From 5ad725fc538ad4be4d63c02392f1fd65d0a60fe4 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Thu, 25 Jul 2019 16:51:44 -0400
Subject: Read entire buffers during IN transfers.

---
 usbh/src/pipe.rs | 59 ++++++++++++++++++++++++++++++--------------------------
 1 file changed, 32 insertions(+), 27 deletions(-)

diff --git a/usbh/src/pipe.rs b/usbh/src/pipe.rs
index e84b898..d880d7a 100644
--- a/usbh/src/pipe.rs
+++ b/usbh/src/pipe.rs
@@ -101,19 +101,14 @@ impl Pipe<'_, '_> {
 
         info!("p{}: sending {:?}", self.num, buf);
 
-        // Equiv to UHD_Pipe_Write(epAddr: 0, sizeof(setup_packet), &setup_packet)
         self.desc
             .bank0
             .addr
             .write(|w| unsafe { w.addr().bits(buf.ptr as u32) });
         // configure packet size PCKSIZE.SIZE
         self.desc.bank0.pcksize.write(|w| {
-            // FIXME: write raw to pcksize, because byte_count offset
-            // may be off? Doc table shows 6 bits, but text says 14,
-            // and arduino shows 14.
-            unsafe { w.bits(buf.len as u32) }
-            //unsafe { w.byte_count().bits(buf.len as u8) };
-            //unsafe { w.multi_packet_size().bits(0) }
+            unsafe { w.byte_count().bits(buf.len as u16) };
+            unsafe { w.multi_packet_size().bits(0) }
         });
 
         self.dispatch_retries(token, nak_limit, millis)
@@ -131,29 +126,39 @@ impl Pipe<'_, '_> {
         assert!(buf.len < 16_384);
 
         info!("p{}: Should IN for {}b.", self.num, buf.len);
-        // TODO: should just pass pipe and pregs in, probably.  TODO:
-        // merge with stuff in `send_to_pipe` that also does this.
-        self.desc
-            .bank0
-            .addr
-            .write(|w| unsafe { w.addr().bits(buf.ptr as u32) });
         self.desc.bank0.pcksize.write(|w| {
-            // FIXME: see note in `send`.
-            unsafe { w.bits(buf.len as u32) }
-            //unsafe { w.byte_count().bits(buf.len as u8) };
-            //unsafe { w.multi_packet_size().bits(0) }
+            unsafe { w.byte_count().bits(buf.len as u16) };
+            unsafe { w.multi_packet_size().bits(0) }
         });
 
-        // Possibly set PSTATUS.DTGL? Not sure how this works
-        // yet. Arduino would set it here if dispatchPkt returned USB_ERROR_DATATOGGLE
-        //pregs.statusset.write(|w| w.dtgl().set_bit());
-        //pregs.statusclr.write(|w| unsafe {
-        // No function for this. FIXME: need to patch the SVD for
-        // PSTATUSCLR.DTGL at bit0
-        // w.bits(1)
-        //});
-
-        self.dispatch_retries(USBToken::In, nak_limit, millis)
+        let mut bytes_received = 0;
+        while bytes_received < buf.len {
+            // Update buffer pointer.
+            //
+            // FIXME: This only works when the packet size is a word
+            // multiple, since `addr` requires word-aligned pointers.
+            self.desc
+                .bank0
+                .addr
+                .write(|w| unsafe { w.addr().bits(buf.ptr as u32 + bytes_received as u32) });
+            self.regs.statusclr.write(|w| w.bk0rdy().set_bit());
+
+            self.dispatch_retries(USBToken::In, nak_limit, millis)?;
+            bytes_received += self.desc.bank0.pcksize.read().byte_count().bits() as usize;
+            assert!(bytes_received <= buf.len);
+            info!("!! read {} of {}", bytes_received, buf.len);
+        }
+        self.regs.statusset.write(|w| w.pfreeze().set_bit());
+
+        if self.regs.status.read().dtgl().bit_is_set() {
+            self.regs.statusset.write(|w| w.dtgl().set_bit());
+        } else {
+            self.regs.statusclr.write(|w| unsafe {
+                // No function for this. FIXME: need to patch the SVD for PSTATUSCLR.DTGL at bit0
+                w.bits(1)
+            });
+        }
+        Ok(())
     }
 
     pub(crate) fn dispatch_retries(
-- 
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