Faster SPI

[robertinant]

From @rei-vilo on October 18, 2014 20:5

SPI speed tops at 8 MHz while MCUs have much faster clock speeds —e.g. 80 MHz for the LM4F120 / TM4C123 and the CC3200 120 MHz for the TM4C129.

How to get 16 MHz for SPI?

Copied from original issue: energia/Energia#497

[robertinant]

From @ecdr on October 28, 2014 5:51

Even worse - I believe the speed for the current Energia SPI library for Tiva tops out at 4MHz?

In fixing this - is it desirable/necessary for the Energia SPI library on Tiva to continue to produce the same speeds as it currently does when given the SPI_CLOCK_DIV2 arguments?
(i.e. does it need to be kept backwards compatible, either with those macro names, or with the actual argument values to setClockDivider, or is a patch which changes the meanings okay (e.g. to make them more compatible with Arduino, MSP430 or CC3200))

[robertinant]

From @rei-vilo on July 8, 2015 18:23

Same feature request for the MSP432, especially with the Kentec 3.5" SPI screen.