SPI needs setClockDivider

[nseidle]

Attempting to run SparkFun BME280 library failed because

C:\Dropbox\Apps\Arduino\libraries\arduino_173658\src\SparkFunBME280.cpp: In member function 'uint8_t BME280::begin()':
C:\Dropbox\Apps\Arduino\libraries\arduino_173658\src\SparkFunBME280.cpp:98:7: error: 'class 
SPIClass' has no member named 'setClockDivider'
    SPI.setClockDivider(SPI_CLOCK_DIV32);

[nseidle]

FWIW it's not recommended for use in new projects: https://www.arduino.cc/en/Reference/SPISetClockDivider

[nseidle]

Notes to myself: we're not respecting LSB MSB settings. I believe the HAL has MSB hardcoded:

Page 321 of datasheet shows bit 23 controls MSB/LSB so we should be able to manipulate it. I know there are bit wise operators in the HAL...

[nseidle]

Register access helper macros:

[nseidle]

The macro helper functions are defined in v2.2 of HAL so we don't have access to them but the AM_REGVAL is available and seems to be working.

[nseidle]

Should be fixed in PR #30.

[oclyke]

All this is taken care of now. Thanks!