GitLab

* first pass at tinyble variant

* TinyBLE: fix name

* TinyBLE: board fixes

* TinyBLE: fix crystal

* TinyBLE: board fixes

* TinyBLE: fix pins

* TinyBLE: add to tests

* TinyBLE: fix default programmer

* TinyBLE: fix default programmer

* fix NUM_DIGITAL_PINS based on current understand of rules

* Add SDA and SCL pin constants to variant definitions

* consolidating custom .interface keys to more standard .protocol keys

* platform.txt fix spelling

* fix microbit target

Remove unused interrupt from nRF51 Wire lib

Add SDA and SCL pin constants to variant definitions.

Linux install instructions

Fix RTC1 EVTENSET/INTENSET and RTC1_IRQHandler

Set CMSIS-DAP as the default uploader for the micro:bit

micro:bit new website

the micro:bit site has changed to the one given in this PR

  - Correction of EVTENSET/INTENSET

Set microbit build.board value

README.md: clarify windows driver setup

Allow access to the 8 analog inputs (VS 6 previously).

Use GPIO_PIN_CNF_DRIVE_S0D1 for Wire lib pin configurations

Add docs about Low Frequency Clock Source

LF CLCK source cleanup

Add RedBear BLE Nano 2 variant

LFCLK source was hard-coded to be RC oscillator, now supports all other
sources from the tools menu

Add note about installation time

Add RedBear Blend 2 variant

* change a bit shifting operation to reflect the fact the RTC is 24 bits, not 32.
* enable the overflow interrupt correctly