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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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