From 93ed653e57fb9947feadf43d36442658e00d4339 Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Tue, 12 Jun 2012 14:03:33 +0000
Subject: [PATCH] STM32F4 USB driver.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4272 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/platforms/STM32/OTGv1/usb_lld.c | 17 ++++++++---------
 readme.txt                             |  6 ++++++
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/os/hal/platforms/STM32/OTGv1/usb_lld.c b/os/hal/platforms/STM32/OTGv1/usb_lld.c
index 03fadadd9..33cb571ec 100644
--- a/os/hal/platforms/STM32/OTGv1/usb_lld.c
+++ b/os/hal/platforms/STM32/OTGv1/usb_lld.c
@@ -256,7 +256,7 @@ static void otg_fifo_write_from_queue(usbep_t ep,
   chSysLockFromIsr();
   oqp->q_rdptr += n;
   if (oqp->q_rdptr >= oqp->q_top)
-    oqp->q_rdptr = oqp->q_buffer;
+    oqp->q_rdptr -= chQSizeI(oqp);
   oqp->q_counter += n;
   while (notempty(&oqp->q_waiting))
     chSchReadyI(fifo_remove(&oqp->q_waiting))->p_u.rdymsg = Q_OK;
@@ -334,9 +334,6 @@ static void otg_fifo_read_to_queue(InputQueue *iqp, size_t n) {
 
   /* Updating queue.*/
   chSysLockFromIsr();
-  iqp->q_wrptr += n;
-  if (iqp->q_wrptr >= iqp->q_top)
-    iqp->q_wrptr = iqp->q_buffer;
   iqp->q_counter += n;
   while (notempty(&iqp->q_waiting))
     chSchReadyI(fifo_remove(&iqp->q_waiting))->p_u.rdymsg = Q_OK;
@@ -416,6 +413,10 @@ static void otg_txfifo_handler(USBDriver *usbp, usbep_t ep) {
     usbp->epc[ep]->in_state->mode.linear.txbuf += n;
   }
   usbp->epc[ep]->in_state->txcnt += n;
+
+  /* Interrupt disabled on transaction end.*/
+  if (usbp->epc[ep]->in_state->txcnt >= usbp->epc[ep]->in_state->txsize)
+    OTG->DIEPEMPMSK &= ~DIEPEMPMSK_INEPTXFEM(ep);
 }
 
 /**
@@ -429,19 +430,17 @@ static void otg_txfifo_handler(USBDriver *usbp, usbep_t ep) {
 static void otg_epin_handler(USBDriver *usbp, usbep_t ep) {
   uint32_t epint = OTG->ie[ep].DIEPINT;
 
+  OTG->ie[ep].DIEPINT = 0xFFFFFFFF;
+
   if (epint & DIEPINT_TOC) {
     /* Timeouts not handled yet, not sure how to handle.*/
-    OTG->ie[ep].DIEPINT = DIEPINT_TOC;
   }
   if (epint & DIEPINT_XFRC) {
     /* Transmit transfer complete.*/
-    OTG->ie[ep].DIEPINT = DIEPINT_XFRC;
     _usb_isr_invoke_in_cb(usbp, ep);
-    OTG->DIEPEMPMSK &= ~DIEPEMPMSK_INEPTXFEM(ep);
   }
-  else if (epint & DIEPINT_TXFE) {
+  if ((epint & DIEPINT_TXFE) && (OTG->DIEPEMPMSK & DIEPEMPMSK_INEPTXFEM(ep))) {
     /* TX FIFO empty or emptying.*/
-    OTG->ie[ep].DIEPINT = DIEPINT_TXFE;
     otg_txfifo_handler(usbp, ep);
   }
 }
diff --git a/readme.txt b/readme.txt
index 33f5f152e..588b39d15 100644
--- a/readme.txt
+++ b/readme.txt
@@ -144,6 +144,12 @@
   3484947)(backported to 2.4.1).
 - FIX: Fixed various minor documentation errors (bug 3484942)(backported
   to 2.4.1).
+- NEW: USB implementation for STM32F105/F107/2xx/F4xx devices.
+  TODO: Modify the F103 USB driver for the new model.
+- NEW: Improved SerialUSB driver using the new queued mode, much smaller
+  than the previous driver.
+- NEW: Improved USB driver model supporting also queues for endpoint I/O,
+  packet mode removed.
 - NEW: Added an application-defined field to I/O queues (a void pointer).
 - NEW: Added board files for Maple Mini STM32F103, contributed by Wagner
   Sartori Junior.