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Power Saving
============
MCU+HHKB Power Comsumption
--------------------------
Battery drive:
idle 18.9mA
active 35.8mA
USB powered:
40.0mA
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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