starnote spectrum

sfy-buoy/Cargo.toml

@@ -45,14 +45,15 @@ git = "https://github.com/gauteh/notecard-rs"
 half = { version = "2.4", features = [ "use-intrinsics", "bytemuck", "serde" ] }
 
 [features]
-default = [ "build-bin" ]
+default = [ "build-bin", "ext-gps", "spectrum" ]
 continuous = []
 continuous-post = [ "continuous", "dep:ufmt" ]
 20Hz = ["fir"]
 raw = [ "storage" ]
 fir = []
 storage = []
 ext-gps = [ "dep:serde-json-core"]
+spectrum = []
 surf = []
 ice = []
 target-test = [ "storage" ]

sfy-buoy/sfy-artemis/Cargo.toml

@@ -45,4 +45,5 @@ surf = [ "sfy/surf" ]
 ice = [ "sfy/ice" ]
 deploy = []
 defmt-serial = [ "dep:ufmt", "dep:defmt-serial" ]
+spectrum = [ "sfy/spectrum" ]
 

sfy-buoy/src/lib.rs

@@ -43,6 +43,9 @@ pub mod waves;
 #[cfg(feature = "ext-gps")]
 pub mod gps;
 
+#[cfg(feature = "spectrum")]
+pub mod welch;
+
 use axl::AxlPacket;
 #[cfg(feature = "storage")]
 use storage::Storage;

sfy-buoy/src/note.rs

@@ -284,6 +284,44 @@ impl<I2C: Read + Write> Notecarrier<I2C> {
                 .wait(delay)?;
         }
 
+        #[cfg(feature = "spectrum")]
+        {
+            defmt::debug!("setting up spectrum templates..");
+
+            #[derive(serde::Serialize, Default)]
+            struct SpectrumMetaTemplate {
+                timestamp: u32,
+
+                _ltime: u32,
+                _lon: f32,
+                _lat: f32,
+
+                length: u32,
+            }
+
+            let meta_template = SpectrumMetaTemplate {
+                timestamp: 18,
+
+                _ltime: 14,
+                _lon: 14.1,
+                _lat: 14.1,
+
+                length: 14,
+            };
+
+            defmt::debug!("setting up template for spectrum");
+            self.note()
+                .template(
+                    delay,
+                    Some("spec.qo"),
+                    Some(meta_template),
+                    Some(crate::welch::WELCH_OUTN as u32),
+                    notecard::template::Compact, // sync over starnote/lora as well
+                    Some(10), // starnote/lora port
+                )?
+                .wait(delay)?;
+        }
+
         Ok(())
     }
 

sfy-buoy/src/welch.rs

@@ -0,0 +1,19 @@
+use heapless::Vec;
+
+pub const NFFT: usize = 4096;
+pub const NSEG: usize = 4096;
+pub const NOVERLAP: usize = NSEG / 2;
+
+// Cut-off frequencies for spectrum.
+pub const f0: f32 = 0.01;   // Hz
+pub const f1: f32 = 5.0;      // Hz
+
+pub const WELCH_PACKET_SZ: usize = 124;
+
+/// Maximum length of base64 string
+pub const WELCH_OUTN: usize = { 6 * WELCH_PACKET_SZ * 2 } * 4 / 3 + 4;
+
+pub struct Welch {
+    buf: Vec<f64, NSEG>,
+    spec: Vec<f64, NFFT>,
+}