OBP40 
=====

Important information: 

***************************************************
THIS BRANCH IS NOT INTENDED TO MERGE INTO "master"!
***************************************************

platformio.ini adapted to compile directly. For compile use matching
environent:
    pio run -e obp40

for upload to device:
    pio run -e obp40 -t upload

Differences to OBP60
--------------------

- no GPS
- no RTC
- no LEDs
- no environment sensor
- no key lock
- no swipe
- only 5 keys

+ SD card interface


GPIO assignments
----------------

NMEA0183
  IO9  - RS485 TX
  IO14 - RS485 RX

NMEA2000/CAN
  IO15 - CAN TX
  IO16 - CAN RX


Keyboard
--------

Keycode   Key              Function
-------- ---------------- -------------------------
  1       Menu key         Key 1 of OBP60 (left)
  2       Exit key         Key 2 of OBP60
  3       Jog-Dial press
  9       Jog-Dial down    Next page
 10       Jog-Dial up      Previous page