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