# HG changeset patch # User Mychaela Falconia # Date 1623560251 0 # Node ID f0d9a2cf15d2a6625421bc3301976a128f5d53b8 # Parent 3ead88660a4e7e9bb6a9cef18b2dbb8783c3504f FC-handset-spec: Venus peripherals documented diff -r 3ead88660a4e -r f0d9a2cf15d2 FC-handset-spec --- a/FC-handset-spec Sun Jun 13 04:10:21 2021 +0000 +++ b/FC-handset-spec Sun Jun 13 04:57:31 2021 +0000 @@ -1348,3 +1348,59 @@ will be possible: the battery will need to be connected to the orange power input connector, and the control signals for the charging circuit will need to be connected to the 2x4 header. + +3.5. LCD module and backlight + +It is the Mother's desire to finalize the selection of LCD module for the actual +handset before embarking on the detailed design (as in schematics, BOM and +layout) of FC Venus, and to implement the final LCD and the final backlight +circuit on the Venus board. + +3.6. Keypad buttons + +The complex mechanical arrangement of keypad buttons that will be needed for the +real handset will NOT be done on the Venus board. Instead there will be a +simple 5x5 matrix of buttons in rows and columns, with silk screen labels +indicating the function of each button, matching D-Sample - the same arrangement +as on our current Luna platform. There will also be 3 out-of-matrix buttons for +PWON, RPWON and RESET. + +There will be no keypad backlight on the Venus board. This secondary backlight +is not needed for firmware development, as it is not managed separately in our +fw architecture - instead its control will be absorbed into our R2D BLRR control +mechanism on the final handset where this backlight will be added. + +3.7. Audio interfaces + +Corresponding to the 3 audio channels of section 1.7, there will be 3 analog +audio interfaces on FC Venus: two TRRS jacks and one 2-pin header. These audio +interfaces will be as follows: + +* The main audio channel (the one that will go to the built-in earpiece speaker + and mic in the real handset) will be wired to a TRRS jack exactly like on + Caramel2. + +* The "official" headset channel (the one that will be a jack in the final + handset) will be wired to another identical TRRS jack. This other jack will + need plug insertion detection, signaled to a Calypso GPIO input. + +* The output of the loudspeaker amplifier (see section 1,7.2) will be wired to + a 2-pin header exactly like on FCDEV3B, allowing the same 8 ohm lab bench + loudspeaker to be connected. + +3.8. Magnetic buzzer + +There will be a magnetic buzzer implemented directly on the Venus board itself +(not an externally attached component), exactly like on TI's D-Sample board. +This buzzer will be controlled by Calypso BU/PWT output in the canonical manner, +allowing the expected sounds to actually emanate when firmware operates the +old-fashioned Calypso buzzer output. See section 2.4 for the purpose of this +hardware provision. + +3.9. LEDs instead of vibrator + +There will be no vibrator on FC Venus - it is a mechanical function which cannot +be sensibly implemented on a development board meant for use on a lab bench. +Instead our Venus board will feature both LPG and PWL LEDs (i.e., LEDs +controlled by the respective Calypso outputs) exactly like D-Sample, and either +of these LEDs can be used to simulate vibrator on/off state.