add wifi scan example

examples/rpi-pico-w/src/bin/tcp_server.rs

@@ -48,9 +48,8 @@ async fn main(spawner: Spawner) {
 
     let p = embassy_rp::init(Default::default());
 
-    // Include the WiFi firmware and Country Locale Matrix (CLM) blobs.
-    let fw = include_bytes!("../../../firmware/43439A0.bin");
-    let clm = include_bytes!("../../../firmware/43439A0_clm.bin");
+    let fw = include_bytes!("../../../../firmware/43439A0.bin");
+    let clm = include_bytes!("../../../../firmware/43439A0_clm.bin");
 
     // To make flashing faster for development, you may want to flash the firmwares independently
     // at hardcoded addresses, instead of baking them into the program with `include_bytes!`:

examples/rpi-pico-w/src/bin/wifi_scan.rs

@@ -0,0 +1,81 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+#![feature(async_fn_in_trait)]
+#![allow(incomplete_features)]
+
+use core::str;
+
+use cyw43_pio::PioSpi;
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_net::Stack;
+use embassy_rp::gpio::{Level, Output};
+use embassy_rp::peripherals::{DMA_CH0, PIN_23, PIN_25};
+use embassy_rp::pio::{Pio0, PioPeripheral, PioStateMachineInstance, Sm0};
+use static_cell::StaticCell;
+use {defmt_rtt as _, panic_probe as _};
+
+macro_rules! singleton {
+    ($val:expr) => {{
+        type T = impl Sized;
+        static STATIC_CELL: StaticCell<T> = StaticCell::new();
+        STATIC_CELL.init_with(move || $val)
+    }};
+}
+
+#[embassy_executor::task]
+async fn wifi_task(
+    runner: cyw43::Runner<
+        'static,
+        Output<'static, PIN_23>,
+        PioSpi<PIN_25, PioStateMachineInstance<Pio0, Sm0>, DMA_CH0>,
+    >,
+) -> ! {
+    runner.run().await
+}
+
+#[embassy_executor::task]
+async fn net_task(stack: &'static Stack<cyw43::NetDriver<'static>>) -> ! {
+    stack.run().await
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    info!("Hello World!");
+
+    let p = embassy_rp::init(Default::default());
+
+    let fw = include_bytes!("../../../../firmware/43439A0.bin");
+    let clm = include_bytes!("../../../../firmware/43439A0_clm.bin");
+
+    // To make flashing faster for development, you may want to flash the firmwares independently
+    // at hardcoded addresses, instead of baking them into the program with `include_bytes!`:
+    //     probe-rs-cli download 43439A0.bin --format bin --chip RP2040 --base-address 0x10100000
+    //     probe-rs-cli download 43439A0_clm.bin --format bin --chip RP2040 --base-address 0x10140000
+    //let fw = unsafe { core::slice::from_raw_parts(0x10100000 as *const u8, 224190) };
+    //let clm = unsafe { core::slice::from_raw_parts(0x10140000 as *const u8, 4752) };
+
+    let pwr = Output::new(p.PIN_23, Level::Low);
+    let cs = Output::new(p.PIN_25, Level::High);
+
+    let (_, sm, _, _, _) = p.PIO0.split();
+    let dma = p.DMA_CH0;
+    let spi = PioSpi::new(sm, cs, p.PIN_24, p.PIN_29, dma);
+
+    let state = singleton!(cyw43::State::new());
+    let (_net_device, mut control, runner) = cyw43::new(state, pwr, spi, fw).await;
+    unwrap!(spawner.spawn(wifi_task(runner)));
+
+    control.init(clm).await;
+    control
+        .set_power_management(cyw43::PowerManagementMode::PowerSave)
+        .await;
+
+    let mut scanner = control.scan().await;
+    while let Some(bss) = scanner.next().await {
+        if let Ok(ssid_str) = str::from_utf8(&bss.ssid) {
+            info!("scanned {} == {:x}", ssid_str, bss.bssid);
+        }
+    }
+}