USB support

examples/usb/.gdbinit

@@ -0,0 +1,13 @@
+# disable "are you sure you want to quit?"
+define hook-quit
+    set confirm off
+end
+
+target remote :3333
+
+# print demangled symbols by default
+set print asm-demangle on
+
+monitor arm semihosting enable
+load
+cont

examples/usb/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "usb"
+version = "0.1.0"
+authors = ["Jonas Schievink <[email protected]>"]
+edition = "2018"
+
+[dependencies]
+cortex-m-rt = "0.6.12"
+panic-semihosting = "0.5.3"
+nrf52840-pac = "0.9.0"
+usb-device = "0.2.7"
+usbd-serial = "0.1.0"
+
+[dependencies.nrf52840-hal]
+version = "0.12.0"
+path = "../../nrf52840-hal"
+

examples/usb/Embed.toml

@@ -0,0 +1,63 @@
+[default.probe]
+# USB vendor ID
+# usb_vid = "1337"
+# USB product ID
+# usb_pid = "1337"
+# Serial number
+# serial = "12345678"
+# The protocol to be used for communicating with the target.
+protocol = "Swd"
+# The speed in kHz of the data link to the target.
+# speed = 1337
+
+[default.flashing]
+# Whether or not the target should be flashed.
+enabled = true
+# Whether or not the target should be halted after reset.
+# DEPRECATED, moved to reset section
+halt_afterwards = false
+# Whether or not bytes erased but not rewritten with data from the ELF
+# should be restored with their contents before erasing.
+restore_unwritten_bytes = false
+# The path where an SVG of the assembled flash layout should be written to.
+# flash_layout_output_path = "out.svg"
+
+[default.reset]
+# Whether or not the target should be reset.
+# When flashing is enabled as well, the target will be reset after flashing.
+enabled = true
+# Whether or not the target should be halted after reset.
+halt_afterwards = false
+
+[default.general]
+# The chip name of the chip to be debugged.
+chip = "nRF52840"
+# A list of chip descriptions to be loaded during runtime.
+chip_descriptions = []
+# The default log level to be used. Possible values are one of:
+#   "OFF", "ERROR", "WARN", "INFO", "DEBUG", "TRACE" 
+log_level = "WARN"
+
+[default.rtt]
+# Whether or not an RTTUI should be opened after flashing.
+# This is exclusive and cannot be used with GDB at the moment.
+enabled = true
+# A list of channel associations to be displayed. If left empty, all channels are displayed.
+channels = [
+    # { up = 0, down = 0, name = "name", format = "String" }
+]
+# The duration in ms for which the logger should retry to attach to RTT.
+timeout = 3000
+# Whether timestamps in the RTTUI are enabled
+show_timestamps = true
+# Whether to save rtt history buffer on exit.
+log_enabled = false
+# Where to save rtt history buffer relative to manifest path.
+log_path = "./logs"
+
+[default.gdb]
+# Whether or not a GDB server should be opened after flashing.
+# This is exclusive and cannot be used with RTT at the moment.
+enabled = false
+# The connection string in host:port format wher the GDB server will open a socket.
+# gdb_connection_string

examples/usb/README.md

@@ -0,0 +1,6 @@
+# USB examples
+
+This demo provides two binaries:
+
+- `serial`: a USB serial "echo" example.
+- `test_class`: exposes the test device from the `usb-device` crate.

examples/usb/src/bin/serial.rs

@@ -0,0 +1,59 @@
+#![no_std]
+#![no_main]
+
+use panic_semihosting as _;
+
+use cortex_m_rt::entry;
+use nrf52840_hal::clocks::Clocks;
+use nrf52840_hal::usbd::{UsbPeripheral, Usbd};
+use nrf52840_pac::Peripherals;
+use usb_device::device::{UsbDeviceBuilder, UsbVidPid};
+use usbd_serial::{SerialPort, USB_CLASS_CDC};
+
+#[entry]
+fn main() -> ! {
+    let periph = Peripherals::take().unwrap();
+    let clocks = Clocks::new(periph.CLOCK);
+    let clocks = clocks.enable_ext_hfosc();
+
+    let usb_bus = Usbd::new(UsbPeripheral::new(periph.USBD, &clocks));
+    let mut serial = SerialPort::new(&usb_bus);
+
+    let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x16c0, 0x27dd))
+        .manufacturer("Fake company")
+        .product("Serial port")
+        .serial_number("TEST")
+        .device_class(USB_CLASS_CDC)
+        .max_packet_size_0(64) // (makes control transfers 8x faster)
+        .build();
+
+    loop {
+        if !usb_dev.poll(&mut [&mut serial]) {
+            continue;
+        }
+
+        let mut buf = [0u8; 64];
+
+        match serial.read(&mut buf) {
+            Ok(count) if count > 0 => {
+                // Echo back in upper case
+                for c in buf[0..count].iter_mut() {
+                    if 0x61 <= *c && *c <= 0x7a {
+                        *c &= !0x20;
+                    }
+                }
+
+                let mut write_offset = 0;
+                while write_offset < count {
+                    match serial.write(&buf[write_offset..count]) {
+                        Ok(len) if len > 0 => {
+                            write_offset += len;
+                        }
+                        _ => {}
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+}

examples/usb/src/bin/test_class.rs

@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+
+use panic_semihosting as _;
+
+use cortex_m_rt::entry;
+use nrf52840_hal::clocks::Clocks;
+use nrf52840_hal::usbd::{UsbPeripheral, Usbd};
+use nrf52840_pac::Peripherals;
+use usb_device::test_class::TestClass;
+
+#[entry]
+fn main() -> ! {
+    let periph = Peripherals::take().unwrap();
+    let clocks = Clocks::new(periph.CLOCK);
+    let clocks = clocks.enable_ext_hfosc();
+
+    let usb_bus = Usbd::new(UsbPeripheral::new(periph.USBD, &clocks));
+
+    let mut test = TestClass::new(&usb_bus);
+
+    let mut usb_dev = { test.make_device(&usb_bus) };
+
+    loop {
+        if usb_dev.poll(&mut [&mut test]) {
+            test.poll();
+        }
+    }
+}

nrf-hal-common/Cargo.toml

@@ -63,6 +63,10 @@ version = "0.9.0"
 optional = true
 version = "0.2.1"
 
+[dependencies.nrf-usbd]
+version = "0.1.0"
+optional = true
+
 [dependencies.embedded-hal]
 features = ["unproven"]
 version = "0.2.4"
@@ -73,6 +77,6 @@ doc = []
 52810 = ["nrf52810-pac"]
 52811 = ["nrf52811-pac"]
 52832 = ["nrf52832-pac"]
-52833 = ["nrf52833-pac"]
-52840 = ["nrf52840-pac"]
+52833 = ["nrf52833-pac", "nrf-usbd"]
+52840 = ["nrf52840-pac", "nrf-usbd"]
 9160 = ["nrf9160-pac"]

nrf-hal-common/src/lib.rs

@@ -80,6 +80,8 @@ pub mod uart;
 pub mod uarte;
 #[cfg(not(feature = "9160"))]
 pub mod uicr;
+#[cfg(feature = "nrf-usbd")]
+pub mod usbd;
 pub mod wdt;
 
 pub mod prelude {

nrf-hal-common/src/usbd.rs

@@ -0,0 +1,21 @@
+use crate::clocks::ExternalOscillator;
+use crate::pac::USBD;
+use crate::Clocks;
+
+pub use nrf_usbd::Usbd;
+
+#[allow(dead_code)] // fields are unused and only hold ownership
+pub struct UsbPeripheral<'a> {
+    usbd: USBD,
+    clocks: &'a (),
+}
+
+impl<'a> UsbPeripheral<'a> {
+    pub fn new<L, LSTAT>(usbd: USBD, _clocks: &'a Clocks<ExternalOscillator, L, LSTAT>) -> Self {
+        Self { usbd, clocks: &() }
+    }
+}
+
+unsafe impl<'a> nrf_usbd::UsbPeripheral for UsbPeripheral<'a> {
+    const REGISTERS: *const () = USBD::ptr() as *const _;
+}

xtask/src/lib.rs

@@ -38,6 +38,7 @@ pub static EXAMPLES: &[(&str, &[&str])] = &[
     ("twim-demo", &[]),
     ("twis-demo", &[]),
     ("twis-dma-demo", &[]),
+    ("usb", &[]),
     ("wdt-demo", &[]),
 ];