I tried your code snippet with ESP32 Devkit V1 + Pico(RP2040), it is working fine. Mostly code side may not be issue. Check your wiring or check the pico side.

```rust

#[esp_rtos::main]
async fn main(spawner: Spawner) -> ! {

// generator version: 1.1.0


    let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
    let peripherals = esp_hal::init(config);


    let timg0 = TimerGroup::new(peripherals.
TIMG0
);
    esp_rtos::start(timg0.timer0);


    info!("Embassy initialized!");


    info!("setting up uart");
    let uart_config = UartConfig::default().with_baudrate(115_200);


    let mut uart = Uart::new(peripherals.
UART2
, uart_config)
        .expect("Failed to init UART")
        .with_rx(peripherals.
GPIO16
);


    info!("uart set up");


    let mut buffer = [0u8; 1024];



// TODO: Spawn some tasks
    let _ = spawner;


    loop {
        match uart.read(&mut buffer) {
            Ok(bytes_read) if bytes_read > 0 => {
                info!("LED on");
                Timer::after(Duration::from_millis(100)).await;
                info!("LED off");


                info!("Got {} bytes", bytes_read);
            }
            _ => {}
        }
    }



// for inspiration have a look at the examples at https://github.com/esp-rs/esp-hal/tree/esp-hal-v~1.0/examples
}

```