From e832ef6cc3a14701b176450f9406f5d6ff7ae321 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Sun, 28 Jul 2019 09:38:10 -0400
Subject: Remove delay field from USBHost.

It was being used for FSM timings, so put it directly on the state
discriminant if required.
---
 usbh/src/lib.rs | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/usbh/src/lib.rs b/usbh/src/lib.rs
index e15f279..b0a103a 100755
--- a/usbh/src/lib.rs
+++ b/usbh/src/lib.rs
@@ -38,9 +38,9 @@ enum DetachedState {
 
 #[derive(Clone, Copy, Debug, PartialEq)]
 enum AttachedState {
-    WaitForSettle,
+    WaitForSettle(usize),
     WaitResetComplete,
-    WaitSOF,
+    WaitSOF(usize),
 }
 
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -73,7 +73,6 @@ where
 
     events: EventReader,
     task_state: TaskState,
-    delay: usize,
 
     // Need chunk of RAM for USB pipes, which gets used with DESCADD
     // register.
@@ -113,7 +112,6 @@ where
 
             events: eventr,
             task_state: TaskState::Detached(DetachedState::Initialize),
-            delay: 0,
 
             pipe_table: PipeTable::new(),
 
@@ -216,8 +214,9 @@ where
             }
             Event::Attached => {
                 if let TaskState::Detached(_) = self.task_state {
-                    self.delay = (self.millis)() + SETTLE_DELAY;
-                    TaskState::Attached(AttachedState::WaitForSettle)
+                    TaskState::Attached(AttachedState::WaitForSettle(
+                        (self.millis)() + SETTLE_DELAY,
+                    ))
                 } else {
                     self.task_state
                 }
@@ -303,8 +302,8 @@ where
 
     fn attached_fsm(&mut self, s: AttachedState) {
         match s {
-            AttachedState::WaitForSettle => {
-                if (self.millis)() >= self.delay {
+            AttachedState::WaitForSettle(until) => {
+                if (self.millis)() >= until {
                     self.usb.host().ctrlb.modify(|_, w| w.busreset().set_bit());
                     self.task_state = TaskState::Attached(AttachedState::WaitResetComplete);
                 }
@@ -322,15 +321,15 @@ where
                     // immediately after reset according to §32.6.3.3.
                     self.usb.host().ctrlb.modify(|_, w| w.sofe().set_bit());
                     // USB spec requires 20ms of SOF after bus reset.
-                    self.delay = (self.millis)() + 20;
-                    self.task_state = TaskState::Attached(AttachedState::WaitSOF);
+                    self.task_state =
+                        TaskState::Attached(AttachedState::WaitSOF((self.millis)() + 20));
                 }
             }
 
-            AttachedState::WaitSOF => {
+            AttachedState::WaitSOF(until) => {
                 if self.usb.host().intflag.read().hsof().bit_is_set() {
                     self.usb.host().intflag.write(|w| w.hsof().set_bit());
-                    if (self.millis)() >= self.delay {
+                    if (self.millis)() >= until {
                         self.task_state = TaskState::Steady(SteadyState::Configuring);
                     }
                 }
-- 
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