aboutsummaryrefslogtreecommitdiffstats
path: root/app/src/usb/pipe/ext_reg.rs
diff options
context:
space:
mode:
authorBrian Cully <bjc@kublai.com>2019-06-24 21:14:32 -0400
committerBrian Cully <bjc@kublai.com>2019-07-23 19:55:18 -0400
commit63d4ce8154eb8f6feb67986e98ea9b5007632460 (patch)
tree187e66104eb7c848dcf73a5ee067c5f27235360a /app/src/usb/pipe/ext_reg.rs
downloadsamd21-demo-63d4ce8154eb8f6feb67986e98ea9b5007632460.tar.gz
samd21-demo-63d4ce8154eb8f6feb67986e98ea9b5007632460.zip
Initial commit.
Diffstat (limited to 'app/src/usb/pipe/ext_reg.rs')
-rw-r--r--app/src/usb/pipe/ext_reg.rs156
1 files changed, 156 insertions, 0 deletions
diff --git a/app/src/usb/pipe/ext_reg.rs b/app/src/usb/pipe/ext_reg.rs
new file mode 100644
index 0000000..023ce9f
--- /dev/null
+++ b/app/src/usb/pipe/ext_reg.rs
@@ -0,0 +1,156 @@
+/// §32.8.7.4
+/// Extended Register.
+///
+/// Offset: 0x08
+/// Reset: 0xxxxxxxx
+/// Property: NA
+#[derive(Clone, Copy, Debug)]
+#[repr(C)]
+pub(crate) struct ExtReg(u16);
+
+pub(crate) struct R {
+ bits: u16,
+}
+
+pub(crate) struct W {
+ bits: u16,
+}
+
+impl ExtReg {
+ 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 ExtReg {
+ fn from(v: u16) -> Self {
+ Self(v)
+ }
+}
+
+impl R {
+ /// Value in raw bits.
+ pub fn bits(&self) -> u16 {
+ self.bits
+ }
+
+ pub fn variable(&self) -> VariableR {
+ let bits = {
+ const POS: u8 = 4;
+ const MASK: u16 = 0x7ff;
+ (self.bits >> POS) & MASK
+ };
+
+ VariableR(bits)
+ }
+
+ pub fn subpid(&self) -> SubPIDR {
+ let bits = {
+ const POS: u8 = 0;
+ const MASK: u16 = 0xf;
+ ((self.bits >> POS) & MASK) as u8
+ };
+
+ SubPIDR(bits)
+ }
+}
+
+/// Variable field send with extended token
+///
+/// These bits define the VARIABLE field sent with extended token. See
+/// “Section 2.1.1 Protocol Extension Token in the reference document
+/// ENGINEERING CHANGE NOTICE, USB 2.0 Link Power Management
+/// Addendum.”
+///
+/// To support the USB2.0 Link Power Management addition the VARIABLE
+/// field should be set as described below.
+///
+/// | VARIABLE | Description |
+/// +----------------+-----------------------+
+/// | VARIABLE[3:0] | bLinkState[1] |
+/// | VARIABLE[7:4] | BESL (See LPM ECN)[2] |
+/// | VARIABLE[8] | bRemoteWake[1] |
+/// | VARIABLE[10:9] | Reserved |
+///
+/// [1] for a definition of LPM Token bRemoteWake and bLinkState
+/// fields, refer to "Table 2-3 in the reference document ENGINEERING
+/// CHANGE NOTICE, USB 2.0 Link Power Management Addendum"
+///
+/// [2] for a definition of LPM Token BESL field, refer to "Table 2-3
+/// in the reference document ENGINEERING CHANGE NOTICE, USB 2.0 Link
+/// Power Management Addendum" and "Table X-X1 in Errata for ECN USB
+/// 2.0 Link Power Management.
+pub(crate) struct VariableR(u16);
+impl VariableR {
+ pub fn bits(&self) -> u16 {
+ self.0
+ }
+}
+
+/// SUBPID field with extended token
+///
+/// These bits define the SUBPID field sent with extended token. See
+/// “Section 2.1.1 Protocol Extension Token in the reference document
+/// ENGINEERING CHANGE NOTICE, USB 2.0 Link Power Management
+/// Addendum”.
+///
+/// To support the USB2.0 Link Power Management addition the SUBPID
+/// field should be set as described in “Table 2.2 SubPID Types in the
+/// reference document ENGINEERING CHANGE NOTICE, USB 2.0 Link Power
+/// Management Addendum”.
+pub(crate) struct SubPIDR(u8);
+impl SubPIDR {
+ pub fn bits(&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 variable(&mut self) -> VariableW {
+ VariableW { w: self }
+ }
+ pub fn subpid(&mut self) -> SubPIDW {
+ SubPIDW { w: self }
+ }
+}
+
+pub(crate) struct VariableW<'a> {
+ w: &'a mut W,
+}
+impl<'a> VariableW<'a> {
+ pub unsafe fn bits(self, v: u16) -> &'a mut W {
+ const POS: u8 = 4;
+ const MASK: u16 = 0x7ff;
+ self.w.bits &= !((MASK as u16) << POS);
+ self.w.bits |= ((v & MASK) as u16) << POS;
+ self.w
+ }
+}
+
+pub(crate) struct SubPIDW<'a> {
+ w: &'a mut W,
+}
+impl<'a> SubPIDW<'a> {
+ pub unsafe fn bits(self, v: u16) -> &'a mut W {
+ const POS: u8 = 0;
+ const MASK: u16 = 0xf;
+ self.w.bits &= !((MASK as u16) << POS);
+ self.w.bits |= ((v & MASK) as u16) << POS;
+ self.w
+ }
+}