Update MEMO
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@ -9,33 +9,84 @@ Bug:
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- Do not power-down during USB connection is active - DONE 11/11
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(USB_DeviceState == USB_DEVICE_Configured) is used to check USB connection
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matrix_power_down() matrix.c - 11/23
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- When given power only from wall wart adapter
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- it sleeps. it should not sleep
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- Configured state without USB connection?
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- timer is slow while power down - DONE 11/26
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- time out interrupt is lost while power down?
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- interrupt of watchdog timer compensates timer counter(avr/suspend.c)
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- USB plug-in while BT failes
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- it ends in suspend state
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- maybe, not responsive to host enumeration process due to power-down.
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- matrix_power_down() only when state is unattached - 11/26
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- need to observe a while
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- repeated CHARGING/FULL_CHARGED
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- In LTC sharp pulses are observed.
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- MCP has no pulse but still has a problem.
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- needs more wait before read pin state?
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- wrongly suspended when powered from adapter without USB connection
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- suspend event may occur when plug into adapter
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- and never wake until conected to real USB line
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- without debug print via USB no problem; CSW(wake just after suspend as real USB line)
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- seems like USB print causes this problem after suspended
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Todo:
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- sendchar() in lufa.c block loop - 11/29
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- block loop when powered with AC adapter
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- FrameNumber is not updated when adapter powered
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- sendchar() in lufa.c no buffer
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- no buffering. character lost can be caused.
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Design:
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- suspend.h - DONE 11/26
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- remove argument from suspend_power_down() for backward compatitibility
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- remove MCU dependent power saving code from core/keyboard
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- it should be located in project matrix.c - DONE 11/23
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- remove MCU dependent power saving code from core/keyboard - DONE 11/23
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- it should be located in project matrix.c
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- HHKB matrix.c needs matrix_prev?
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- is_modified() is obsolete now. really needs?
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- ADC: removing AREF capacitor C10
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- seems to be better while usb powered
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- still bad while battery powered
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http://electronics.stackexchange.com/questions/105849/avcc-and-capacitor-using-adc
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- ADC: smaller resistors for voltage dividor
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- 1K + 1K: not improved. - 11/27
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LUFA:
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USB connection check: state of USB deivce
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- USB_DeviceState:
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USB_Deivce_State_t { Unattached, Powered, Default, Addressed, Configured*, Suspended* }
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Unattached: unpluged
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Powered: pluged with power adapter
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Default: enumerate process bigin
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Addressed: addressed
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Configured: enumerated
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Suspended: suspended
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- USB_IsInitialized: state of LUFA core setup
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becomes true in USB_Init() USBController_AVR8.c
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becomes false in USB_Disable() USBController_AVR8.c
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- USB_VBUS_GetStatus(): state of VBUS(power/connection)
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- USB_Disable() detaches, disables all interrupts, controller, PLL, regulater.
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- When connect to power adapter
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- event happened: CW or CSW or C or DDC
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- USB state: not configured
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- USB evnets
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- USB connect: CSWRWRW
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- USB connect but fail to enumeration: CWRWRWRWS
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- USB disconnect: D
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- Power adapter connect: CW, CSW, C
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- Power adapter disconnect: D
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Power saving:
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- matrix power saving
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- power saving while externally powered and not while unpluged
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- confirm suspend mode lufa.c: matrix_power_*, suspend_wakeup_condition
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- 8MHz clock
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- When not connected in a few minutes get into deep sleep to save battery life
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@ -63,6 +114,9 @@ Improving:
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- ADC resolution
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AVR120
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AVR32138
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- Enhancing ADC resolution by oversampling
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AVR121 http://www.atmel.com/images/doc8003.pdf
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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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