocol directory when it becomes reusable stack
-
-- sendchar() in lufa.c no buffer
-    - no buffering. character lost can be caused.
-- LUFA sendchar should be buffered and serial_uart.c buffur size is too large(256).
-
-- switch BT host connections
-- BT operations
-    - disconnect
-    - new connection
-    - switch next connection
-    - remove connection
-
-- sendchar() in lufa.c block loop   - DONE 11/29
-    - block loop when powered with AC adapter
-    - FrameNumber is not updated when adapter powered
-
-Improving:
-- ADC resolution
-    AVR120
-    AVR32138
-    - Enhancing ADC resolution by oversampling
-        AVR121  http://www.atmel.com/images/doc8003.pdf
-    - disable digital input buffer DIDR(7.8.6)
-
-Design:
-- suspend.h - DONE 11/26
-    - remove argument from suspend_power_down() for backward compatitibility
-- remove MCU dependent power saving code from core/keyboard - DONE 11/23
-    - it should be located in project matrix.c
-- HHKB matrix.c needs matrix_prev?
-    - is_modified() is obsolete now. really needs?
-- ADC: removing AREF capacitor C10
-    - seems to be better while usb powered
-    - still bad while battery powered
-    http://electronics.stackexchange.com/questions/105849/avcc-and-capacitor-using-adc
-- ADC: smaller resistors for voltage dividor
-    - 1K + 1K: not improved. - 11/27
-
-
-LUFA:
-USB connection check: state of USB deivce
-- USB_DeviceState:
-    USB_Deivce_State_t { Unattached, Powered, Default, Addressed, Configured*, Suspended* }
-    Unattached: unpluged
-    Powered:    pluged with power adapter
-    Default:    enumerate process bigin
-    Addressed:  addressed
-    Configured: enumerated
-    Suspended:  suspended
-
-- USB_IsInitialized: state of LUFA core setup
-    becomes true in USB_Init()  USBController_AVR8.c
-    becomes false in USB_Disable()  USBController_AVR8.c
-- USB_VBUS_GetStatus(): state of VBUS(power/connection)
-- USB_Disable() detaches, disables all interrupts, controller, PLL, regulater.
-
-- When connect to power adapter
-    - event happened: CW or CSW or C or DDC
-    - USB state: not configured
-
-- USB evnets
-    - USB connect: CSWRWRW
-    - USB connect but fail to enumeration: CWRWRWRWS
-    - USB disconnect: D
-    - Power adapter connect: CW, CSW, C
-    - Power adapter disconnect: D
-
-
-Power saving:
-- Pro2 current consumption
-    - active: 138.2mA(no device on Hub)
-    - suspended: 30.9mA(WakeUp enabled DIPSW6)
-    - suspended: 0mA->46.0mA(WakeUp disabled DIPSW6)
-- Pro current consumption
-    - active: 54.0mA
-    - suspended: 40.5mA(WakeUp enabled DIPSW6)
-    - suspended: 0.3mA(WakeUp disabled DIPSW6)
-
-- RN42 3.3V
-    - disconnected(Idle): 5mA (config mode)
-    - connected(Active):
-        SW,0000:  23-26mA
-        SW,0010:  27-29mA worse than 0000 for unknown reason
-        SW,0020:  17-19mA mouse NG
-        SW,0030:  13-16mA laggy mouse NG
-        SW,0050:  10-13mA laggy mouse NG
-
-- matrix power saving
-    - power saving while externally powered and not while unpluged
-- confirm suspend mode lufa.c: matrix_power_*, suspend_wakeup_condition
-- 8MHz clock
-- When not connected in a few minutes get into deep sleep to save battery life
-- CTS is needed for waking up from deep sleep? How deep sleep is activated?
-- firmware controlled 3.3V DC converter to switch on/off BT module
-- sleep MCU and BT module(keyboard is not used)
-- deep sleep MCU and BT module(keyboard is not used for long time)
-- deep sleep MCU and turn off BT module(keyboard is not used and not connected)
-- Battery ADC; switching, high resistance
-    - switching gnd end of divider with PF4
-    - high resistor 100K/1M?
-        capacitor   10nF
-        http://www.eevblog.com/forum/beginners/measuring-battery-voltage-without-consuming-current/
-- During USB suspend change clock source to internal RC from external Xtal(6.8)
-- FRZCLK: you can freeze clock for power saving. still WAKEUPI and VBUSTI interrupts are available while freezing.(21.7.3)
-- Suspend: Clear Suspend Bit, Freeze clock, disable PLL, MCU sleep(21.13)
-- Voltage reference(8.1.1)
-    - to reduce power consumption while power down mode
-- unset ADEN before sleep(24.7)
-
-
-
-
-
-
-
-Lipo
-----
-850mA lasts around 9 hours(07/28)
-
-Sparkfun Polymer Lithium Ion Battery 850mAh:
-https://www.sparkfun.com/products/341
-Lipo Cell spec:
-https://www.sparkfun.com/datasheets/Batteries/063048%20Li-polymer.pdf
-Protection spec:
-http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/BatteryProtection.pdf
-                                min     typical max
-    over-charge                 4.255   4.280   4.305
-    over-charge discover?       4.030   4.080   4.130
-    over-discharge              2.827   2.900   2.973
-    over-discharge discover     3.022   3.100   3.178
-
-ADC voltage monitor:    voltage divider 10K+10K(0.5)
-                        ADC=V*0.5/2.56*1024
-
-    V       ADC
-    ------------------
-    4.20    0x347(839)
-    3.10    0x26b(619)
-
-
-
-
-TROUBLE SHOOT
--------------
-07/16   After fix of voltage dividor on GPIO6, had a trouble that it could not send a char to BT module, though could receive.
-        Found R8 had wrong 1K resistor and changed to 10K, after that it can send to the module again. Not sure how it had sent with the wrong 1K before.
-
-07/18   On Linux, had an USB related trouble; keyobard or console didn't work for some reason. Changing PID cured this problem. Very annoying, took very long time before resolved it.
-
-12/07   rn42_rts() read 1 every time. R12 broke in open mode(no coductive), idk why, too much heat with soldering? and PF1 pin was not soldered.
-        It resolved with resoldering PF1 and new resistor on R12.
-
-
-
-
-Done:
-- low battery alert(solid light) 09/04
-- *** Rev.E BT test *** - DONE
-    - with MCP73832, new Schottky, tantalum caps - DONE 12/07
-        * MCP73832 doesn't leak from Vcc pin when unpluged and battery powered
-            34mV vs 2.07V(MCP73831) at Vcc pin
-            MCP73832 doesn't need revese protection diode D5
-        * PMEG2010ER is very low VF while reverse current/voltage is high
-            VF=0.96 vs 1.98(RB160M-30TR)with Fluke 175
-            Anode of D11 is 680mV vs 20mV(RB160M-30TR)
-            780mV is still low < 1.4V VBUS plugin detection(21.11)
-                this doesn't cause false VBUS detect
-                and 780mV on MCP73832 Vcc pin is also no problem.
-            D5 can be removed.
-    - ADC divider switching - DONE 12/07
-        * Drain and Source of Q4 Pch was reversed wrongly on Rev.E.
-
-    - reverse current from Lipo charger - DONE 12/07
-        * MCP73832 has no recverse current from Vcc pin unlike MCP73831
-
-
-- Rev.F design - DONE
-    - current measure point - DONE 12/08
-    - change value of cap 68->47    - DONE 12/08
-    - PPTC land pattern: no solder jumper, use 0Ohm resistor instead - CANCEL 12/08
-    - Q4 Pch FET: wrong Drain and Source - DONE 12/08
-    - D5 can be removed.    - DONE 12/08
-
-
-
-- BT_INDICATOR LED turns on wrongly when touching line or pin.  -- pull-up enabled on PF6/GPIO2 08/30
-- Lipo charger configuration: fast charge time:  USB charger spec? -- used 2kohm
-- use LED of charger to alarm low battery. LED should be powered directly from Lipo? - cancel; powered from VUSB
-- Use RTS in serial_uart.c to resolve missing chars from help message of RN-42 - done
-- CTS/RTS lines are needed? just connect in loop back if no flow control is needed. - done
-- add IO pin to charger status CHRG; LED control(low) and detect charge status(input HiZ) 07.24
-- LINKED: add trace on PIO2 to PF6   07.24
-- Lipo voltage ADC sensing
-- Lipo charger MCP73831: needs capacitor 4.7uF *2
-- USB connection check - 07.01
-- BT on/off check: whether RX line is pulled up? - checking RTS 07.01
-- USB/BT switching  BT is on -> BT, BT is off -> USB - 07.01
-- Under voltage lock out UVLO for protection of Lipo - Lipo has discharge protection at 3.100V    07.01
-- Power saving: HHKB scan, BT radio control - 9h with 850mAh, this is enough   07.01
-- Power selector doesn't work; Q4 MOSFET leaks from Lipo to USB power line. -- use Schottky instead 07/04