#354 brown out parameters

[Andrey B]

Need to figure out default brown out and check if adjustments are needed

[Andrey B]

https://stm32f4-discovery.net/2015/08/hal-library-22-bor-for-stm32fxxx/

https://github.com/MaJerle/stm32fxxx_hal_libraries

[Andrey B]

New commands:
get bor
set bor X
where X is 0, 4, 8 or 12

default value is still 12 - OB_BOR_OFF - for now, until we have progress on confirming if that's an issue or not

define OB_BOR_LEVEL3 ((uint8_t)0x00) /!< Supply voltage ranges from 2.70 to 3.60 V /
define OB_BOR_LEVEL2 ((uint8_t)0x04) /!< Supply voltage ranges from 2.40 to 2.70 V /
define OB_BOR_LEVEL1 ((uint8_t)0x08) /!< Supply voltage ranges from 2.10 to 2.40 V /
define OB_BOR_OFF ((uint8_t)0x0C) /!< Supply voltage ranges from 1.62 to 2.10 V /

11518

[Andrey B]

OB_BOR_LEVEL1 set as default as of 20170218