spi: move set_format to all states

There are other drivers in the wild (uboot, zephyr) that set the format
without disabling the peripheral, so we’ll assume it is fine to do so.

rp2040-hal/src/spi.rs

@@ -247,26 +247,9 @@ impl<S: State, D: SpiDevice, P: ValidSpiPinout<D>, const DS: u8> Spi<S, D, P, DS
         // Return the frequency we were able to achieve
         (freq_in / (prescale as u32 * (1 + postdiv as u32))).Hz()
     }
-}
-
-impl<D: SpiDevice, P: ValidSpiPinout<D>, const DS: u8> Spi<Disabled, D, P, DS> {
-    /// Create new not initialized Spi bus. Initialize it with [`.init`][Self::init]
-    /// or [`.init_slave`][Self::init_slave].
-    ///
-    /// Valid pin sets are in the form of `(Tx, Sck)` or `(Tx, Rx, Sck)`
-    ///
-    /// If you pins are dynamically identified (`Pin<DynPinId, _, _>`) they will first need to pass
-    /// validation using their corresponding [`ValidatedPinXX`](ValidatedPinTx).
-    pub fn new(device: D, pins: P) -> Spi<Disabled, D, P, DS> {
-        Spi {
-            device,
-            pins,
-            state: PhantomData,
-        }
-    }
 
     /// Set format and datasize
-    fn set_format(&mut self, data_bits: u8, frame_format: FrameFormat) {
+    pub fn set_format(&mut self, data_bits: u8, frame_format: FrameFormat) {
         self.device.sspcr0().modify(|_, w| unsafe {
             w.dss().bits(data_bits - 1).frf().bits(match &frame_format {
                 FrameFormat::MotorolaSpi(_) => 0x00,
@@ -288,6 +271,24 @@ impl<D: SpiDevice, P: ValidSpiPinout<D>, const DS: u8> Spi<Disabled, D, P, DS> {
         });
     }
 
+}
+
+impl<D: SpiDevice, P: ValidSpiPinout<D>, const DS: u8> Spi<Disabled, D, P, DS> {
+    /// Create new not initialized Spi bus. Initialize it with [`.init`][Self::init]
+    /// or [`.init_slave`][Self::init_slave].
+    ///
+    /// Valid pin sets are in the form of `(Tx, Sck)` or `(Tx, Rx, Sck)`
+    ///
+    /// If you pins are dynamically identified (`Pin<DynPinId, _, _>`) they will first need to pass
+    /// validation using their corresponding [`ValidatedPinXX`](ValidatedPinTx).
+    pub fn new(device: D, pins: P) -> Spi<Disabled, D, P, DS> {
+        Spi {
+            device,
+            pins,
+            state: PhantomData,
+        }
+    }
+
     /// Set master/slave
     fn set_slave(&mut self, slave: bool) {
         if slave {