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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