timer works properly well

flake.nix

@@ -21,29 +21,37 @@
         gcc
         gnumake
         rustup
+        rust-analyzer
         cargo-espflash
         espup
 	mosquitto
       ];
 
 shellHook = ''
-  echo ">>> ESP32 DevShell (esp-hal only)"
+ echo ">>> ESP32 DevShell (esp-hal only)"
 
-  if [ ! -d "$HOME/.espup" ]; then
-    echo "Running espup install..."
-    espup install
-  fi
+ if [ ! -d "$HOME/.espup" ]; then
+   echo "Running espup install..."
+   espup install
+ fi
 
-  # Activate Xtensa Rust toolchain
-  export RUSTUP_TOOLCHAIN=esp
+  # Ensure the real rust-analyzer from Nix is used (not rustup's shim)
+  export PATH=${pkgs.rust-analyzer}/bin:$PATH
+
+  # Keep ESP toolchain binaries on PATH for building/flashing
+  # (do NOT set RUSTUP_TOOLCHAIN=esp globally; that breaks rust-analyzer)
   export PATH=$HOME/.rustup/toolchains/esp/bin:$PATH
+ 
+   # Add GCC/binutils path for xtensa-esp32-elf-gcc
+   export PATH=$HOME/.rustup/toolchains/esp/xtensa-esp-elf/esp-14.2.0_20240906/xtensa-esp-elf/bin:$PATH
+ 
+  # Helpers that force the ESP toolchain explicitly when needed
+  alias cargo-esp="RUSTUP_TOOLCHAIN=esp cargo"
+  alias rustc-esp="RUSTUP_TOOLCHAIN=esp rustc"
 
-  # Add GCC/binutils path for xtensa-esp32-elf-gcc
-  export PATH=$HOME/.rustup/toolchains/esp/xtensa-esp-elf/esp-14.2.0_20240906/xtensa-esp-elf/bin:$PATH
-
-  echo "Xtensa Rust toolchain ready."
-  rustc --version
-  which xtensa-esp32-elf-gcc || echo "⚠️ xtensa-esp32-elf-gcc not found in PATH"
+   echo "Xtensa Rust toolchain ready."
+   rustc --version
+   which xtensa-esp32-elf-gcc || echo "⚠️ xtensa-esp32-elf-gcc not found in PATH"
 '';
     };
   };

test_LED3_interrupt/Makefile

@@ -7,3 +7,6 @@ build:
 
 flash:
 	cargo espflash flash --release --monitor
+
+clean:
+	cargo espflash erase-flash

test_LED3_interrupt/src/bin/main.rs

@@ -6,11 +6,15 @@
     holding buffers for the duration of a data transfer."
 )]
 use embassy_executor::Spawner;
-use embassy_time::{Duration, Timer};
+// use embassy_time::{Duration, Timer};
 use esp_backtrace as _;
-use esp_hal::gpio::{Output, Level, OutputConfig};
-use esp_hal::clock::CpuClock;
-use esp_hal::timer::timg::TimerGroup;
+use esp_hal::{
+    clock::CpuClock,
+    gpio::{Level, Output, OutputConfig},
+    timer::Timer,
+    timer::timg::TimerGroup,
+    time::Duration,
+};
 use log::info;
 
 extern crate alloc;
@@ -28,8 +32,8 @@ async fn main(spawner: Spawner) {
     
     esp_alloc::heap_allocator!(size: 64 * 1024);
     
-    let timer0 = TimerGroup::new(peripherals.TIMG1);
-    esp_hal_embassy::init(timer0.timer0);
+    let timer_group1 = TimerGroup::new(peripherals.TIMG1);
+    let timer0 = timer_group1.timer0;
 
     // Initialize GPIO4 as output (starts LOW)
     let mut gpio4 = Output::new(peripherals.GPIO4, Level::Low, OutputConfig::default());
@@ -38,12 +42,25 @@ async fn main(spawner: Spawner) {
     loop {
         gpio4.set_high();
         info!("GPIO4 ON");
-        Timer::after(Duration::from_secs(1)).await;
+
+        // Start timer for 1 second and block until done
+        let duration = Duration::from_secs(1);
+        timer0.load_value(duration).unwrap();
+        timer0.start();
+        info!("{:?}", duration);
+
+        // Wait until timer completes
+        while !timer0.is_interrupt_set() {}
+        timer0.clear_interrupt();
 
         gpio4.set_low();
         info!("GPIO4 OFF");
-        Timer::after(Duration::from_secs(1)).await;
+
+        // Start timer for 1 second and block until done
+        timer0.load_value(duration).unwrap();
+        timer0.start();
+
+        while !timer0.is_interrupt_set() {}
+        timer0.clear_interrupt();
     }
-    
-    // for inspiration have a look at the examples at https://github.com/esp-rs/esp-hal/tree/esp-hal-v1.0.0-rc.0/examples/src/bin
 }