pub fn into_blocking(self) -> Spi<'d, Blocking> {
        crate::interrupt::disable(Cpu::current(), self.driver().info.interrupt);
        Spi {
            spi: self.spi,
            _mode: PhantomData,
            guard: self.guard,
            pins: self.pins,
        }
    }
Converts the SPI instance into blocking mode.
esp-hal/src/spi/master.rs