Fix formatting
Generalise ssc options
Remove tx_or_rx
Pass ssc as first arg
Tx/rx buffer of data
Add ssc_read_ready_p
Fix ssc_read_ready_p
Enable selected modules
Set clock speed similar to spi
Unify names
Read/write 8 / 16 / 32
Remove ssc_module.h
Specify period in clocks
Read/write 8 / 16 / 32