new models library

embedded-examples/models/Cargo.toml

@@ -4,5 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-serde = "1"
+serde = { version = "1", default-features = false }
 defmt = { version = "1", optional = true }
+spacepackets = { version = "0.17", default-features = false, features = ["defmt", "serde"] }
+postcard = { version = "1", features = ["defmt"] }

embedded-examples/models/src/lib.rs

@@ -2,6 +2,11 @@
 
 use core::time::Duration;
 
+use spacepackets::{
+    CcsdsPacketCreationError, CcsdsPacketCreatorWithReservedData, CcsdsPacketIdAndPsc,
+    SpacePacketHeader, ccsds_packet_len_for_user_data_len_with_checksum,
+};
+
 #[derive(Copy, Clone, Debug, serde::Serialize, serde::Deserialize)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Request {
@@ -15,5 +20,37 @@ pub enum Response {
     CommandDone,
 }
 
+#[derive(Debug, serde::Serialize, serde::Deserialize)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub struct TmHeader {
+    pub tc_packet_id: Option<CcsdsPacketIdAndPsc>,
+    pub uptime_millis: u32,
+}
+
+pub fn tm_size(tm_header: &TmHeader, response: &Response) -> usize {
+    ccsds_packet_len_for_user_data_len_with_checksum(
+        postcard::experimental::serialized_size(tm_header).unwrap()
+            + postcard::experimental::serialized_size(response).unwrap(),
+    )
+    .unwrap()
+}
+
+pub fn create_tm_packet(
+    buf: &mut [u8],
+    sp_header: SpacePacketHeader,
+    tm_header: TmHeader,
+    response: Response,
+) -> Result<usize, CcsdsPacketCreationError> {
+    let packet_data_size = postcard::experimental::serialized_size(&tm_header).unwrap()
+        + postcard::experimental::serialized_size(&response).unwrap();
+    let mut creator =
+        CcsdsPacketCreatorWithReservedData::new_tm_with_checksum(sp_header, packet_data_size, buf)?;
+
+    let current_index = postcard::to_slice(&tm_header, creator.packet_data_mut())
+        .unwrap()
+        .len();
+    postcard::to_slice(&response, &mut creator.packet_data_mut()[current_index..]).unwrap();
+    Ok(creator.finish())
+}
 #[cfg(test)]
 mod tests {}