Included LED RPC.

src/communication.rs

@@ -17,7 +17,7 @@ use postcard_rpc::{
     },
 };
 
-use bioz_icd_rs::{PingEndpoint, GetUniqueIdEndpoint, ENDPOINT_LIST, TOPICS_IN_LIST, TOPICS_OUT_LIST};
+use bioz_icd_rs::{PingEndpoint, GetUniqueIdEndpoint, SetGreenLedEndpoint, ENDPOINT_LIST, TOPICS_IN_LIST, TOPICS_OUT_LIST};
 
 pub struct Context {
     pub unique_id: [u8; 12],
@@ -48,6 +48,7 @@ define_dispatch! {
         | ----------                | ----      | -------                       |
         | PingEndpoint              | blocking  | ping_handler                  |
         | GetUniqueIdEndpoint       | blocking  | get_unique_id_handler         |
+        | SetGreenLedEndpoint       | async     | set_green_led_handler         |
     };
     topics_in: {
         list: TOPICS_IN_LIST;
@@ -125,3 +126,14 @@ fn get_unique_id_handler(context: &mut Context, _header: VarHeader, _rqst: ()) -
     info!("get_unique_id");
     context.unique_id
 }
+
+use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
+use embassy_sync::signal::Signal;
+
+pub static LED_FREQUENCY_SIGNAL: Signal<CriticalSectionRawMutex, f32> = Signal::new();
+
+async fn set_green_led_handler(_context: &mut Context, _header: VarHeader, rqst: f32) {
+    info!("Set green led frequency to {:?} Hz", rqst);
+    
+    LED_FREQUENCY_SIGNAL.signal(rqst);
+}

src/main.rs

@@ -3,10 +3,12 @@
 
 use defmt::info;
 use embassy_executor::Spawner;
+use embassy_time::{Timer, Duration};
+use embassy_futures::{select::select, select::Either};
 use embassy_stm32::gpio::{Level, Output, Speed};
 use embassy_stm32::{i2c, spi, Config};
 use embassy_stm32::time::Hertz;
-use embassy_time::Timer;
+
 use crate::ad5940_registers::{AFECON, AFEGENINTSTA};
 
 use {defmt_rtt as _, panic_probe as _};
@@ -26,7 +28,7 @@ use embassy_stm32::usb::Driver;
 use embassy_stm32::{bind_interrupts, peripherals, usb};
 
 mod communication;
-use communication::init_communication;
+use communication::{init_communication, LED_FREQUENCY_SIGNAL};
 
 bind_interrupts!(struct Irqs {
     USB_DRD_FS => usb::InterruptHandler<peripherals::USB>;
@@ -122,6 +124,9 @@ async fn main(spawner: Spawner) {
     let driver = Driver::new(p.USB, Irqs, p.PA12, p.PA11);
     init_communication(driver, spawner);
 
+    // Green led task
+    spawner.must_spawn(green_led(led));
+
     loop {
         // Read chip id
         // let chip_id = ad5940.get_chipid().await.unwrap();
@@ -135,16 +140,38 @@ async fn main(spawner: Spawner) {
         // info!("Electrodes states: {:?}", result);        
 
         // info!("high");
-        led.set_high();
 
-        Timer::after_millis(1000).await;
         
-        led.set_low();
 
-        Timer::after_millis(1000).await;
 
-        info!("Toggle!");
+
+        info!("Mainloop still running!");
+
+        Timer::after_millis(5000).await;
 
         // ad5940.sequencer_trigger().await;        
     }
 }
+
+#[embassy_executor::task]
+async fn green_led(mut led: Output<'static>) {
+    let mut delay = Duration::from_millis(500);
+
+    loop {
+        // Wait for either a frequency change or a timer timeout
+        match select(LED_FREQUENCY_SIGNAL.wait(), Timer::after(delay)).await {
+            Either::First(frequency) => {
+                if frequency > 0.0 {
+                    // Avoid divide-by-zero or negative delay
+                    let millis = (1000.0 / frequency) as u64 / 2;
+                    delay = Duration::from_millis(millis.max(1)); // enforce minimum delay of 1ms
+                }
+            }
+            Either::Second(_) => {
+                // Timer expired, proceed to toggle
+            }
+        }
+
+        led.toggle();
+    }
+}