V3 is just an extension of V2, merge modules.

embassy-stm32/src/crc/v2.rs

@@ -1,5 +1,5 @@
-use crate::pac::CRC as PAC_CRC;
 use crate::pac::crc::vals;
+use crate::pac::CRC as PAC_CRC;
 use crate::peripherals::CRC;
 use crate::rcc::sealed::RccPeripheral;
 
@@ -9,14 +9,16 @@ pub struct Crc {
 }
 
 pub enum CrcConfigError {
-    InvalidPolynomial
+    InvalidPolynomial,
 }
 
 pub struct CrcConfig {
     reverse_in: CrcInputReverseConfig,
     reverse_out: bool,
+    #[cfg(crc_v3)]
     poly_size: PolySize,
     crc_init_value: u32,
+    #[cfg(crc_v3)]
     crc_poly: u32,
 }
 
@@ -28,16 +30,33 @@ pub enum CrcInputReverseConfig {
 }
 
 impl CrcConfig {
-    pub fn new(reverse_in: CrcInputReverseConfig, reverse_out: bool, poly_size: PolySize, crc_init_value: u32, crc_poly: u32) -> Result<Self, CrcConfigError> {
+    pub fn new(
+        reverse_in: CrcInputReverseConfig,
+        reverse_out: bool,
+        #[cfg(crc_v3)]
+        poly_size: PolySize,
+        crc_init_value: u32,
+        #[cfg(crc_v3)]
+        crc_poly: u32,
+    ) -> Result<Self, CrcConfigError> {
         // As Per RM0091 (DocID018940 Rev 9), Even polynomials are not supported.
+        #[cfg(crc_v3)]
         if crc_poly % 2 == 0 {
-            Err(CrcConfigError::InvalidPolynomial)
+            return Err(CrcConfigError::InvalidPolynomial);
-        } else {
-            Ok(CrcConfig { reverse_in, reverse_out, poly_size, crc_init_value, crc_poly })
         }
+        Ok(CrcConfig {
+            reverse_in,
+            reverse_out,
+            #[cfg(crc_v3)]
+            poly_size,
+            crc_init_value,
+            #[cfg(crc_v3)]
+            crc_poly,
+        })
     }
 }
 
+#[cfg(crc_v3)]
 pub enum PolySize {
     Width7,
     Width8,
@@ -47,7 +66,7 @@ pub enum PolySize {
 
 impl Crc {
     /// Instantiates the CRC32 peripheral and initializes it to default values.
-    pub fn new(peripheral: CRC, init_value: u32, config: CrcConfig) -> Self {
+    pub fn new(peripheral: CRC, config: CrcConfig) -> Self {
         // Note: enable and reset come from RccPeripheral.
         // enable CRC clock in RCC.
         CRC::enable();
@@ -57,53 +76,102 @@ impl Crc {
             _peripheral: peripheral,
             _config: config,
         };
-        unimplemented!();
+        CRC::reset();
-        // instance.init();
+        instance.reconfigure();
-        // instance
+        instance.reset();
+        instance
     }
 
-
-
     pub fn reset(&mut self) {
-        unsafe { PAC_CRC.cr().modify(|w| w.set_reset(true)); }
+        unsafe {
+            PAC_CRC.cr().modify(|w| w.set_reset(true));
+        }
     }
 
-
+    /// Reconfigures the CRC peripheral. Doesn't reset.
     fn reconfigure(&mut self) {
         unsafe {
             // Init CRC value
             PAC_CRC.init().write_value(self._config.crc_init_value);
+            #[cfg(crc_v3)]
+                PAC_CRC.pol().write_value(self._config.crc_poly);
 
+            // configure CR components
+            // (reverse I/O, polysize, poly)
             PAC_CRC.cr().modify(|w| {
                 // configure reverse output
-                w.set_rev_out(
+                w.set_rev_out(match self._config.reverse_out {
-                    match self._config.reverse_out {
+                    true => vals::RevOut::REVERSED,
-                        true => { vals::RevOut::REVERSED }
+                    false => vals::RevOut::NORMAL,
-                        false => { vals::RevOut::NORMAL }
+                });
-                    }
-                );
                 // configure reverse input
-                w.set_rev_in(
+                w.set_rev_in(match self._config.reverse_in {
-                    match self._config.reverse_in {
+                    CrcInputReverseConfig::None => vals::RevIn::NORMAL,
-                        CrcInputReverseConfig::None => { vals::RevIn::NORMAL }
+                    CrcInputReverseConfig::Byte => vals::RevIn::BYTE,
-                        CrcInputReverseConfig::Byte => { vals::RevIn::BYTE }
+                    CrcInputReverseConfig::Halfword => vals::RevIn::HALFWORD,
-                        CrcInputReverseConfig::Halfword => { vals::RevIn::HALFWORD }
+                    CrcInputReverseConfig::Word => vals::RevIn::WORD,
-                        CrcInputReverseConfig::Word => { vals::RevIn::WORD }
+                });
-                    }
-                );
                 // configure the polynomial.
-                w.set_polysize(
+                #[cfg(crc_v3)]
-                    match self._config.poly_size {
+                    w.set_polysize(match self._config.poly_size {
-                        PolySize::Width7 => { vals::Polysize::POLYSIZE7 }
+                    PolySize::Width7 => vals::Polysize::POLYSIZE7,
-                        PolySize::Width8 => { vals::Polysize::POLYSIZE8 }
+                    PolySize::Width8 => vals::Polysize::POLYSIZE8,
-                        PolySize::Width16 => { vals::Polysize::POLYSIZE16 }
+                    PolySize::Width16 => vals::Polysize::POLYSIZE16,
-                        PolySize::Width32 => { vals::Polysize::POLYSIZE32 }
+                    PolySize::Width32 => vals::Polysize::POLYSIZE32,
-                    }
+                });
-                )
-
             })
         }
 
         self.reset();
     }
+
+    /// Feeds a byte into the CRC peripheral. Returns the computed checksum.
+    pub fn feed_byte(&mut self, byte: u8) -> u32 {
+        unsafe {
+            PAC_CRC.dr8().write_value(byte as u32);
+            PAC_CRC.dr().read()
+        }
+    }
+
+    /// Feeds an slice of bytes into the CRC peripheral. Returns the computed checksum.
+    pub fn feed_bytes(&mut self, bytes: &[u8]) -> u32 {
+        for byte in bytes {
+            unsafe { PAC_CRC.dr8().write_value(*byte as u32); }
+        }
+        unsafe {
+            PAC_CRC.dr().read()
+        }
+    }
+    /// Feeds a halfword into the CRC peripheral. Returns the computed checksum.
+    pub fn feed_halfword(&mut self, byte: u16) -> u32 {
+        unsafe {
+            PAC_CRC.dr16().write_value(byte as u32);
+            PAC_CRC.dr().read()
+        }
+    }
+    /// Feeds an slice of halfwords into the CRC peripheral. Returns the computed checksum.
+    pub fn feed_halfwords(&mut self, bytes: &[u16]) -> u32 {
+        for byte in bytes {
+            unsafe { PAC_CRC.dr16().write_value(*byte as u32); }
+        }
+        unsafe {
+            PAC_CRC.dr().read()
+        }
+    }
+    /// Feeds a halfword into the CRC peripheral. Returns the computed checksum.
+    pub fn feed_word(&mut self, byte: u32) -> u32 {
+        unsafe {
+            PAC_CRC.dr().write_value(byte as u32);
+            PAC_CRC.dr().read()
+        }
+    }
+    /// Feeds an slice of halfwords into the CRC peripheral. Returns the computed checksum.
+    pub fn feed_words(&mut self, bytes: &[u32]) -> u32 {
+        for byte in bytes {
+            unsafe { PAC_CRC.dr().write_value(*byte as u32); }
+        }
+        unsafe {
+            PAC_CRC.dr().read()
+        }
+    }
 }

embassy-stm32/src/crc/v3.rs

@@ -1 +0,0 @@
-