Merge usb-mass-storage branch

kernel/src/usb.rs

@@ -0,0 +1,36 @@
+use crate::{scsi::MassStorageClass, storage::SdCard};
+use embassy_futures::select::select;
+use embassy_rp::{peripherals::USB, usb::Driver};
+use embassy_usb::{Builder, Config};
+
+pub async fn usb_handler(driver: Driver<'static, USB>, sdcard: SdCard) {
+    let mut config = Config::new(0xc0de, 0xcafe);
+    config.manufacturer = Some("LegitCamper");
+    config.product = Some("PicoCalc");
+    config.serial_number = Some("01001100");
+    config.max_power = 100;
+    config.max_packet_size_0 = 64;
+
+    let mut config_descriptor = [0; 256];
+    let mut bos_descriptor = [0; 64];
+    let mut control_buf = [0; 64];
+
+    let mut builder = Builder::new(
+        driver,
+        config,
+        &mut config_descriptor,
+        &mut bos_descriptor,
+        &mut [],
+        &mut control_buf,
+    );
+
+    let mut scsi = MassStorageClass::new(&mut builder, sdcard);
+    let mut usb = builder.build();
+
+    loop {
+        select(usb.run(), scsi.poll()).await;
+
+        defmt::warn!("rebuilding usb");
+        usb.disable().await;
+    }
+}