Add spi config mutation methods

Author: Sh3Rm4n

src/spi/config.rs

@@ -4,6 +4,7 @@ use crate::time::rate::{self, Extensions};
 use core::fmt;
 
 use crate::hal::spi::{self, Mode};
+use crate::time::rate::Generic;
 
 /// Configuration struct for [`Spi`](super::Spi) providing all
 /// communication-related / parameters.
@@ -43,6 +44,19 @@ pub struct Config {
     pub mode: Mode,
 }
 
+impl Config {
+    /// Set the operating frequency of the SPI
+    pub fn frequency(mut self, frequency: impl Into<Generic<u32>>) -> Self {
+        self.frequency = frequency.into();
+        self
+    }
+    /// Set the Operation Mode
+    pub fn mode(mut self, mode: Mode) -> Self {
+        self.mode = mode;
+        self
+    }
+}
+
 impl fmt::Debug for Config {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let mode = if self.mode == spi::MODE_0 {

testsuite/tests/spi.rs

@@ -10,9 +10,10 @@ use hal::prelude::*;
 
 use hal::gpio::{PushPull, AF6};
 use hal::gpio::{PC10, PC11, PC12};
+use hal::hal::spi::MODE_0;
 use hal::pac;
 use hal::pac::SPI3;
-use hal::spi::Spi;
+use hal::spi::{config::Config, Mode, Phase, Polarity, Spi};
 use hal::time::rate::{self, Extensions};
 
 const TEST_MSG: [u8; 8] = [0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0xaa, 0xbb];
@@ -95,4 +96,19 @@ mod tests {
             state.spi = Some(spi);
         }
     }
+
+    #[test]
+    fn config_builder() {
+        let config = Config::default();
+
+        assert!(config.frequency == 1.MHz().into());
+        assert!(config.mode == MODE_0);
+
+        let config = config.frequency(1.MHz()).mode(Mode {
+            polarity: Polarity::IdleLow,
+            phase: Phase::CaptureOnFirstTransition,
+        });
+
+        assert!(config == Config::default());
+    }
 }