Migrate everything over to separate libraries.

  * `usb-host` is the crate containing the HAL traits.

  * `bootkbd` is a crate for a bare-bones boot protocol keyboard
    driver.

  * `samd21-host` is a crate with an implementation of `usb-host` for
    a SAMD21 platform, with an example for the trinket-m0 which uses
    the `bootkbd` driver to print keyboard reports.

1 files changed, 177 insertions, 0 deletions

diff --git a/samd21-host/src/pipe/ctrl_pipe.rs b/samd21-host/src/pipe/ctrl_pipe.rs
new file mode 100644
index 0000000..9301d51
--- /dev/null
+++ b/samd21-host/src/pipe/ctrl_pipe.rs
@@ -0,0 +1,177 @@
+/// Host Control Pipe.
+///
+/// Offset: 0x0c
+/// Reset: 0xXXXX
+/// Property: PAC Write-Protection, Write-Synchronized, Read-Synchronized
+#[derive(Clone, Copy, Debug)]
+#[repr(C, packed)]
+pub struct CtrlPipe(u16);
+
+pub struct R {
+    bits: u16,
+}
+
+pub struct W {
+    bits: u16,
+}
+
+impl CtrlPipe {
+    pub fn read(&self) -> R {
+        R { bits: self.0 }
+    }
+
+    pub fn write<F>(&mut self, f: F)
+    where
+        F: FnOnce(&mut W) -> &mut W,
+    {
+        let mut w = W { bits: self.0 };
+        f(&mut w);
+        self.0 = w.bits;
+    }
+}
+
+impl From<u16> for CtrlPipe {
+    fn from(v: u16) -> Self {
+        Self(v)
+    }
+}
+
+impl R {
+    /// Value in raw bits.
+    pub fn bits(&self) -> u16 {
+        self.bits
+    }
+
+    pub fn permax(&self) -> PErMaxR {
+        let bits = {
+            const POS: u8 = 12;
+            const MASK: u16 = 0xf;
+            ((self.bits >> POS) & MASK) as u8
+        };
+
+        PErMaxR(bits)
+    }
+
+    pub fn pepnum(&self) -> PEpNumR {
+        let bits = {
+            const POS: u8 = 8;
+            const MASK: u16 = 0xf;
+            ((self.bits >> POS) & MASK) as u8
+        };
+
+        PEpNumR(bits)
+    }
+
+    pub fn pdaddr(&self) -> PDAddrR {
+        let bits = {
+            const POS: u8 = 0;
+            const MASK: u16 = 0x3f;
+            ((self.bits >> POS) & MASK) as u8
+        };
+
+        PDAddrR(bits)
+    }
+}
+
+/// Pipe Error Max Number
+///
+/// These bits define the maximum number of error for this Pipe before
+/// freezing the pipe automatically.
+pub struct PErMaxR(u8);
+impl PErMaxR {
+    pub fn max(&self) -> u8 {
+        self.0
+    }
+}
+
+/// Pipe EndPoint Number
+///
+/// These bits define the number of endpoint for this Pipe.
+pub struct PEpNumR(u8);
+impl PEpNumR {
+    pub fn epnum(&self) -> u8 {
+        self.0
+    }
+}
+
+/// Pipe Device Address
+///
+/// These bits define the Device Address for this pipe.
+pub struct PDAddrR(u8);
+impl PDAddrR {
+    pub fn addr(&self) -> u8 {
+        self.0
+    }
+}
+
+impl W {
+    /// Write raw bits.
+
+    pub unsafe fn bits(&mut self, v: u16) -> &mut Self {
+        self.bits = v;
+        self
+    }
+
+    pub fn permax(&mut self) -> PErMaxW {
+        PErMaxW { w: self }
+    }
+
+    pub fn pepnum(&mut self) -> PEpNumW {
+        PEpNumW { w: self }
+    }
+
+    pub fn pdaddr(&mut self) -> PDAddrW {
+        PDAddrW { w: self }
+    }
+}
+
+pub struct PErMaxW<'a> {
+    w: &'a mut W,
+}
+impl<'a> PErMaxW<'a> {
+    pub unsafe fn bits(self, v: u8) -> &'a mut W {
+        const POS: u8 = 12;
+        const MASK: u8 = 0xf;
+        self.w.bits &= !((MASK as u16) << POS);
+        self.w.bits |= ((v & MASK) as u16) << POS;
+        self.w
+    }
+
+    pub fn set_max(self, v: u8) -> &'a mut W {
+        unsafe { self.bits(v) }
+    }
+}
+
+pub struct PEpNumW<'a> {
+    w: &'a mut W,
+}
+impl<'a> PEpNumW<'a> {
+    pub unsafe fn bits(self, v: u8) -> &'a mut W {
+        const POS: u8 = 8;
+        const MASK: u8 = 0xf;
+        self.w.bits &= !((MASK as u16) << POS);
+        self.w.bits |= ((v & MASK) as u16) << POS;
+        self.w
+    }
+
+    pub fn set_epnum(self, v: u8) -> &'a mut W {
+        unsafe { self.bits(v) }
+    }
+}
+
+pub struct PDAddrW<'a> {
+    w: &'a mut W,
+}
+impl<'a> PDAddrW<'a> {
+    pub unsafe fn bits(self, v: u8) -> &'a mut W {
+        const POS: u8 = 0;
+        const MASK: u8 = 0x3f;
+        self.w.bits &= !((MASK as u16) << POS);
+        self.w.bits |= ((v & MASK) as u16) << POS;
+        self.w
+    }
+
+    pub fn set_addr(self, v: u8) -> &'a mut W {
+        unsafe { self.bits(v) }
+    }
+}