Replace bytemuck with custom data conversion

embassy-stm32/Cargo.toml

@@ -86,8 +86,6 @@ document-features = "0.2.7"
 static_assertions = { version = "1.1" }
 volatile-register = { version = "0.2.1" }
 bitflags = "2.4.2"
-bytemuck = "1.7.3"
-
 
 [dev-dependencies]
 critical-section = { version = "1.1", features = ["std"] }

embassy-stm32/src/pka/mod.rs

@@ -676,23 +676,17 @@ impl<'d, T: Instance> Pka<'d, T> {
 
     /// Write to PKA RAM with offset
     fn write_to_ram(&mut self, offset: usize, data: &[u8]) {
-        match try_cast_slice(data) {
-            Ok(u32_data) => {
-                for (i, byte) in u32_data.iter().enumerate() {
-                    T::regs().ram(offset + i).write_value(*byte);
-                }
-
-                // Write 0 to next word
-                T::regs().ram(offset + u32_data.len()).write_value(0);
-            }
-            Err(_) => {
-                panic!(
-                    "Data is not aligned to u32. Data size: {}, data: {:x}",
-                    data.len(),
-                    data
-                );
-            }
+        let len = data.len() / 4;
+        let u32_data = data
+            .chunks_exact(4)
+            .map(|b| u32::from_le_bytes([b[0], b[1], b[2], b[3]]));
+
+        for (i, byte) in u32_data.enumerate() {
+            T::regs().ram(offset + i).write_value(byte);
         }
+
+        // Write 0 to next word
+        T::regs().ram(offset + len).write_value(0);
     }
 
     /// Write to PKA RAM with offset. Don't set the last word to 0