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Power Saving
============
MCU+HHKB Power Comsumption
--------------------------
Battery drive:
idle 18.9mA
active 35.8mA
USB powered:
40.0mA
52mA 01/17
Other keyboards:
HHKB Pro 55mA
HHKB Pro2 140mA
HHKB Pro 42mA(Alt)
HHKB Pro2 52mA(Alt BT controller USB mode)
HHKB Pro2 88mA(Alt BT controller BT mode connected)
HHKB Pro2 68mA(Alt BT controller BT mode config mode)
Poker X 6mA
Infinity 24mA(TMK)
65mA(kiibohd)
HHKB key switch power control
-----------------------------
MOS FET Nch: BSS138 or IRLML6344T, either works and no apparent difference.
Normally on(pull-up) or off(pull-down)? interms of power saving it prefers pull-down?
Pull-down will be better for power saving, normally off.
Used Timer
----------
8MHz clock
----------
1) 16MHz xtal with system prescaler div2: F_CPU=8MHz, F_USB=16MHz
2) 8MHz xtal with div1: F_CPU=8MHz, F_USB=8MHz
Hardware USART doesn't work at 115200bps with 8MHz(F_CPU).
workaround:
a) use Sotwre serial for communcation with RN-42
b) reduce baud of RN-42 to lower rate;(factory default is 115200bps)
10/03
Slave mode
----------
Discovery/Inquire
Connect/Page
SI,0012
SJ,0012
InqWindw=0100
PagWindw=0100
Sniff mode
----------
0.625ms * <hex>
SW,0320 Very sluggish. Type is not lost but very slow to register.
SW,0160 Still sluggish. may transposed? can type but ...
Mouse point move intermittently
SW,0020 feel a bit late like stumble(20ms)
SW,0010 feel no latency(10ms)
Deep sleep
----------
SW,8010
TX power
--------
SY,fff4
IO pins
-------
S%,1000 status led and connection control don't work
GPIO5: status LED
GPIO6: Connection control
GPIO2: linked status
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