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-Memo of deveopment
-==================
-just memo, NOT WORTH READING
-
-2015/11/24
-JP Bluetooth:
- RN-42 cannot send Japanese keys like; henkan, mu-henkan and kana, JPY and RO.
- It seems HID usage more than 0x65 cannot be send with the module.
- http://shiki.esrille.com/2014/07/bluetoothnisse.html
-
-
-Bug:
-- Factory Reset PIO4 doesn't work
- - the reason is unclear - 12/08 NOT LOOK INTO ANY MORE
- - WORKAROUND: use serial pins(3.3V, GND, RX and TX)
- - SF,1 and R,1 to set factory defalult
-
-
-Todo:
-- LED cover and switch knob and new Slide Switch
-- RN42 auto configuration
- - configure the module as HID device every time powering up
- - this'll reduce work load of assembly
-
-- move rn42 to protocol directory when it becomes reusable stack
-
-- sendchar() in lufa.c no buffer
- - no buffering. character lost can be caused.
-- LUFA sendchar should be buffered and serial_uart.c buffur size is too large(256).
-
-- BT operations
- - disconnect
- - new connection
- - remove connection
-
-- sendchar() in lufa.c block loop - DONE 11/29
- - block loop when powered with AC adapter
- - FrameNumber is not updated when adapter powered
-
-Improving:
-- ADC resolution
- AVR120
- AVR32138
- - Enhancing ADC resolution by oversampling
- AVR121 http://www.atmel.com/images/doc8003.pdf
- - disable digital input buffer DIDR(7.8.6)
-
-Design:
-- suspend.h - DONE 11/26
- - remove argument from suspend_power_down() for backward compatitibility
-- remove MCU dependent power saving code from core/keyboard - DONE 11/23
- - it should be located in project matrix.c
-- HHKB matrix.c needs matrix_prev?
- - is_modified() is obsolete now. really needs?
-- ADC: removing AREF capacitor C10
- - seems to be better while usb powered
- - still bad while battery powered
- http://electronics.stackexchange.com/questions/105849/avcc-and-capacitor-using-adc
-- ADC: smaller resistors for voltage dividor
- - 1K + 1K: not improved. - 11/27
-
-
-LUFA:
-USB connection check: state of USB deivce
-- USB_DeviceState:
- USB_Deivce_State_t { Unattached, Powered, Default, Addressed, Configured*, Suspended* }
- Unattached: unpluged
- Powered: pluged with power adapter
- Default: enumerate process bigin
- Addressed: addressed
- Configured: enumerated
- Suspended: suspended
-
-- USB_IsInitialized: state of LUFA core setup
- becomes true in USB_Init() USBController_AVR8.c
- becomes false in USB_Disable() USBController_AVR8.c
-- USB_VBUS_GetStatus(): state of VBUS(power/connection)
-- USB_Disable() detaches, disables all interrupts, controller, PLL, regulater.
-
-- When connect to power adapter
- - event happened: CW or CSW or C or DDC
- - USB state: not configured
-
-- USB evnets
- - USB connect: CSWRWRW
- - USB connect but fail to enumeration: CWRWRWRWS
- - USB disconnect: D
- - Power adapter connect: CW, CSW, C
- - Power adapter disconnect: D
-
-
-Power saving:
-- Pro2 current consumption
- - active: 138.2mA(no device on Hub)
- - suspended: 30.9mA(WakeUp enabled DIPSW6)
- - suspended: 0mA->46.0mA(WakeUp disabled DIPSW6)
-- Pro current consumption
- - active: 54.0mA
- - suspended: 40.5mA(WakeUp enabled DIPSW6)
- - suspended: 0.3mA(WakeUp disabled DIPSW6)
-
-- RN42 3.3V
- - disconnected(Idle): 5mA (config mode)
- - connected(Active):
- SW,0000: 23-26mA
- SW,0010: 27-29mA worse than 0000 for unknown reason
- SW,0020: 17-19mA mouse NG
- SW,0030: 13-16mA laggy mouse NG
- SW,0050: 10-13mA laggy mouse NG
-
-- matrix power saving
- - power saving while externally powered and not while unpluged
-- confirm suspend mode lufa.c: matrix_power_*, suspend_wakeup_condition
-- 8MHz clock
-- When not connected in a few minutes get into deep sleep to save battery life
-- CTS is needed for waking up from deep sleep? How deep sleep is activated?
-- firmware controlled 3.3V DC converter to switch on/off BT module
-- sleep MCU and BT module(keyboard is not used)
-- deep sleep MCU and BT module(keyboard is not used for long time)
-- deep sleep MCU and turn off BT module(keyboard is not used and not connected)
-- Battery ADC; switching, high resistance
- - switching gnd end of divider with PF4
- - high resistor 100K/1M?
- capacitor 10nF
- http://www.eevblog.com/forum/beginners/measuring-battery-voltage-without-consuming-current/
-- During USB suspend change clock source to internal RC from external Xtal(6.8)
-- FRZCLK: you can freeze clock for power saving. still WAKEUPI and VBUSTI interrupts are available while freezing.(21.7.3)
-- Suspend: Clear Suspend Bit, Freeze clock, disable PLL, MCU sleep(21.13)
-- Voltage reference(8.1.1)
- - to reduce power consumption while power down mode
-- unset ADEN before sleep(24.7)
-
-
-
-
-
-
-
-Lipo
-----
-850mA lasts around 9 hours(07/28)
-
-Sparkfun Polymer Lithium Ion Battery 850mAh:
-https://www.sparkfun.com/products/341
-Lipo Cell spec:
-https://www.sparkfun.com/datasheets/Batteries/063048%20Li-polymer.pdf
-Protection spec:
-http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/BatteryProtection.pdf
- min typical max
- over-charge 4.255 4.280 4.305
- over-charge discover? 4.030 4.080 4.130
- over-discharge 2.827 2.900 2.973
- over-discharge discover 3.022 3.100 3.178
-
-ADC voltage monitor: voltage divider 10K+10K(0.5)
- ADC=V*0.5/2.56*1024
-
- V ADC
- ------------------
- 4.20 0x347(839)
- 3.10 0x26b(619)
-
-
-
-
-TROUBLE SHOOT
--------------
-07/16 After fix of voltage dividor on GPIO6, had a trouble that it could not send a char to BT module, though could receive.
- Found R8 had wrong 1K resistor and changed to 10K, after that it can send to the module again. Not sure how it had sent with the wrong 1K before.
-
-07/18 On Linux, had an USB related trouble; keyboard or console didn't work for some reason. Changing PID cured this problem. Very annoying, took very long time before resolved it.
-
-12/07 rn42_rts() read 1 every time. R12 broke in open mode(no coductive), idk why, too much heat with soldering? and PF1 pin was not soldered.
- It resolved with resoldering PF1 and new resistor on R12.
-
-
-
-
-Done:
-- low battery alert(solid light) 09/04
-- *** Rev.E BT test *** - DONE
- - with MCP73832, new Schottky, tantalum caps - DONE 12/07
- * MCP73832 doesn't leak from Vcc pin when unpluged and battery powered
- 34mV vs 2.07V(MCP73831) at Vcc pin
- MCP73832 doesn't need revese protection diode D5
- * PMEG2010ER is very low VF while reverse current/voltage is high
- VF=0.96 vs 1.98(RB160M-30TR)with Fluke 175
- Anode of D11 is 680mV vs 20mV(RB160M-30TR)
- 780mV is still low < 1.4V VBUS plugin detection(21.11)
- this doesn't cause false VBUS detect
- and 780mV on MCP73832 Vcc pin is also no problem.
- D5 can be removed.
- - ADC divider switching - DONE 12/07
- * Drain and Source of Q4 Pch was reversed wrongly on Rev.E.
-
- - reverse current from Lipo charger - DONE 12/07
- * MCP73832 has no recverse current from Vcc pin unlike MCP73831
-
-
-- Rev.F design - DONE
- - current measure point - DONE 12/08
- - change value of cap 68->47 - DONE 12/08
- - PPTC land pattern: no solder jumper, use 0Ohm resistor instead - CANCEL 12/08
- - Q4 Pch FET: wrong Drain and Source - DONE 12/08
- - D5 can be removed. - DONE 12/08
-
-
-
-- BT_INDICATOR LED turns on wrongly when touching line or pin. -- pull-up enabled on PF6/GPIO2 08/30
-- Lipo charger configuration: fast charge time: USB charger spec? -- used 2kohm
-- use LED of charger to alarm low battery. LED should be powered directly from Lipo? - cancel; powered from VUSB
-- Use RTS in serial_uart.c to resolve missing chars from help message of RN-42 - done
-- CTS/RTS lines are needed? just connect in loop back if no flow control is needed. - done
-- add IO pin to charger status CHRG; LED control(low) and detect charge status(input HiZ) 07.24
-- LINKED: add trace on PIO2 to PF6 07.24
-- Lipo voltage ADC sensing
-- Lipo charger MCP73831: needs capacitor 4.7uF *2
-- USB connection check - 07.01
-- BT on/off check: whether RX line is pulled up? - checking RTS 07.01
-- USB/BT switching BT is on -> BT, BT is off -> USB - 07.01
-- Under voltage lock out UVLO for protection of Lipo - Lipo has discharge protection at 3.100V 07.01
-- Power saving: HHKB scan, BT radio control - 9h with 850mAh, this is enough 07.01
-- Power selector doesn't work; Q4 MOSFET leaks from Lipo to USB power line. -- use Schottky instead 07/04
-
-- wrongly suspended when powered from adapter without USB connection - DONE
- - suspend event may occur when plug into adapter
- - and never wake until conected to real USB line
- - without debug print via USB no problem; CSW(wake just after suspend as real USB line)
- - seems like USB print causes this problem after suspended
-
-- lose USB connection during power-down mode - DONE
- - USB initialize code in main() causes this - WRONG
- - Do not power-down during USB connection is active - DONE 11/11
- (USB_DeviceState == USB_DEVICE_Configured) is used to check USB connection
- matrix_power_down() matrix.c - 11/23
-
-- with Nexus5 keyboard and mouse are very laggy.
- Not confirmed. 01/15
-
-- switch BT host connections - CANCEL 01/15
- - switch next connection
- cannot switch connection with version 6.15 at least
-
-- When given power only from wall wart adapter - DONE? not confirmed 01/15
- - it sleeps. it should not sleep
- - Configured state without USB connection?
-
-- timer is slow while power down - DONE 11/26
- - time out interrupt is lost while power down?
- - interrupt of watchdog timer compensates timer counter(avr/suspend.c)
-
-- repeated CHARGING/FULL_CHARGED - No longer problem 01/15
- - In LTC sharp pulses are observed.
- - MCP has no pulse but still has a problem.
- - needs more wait before read pin state? - NO
-
-- USB plug-in fails while BT - No longer problem 01/15
- - it ends in suspend state
- - maybe, not responsive to host enumeration process due to power-down.
- - matrix_power_down() only when state is unattached - 11/26
- - need to observe a while
-