Add support for SPI slave mode #259
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Slave mode needs explicit support for the slave select pins to work, and since there are multiple per peripheral, we need a trait to identify them.
I'm about to add support for slave mode, which will require a second enable method.
Once support for slave mode is added, there will no longer be a clear default.
Those are going to be reused by slave mode initialization.
They are not used, and the restrictions they provide are redundant. The function types are already restricted to those used in the `Instance` trait and a `Function` cannot be assigned without all the right traits being there anyway.
This helps when using an IDE that shows you the name of the arguments when writing a function call.
Some of these are required to operate slave mode, but they're available in master mode and might be useful there too.
david-sawatzke
approved these changes
Jul 23, 2020
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