Update MEMO.txt
tmk
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e4b9541041
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@ -1,27 +1,35 @@
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Roving RN-42
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============
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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.
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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.
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07/18 On Linux, had an USB related trouble; keyobard or console didn't work for some reason. Changing PID cured this problem. Very annoying, took very long time before resolved it.
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TODO
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----
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Power saving:
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- When not connected in a few minuts get into deep sleep to save battery life
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- CTS is needed for waking up from deep sleep? How deep sleep is activated?
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Improving:
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- Status LED; connecting, liked, low battery, sleeping, deep sleeping
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- Battry voltage display by command; like full(solid), medium(blink), low(flash)
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- move rn42 to protocol directory when it becomes reusable stack
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- LUFA sendchar should be buffered and serial_uart.c buffur size is too large(256).
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- Factroy reset doesn't work; need to test again. 10K pull-up is too high?
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- Lipo voltage ADC sensing
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- Lipo charger configuration: fast charge time: USB charger spec?
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- Low voltage alarm: LED indcates voltage of Lipo
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- CTS/RTS lines are needed? just connect in loop back if no flow control is needed.
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- CTS is needed for waking up from deep sleep?
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- Serial API callback when data are available/received(and when send buffer is available)
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- Serial API instance several serial ports can be used
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- DCDC converter: squeaky inducter with onsemi NCP1402
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- Lipo charger MCP73831: needs capacitor 4.7uF *2
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Testing:
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- Factroy reset doesn't work; need to **test again** 10K pull-up is too high?
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- Lipo voltage ADC value is not stabilized
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- DCDC converter: squeaky inducter; try other inductors
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- Keymap layer bug: during space is pressed(mousekey) press Fn(HHKB) then release space before Fn, in result HHKB layer is locked(toggled) unintentionally.
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DONE:
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- Lipo charger configuration: fast charge time: USB charger spec? -- used 2kohm
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- use LED of charger to alarm low battery. LED should be powered directly from Lipo? - cancel; powered from VUSB
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- Use RTS in serial_uart.c to resolve missing chars from help message of RN-42 - done
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- CTS/RTS lines are needed? just connect in loop back if no flow control is needed. - done
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- add IO pin to charger status CHRG; LED control(low) and detect charge status(input HiZ) 07.24
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- LINKED: add trace on PIO2 to PF6 07.24
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- Lipo voltage ADC sensing
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- Lipo charger MCP73831: needs capacitor 4.7uF *2
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- USB connection check - 07.01
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- BT on/off check: whether RX line is pulled up? - checking RTS 07.01
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- USB/BT switching BT is on -> BT, BT is off -> USB - 07.01
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@ -30,8 +38,20 @@ DONE:
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- Power selector doesn't work; Q4 MOSFET leaks from Lipo to USB power line. -- use Schottky instead 07/04
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TROUBLE SHOOT
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-------------
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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.
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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.
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07/18 On Linux, had an USB related trouble; keyobard or console didn't work for some reason. Changing PID cured this problem. Very annoying, took very long time before resolved it.
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Lipo
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----
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850mA lasts around 9 hours(07/28)
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Sparkfun Polymer Lithium Ion Battery 850mAh:
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https://www.sparkfun.com/products/341
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Lipo Cell spec:
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@ -46,6 +66,7 @@ over-discharge discover 3.022 3.100 3.178
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ADC voltage monitor: voltage divider 10K+10K(0.5)
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ADC=V*0.5/2.56*1024
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V ADC
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------------------
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4.20 0x347(839)
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@ -134,7 +155,9 @@ R,1 reboot
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Apple iOS
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---------
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Cannot supported without apple iAP authentication chip.
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Keyboard can be used with iPhone, but mouse cannot.
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To operate iOS with keyboard is not so useful, though.
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There may be iOS specific scancodes?
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HID flag register
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@ -158,6 +181,7 @@ GH
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0100: Joystick
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1xxx: reserved
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Out report - Indicator
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----------------------
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0xFE 0x02 0x01 <LED_state>
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