Create S-Band Subsystem Handler

[DrakBoul]

Description

A handler needs to be created for sending telecommands, reading telemetry, and sending bulk downlink data via spi to the S-Band transmitter. To accomplish this the handler must do a few things, have I2C interface for sending telecommands and reading telemetry, have ipc server to connect to cmd dispatcher so commands can be sent to it via tall thin data pipeline, spi interface for writing to the transmitters "transmit buffer".

I2C Interface

The documentation for the clydespace S-Band transciever clearly defines a means of configuring and reading housekeeping and status from the S-Band tx. Using this documentation and our I2C interface this can easily be implemented.

SPI Inteface

As of now the SPI Interface does not exist, but is soon going to be created #75. This interface is tasked with loading the tx buffer of the S-Band transmitter with data to be downlinked. From what I know already the SPI can be operated in half duplex mode since we do not recieve any data from the S-Band transmitter using SPI, instead this is done using the I2C interface.

Deliverables

• Create SPI interface module Create Rust SPI Interface #75
• Use SPI, I2C, and IPC to have handler talk to both S-Band and tall thin data pipeline
• Implement state machine for S-Band during operation
• Test S-Band handler with tall thin data pipeline and S-Band Transmitter.