SRAM Support

[kb1lqd]

Add SRAM device support that allows use of the SRAM hardware. Byte buffers input and output should be supported as should full defined packet buffers if desired.

Implementation Plan

• Create high level input/output/query functions
• Implement SPI peripheral support using driverlib (create issue ticket to track work)
• Implement low-level read function
• Implement low-level write function
• Implement basic self-test function to verify operation

Prior SRAM Faraday code is located here: https://github.com/FaradayRF/Faraday-Firmware/tree/master/SRAM

It would be wise to adapt these functions to driverlib to minimize rework.

Likely the best approach to start is to"

• Implement basic CS toggling function to select device and reset
• Implement "read settings"
• Implement "write settings"
• Implement basic byte writing/reading
• Implement the sequential byte writing/reading