Adding WIP livestreaming implementation

src/bin/dual-iir.rs

@@ -128,7 +128,7 @@ const APP: () = {
     ///
     /// Because the ADC and DAC operate at the same rate, these two constraints actually implement
     /// the same time bounds, meeting one also means the other is also met.
-    #[task(binds=DMA1_STR4, spawn=[stream], resources=[adcs, digital_inputs, dacs, iir_state, settings, telemetry, generator], priority=3)]
+    #[task(binds=DMA1_STR4, resources=[adcs, digital_inputs, dacs, iir_state, settings, telemetry, generator], priority=2)]
     fn process(c: process::Context) {
         let adc_samples = [
             c.resources.adcs.0.acquire_buffer(),
@@ -177,15 +177,6 @@ const APP: () = {
             [DacCode(dac_samples[0][0]), DacCode(dac_samples[1][0])];
 
         c.resources.telemetry.digital_inputs = digital_inputs;
-
-        // Make a best effort to start data stream processing. It may be blocked by someone else
-        // using the network stack.
-        c.spawn.stream().ok();
-    }
-
-    #[task(priority = 2, resources=[network])]
-    fn stream(c: stream::Context) {
-        c.resources.network.update_stream()
     }
 
     #[idle(resources=[network], spawn=[settings_update])]
@@ -196,7 +187,7 @@ const APP: () = {
                     c.spawn.settings_update().unwrap()
                 }
                 NetworkState::Updated => {}
-                NetworkState::NoChange => cortex_m::asm::wfi(),
+                NetworkState::NoChange => {},
             }
         }
     }
@@ -204,8 +195,8 @@ const APP: () = {
     #[task(priority = 1, resources=[network, afes, settings])]
     fn settings_update(mut c: settings_update::Context) {
         // Update the IIR channels.
-        let settings = c.resources.network.lock(|net| net.miniconf.settings());
-        c.resources.settings.lock(|current| *current = settings);
+        let settings = c.resources.network.miniconf.settings();
+        c.resources.settings.lock(|current| *current = *settings);
 
         // Update AFEs
         c.resources.afes.0.set_gain(settings.afe[0]);
@@ -222,8 +213,8 @@ const APP: () = {
             .settings
             .lock(|settings| (settings.afe, settings.telemetry_period));
 
-        c.resources.network.lock(|net| net.telemetry
-            .publish(&telemetry.finalize(gains[0], gains[1])));
+        c.resources.network.telemetry
+            .publish(&telemetry.finalize(gains[0], gains[1]));
 
         // Schedule the telemetry task in the future.
         c.schedule
@@ -239,22 +230,22 @@ const APP: () = {
         unsafe { stm32h7xx_hal::ethernet::interrupt_handler() }
     }
 
-    #[task(binds = SPI2, priority = 4)]
+    #[task(binds = SPI2, priority = 3)]
     fn spi2(_: spi2::Context) {
         panic!("ADC0 input overrun");
     }
 
-    #[task(binds = SPI3, priority = 4)]
+    #[task(binds = SPI3, priority = 3)]
     fn spi3(_: spi3::Context) {
         panic!("ADC1 input overrun");
     }
 
-    #[task(binds = SPI4, priority = 4)]
+    #[task(binds = SPI4, priority = 3)]
     fn spi4(_: spi4::Context) {
         panic!("DAC0 output error");
     }
 
-    #[task(binds = SPI5, priority = 4)]
+    #[task(binds = SPI5, priority = 3)]
     fn spi5(_: spi5::Context) {
         panic!("DAC1 output error");
     }

src/net/data_stream.rs

@@ -25,6 +25,7 @@ pub fn setup_streaming(
     (generator, stream)
 }
 
+#[derive(Debug)]
 pub struct AdcDacData {
     block_id: u32,
     adcs: [[u16; SAMPLE_BUFFER_SIZE]; 2],
@@ -57,8 +58,9 @@ impl BlockGenerator {
 
         self.current_id = self.current_id.wrapping_add(1);
 
-        // We perform best-effort enqueueing of the data block.
-        self.queue.enqueue(block).ok();
+        // Note(unwrap): The buffering of the queue and processing of blocks must be fast enough
+        // such that blocks will never be silently dropped.
+        self.queue.enqueue(block).unwrap();
     }
 }
 
@@ -173,6 +175,11 @@ impl DataStream {
         if self.socket.is_none() && self.remote.is_some() {
             // If we still can't open the remote, continue.
             if self.open(self.remote.unwrap()).is_err() {
+
+                // Clear the queue out.
+                while self.queue.ready() {
+                    self.queue.dequeue();
+                }
                 return false;
             }
         }
@@ -188,6 +195,9 @@ impl DataStream {
         // TODO: Clean up magic numbers.
         if capacity < 72 {
             // We cannot send a full data block. Abort now.
+            while self.queue.ready() {
+                self.queue.dequeue();
+            }
             return false;
         }
 

src/net/miniconf_client.rs

@@ -156,7 +156,7 @@ where
     }
 
     /// Get the current settings from miniconf.
-    pub fn settings(&self) -> S {
-        self.settings.clone()
+    pub fn settings(&self) -> &S {
+        &self.settings
     }
 }

src/net/mod.rs

@@ -124,41 +124,34 @@ where
         }
     }
 
-    pub fn update_stream(&mut self) {
-        // Update the data stream.
-        if self.generator.is_none() {
-            loop {
-                // Process egress of the stack.
-                self.processor.egress();
-
-                if !self.stream.process() {
-                    return
-                }
-            }
-        }
-    }
-
     /// Update and process all of the network users state.
     ///
     /// # Returns
     /// An indication if any of the network users indicated a state change.
     pub fn update(&mut self) -> NetworkState {
+        super::debug::high();
+        // Update the MQTT clients.
+        self.telemetry.update();
+
+        // Update the data stream.
+        if self.generator.is_none() {
+            while self.stream.process() {}
+        }
+
         // Poll for incoming data.
         let poll_result = match self.processor.update() {
             UpdateState::NoChange => NetworkState::NoChange,
             UpdateState::Updated => NetworkState::Updated,
         };
 
-        // Update the MQTT clients.
-        self.telemetry.update();
-
-        // Update the data stream.
-        self.update_stream();
-
-        match self.miniconf.update() {
+        let result = match self.miniconf.update() {
             UpdateState::Updated => NetworkState::SettingsChanged,
             UpdateState::NoChange => poll_result,
-        }
+        };
+
+        super::debug::low();
+
+        result
     }
 }
 

src/net/network_processor.rs

@@ -65,17 +65,19 @@ impl NetworkProcessor {
 
         // If the PHY indicates there's no more ethernet link, reset the DHCP server in the network
         // stack.
-        match self.phy.poll_link() {
-            true => self.network_was_reset = false,
+        // TODO: Poll the link state in a task and handle resets. Polling this often is slow and
+        // uses necessary CPU time.
+        //match self.phy.poll_link() {
+        //    true => self.network_was_reset = false,
 
-            // Only reset the network stack once per link reconnection. This prevents us from
-            // sending an excessive number of DHCP requests.
-            false if !self.network_was_reset => {
-                self.network_was_reset = true;
-                self.stack.lock(|stack| stack.handle_link_reset());
-            }
-            _ => {}
-        };
+        //    // Only reset the network stack once per link reconnection. This prevents us from
+        //    // sending an excessive number of DHCP requests.
+        //    false if !self.network_was_reset => {
+        //        self.network_was_reset = true;
+        //        self.stack.lock(|stack| stack.handle_link_reset());
+        //    }
+        //    _ => {}
+        //};
 
         result
     }