Overview
====

Attiny84
    flash: 8k
    eeprom: 512b
    ram: 512b
    io: 12 pins

Required I/O pins (13):
    digital
    ---
        7- LCD 
        1- button
        2- rx/tx
    analog
    ---
        1- THR
        1- AIL
        1- batt voltage


16x2 character lcd



ProfileCache - 84bytes - 14*6
    name - 12 bytes
    reversed - 1 byte
    flags - 1 byte





6 profiles: 56 bytes +24   80bytes
    name: 12 byte
    tx_mode: 1byte
    stick_modes: 1 byte
    reverse: 1 byte
    dualrate: 6 bytes (2bytes * 3)
    endpoints: 12 bytes (2bytes * 6)
    subtrim: 6 bytes (1byte * 6)
    switch: 2 bytes
    mixer: 15 bytes (5bytes * 3)
    swash: 3 bytes
    thr curve: 10bytes
    pitch curve: 10ytes


    //helicopter stuff: 23- 161bits = 23 * 7(twos complement values)


Memory
===

boot sequence
---
    - grab app settings from storage
    - load current/default profile from storage into Programmer
    - fetch current config from device
    - compare the two, if they differ, show flag on Main screen.





UI Concepts
====
"throttle up/down" scrolls the list.
"click" moves cursor to next value.
"right-stick left/right" adjust value under cursor.
"long press" navigates to next screen.
"double click" returns to main screen.


Workflows
====


Main screen
 0123456789012345
+----------------+          
|      high v11.9|            
|-thr- low !batt!|
|#2: plus copter |
+----------------+
dbl click: ->"Channels"
long press [with throttle cut]: ->"Profiles"

Channels
+----------------+
|[    |    |    ]|
|[    |    |    ]|
+----------------+

 0123456789012345
+----------------+
|###### CALIBRATE|
|######          |
+----------------+
|!!Calibrating!! |
|move stix fully |
+----------------+
dbl click: ->"Communication"
long press: calibrate start/stop


Profiles
 0123456789012345
+----------------+
|#1: model a     |
|nnRnnR ACRO  123|
+----------------+

throttle: profile select
button: select current model ->"Main Menu"
long press: ->"Edit Model" under cursor


Edit Model
 0123456789012345
+----------------+                  
|#1: model name  |                 
|MODE: mode2 LOAD|
+----------------+
throttle: cursor left/right
click: next value
r-stick left/right: next/prev char
long press: ->"Model EPA"
dbl click: ->"Main Menu"


Model EPA
+----------------+
|CH1 R DR:xxx/xxx|
|EP:xxx/xxx  +xxx|
+----------------+
throttle: channel select
click: next value
r-stick left/right: adjust value
long press: ->"Switches"
dbl click: ->"Main Menu"


Switches
+----------------+
|SW.A:dualrate   |
|SW.B:throttlecut|t
+----------------+
click: next value
r-stick left/right: adjust value
long press: -> "Mixes"
dbl click: ->"Main Menu"


Mixes
+----------------+
|MIX1 VRB>CH3 SWA|
|UP:+XXX  DN:+XXX|
+----------------+
throttle: scroll mix up/down
click: next value
r-stick left/right: adjust value
long press: -> "Type"


Type
 0123456789012345
+----------------+          
|TYPE: Heli-120  |
| +xxx/+xxx/+xxx |
+----------------+          
click: next value (Swash afr)
r-stick left/right: adjust value
long press: -> "Throttle Curve"


Throttle Curve
 0123456789012345
+----------------+          
|THR  ##### #####|
|norm1##### #####|
+----------------+          
throttle:  switch between THR and PTCH
button: next value
rstick: adjust vertical slider (0..100)
long press: -> "Edit Model"


Save
 0123456789012345
+----------------+          
|Save? Yes       |
|#1: xxxxxxxxxxx |
+----------------+
rstick: adjust value          
double click: abort ->"Main Menu"
long press: save if yes->"Main Menu"
click: save if yes ->"Main Menu"