Roving RN-42
============
-TODO
-----
+Bug:
+- with Nexus5 keyboard and mouse are very laggy.
+
+- lose USB connection during power-down mode
+ - 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
+
+Todo:
+
+Design:
+- remove MCU dependent power saving code from core/keyboard
+ - it should be located in project matrix.c - DONE 11/23
+- HHKB matrix.c needs matrix_prev?
+ - is_modified() is obsolete now. really needs?
+
+
+LUFA:
+USB connection check: state of USB deivce
+- USB_DeviceState:
+ USB_Deivce_State_t { Unattached, Powered, Default, Addressed, Configured*, 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.
+
+
Power saving:
-- When not connected in a few minuts get into deep sleep to save battery life
+- 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)
Improving:
-- Status LED; connecting, liked, low battery, sleeping, deep sleeping
-- Battry voltage display by command; like full(solid), medium(blink), low(flash)
+- BT LED; connecting, linked, sleeping, deep sleeping
+- Battry LED; blink(using timer?)
- move rn42 to protocol directory when it becomes reusable stack
- LUFA sendchar should be buffered and serial_uart.c buffur size is too large(256).
-- keyboard LED update
+- ADC resolution
+ AVR120
+ AVR32138
Testing:
- Factroy reset doesn't work; need to **test again** 10K pull-up is too high?
- Keymap layer bug: during space is pressed(mousekey) press Fn(HHKB) then release space before Fn, in result HHKB layer is locked(toggled) unintentionally.
+Done:
+- low battery alert(solid light) 09/04
+
+
+Power routing
+-------------
+Current:
+(USB) +---(Lipo)
+ | | |
+ | | +------+ DPDT
+ | | |Switch/-----------------------+
+ | | +------+ |
+ | +-------+ | |
+ +-|Charger| | |
+ | +-------+ | +---+ |
+ | | |MCU| |
+ | | +---+ |
+ | | | |
+ | | | |
++--------------+ +-----+ +------+ +---/--+ +-----+
+|Power Selector|--|DC 5V|--|DC3.3V|---|Switch|----|RN-42|
++--------------+ +-----+ +------+ +------+ +-----+
+USB Power is boosted unnecessarily, not harmful?
+
+Idea 1:
+(USB) +---(Lipo)
+ | | |
+ | | +------+ DPDT
+ | | |Switch/----------+
+ | | +------+ |
+ | +-------+ | |
+ +-|Charger| | |
+ | +-------+ | +---+ |
+ | +-----+ |MCU| |
+ | |DC 5V| +---+ |
+ | +-----+ | |
+ | | | |
++--------------+ | +---/--+ +------+ +-----+
+|Power Selector|-----+---|Switch|----|DC3.3V|-----|RN-42|
++--------------+ +------+ +------+ +-----+
+To enable BT when USB powered it still needs to turn siwtch on, Lipo consumes quinscent current at 5V converter in vain.(Not good)
+
+Idea 2:
+(USB) +---(Lipo)
+ | | |
+ | | +------+
+ | | |Switch|
+ | | +------+
+ | +-------+ |
+ +-|Charger| |
+ | +-------+ | +---+
+ | +-----+ |MCU|----+ Controlled by firmware
+ | |DC 5V| +---+ | On: Lipo powered
+ | +-----+ | | Off: USB powered
+ | | | |enable
++--------------+ | +------+ +-----+
+|Power Selector|-----+---|DC3.3V|-----|RN-42|
++--------------+ +------+ +-----+
+MCU can controlled power of RN-42 without hardware switch.
+When USB powered and switch is on Lipo consumes quinscent current at 5V converter in vain.(Not good)
+
+Idea 3:
+(USB) +---(Lipo)
+ | | |
+ | | +------+
+ | | |Switch|SPST(or without)
+ | | +------+
+ | +-------+ |
+ +-|Charger| |
+ | +-------+ | +---+
+ | | |MCU|----+ Controlled by firmware
+ | | +---+ | On: Lipo powered
+ | | | | Off: USB powered
+ | | | |enable
++--------------+ +-----+ +------+ +-----+
+|Power Selector|-|DC 5V|-|DC3.3V|-----|RN-42|
++--------------+ +-----+ +------+ +-----+
+Switch is needed to save Lipo when not used because decent power saving is not available now. If firmware can turn off BT module completely and make MCU deep sleep the switch will be not even needed.
+
+
+
+
+
DONE:
+- 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
SM,6 automatically reconnect(Mode =Pair)
confirm: auto connect works well but difficult to enter command mode.
+SR,Z removes all remote addresses for reconnecting.
+ can be used to connect another host
+SR,I registers last inquiry address
+
Fast data mode
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projects / tmk_firmware.git / blobdiff