just use 32 bit

cangen/README.md

@@ -13,6 +13,7 @@ Ex. If there are 5 messages of size one (booleans), add a 3 bit filler before ad
 4. Message totals should be byte aligned, meaning total bit size of a message should be a power of 8
 5. **Signed messages must be 8,16,or 32 bits!**
 6. **Little endian messages must be 8,16, or 32 bits!**
+7. Maximum size of a sent message (default, aka send=True), is 32 bits
 
 Message guide:
 1. Use previous examples for most things

cangen/RustSynth.py

@@ -143,16 +143,14 @@ def parse_decoders(self, field: CANPoint, skip) -> str:
 		if skip:
 			return f"reader.skip({field.size}).unwrap()"
 
-		size = field.size
-		if field.size < 8:
-			size = 8
-
 		if field.endianness == "big":
 			if field.signed:
-				base = f"reader.read_signed::<i{size}>({field.size}).unwrap()"
+				# doesnt need exact sign bit as it is in big endian form, the form of the native stream
+				base = f"reader.read_signed::<i32>({field.size}).unwrap()"
 			else:
-				base = f"reader.read::<u{size}>({field.size}).unwrap()"
+				base = f"reader.read::<u32>({field.size}).unwrap()"
 		elif field.endianness == "little":
+			# use the read_as_to, which requires byte sized data to get the correct sign bit
 			if field.signed:
 				base = f"reader.read_as_to::<LittleEndian, i{field.size}>().unwrap()"
 			else: