Macro tm4c123x_hal::i2c::i2c_busy_wait

macro_rules! i2c_busy_wait {
    ($i2c:expr $(, $field:ident, $op:ident)? ) => { ... };
}

Spins until the controler is ready (mcs.busy is clear) and optionally on another field of the mcs register until it is clear or set (depending on op parameter).