continue tc write impl

.idea/runConfigurations/Run_spacepackets.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Run" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
-    <option name="command" value="run --package launchpad --bin launchpad" />
+  <configuration default="false" name="Run spacepackets" type="CargoCommandRunConfiguration" factoryName="Cargo Command">
+    <option name="command" value="run --package spacepackets --bin spacepackets" />
     <option name="workingDirectory" value="file://$PROJECT_DIR$" />
     <option name="channel" value="DEFAULT" />
     <option name="requiredFeatures" value="true" />

spacepackets/src/ecss.rs

@@ -1,4 +1,22 @@
 use crate::CcsdsPacket;
+use crc::{Crc, CRC_16_IBM_3740};
+use serde::{Deserialize, Serialize};
+
+/// CRC algorithm used by the PUS standard
+pub const CRC_CCITT_FALSE: Crc<u16> = Crc::<u16>::new(&CRC_16_IBM_3740);
+
+/// All PUS versions. Only PUS C is supported by this library
+#[derive(PartialEq, Copy, Clone, Serialize, Deserialize, Debug)]
+pub enum PusVersion {
+    EsaPus = 0,
+    PusA = 1,
+    PusC = 2,
+}
+
+#[derive(Debug, Copy, Clone, PartialEq)]
+pub enum PusError {
+    VersionNotSupported(PusVersion),
+}
 
 pub trait PusPacket: CcsdsPacket {
     fn service(&self) -> u8;

spacepackets/src/lib.rs

@@ -235,8 +235,7 @@ pub trait CcsdsPrimaryHeader {
 
 pub mod srd {
     use crate::{
-        CcsdsPacket, CcsdsPrimaryHeader, PacketId, PacketSequenceCtrl, PacketType,
-        SequenceFlags,
+        CcsdsPacket, CcsdsPrimaryHeader, PacketId, PacketSequenceCtrl, PacketType, SequenceFlags,
     };
 
     /// Space Packet Primary Header according to CCSDS 133.0-B-2
@@ -331,9 +330,7 @@ pub mod srd {
 }
 
 pub mod zc {
-    use crate::{
-        CcsdsPacket, CcsdsPrimaryHeader, PacketId, PacketSequenceCtrl, VERSION_MASK,
-    };
+    use crate::{CcsdsPacket, CcsdsPrimaryHeader, PacketId, PacketSequenceCtrl, VERSION_MASK};
     use zerocopy::byteorder::NetworkEndian;
     use zerocopy::{AsBytes, FromBytes, Unaligned, U16};
 

spacepackets/src/main.rs

@@ -1,4 +1,4 @@
-use postcard::to_stdvec;
+use postcard::{from_bytes, to_stdvec};
 use serde::{Deserialize, Serialize};
 use zerocopy::byteorder::{I32, U16};
 use zerocopy::{AsBytes, FromBytes, NetworkEndian, Unaligned};
@@ -20,6 +20,13 @@ struct PostcardTest {
     some_float: f32,
 }
 
+#[derive(Serialize, Deserialize, Debug, PartialEq)]
+struct SliceSerTest<'slice> {
+    some_u8: u8,
+    some_u32: u32,
+    some_slice: &'slice [u8],
+}
+
 fn main() {
     let pc_test = PostcardTest {
         some_bool: true as u8,
@@ -40,4 +47,21 @@ fn main() {
     let mut slice = [0; 11];
     sample_hk.write_to(slice.as_mut_slice());
     println!("{:#04x?}", slice);
+
+    let ser_vec;
+    {
+        let test_buf = [0, 1, 2, 3];
+        let test_with_slice = SliceSerTest {
+            some_u8: 12,
+            some_u32: 1,
+            some_slice: test_buf.as_slice(),
+        };
+        ser_vec = to_stdvec(&test_with_slice).unwrap();
+        println!("{:#04x?}", out);
+    }
+
+    {
+        let test_deser: SliceSerTest = from_bytes(ser_vec.as_slice()).unwrap();
+        println!("{:?}", test_deser);
+    }
 }

spacepackets/src/tc.rs

@@ -1,17 +1,6 @@
-use crc::{Crc, CRC_16_IBM_3740};
-use serde::{Deserialize, Serialize};
-
-/// All PUS versions. Only PUS C is supported by this library
-#[derive(PartialEq, Copy, Clone, Serialize, Deserialize)]
-pub enum PusVersion {
-    EsaPus = 0,
-    PusA = 1,
-    PusC = 2,
-}
-
-pub const CRC_CCITT_FALSE: Crc<u16> = Crc::<u16>::new(&CRC_16_IBM_3740);
-
 pub mod zc {
+    use crate::ecss::{PusError, PusVersion};
+    use crate::tc::srd;
     use zerocopy::{AsBytes, FromBytes, NetworkEndian, Unaligned, U16};
 
     #[derive(FromBytes, AsBytes, Unaligned)]
@@ -22,12 +11,33 @@ pub mod zc {
         subservice: u8,
         source_id: U16<NetworkEndian>,
     }
+
+    impl TryFrom<srd::PusTcDataFieldHeader> for PusTcDataFieldHeader {
+        type Error = PusError;
+        fn try_from(value: srd::PusTcDataFieldHeader) -> Result<Self, Self::Error> {
+            if value.version != PusVersion::PusC {
+                return Err(PusError::VersionNotSupported(value.version));
+            }
+            Ok(PusTcDataFieldHeader {
+                version_ack: ((value.version as u8) << 4) | value.ack,
+                service: value.service,
+                subservice: value.subservice,
+                source_id: U16::from(value.source_id),
+            })
+        }
+    }
+
+    impl PusTcDataFieldHeader {
+        pub fn to_bytes(&self, slice: &mut (impl AsMut<[u8]> + ?Sized)) -> Option<()> {
+            self.write_to(slice.as_mut())
+        }
+    }
 }
 
 pub mod srd {
-    use crate::ecss::PusPacket;
+    use crate::ecss::{PusPacket, PusVersion, CRC_CCITT_FALSE};
     use crate::srd::SpHeader;
-    use crate::tc::{PusVersion, CRC_CCITT_FALSE};
+    use crate::tc::zc;
     use crate::{CcsdsPacket, PacketError, PacketId, PacketSequenceCtrl, PacketType};
     use serde::{Deserialize, Serialize};
 
@@ -56,6 +66,7 @@ pub mod srd {
     pub struct PusTc<'slice> {
         pub sph: SpHeader,
         pub data_field_header: PusTcDataFieldHeader,
+        #[serde(skip)]
         raw_data: Option<&'slice [u8]>,
         app_data: Option<&'slice [u8]>,
         crc16: Option<u16>,
@@ -78,15 +89,30 @@ pub mod srd {
             }
         }
 
-        pub fn write(&mut self, mut slice: impl AsMut<[u8]>) -> Result<(), PacketError> {
+        pub fn write(
+            &mut self,
+            slice: &mut (impl AsMut<[u8]> + ?Sized),
+        ) -> Result<(), PacketError> {
+            let mut_slice = slice.as_mut();
+            let mut curr_idx = 0;
             let sph_zc = crate::zc::SpHeader::from(self.sph);
-            if slice.as_mut().len() < 6 {
+            if mut_slice.len() < 6 {
                 return Err(PacketError::ToBytesSliceTooSmall(6));
             }
             sph_zc
-                .to_bytes(slice)
+                .to_bytes(&mut mut_slice[curr_idx..curr_idx + 6])
                 .ok_or(PacketError::ToBytesZeroCopyError)?;
-            // TODO: Finish impl
+            curr_idx += 6;
+            // The PUS version is hardcoded to PUS C
+            let pus_tc_header = zc::PusTcDataFieldHeader::try_from(self.data_field_header).unwrap();
+            let tc_header_len = std::mem::size_of::<PusTcDataFieldHeader>();
+            pus_tc_header
+                .to_bytes(&mut mut_slice[curr_idx..curr_idx + tc_header_len])
+                .ok_or(PacketError::ToBytesZeroCopyError)?;
+            curr_idx += tc_header_len;
+            if let Some(app_data) = self.app_data {
+                mut_slice[curr_idx..curr_idx + app_data.len()].copy_from_slice(app_data);
+            }
             Ok(())
         }
     }